dungeon_editor_v2.cc

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// Related header
#include "dungeon_editor_v2.h"
 
// C system headers
#include <cstdio>
 
// C++ standard library headers
#include <algorithm>
#include <iterator>
#include <memory>
#include <string>
#include <utility>
#include <vector>
 
// Third-party library headers
#include "absl/status/status.h"
#include "absl/strings/str_format.h"
#include "absl/types/span.h"
#include "imgui/imgui.h"
 
// Project headers
#include "app/editor/agent/agent_ui_theme.h"
#include "app/editor/dungeon/dungeon_canvas_viewer.h"
#include "app/editor/dungeon/dungeon_room_store.h"
#include "app/editor/dungeon/inspectors/door_editor_content.h"
#include "app/editor/dungeon/inspectors/object_editor_content.h"
#include "app/editor/dungeon/inspectors/palette_editor_content.h"
#include "app/editor/dungeon/ui/window/custom_collision_panel.h"
#include "app/editor/dungeon/ui/window/dungeon_entrance_list_panel.h"
#include "app/editor/dungeon/ui/window/dungeon_entrances_panel.h"
#include "app/editor/dungeon/ui/window/dungeon_map_panel.h"
#include "app/editor/dungeon/ui/window/dungeon_settings_panel.h"
#include "app/editor/dungeon/ui/window/item_editor_panel.h"
#include "app/editor/dungeon/ui/window/minecart_track_editor_panel.h"
#include "app/editor/dungeon/ui/window/object_tile_editor_panel.h"
#include "app/editor/dungeon/ui/window/overlay_manager_panel.h"
#include "app/editor/dungeon/ui/window/room_tag_editor_panel.h"
#include "app/editor/dungeon/ui/window/sprite_editor_panel.h"
#include "app/editor/dungeon/ui/window/water_fill_panel.h"
#include "app/editor/dungeon/selectors/object_selector_content.h"
#include "app/editor/dungeon/workspace/dungeon_workbench_content.h"
#include "app/editor/dungeon/workspace/room_browser_content.h"
#include "app/editor/dungeon/workspace/room_graphics_content.h"
#include "app/editor/dungeon/workspace/room_matrix_content.h"
#include "app/editor/editor_manager.h"
#include "app/editor/graphics/graphics_editor.h"
#include "app/editor/events/core_events.h"
#include "app/editor/menu/status_bar.h"
#include "app/editor/system/session/hack_manifest_save_validation.h"
#include "app/editor/system/workspace/workspace_window_manager.h"
#include "app/editor/shell/feedback/toast_manager.h"
#include "app/emu/mesen/mesen_client_registry.h"
#include "app/emu/mesen/mesen_socket_client.h"
#include "app/emu/render/emulator_render_service.h"
#include "app/gfx/backend/irenderer.h"
#include "app/gfx/resource/arena.h"
#include "app/gfx/types/snes_palette.h"
#include "app/gfx/types/snes_tile.h"
#include "app/gfx/util/palette_manager.h"
#include "app/gui/core/icons.h"
#include "core/features.h"
#include "core/project.h"
#include "rom/snes.h"
#include "util/log.h"
#include "util/macro.h"
#include "zelda3/dungeon/custom_object.h"
#include "zelda3/dungeon/dungeon_editor_system.h"
#include "zelda3/dungeon/dungeon_rom_addresses.h"
#include "zelda3/dungeon/dungeon_validator.h"
#include "zelda3/dungeon/object_dimensions.h"
#include "zelda3/dungeon/room.h"
#include "zelda3/dungeon/water_fill_zone.h"
#include "zelda3/resource_labels.h"
 
namespace yaze::editor {
 
namespace {
 
absl::Status SaveWaterFillZones(Rom* rom, DungeonRoomStore& rooms) {
  if (!rom || !rom->is_loaded()) {
    return absl::FailedPreconditionError("ROM not loaded");
  }
 
  bool any_dirty = false;
  rooms.ForEachMaterialized([&any_dirty](int, const zelda3::Room& room) {
    if (room.water_fill_dirty()) {
      any_dirty = true;
    }
  });
  if (!any_dirty) {
    return absl::OkStatus();
  }
 
  std::vector<zelda3::WaterFillZoneEntry> zones;
  zones.reserve(8);
  for (int room_id = 0; room_id < static_cast<int>(rooms.size()); ++room_id) {
    auto* room = rooms.GetIfMaterialized(room_id);
    if (room == nullptr) {
      continue;
    }
    if (!room->has_water_fill_zone()) {
      continue;
    }
 
    const int tile_count = room->WaterFillTileCount();
    if (tile_count <= 0) {
      continue;
    }
    if (tile_count > 255) {
      return absl::InvalidArgumentError(absl::StrFormat(
          "Water fill zone in room 0x%02X has %d tiles (max 255)", room_id,
          tile_count));
    }
 
    zelda3::WaterFillZoneEntry z;
    z.room_id = room_id;
    z.sram_bit_mask = room->water_fill_sram_bit_mask();
    z.fill_offsets.reserve(static_cast<size_t>(tile_count));
 
    const auto& map = room->water_fill_zone().tiles;
    for (size_t i = 0; i < map.size(); ++i) {
      if (map[i] != 0) {
        z.fill_offsets.push_back(static_cast<uint16_t>(i));
      }
    }
    zones.push_back(std::move(z));
  }
 
  if (zones.size() > 8) {
    return absl::InvalidArgumentError(absl::StrFormat(
        "Too many water fill zones: %zu (max 8 fits in $7EF411 bitfield)",
        zones.size()));
  }
 
  // Canonicalize SRAM mask assignment using the shared normalizer so editor
  // save behavior matches JSON import/export workflows.
  RETURN_IF_ERROR(zelda3::NormalizeWaterFillZoneMasks(&zones));
  for (const auto& z : zones) {
    if (auto* room = rooms.GetIfMaterialized(z.room_id)) {
      room->set_water_fill_sram_bit_mask(z.sram_bit_mask);
    }
  }
 
  RETURN_IF_ERROR(zelda3::WriteWaterFillTable(rom, zones));
  rooms.ForEachMaterialized(
      [](int, zelda3::Room& room) { room.ClearWaterFillDirty(); });
 
  return absl::OkStatus();
}
 
}  // namespace
 
DungeonEditorV2::~DungeonEditorV2() {
  // Clear viewer references in panels BEFORE room_viewers_ is destroyed.
  // Panels are owned by WorkspaceWindowManager and outlive this editor, so they need
  // to have their viewer pointers cleared to prevent dangling pointer access.
  if (object_selector_panel_) {
    object_selector_panel_->SetCanvasViewer(nullptr);
  }
  if (object_editor_content_) {
    object_editor_content_->SetCanvasViewer(nullptr);
  }
  if (door_editor_panel_) {
    door_editor_panel_->SetCanvasViewer(nullptr);
  }
  if (sprite_editor_panel_) {
    sprite_editor_panel_->SetCanvasViewer(nullptr);
  }
  if (item_editor_panel_) {
    item_editor_panel_->SetCanvasViewer(nullptr);
  }
  if (custom_collision_panel_) {
    custom_collision_panel_->SetCanvasViewer(nullptr);
    custom_collision_panel_->SetInteraction(nullptr);
  }
  if (water_fill_panel_) {
    water_fill_panel_->SetCanvasViewer(nullptr);
    water_fill_panel_->SetInteraction(nullptr);
  }
  if (dungeon_settings_panel_) {
    dungeon_settings_panel_->SetCanvasViewer(nullptr);
  }
}
 
void DungeonEditorV2::Initialize() {
  if (dependencies_.renderer) {
    renderer_ = dependencies_.renderer;
  }
  const bool rom_changed = dependencies_.rom && dependencies_.rom != rom_;
  if (rom_changed) {
    SetRom(dependencies_.rom);
    // The system owns ROM-backed views; ensure it matches the current ROM.
    dungeon_editor_system_.reset();
  }
  if (rom_ && !dungeon_editor_system_) {
    dungeon_editor_system_ = zelda3::CreateDungeonEditorSystem(rom_);
    if (game_data_) {
      dungeon_editor_system_->SetGameData(game_data_);
    }
  }
 
  // Setup docking class for room windows
  room_window_class_.DockingAllowUnclassed = true;
  room_window_class_.DockingAlwaysTabBar = true;
 
  if (!dependencies_.window_manager)
    return;
  auto* window_manager = dependencies_.window_manager;
 
  // Legacy panel IDs persisted in older layouts/settings.
  window_manager->RegisterPanelAlias("dungeon.object_tools",
                                     kObjectSelectorId);
  window_manager->RegisterPanelAlias("dungeon.entrances",
                                     "dungeon.entrance_properties");
 
  // Register panels with WorkspaceWindowManager (no boolean flags - visibility is
  // managed entirely by WorkspaceWindowManager::ShowPanel/HidePanel/IsPanelVisible)
  window_manager->RegisterPanel(
      {.card_id = "dungeon.workbench",
       .display_name = "Dungeon Workbench",
       .window_title = " Dungeon Workbench",
       .icon = ICON_MD_WORKSPACES,
       .category = "Dungeon",
       .shortcut_hint = "Ctrl+Shift+W",
       .visibility_flag = nullptr,
       .priority = 5,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to edit dungeon rooms"});
 
  window_manager->RegisterPanel(
      {.card_id = kRoomSelectorId,
       .display_name = "Room List",
       .window_title = " Room List",
       .icon = ICON_MD_LIST,
       .category = "Dungeon",
       .shortcut_hint = "Ctrl+Shift+R",
       .visibility_flag = nullptr,
       .priority = 20,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to browse dungeon rooms"});
 
  window_manager->RegisterPanel(
      {.card_id = kEntranceListId,
       .display_name = "Entrance List",
       .window_title = " Entrance List",
       .icon = ICON_MD_DOOR_FRONT,
       .category = "Dungeon",
       .shortcut_hint = "Ctrl+Shift+E",
       .visibility_flag = nullptr,
       .priority = 25,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to browse dungeon entrances"});
 
  window_manager->RegisterPanel(
      {.card_id = "dungeon.entrance_properties",
       .display_name = "Entrance Properties",
       .window_title = " Entrance Properties",
       .icon = ICON_MD_TUNE,
       .category = "Dungeon",
       .shortcut_hint = "",
       .visibility_flag = nullptr,
       .priority = 26,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to edit entrance properties"});
 
  window_manager->RegisterPanel(
      {.card_id = kRoomMatrixId,
       .display_name = "Room Matrix",
       .window_title = " Room Matrix",
       .icon = ICON_MD_GRID_VIEW,
       .category = "Dungeon",
       .shortcut_hint = "Ctrl+Shift+M",
       .visibility_flag = nullptr,
       .priority = 30,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to view the room matrix"});
 
  window_manager->RegisterPanel(
      {.card_id = kRoomGraphicsId,
       .display_name = "Room Graphics",
       .window_title = " Room Graphics",
       .icon = ICON_MD_IMAGE,
       .category = "Dungeon",
       .shortcut_hint = "Ctrl+Shift+G",
       .visibility_flag = nullptr,
       .priority = 50,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to view room graphics"});
 
  window_manager->RegisterPanel(
      {.card_id = kObjectSelectorId,
       .display_name = "Object Selector",
       .window_title = " Object Selector",
       .icon = ICON_MD_CATEGORY,
       .category = "Dungeon",
       .shortcut_hint = "",
       .visibility_flag = nullptr,
       .priority = 60,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to browse dungeon objects"});
 
  window_manager->RegisterPanel(
      {.card_id = kObjectEditorId,
       .display_name = "Object Editor",
       .window_title = " Object Editor",
       .icon = ICON_MD_TUNE,
       .category = "Dungeon",
       .shortcut_hint = "",
       .visibility_flag = nullptr,
       .priority = 61,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to edit selected dungeon objects"});
 
  window_manager->RegisterPanel(
      {.card_id = kDoorEditorId,
       .display_name = "Door Editor",
       .window_title = " Door Editor",
       .icon = ICON_MD_DOOR_FRONT,
       .category = "Dungeon",
       .shortcut_hint = "",
       .visibility_flag = nullptr,
       .priority = 69,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to edit dungeon doors"});
 
  window_manager->RegisterPanel(
      {.card_id = kPaletteEditorId,
       .display_name = "Palette Editor",
       .window_title = " Palette Editor",
       .icon = ICON_MD_PALETTE,
       .category = "Dungeon",
       // Avoid conflicting with the global Command Palette (Ctrl/Cmd+Shift+P).
       .shortcut_hint = "Ctrl+Shift+Alt+P",
       .visibility_flag = nullptr,
       .priority = 70,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to edit dungeon palettes"});
 
  window_manager->RegisterPanel(
      {.card_id = "dungeon.room_tags",
       .display_name = "Room Tags",
       .window_title = " Room Tags",
       .icon = ICON_MD_LABEL,
       .category = "Dungeon",
       .shortcut_hint = "",
       .visibility_flag = nullptr,
       .priority = 45,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to view room tags"});
 
  window_manager->RegisterPanel(
      {.card_id = "dungeon.dungeon_map",
       .display_name = "Dungeon Map",
       .window_title = " Dungeon Map",
       .icon = ICON_MD_MAP,
       .category = "Dungeon",
       .shortcut_hint = "Ctrl+Shift+D",
       .visibility_flag = nullptr,
       .priority = 32,
       .enabled_condition = [this]() { return rom_ && rom_->is_loaded(); },
       .disabled_tooltip = "Load a ROM to view the dungeon map"});
 
  // Show default panels on startup.
  // Workbench mode intentionally suppresses parallel standalone defaults to
  // avoid two competing workflows being open at once.
  SetWorkbenchWorkflowMode(core::FeatureFlags::get().dungeon.kUseWorkbench,
                           /*show_toast=*/false);
 
  // Wire intent-aware callback for double-click / context menu
  room_selector_.SetRoomSelectedWithIntentCallback(
      [this](int room_id, RoomSelectionIntent intent) {
        OnRoomSelected(room_id, intent);
      });
 
  // Register WindowContent instances
  window_manager->RegisterWindowContent(
      std::make_unique<RoomBrowserContent>(
          &room_selector_, [this](int room_id) { OnRoomSelected(room_id); }));
 
  window_manager->RegisterWindowContent(
      std::make_unique<DungeonEntranceListPanel>(
          &room_selector_,
          [this](int entrance_id) { OnEntranceSelected(entrance_id); }));
 
  {
    auto matrix_panel = std::make_unique<RoomMatrixContent>(
        &current_room_id_, &active_rooms_,
        [this](int room_id) { OnRoomSelected(room_id); },
        [this](int old_room, int new_room) {
          SwapRoomInPanel(old_room, new_room);
        },
        &rooms_);
    matrix_panel->SetRoomIntentCallback(
        [this](int room_id, RoomSelectionIntent intent) {
          OnRoomSelected(room_id, intent);
        });
    window_manager->RegisterWindowContent(std::move(matrix_panel));
  }
 
  {
    auto dungeon_map = std::make_unique<DungeonMapPanel>(
        &current_room_id_, &active_rooms_,
        [this](int room_id) { OnRoomSelected(room_id); }, &rooms_);
    dungeon_map->SetRoomIntentCallback(
        [this](int room_id, RoomSelectionIntent intent) {
          OnRoomSelected(room_id, intent);
        });
    if (dependencies_.project) {
      dungeon_map->SetHackManifest(&dependencies_.project->hack_manifest);
    }
    window_manager->RegisterWindowContent(std::move(dungeon_map));
  }
 
  {
    auto workbench = std::make_unique<DungeonWorkbenchContent>(
        &room_selector_, &current_room_id_,
        [this](int room_id) { OnRoomSelected(room_id); },
        [this](int room_id, RoomSelectionIntent intent) {
          OnRoomSelected(room_id, intent);
        },
        [this](int room_id) {
          auto status = SaveRoom(room_id);
          if (!status.ok()) {
            LOG_ERROR("DungeonEditorV2", "Save Room failed: %s",
                      status.message().data());
            if (dependencies_.toast_manager) {
              dependencies_.toast_manager->Show(
                  absl::StrFormat("Save Room failed: %s", status.message()),
                  ToastType::kError);
            }
            return;
          }
          if (dependencies_.toast_manager) {
            dependencies_.toast_manager->Show("Room saved",
                                              ToastType::kSuccess);
          }
        },
        [this]() { return GetWorkbenchViewer(); },
        [this]() { return GetWorkbenchCompareViewer(); },
        [this]() -> const std::deque<int>& { return recent_rooms_; },
        [this](int room_id) {
          recent_rooms_.erase(
              std::remove(recent_rooms_.begin(), recent_rooms_.end(), room_id),
              recent_rooms_.end());
        },
        [this](const std::string& id) { OpenWindow(id); },
        [this](bool enabled) { QueueWorkbenchWorkflowMode(enabled); }, rom_);
    workbench_panel_ = workbench.get();
    workbench_panel_->SetUndoRedoProvider(
        [this]() { return undo_manager_.CanUndo(); },
        [this]() { return undo_manager_.CanRedo(); },
        [this]() { Undo().IgnoreError(); }, [this]() { Redo().IgnoreError(); },
        [this]() { return undo_manager_.GetUndoDescription(); },
        [this]() { return undo_manager_.GetRedoDescription(); },
        [this]() { return static_cast<int>(undo_manager_.UndoStackSize()); });
    window_manager->RegisterWindowContent(std::move(workbench));
  }
 
  window_manager->RegisterWindowContent(std::make_unique<DungeonEntrancesPanel>(
      &entrances_, &current_entrance_id_,
      [this](int entrance_id) { OnEntranceSelected(entrance_id); }));
 
  // Note: RoomGraphicsContent and PaletteEditorContent are registered
  // in Load() after their dependencies (renderer_, palette_editor_) are initialized
}
 
absl::Status DungeonEditorV2::Load() {
  if (!rom_ || !rom_->is_loaded()) {
    return absl::FailedPreconditionError("ROM not loaded");
  }
 
  // Initialize ObjectDimensionTable so DimensionService's fallback path works.
  // DimensionService::Get() queries this table internally but has no Load API.
  auto& dim_table = zelda3::ObjectDimensionTable::Get();
  if (!dim_table.IsLoaded()) {
    RETURN_IF_ERROR(dim_table.LoadFromRom(rom_));
  }
 
  RETURN_IF_ERROR(room_loader_.LoadRoomEntrances(entrances_));
 
  if (!game_data()) {
    return absl::FailedPreconditionError("GameData not available");
  }
  auto dungeon_main_pal_group = game_data()->palette_groups.dungeon_main;
  current_palette_ = dungeon_main_pal_group[current_palette_group_id_];
  ASSIGN_OR_RETURN(current_palette_group_,
                   gfx::CreatePaletteGroupFromLargePalette(current_palette_));
 
  room_selector_.set_rooms(&rooms_);
  room_selector_.set_entrances(&entrances_);
  room_selector_.set_active_rooms(active_rooms_);
  room_selector_.SetRoomSelectedCallback(
      [this](int room_id) { OnRoomSelected(room_id); });
  room_selector_.SetRoomSelectedWithIntentCallback(
      [this](int room_id, RoomSelectionIntent intent) {
        OnRoomSelected(room_id, intent);
      });
 
  // Canvas viewers are lazily created in GetViewerForRoom
 
  if (game_data()) {
    gfx::PaletteManager::Get().Initialize(game_data());
  } else {
    gfx::PaletteManager::Get().Initialize(rom_);
  }
 
  palette_editor_.Initialize(game_data());
  palette_editor_.SetDungeonRenderPaletteMode(true);
 
  // Register panels that depend on initialized state (renderer, palette_editor_)
  if (dependencies_.window_manager) {
    auto graphics_panel = std::make_unique<RoomGraphicsContent>(
        &current_room_id_, &rooms_, renderer_);
    room_graphics_panel_ = graphics_panel.get();
    dependencies_.window_manager->RegisterWindowContent(
        std::move(graphics_panel));
    dependencies_.window_manager->RegisterWindowContent(
        std::make_unique<PaletteEditorContent>(&palette_editor_));
  }
 
  dungeon_editor_system_ = std::make_unique<zelda3::DungeonEditorSystem>(rom_);
  (void)dungeon_editor_system_->Initialize();
  dungeon_editor_system_->SetCurrentRoom(current_room_id_);
 
  // Initialize browse-only object selector and the dedicated object editor.
  auto object_selector = std::make_unique<ObjectSelectorContent>(
      renderer_, rom_, nullptr, dungeon_editor_system_->GetObjectEditor());
  auto object_editor =
      std::make_unique<ObjectEditorContent>(dungeon_editor_system_->GetObjectEditor());
 
  // Wire up object change callback to trigger room re-rendering
  dungeon_editor_system_->GetObjectEditor()->SetObjectChangedCallback(
      [this](size_t /*object_index*/, const zelda3::RoomObject& /*object*/) {
        if (current_room_id_ >= 0 && current_room_id_ < (int)rooms_.size()) {
          rooms_[current_room_id_].RenderRoomGraphics();
        }
      });
 
  // Set rooms and initial palette group for correct preview rendering
  object_selector->SetRooms(&rooms_);
  object_selector->SetCurrentPaletteGroup(current_palette_group_);
 
  object_selector->SetOpenObjectEditorCallback(
      [this]() { OpenWindow(kObjectEditorId); });
 
  // Keep raw pointers for later access
  object_selector_panel_ = object_selector.get();
  object_editor_content_ = object_editor.get();
 
  auto door_editor = std::make_unique<DoorEditorContent>();
  door_editor->SetRooms(&rooms_);
  door_editor_panel_ = door_editor.get();
 
  // Propagate game_data to the object editor panel if available
  if (game_data()) {
    object_selector_panel_->SetGameData(game_data());
  }
  if (dependencies_.project) {
    object_selector_panel_->object_selector().SetCustomObjectsFolder(
        dependencies_.project->GetAbsolutePath(
            dependencies_.project->custom_objects_folder));
  }
 
  // Wire tile editor callback before transferring ownership
  object_selector->set_tile_editor_callback([this](int16_t object_id) {
    if (object_tile_editor_panel_) {
      object_tile_editor_panel_->OpenForObject(object_id, current_room_id_,
                                               &rooms_);
      OpenWindow("dungeon.object_tile_editor");
    }
  });
 
  // Register the ObjectSelectorContent directly (it inherits from WindowContent)
  // Panel manager takes ownership
  if (dependencies_.window_manager) {
    dependencies_.window_manager->RegisterWindowContent(
        std::move(object_selector));
    dependencies_.window_manager->RegisterWindowContent(
        std::move(object_editor));
    dependencies_.window_manager->RegisterWindowContent(std::move(door_editor));
 
    // Register sprite and item editor panels with canvas viewer = nullptr
    // They will get the viewer reference in OnRoomSelected when a room is selected
    auto sprite_panel = std::make_unique<SpriteEditorPanel>(&current_room_id_,
                                                            &rooms_, nullptr);
    sprite_editor_panel_ = sprite_panel.get();
    dependencies_.window_manager->RegisterWindowContent(
        std::move(sprite_panel));
 
    auto item_panel =
        std::make_unique<ItemEditorPanel>(&current_room_id_, &rooms_, nullptr);
    item_editor_panel_ = item_panel.get();
    dependencies_.window_manager->RegisterWindowContent(std::move(item_panel));
 
    auto collision_panel = std::make_unique<CustomCollisionPanel>(
        nullptr, nullptr);  // Placeholder, will be set in OnRoomSelected
    custom_collision_panel_ = collision_panel.get();
    dependencies_.window_manager->RegisterWindowContent(
        std::move(collision_panel));
 
    auto water_fill_panel =
        std::make_unique<WaterFillPanel>(nullptr, nullptr);  // Placeholder
    water_fill_panel_ = water_fill_panel.get();
    dependencies_.window_manager->RegisterWindowContent(
        std::move(water_fill_panel));
 
    // Object Tile Editor Panel
    {
      auto tile_editor_panel =
          std::make_unique<ObjectTileEditorPanel>(renderer_, rom_);
      tile_editor_panel->SetCurrentPaletteGroup(current_palette_group_);
 
      // Wire creation callback: when a new custom object is saved,
      // register it with the manager, persist to project, and refresh UI.
      tile_editor_panel->SetObjectCreatedCallback(
          [this](int object_id, const std::string& filename) {
            zelda3::CustomObjectManager::Get().AddObjectFile(object_id,
                                                             filename);
            if (dependencies_.project) {
              dependencies_.project->custom_object_files[object_id].push_back(
                  filename);
              (void)dependencies_.project->Save();
            }
            if (object_selector_panel_) {
              object_selector_panel_->object_selector().InvalidatePreviewCache();
            }
          });
 
      object_tile_editor_panel_ = tile_editor_panel.get();
      dependencies_.window_manager->RegisterWindowContent(
          std::move(tile_editor_panel));
    }
 
    // Wire tile editor panel and project references to the object selector
    if (object_selector_panel_) {
      object_selector_panel_->object_selector().SetTileEditorPanel(
          object_tile_editor_panel_);
      if (dependencies_.project) {
        object_selector_panel_->object_selector().SetProject(
            dependencies_.project);
      }
    }
 
    auto settings_panel = std::make_unique<DungeonSettingsPanel>(nullptr);
    settings_panel->SetSaveRoomCallback([this](int id) { SaveRoom(id); });
    settings_panel->SetSaveAllRoomsCallback([this]() { SaveAllRooms(); });
    settings_panel->SetCurrentRoomId(&current_room_id_);
    dungeon_settings_panel_ = settings_panel.get();
    dependencies_.window_manager->RegisterWindowContent(
        std::move(settings_panel));
 
    // Room Tag Editor Panel
    {
      auto room_tag_panel = std::make_unique<RoomTagEditorPanel>();
      room_tag_panel->SetProject(dependencies_.project);
      room_tag_panel->SetRooms(&rooms_);
      room_tag_panel->SetCurrentRoomId(current_room_id_);
      room_tag_editor_panel_ = room_tag_panel.get();
      dependencies_.window_manager->RegisterWindowContent(
          std::move(room_tag_panel));
    }
 
    // Overlay Manager Panel
    {
      auto overlay_panel = std::make_unique<OverlayManagerPanel>();
      overlay_manager_panel_ = overlay_panel.get();
      dependencies_.window_manager->RegisterWindowContent(
          std::move(overlay_panel));
    }
 
    // Feature Flag: Custom Objects / Minecart Tracks
    if (core::FeatureFlags::get().kEnableCustomObjects) {
      if (!minecart_track_editor_panel_) {
        auto minecart_panel = std::make_unique<MinecartTrackEditorPanel>();
        minecart_track_editor_panel_ = minecart_panel.get();
        dependencies_.window_manager->RegisterWindowContent(
            std::move(minecart_panel));
      }
 
      if (dependencies_.project) {
        // Update project root for track editor
        if (minecart_track_editor_panel_) {
          minecart_track_editor_panel_->SetProjectRoot(
              dependencies_.project->code_folder);
          minecart_track_editor_panel_->SetRooms(&rooms_);
          minecart_track_editor_panel_->SetRom(rom_);
          minecart_track_editor_panel_->SetProject(dependencies_.project);
          minecart_track_editor_panel_->SetRoomNavigationCallback(
              [this](int room_id) { OnRoomSelected(room_id); });
        }
 
        // Initialize custom object manager with project-configured path
        if (!dependencies_.project->custom_objects_folder.empty()) {
          zelda3::CustomObjectManager::Get().Initialize(
              dependencies_.project->GetAbsolutePath(
                  dependencies_.project->custom_objects_folder));
        } else {
          // Avoid inheriting stale singleton state from previous projects.
          zelda3::CustomObjectManager::Get().Initialize("");
        }
      }
    }
  } else {
    owned_object_selector_panel_ = std::move(object_selector);
    owned_object_editor_content_ = std::move(object_editor);
    owned_door_editor_panel_ = std::move(door_editor);
  }
 
  palette_editor_.SetOnPaletteChanged([this](int /*palette_id*/) {
    auto apply_palette = [this](DungeonCanvasViewer* viewer) {
      if (!viewer) {
        return;
      }
      viewer->SetCurrentPaletteId(current_palette_id_);
      viewer->SetCurrentPaletteGroup(current_palette_group_);
    };
 
    if (current_room_id_ >= 0 && current_room_id_ < (int)rooms_.size() &&
        game_data()) {
      auto& dungeon_main_pal_group = game_data()->palette_groups.dungeon_main;
      if (current_palette_id_ >= 0 &&
          current_palette_id_ < static_cast<int>(dungeon_main_pal_group.size())) {
        current_palette_group_id_ = current_palette_id_;
        current_palette_ = dungeon_main_pal_group[current_palette_id_];
        if (auto pal_group =
                gfx::CreatePaletteGroupFromLargePalette(current_palette_);
            pal_group.ok()) {
          current_palette_group_ = pal_group.value();
          apply_palette(workbench_viewer_.get());
          apply_palette(workbench_compare_viewer_.get());
          if (!IsWorkbenchWorkflowEnabled()) {
            if (auto* existing_viewer = room_viewers_.Get(current_room_id_)) {
              apply_palette(existing_viewer->get());
            }
          }
          if (object_selector_panel_) {
            object_selector_panel_->SetCurrentPaletteGroup(
                current_palette_group_);
          }
          if (room_graphics_panel_) {
            room_graphics_panel_->SetCurrentPaletteGroup(current_palette_group_);
          }
        }
      }
    }
 
    bool rendered_current_room = false;
    for (int i = 0; i < active_rooms_.Size; i++) {
      int room_id = active_rooms_[i];
      if (room_id >= 0 && room_id < (int)rooms_.size()) {
        rooms_[room_id].RenderRoomGraphics();
        rendered_current_room |= room_id == current_room_id_;
      }
    }
 
    if (!rendered_current_room && current_room_id_ >= 0 &&
        current_room_id_ < static_cast<int>(rooms_.size())) {
      rooms_[current_room_id_].RenderRoomGraphics();
    }
  });
 
  // Oracle of Secrets: load editor-authored water fill zones (best-effort).
  {
    rooms_.ForEachMaterialized([](int, zelda3::Room& room) {
      room.ClearWaterFillZone();
      room.ClearWaterFillDirty();
    });
 
    bool legacy_imported = false;
    std::vector<zelda3::WaterFillZoneEntry> zones;
 
    auto zones_or = zelda3::LoadWaterFillTable(rom_);
    if (zones_or.ok()) {
      zones = std::move(zones_or.value());
    } else {
      LOG_WARN("DungeonEditorV2", "WaterFillTable parse failed: %s",
               zones_or.status().message().data());
      if (dependencies_.toast_manager) {
        dependencies_.toast_manager->Show(
            absl::StrFormat("WaterFill table parse failed: %s",
                            zones_or.status().message()),
            ToastType::kWarning);
      }
    }
 
    if (zones.empty()) {
      std::string sym_path;
      if (dependencies_.project &&
          !dependencies_.project->symbols_filename.empty()) {
        sym_path = dependencies_.project->GetAbsolutePath(
            dependencies_.project->symbols_filename);
      }
      auto legacy_or = zelda3::LoadLegacyWaterGateZones(rom_, sym_path);
      if (legacy_or.ok()) {
        zones = std::move(legacy_or.value());
        legacy_imported = !zones.empty();
      } else {
        LOG_WARN("DungeonEditorV2", "Legacy water gate import failed: %s",
                 legacy_or.status().message().data());
      }
    }
 
    for (const auto& z : zones) {
      if (z.room_id < 0 || z.room_id >= static_cast<int>(rooms_.size())) {
        continue;
      }
      auto& room = rooms_[z.room_id];
      room.set_water_fill_sram_bit_mask(z.sram_bit_mask);
      for (uint16_t off : z.fill_offsets) {
        const int x = static_cast<int>(off % 64);
        const int y = static_cast<int>(off / 64);
        room.SetWaterFillTile(x, y, true);
      }
 
      if (!legacy_imported) {
        room.ClearWaterFillDirty();
      }
    }
 
    if (legacy_imported && dependencies_.toast_manager) {
      dependencies_.toast_manager->Show(
          "Imported legacy water gate zones (save to write new table)",
          ToastType::kInfo);
    }
  }
 
  is_loaded_ = true;
  return absl::OkStatus();
}
 
absl::Status DungeonEditorV2::Update() {
  ProcessPendingWorkflowMode();
 
  const auto& theme = AgentUI::GetTheme();
  if (room_window_class_.ClassId == 0) {
    room_window_class_.ClassId = ImGui::GetID("DungeonRoomClass");
  }
 
  if (!is_loaded_) {
    gui::PanelWindow loading_card("Dungeon Editor Loading", ICON_MD_CASTLE);
    loading_card.SetDefaultSize(400, 200);
    if (loading_card.Begin()) {
      ImGui::TextColored(theme.text_secondary_gray, "Loading dungeon data...");
      ImGui::TextWrapped(
          "Independent editor cards will appear once ROM data is loaded.");
    }
    loading_card.End();
    return absl::OkStatus();
  }
 
  if (!IsWorkbenchWorkflowEnabled() || active_rooms_.Size > 0) {
    DrawRoomPanels();
  }
 
  if (ImGui::IsKeyPressed(ImGuiKey_Delete)) {
    // Delegate delete to current room viewer
    if (auto* viewer = GetViewerForRoom(current_room_id_)) {
      viewer->DeleteSelectedObjects();
    }
  }
 
  // Keyboard Shortcuts (only if not typing in a text field)
  if (!ImGui::GetIO().WantTextInput) {
    if (ImGui::GetIO().KeyCtrl && ImGui::GetIO().KeyShift &&
        ImGui::IsKeyPressed(ImGuiKey_W, false)) {
      ToggleWorkbenchWorkflowMode();
    }
 
    // Room Cycling (Ctrl+Tab)
    if (ImGui::IsKeyPressed(ImGuiKey_Tab) && ImGui::GetIO().KeyCtrl) {
      if (IsWorkbenchWorkflowEnabled()) {
        if (recent_rooms_.size() > 1) {
          int current_idx = -1;
          for (int i = 0; i < static_cast<int>(recent_rooms_.size()); ++i) {
            if (recent_rooms_[i] == current_room_id_) {
              current_idx = i;
              break;
            }
          }
          if (current_idx != -1) {
            int next_idx;
            if (ImGui::GetIO().KeyShift) {
              next_idx =
                  (current_idx + 1) % static_cast<int>(recent_rooms_.size());
            } else {
              next_idx =
                  (current_idx - 1 + static_cast<int>(recent_rooms_.size())) %
                  static_cast<int>(recent_rooms_.size());
            }
            OnRoomSelected(recent_rooms_[next_idx]);
          }
        }
      } else if (active_rooms_.size() > 1) {
        int current_idx = -1;
        for (int i = 0; i < active_rooms_.size(); ++i) {
          if (active_rooms_[i] == current_room_id_) {
            current_idx = i;
            break;
          }
        }
 
        if (current_idx != -1) {
          int next_idx;
          if (ImGui::GetIO().KeyShift) {
            next_idx =
                (current_idx - 1 + active_rooms_.size()) % active_rooms_.size();
          } else {
            next_idx = (current_idx + 1) % active_rooms_.size();
          }
          OnRoomSelected(active_rooms_[next_idx]);
        }
      }
    }
 
    // Adjacent Room Navigation (Ctrl+Arrows)
    if (ImGui::GetIO().KeyCtrl) {
      int next_room = -1;
      const int kCols = 16;
 
      if (ImGui::IsKeyPressed(ImGuiKey_UpArrow)) {
        if (current_room_id_ >= kCols)
          next_room = current_room_id_ - kCols;
      } else if (ImGui::IsKeyPressed(ImGuiKey_DownArrow)) {
        if (IsValidRoomId(current_room_id_ + kCols))
          next_room = current_room_id_ + kCols;
      } else if (ImGui::IsKeyPressed(ImGuiKey_LeftArrow)) {
        if (current_room_id_ % kCols > 0)
          next_room = current_room_id_ - 1;
      } else if (ImGui::IsKeyPressed(ImGuiKey_RightArrow)) {
        if (current_room_id_ % kCols < kCols - 1 &&
            IsValidRoomId(current_room_id_ + 1))
          next_room = current_room_id_ + 1;
      }
 
      if (next_room != -1) {
        if (IsWorkbenchWorkflowEnabled()) {
          OnRoomSelected(next_room, /*request_focus=*/false);
        } else {
          SwapRoomInPanel(current_room_id_, next_room);
        }
      }
    }
  }
 
  // Process any pending room swaps after all drawing is complete
  // This prevents ImGui state corruption from modifying collections mid-frame
  ProcessPendingSwap();
 
  return absl::OkStatus();
}
 
void DungeonEditorV2::ContributeStatus(StatusBar* status_bar) {
  if (!status_bar)
    return;
  const int room_id = current_room_id();
 
  if (room_id >= 0) {
    StatusBarSegmentOptions room_opts;
    room_opts.tooltip = "Click to refocus viewer on this room";
    room_opts.on_click = [this, room_id]() {
      if (dependencies_.global_context) {
        dependencies_.global_context->GetEventBus().Publish(
            JumpToRoomRequestEvent::Create(room_id, dependencies_.session_id));
      }
    };
    status_bar->SetCustomSegment("Room", absl::StrFormat("0x%03X", room_id),
                                 std::move(room_opts));
  }
 
  const int loaded = LoadedRoomCount();
  const int total = TotalRoomCount();
  if (total > 0) {
    StatusBarSegmentOptions rooms_opts;
    rooms_opts.tooltip =
        absl::StrFormat("%d rooms loaded of %d total", loaded, total);
    status_bar->SetCustomSegment("Rooms", absl::StrFormat("%d/%d", loaded, total),
                                 std::move(rooms_opts));
  }
 
  StatusBarSegmentOptions mode_opts;
  mode_opts.tooltip = "Click to toggle Workbench / Standalone workflow";
  mode_opts.on_click = [this]() { ToggleWorkbenchWorkflowMode(true); };
  status_bar->SetEditorMode(
      IsWorkbenchWorkflowEnabled() ? "Workbench" : "Standalone",
      std::move(mode_opts));
}
 
absl::Status DungeonEditorV2::Save() {
  if (!rom_ || !rom_->is_loaded()) {
    return absl::FailedPreconditionError("ROM not loaded");
  }
 
  const auto& flags = core::FeatureFlags::get().dungeon;
 
  if (flags.kSavePalettes && gfx::PaletteManager::Get().HasUnsavedChanges()) {
    auto status = gfx::PaletteManager::Get().SaveAllToRom();
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save palette changes: %s",
                status.message().data());
      return status;
    }
    LOG_INFO("DungeonEditorV2", "Saved %zu modified colors to ROM",
             gfx::PaletteManager::Get().GetModifiedColorCount());
  }
 
  if (flags.kSaveObjects || flags.kSaveSprites || flags.kSaveRoomHeaders) {
    absl::Status save_status = absl::OkStatus();
    rooms_.ForEachLoaded([&](int room_id, zelda3::Room&) {
      if (!save_status.ok()) {
        return;
      }
      auto status = SaveRoomData(room_id);
      if (!status.ok()) {
        save_status = status;
      }
    });
    if (!save_status.ok()) {
      return save_status;
    }
  }
 
  if (flags.kSaveTorches) {
    auto status = zelda3::SaveAllTorches(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); });
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save torches: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSavePits) {
    auto status = zelda3::SaveAllPits(rom_);
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save pits: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSaveBlocks) {
    auto status = zelda3::SaveAllBlocks(rom_);
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save blocks: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSaveCollision) {
    auto status = zelda3::SaveAllCollision(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); });
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save collision: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSaveWaterFillZones) {
    auto status = SaveWaterFillZones(rom_, rooms_);
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save water fill zones: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSaveChests) {
    auto status = zelda3::SaveAllChests(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); });
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save chests: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSavePotItems) {
    auto status = zelda3::SaveAllPotItems(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); });
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save pot items: %s",
                status.message().data());
      return status;
    }
  }
 
  return absl::OkStatus();
}
 
std::vector<std::pair<uint32_t, uint32_t>> DungeonEditorV2::CollectWriteRanges()
    const {
  std::vector<std::pair<uint32_t, uint32_t>> ranges;
 
  if (!rom_ || !rom_->is_loaded()) {
    return ranges;
  }
 
  const auto& flags = core::FeatureFlags::get().dungeon;
  const auto& rom_data = rom_->vector();
 
  // Oracle of Secrets: the water fill table lives in a reserved tail region.
  // Include it in write-range reporting whenever we have dirty water fill data,
  // even if no rooms are currently loaded (SaveWaterFillZones() is room-indexed
  // and independent of room loading state).
  if (flags.kSaveWaterFillZones &&
      zelda3::kWaterFillTableEnd <= static_cast<int>(rom_data.size())) {
    bool any_dirty = false;
    rooms_.ForEachMaterialized([&](int, const zelda3::Room& room) {
      if (room.water_fill_dirty()) {
        any_dirty = true;
      }
    });
    if (any_dirty) {
      ranges.emplace_back(zelda3::kWaterFillTableStart,
                          zelda3::kWaterFillTableEnd);
    }
  }
 
  // Custom collision writes update the pointer table and append blobs into the
  // expanded collision region. SaveAllCollision() is room-indexed, so include
  // these ranges whenever any room has dirty custom collision data.
  if (flags.kSaveCollision) {
    const int ptrs_size = zelda3::kNumberOfRooms * 3;
    const bool has_ptr_table =
        (zelda3::kCustomCollisionRoomPointers + ptrs_size <=
         static_cast<int>(rom_data.size()));
    const bool has_data_region = (zelda3::kCustomCollisionDataSoftEnd <=
                                  static_cast<int>(rom_data.size()));
    if (has_ptr_table && has_data_region) {
      bool any_dirty = false;
      rooms_.ForEachMaterialized([&](int, const zelda3::Room& room) {
        if (room.custom_collision_dirty()) {
          any_dirty = true;
        }
      });
      if (any_dirty) {
        ranges.emplace_back(zelda3::kCustomCollisionRoomPointers,
                            zelda3::kCustomCollisionRoomPointers + ptrs_size);
        ranges.emplace_back(zelda3::kCustomCollisionDataPosition,
                            zelda3::kCustomCollisionDataSoftEnd);
      }
    }
  }
 
  rooms_.ForEachLoaded([&](int room_id, const zelda3::Room& room) {
    room_id = room.id();
 
    // Header range
    if (flags.kSaveRoomHeaders) {
      if (zelda3::kRoomHeaderPointer + 2 < static_cast<int>(rom_data.size())) {
        int header_ptr_table =
            (rom_data[zelda3::kRoomHeaderPointer + 2] << 16) |
            (rom_data[zelda3::kRoomHeaderPointer + 1] << 8) |
            rom_data[zelda3::kRoomHeaderPointer];
        header_ptr_table = yaze::SnesToPc(header_ptr_table);
        int table_offset = header_ptr_table + (room_id * 2);
 
        if (table_offset + 1 < static_cast<int>(rom_data.size())) {
          int address = (rom_data[zelda3::kRoomHeaderPointerBank] << 16) |
                        (rom_data[table_offset + 1] << 8) |
                        rom_data[table_offset];
          int header_location = yaze::SnesToPc(address);
          ranges.emplace_back(header_location, header_location + 14);
        }
      }
    }
 
    // Object range
    if (flags.kSaveObjects) {
      if (zelda3::kRoomObjectPointer + 2 < static_cast<int>(rom_data.size())) {
        int obj_ptr_table = (rom_data[zelda3::kRoomObjectPointer + 2] << 16) |
                            (rom_data[zelda3::kRoomObjectPointer + 1] << 8) |
                            rom_data[zelda3::kRoomObjectPointer];
        obj_ptr_table = yaze::SnesToPc(obj_ptr_table);
        int entry_offset = obj_ptr_table + (room_id * 3);
 
        if (entry_offset + 2 < static_cast<int>(rom_data.size())) {
          int tile_addr = (rom_data[entry_offset + 2] << 16) |
                          (rom_data[entry_offset + 1] << 8) |
                          rom_data[entry_offset];
          int objects_location = yaze::SnesToPc(tile_addr);
 
          auto encoded = room.EncodeObjects();
          ranges.emplace_back(objects_location,
                              objects_location + encoded.size() + 2);
        }
      }
    }
  });
 
  return ranges;
}
 
absl::Status DungeonEditorV2::SaveRoom(int room_id) {
  if (!rom_ || !rom_->is_loaded()) {
    return absl::FailedPreconditionError("ROM not loaded");
  }
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size())) {
    return absl::InvalidArgumentError("Invalid room ID");
  }
 
  const auto& flags = core::FeatureFlags::get().dungeon;
  if (flags.kSavePalettes && gfx::PaletteManager::Get().HasUnsavedChanges()) {
    auto status = gfx::PaletteManager::Get().SaveAllToRom();
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save palette changes: %s",
                status.message().data());
      return status;
    }
  }
  if (flags.kSaveObjects || flags.kSaveSprites || flags.kSaveRoomHeaders) {
    RETURN_IF_ERROR(SaveRoomData(room_id));
  }
 
  if (flags.kSaveTorches) {
    RETURN_IF_ERROR(zelda3::SaveAllTorches(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); }));
  }
  if (flags.kSavePits) {
    RETURN_IF_ERROR(zelda3::SaveAllPits(rom_));
  }
  if (flags.kSaveBlocks) {
    RETURN_IF_ERROR(zelda3::SaveAllBlocks(rom_));
  }
  if (flags.kSaveCollision) {
    RETURN_IF_ERROR(zelda3::SaveAllCollision(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); }));
  }
  if (flags.kSaveWaterFillZones) {
    RETURN_IF_ERROR(SaveWaterFillZones(rom_, rooms_));
  }
  if (flags.kSaveChests) {
    RETURN_IF_ERROR(zelda3::SaveAllChests(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); }));
  }
  if (flags.kSavePotItems) {
    RETURN_IF_ERROR(zelda3::SaveAllPotItems(
        rom_, static_cast<int>(rooms_.size()),
        [this](int room_id) { return rooms_.GetIfMaterialized(room_id); }));
  }
 
  return absl::OkStatus();
}
 
int DungeonEditorV2::LoadedRoomCount() const {
  return rooms_.LoadedCount();
}
 
absl::Status DungeonEditorV2::SaveRoomData(int room_id) {
  if (!rom_ || !rom_->is_loaded()) {
    return absl::FailedPreconditionError("ROM not loaded");
  }
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size())) {
    return absl::InvalidArgumentError("Invalid room ID");
  }
 
  auto& room = rooms_[room_id];
  if (!room.IsLoaded()) {
    return absl::OkStatus();
  }
 
  // ROM safety: validate loaded room content before writing any bytes.
  {
    zelda3::DungeonValidator validator;
    const auto result = validator.ValidateRoom(room);
    for (const auto& w : result.warnings) {
      LOG_WARN("DungeonEditorV2", "Room 0x%03X validation warning: %s", room_id,
               w.c_str());
    }
    if (!result.is_valid) {
      for (const auto& e : result.errors) {
        LOG_ERROR("DungeonEditorV2", "Room 0x%03X validation error: %s",
                  room_id, e.c_str());
      }
      if (dependencies_.toast_manager) {
        dependencies_.toast_manager->Show(
            absl::StrFormat(
                "Save blocked: room 0x%03X failed validation (%zu error(s))",
                room_id, result.errors.size()),
            ToastType::kError);
      }
      return absl::FailedPreconditionError(
          absl::StrFormat("Room 0x%03X failed validation", room_id));
    }
  }
 
  const auto& flags = core::FeatureFlags::get().dungeon;
 
  // HACK MANIFEST VALIDATION
  if (dependencies_.project && dependencies_.project->hack_manifest.loaded()) {
    std::vector<std::pair<uint32_t, uint32_t>> ranges;
    const auto& manifest = dependencies_.project->hack_manifest;
    const auto& rom_data = rom_->vector();
 
    // 1. Validate Header Range
    if (flags.kSaveRoomHeaders) {
      if (zelda3::kRoomHeaderPointer + 2 < static_cast<int>(rom_data.size())) {
        int header_ptr_table =
            (rom_data[zelda3::kRoomHeaderPointer + 2] << 16) |
            (rom_data[zelda3::kRoomHeaderPointer + 1] << 8) |
            rom_data[zelda3::kRoomHeaderPointer];
        header_ptr_table = yaze::SnesToPc(header_ptr_table);
        int table_offset = header_ptr_table + (room_id * 2);
 
        if (table_offset + 1 < static_cast<int>(rom_data.size())) {
          int address = (rom_data[zelda3::kRoomHeaderPointerBank] << 16) |
                        (rom_data[table_offset + 1] << 8) |
                        rom_data[table_offset];
          int header_location = yaze::SnesToPc(address);
          ranges.emplace_back(header_location, header_location + 14);
        }
      }
    }
 
    // 2. Validate Object Range
    if (flags.kSaveObjects) {
      if (zelda3::kRoomObjectPointer + 2 < static_cast<int>(rom_data.size())) {
        int obj_ptr_table = (rom_data[zelda3::kRoomObjectPointer + 2] << 16) |
                            (rom_data[zelda3::kRoomObjectPointer + 1] << 8) |
                            rom_data[zelda3::kRoomObjectPointer];
        obj_ptr_table = yaze::SnesToPc(obj_ptr_table);
        int entry_offset = obj_ptr_table + (room_id * 3);
 
        if (entry_offset + 2 < static_cast<int>(rom_data.size())) {
          int tile_addr = (rom_data[entry_offset + 2] << 16) |
                          (rom_data[entry_offset + 1] << 8) |
                          rom_data[entry_offset];
          int objects_location = yaze::SnesToPc(tile_addr);
 
          // Estimate size based on current encoding
          // Note: we check the *target* location (where we will write)
          // The EncodeObjects() size is what we *will* write.
          // We add 2 bytes for the size/header that SaveObjects writes.
          auto encoded = room.EncodeObjects();
          ranges.emplace_back(objects_location,
                              objects_location + encoded.size() + 2);
        }
      }
    }
 
    // `ranges` are PC offsets (ROM file offsets). The hack manifest is in SNES
    // address space (LoROM), so convert before analysis.
    const auto write_policy = dependencies_.project->rom_metadata.write_policy;
    RETURN_IF_ERROR(ValidateHackManifestSaveConflicts(
        manifest, write_policy, ranges, absl::StrFormat("room 0x%03X", room_id),
        "DungeonEditorV2", dependencies_.toast_manager));
  }
 
  if (flags.kSaveObjects) {
    auto status = room.SaveObjects();
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save room objects: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSaveSprites) {
    auto status = room.SaveSprites();
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save room sprites: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSaveRoomHeaders) {
    auto status = room.SaveRoomHeader();
    if (!status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save room header: %s",
                status.message().data());
      return status;
    }
  }
 
  if (flags.kSaveObjects && dungeon_editor_system_) {
    auto sys_status = dungeon_editor_system_->SaveRoom(room.id());
    if (!sys_status.ok()) {
      LOG_ERROR("DungeonEditorV2", "Failed to save room system data: %s",
                sys_status.message().data());
    }
  }
 
  return absl::OkStatus();
}
 
bool DungeonEditorV2::IsWorkbenchWorkflowEnabled() const {
  if (!core::FeatureFlags::get().dungeon.kUseWorkbench) {
    return false;
  }
  if (!dependencies_.window_manager) {
    return true;
  }
  return dependencies_.window_manager->IsWindowOpen("dungeon.workbench");
}
 
void DungeonEditorV2::SetWorkbenchWorkflowMode(bool enabled, bool show_toast) {
  auto* window_manager = dependencies_.window_manager;
  if (!window_manager) {
    return;
  }
 
  const size_t session_id = window_manager->GetActiveSessionId();
  const bool was_enabled = IsWorkbenchWorkflowEnabled();
 
  if (enabled) {
    window_manager->OpenWindow(session_id, "dungeon.workbench");
 
    // Hide standalone workflow windows unless explicitly pinned.
    for (const auto& descriptor :
         window_manager->GetWindowsInCategory(session_id, "Dungeon")) {
      const std::string& card_id = descriptor.card_id;
      if (card_id == "dungeon.workbench") {
        continue;
      }
      if (window_manager->IsWindowPinned(session_id, card_id)) {
        continue;
      }
      const bool is_room_window = card_id.rfind("dungeon.room_", 0) == 0;
      if (card_id == kRoomSelectorId || card_id == kRoomMatrixId ||
          is_room_window) {
        window_manager->CloseWindow(session_id, card_id);
      }
    }
  } else {
    window_manager->CloseWindow(session_id, "dungeon.workbench");
    window_manager->OpenWindow(session_id, kRoomSelectorId);
    window_manager->OpenWindow(session_id, kRoomMatrixId);
    if (current_room_id_ >= 0) {
      ShowRoomPanel(current_room_id_);
    }
  }
 
  if (show_toast && dependencies_.toast_manager && was_enabled != enabled) {
    dependencies_.toast_manager->Show(
        enabled ? "Dungeon workflow: Workbench"
                : "Dungeon workflow: Standalone Panels",
        ToastType::kInfo);
  }
}
 
void DungeonEditorV2::QueueWorkbenchWorkflowMode(bool enabled,
                                                 bool show_toast) {
  pending_workflow_mode_.enabled = enabled;
  pending_workflow_mode_.show_toast = show_toast;
  pending_workflow_mode_.pending = true;
}
 
void DungeonEditorV2::ToggleWorkbenchWorkflowMode(bool show_toast) {
  QueueWorkbenchWorkflowMode(!IsWorkbenchWorkflowEnabled(), show_toast);
}
 
void DungeonEditorV2::DrawRoomPanels() {
  for (int i = 0; i < active_rooms_.Size; i++) {
    int room_id = active_rooms_[i];
    std::string card_id = absl::StrFormat("dungeon.room_%d", room_id);
    bool panel_visible = true;
    if (dependencies_.window_manager) {
      panel_visible = dependencies_.window_manager->IsWindowOpen(card_id);
    }
 
    if (!panel_visible) {
      dependencies_.window_manager->UnregisterWindow(card_id);
      room_cards_.erase(room_id);
      active_rooms_.erase(active_rooms_.Data + i);
      ReleaseRoomPanelSlotId(room_id);
      // Clean up viewer
      room_viewers_.Erase(room_id);
      i--;
      continue;
    }
 
    bool is_pinned = dependencies_.window_manager &&
                     dependencies_.window_manager->IsWindowPinned(card_id);
    std::string active_category =
        dependencies_.window_manager
            ? dependencies_.window_manager->GetActiveCategory()
            : "";
 
    if (active_category != "Dungeon" && !is_pinned) {
      continue;
    }
 
    // Ensure room card exists (should have been created by ShowRoomPanel/ShowPanel)
    if (room_cards_.find(room_id) == room_cards_.end()) {
      ShowRoomPanel(room_id);
    }
 
    auto& room_card = room_cards_[room_id];
    bool open = true;
 
    ImGui::SetNextWindowClass(&room_window_class_);
    if (room_dock_id_ == 0) {
      room_dock_id_ = ImGui::GetID("DungeonRoomDock");
    }
    ImGui::SetNextWindowDockID(room_dock_id_, ImGuiCond_FirstUseEver);
 
    if (room_card->Begin(&open)) {
      if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows)) {
        OnRoomSelected(room_id, /*request_focus=*/false);
      }
      DrawRoomTab(room_id);
    }
    room_card->End();
 
    if (!open) {
      if (dependencies_.window_manager) {
        dependencies_.window_manager->UnregisterWindow(card_id);
      }
 
      room_cards_.erase(room_id);
      active_rooms_.erase(active_rooms_.Data + i);
      room_viewers_.Erase(room_id);
      ReleaseRoomPanelSlotId(room_id);
      i--;
    }
  }
}
 
int DungeonEditorV2::GetOrCreateRoomPanelSlotId(int room_id) {
  if (auto it = room_panel_slot_ids_.find(room_id);
      it != room_panel_slot_ids_.end()) {
    return it->second;
  }
  const int slot_id = next_room_panel_slot_id_++;
  room_panel_slot_ids_[room_id] = slot_id;
  return slot_id;
}
 
void DungeonEditorV2::ReleaseRoomPanelSlotId(int room_id) {
  room_panel_slot_ids_.erase(room_id);
}
 
void DungeonEditorV2::DrawRoomTab(int room_id) {
  const auto& theme = AgentUI::GetTheme();
  if (room_id < 0 || room_id >= 0x128) {
    ImGui::Text("Invalid room ID: %d", room_id);
    return;
  }
 
  auto& room = rooms_[room_id];
 
  if (!room.IsLoaded()) {
    auto status = room_loader_.LoadRoom(room_id, room);
    if (!status.ok()) {
      ImGui::TextColored(theme.text_error_red, "Failed to load room: %s",
                         status.message().data());
      return;
    }
 
    if (dungeon_editor_system_) {
      auto sys_status = dungeon_editor_system_->ReloadRoom(room_id);
      if (!sys_status.ok()) {
        LOG_ERROR("DungeonEditorV2", "Failed to load system data: %s",
                  sys_status.message().data());
      }
    }
  }
 
  if (room.IsLoaded()) {
    bool needs_render = false;
 
    if (room.blocks().empty()) {
      room.LoadRoomGraphics(room.blockset());
      needs_render = true;
    }
 
    if (!room.AreObjectsLoaded()) {
      room.LoadObjects();
      needs_render = true;
    }
 
    auto& bg1_bitmap = room.bg1_buffer().bitmap();
    if (needs_render || !bg1_bitmap.is_active() || bg1_bitmap.width() == 0) {
      room.RenderRoomGraphics();
    }
  }
 
  if (room.IsLoaded()) {
    ImGui::TextColored(theme.text_success_green, ICON_MD_CHECK " Loaded");
  } else {
    ImGui::TextColored(theme.text_error_red, ICON_MD_PENDING " Not Loaded");
  }
  ImGui::SameLine();
  ImGui::TextDisabled("Objects: %zu", room.GetTileObjects().size());
 
  if (core::FeatureFlags::get().dungeon.kUseWorkbench &&
      !IsWorkbenchWorkflowEnabled()) {
    ImGui::SameLine();
    const std::string return_label = absl::StrFormat(
        ICON_MD_WORKSPACES " Workbench##return_workbench_%03X", room_id);
    if (ImGui::SmallButton(return_label.c_str())) {
      QueueWorkbenchWorkflowMode(true);
    }
    if (ImGui::IsItemHovered()) {
      ImGui::SetTooltip(
          "Switch back to the integrated Dungeon Workbench workflow "
          "(Ctrl+Shift+W).");
    }
  }
 
  // Warp to Room button — sends room ID to running Mesen2 emulator
  ImGui::SameLine();
  {
    auto client = emu::mesen::MesenClientRegistry::GetClient();
    bool connected = client && client->IsConnected();
    if (!connected) {
      ImGui::BeginDisabled();
    }
    std::string warp_label =
        absl::StrFormat(ICON_MD_ROCKET_LAUNCH " Warp##warp_%03X", room_id);
    if (ImGui::SmallButton(warp_label.c_str())) {
      auto status = client->WriteWord(0x7E00A0, static_cast<uint16_t>(room_id));
      if (status.ok()) {
        if (dependencies_.toast_manager) {
          dependencies_.toast_manager->Show(
              absl::StrFormat("Warped to room 0x%03X", room_id),
              ToastType::kSuccess);
        }
      } else {
        if (dependencies_.toast_manager) {
          dependencies_.toast_manager->Show(
              absl::StrFormat("Warp failed: %s", status.message()),
              ToastType::kError);
        }
      }
    }
    if (!connected) {
      ImGui::EndDisabled();
      if (ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled)) {
        ImGui::SetTooltip("Connect to Mesen2 first");
      }
    } else {
      if (ImGui::IsItemHovered()) {
        ImGui::SetTooltip("Warp to room 0x%03X in Mesen2", room_id);
      }
    }
  }
 
  ImGui::Separator();
 
  // Use per-room viewer
  if (auto* viewer = GetViewerForRoom(room_id)) {
    viewer->DrawDungeonCanvas(room_id);
  }
}
 
void DungeonEditorV2::OnRoomSelected(int room_id, RoomSelectionIntent intent) {
  switch (intent) {
    case RoomSelectionIntent::kFocusInWorkbench:
      OnRoomSelected(room_id, /*request_focus=*/true);
      break;
    case RoomSelectionIntent::kOpenStandalone: {
      // Explicitly pivot to panel workflow when user asks for standalone room.
      if (room_id < 0 || room_id >= static_cast<int>(rooms_.size())) {
        return;
      }
      if (IsWorkbenchWorkflowEnabled()) {
        SetWorkbenchWorkflowMode(false);
      }
      // Update shared state (same as OnRoomSelected with request_focus=true)
      OnRoomSelected(room_id, /*request_focus=*/false);
      // Now force-open a standalone panel for this room
      ShowRoomPanel(room_id);
      break;
    }
    case RoomSelectionIntent::kPreview:
      OnRoomSelected(room_id, /*request_focus=*/false);
      break;
  }
}
 
void DungeonEditorV2::OnRoomSelected(int room_id, bool request_focus) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size())) {
    LOG_WARN("DungeonEditorV2", "Ignoring invalid room selection: %d", room_id);
    return;
  }
  if (room_id != current_room_id_ && workbench_panel_) {
    workbench_panel_->NotifyRoomChanged(current_room_id_);
  }
  current_room_id_ = room_id;
  room_selector_.set_current_room_id(static_cast<uint16_t>(room_id));
 
  // Track recent rooms (remove if already present, add to front)
  recent_rooms_.erase(
      std::remove(recent_rooms_.begin(), recent_rooms_.end(), room_id),
      recent_rooms_.end());
  recent_rooms_.push_front(room_id);
  if (recent_rooms_.size() > kMaxRecentRooms) {
    recent_rooms_.pop_back();
  }
 
  if (dungeon_editor_system_) {
    dungeon_editor_system_->SetExternalRoom(&rooms_[room_id]);
  }
 
  // Update all sub-panels (Object Editor, Sprite Editor, etc.)
  SyncPanelsToRoom(room_id);
 
  // Sync palette with current room (must happen before early return for focus changes)
 
  // Sync palette with current room (must happen before early return for focus changes)
  if (room_id >= 0 && room_id < (int)rooms_.size()) {
    auto& room = rooms_[room_id];
    if (!room.IsLoaded()) {
      room_loader_.LoadRoom(room_id, room);
    }
 
    if (room.IsLoaded()) {
      current_palette_id_ = room.ResolveDungeonPaletteId();
      current_palette_group_id_ = current_palette_id_;
      palette_editor_.SetCurrentPaletteId(current_palette_id_);
 
      // Update viewer and object editor palette
      if (auto* viewer = GetViewerForRoom(room_id)) {
        viewer->SetCurrentPaletteId(current_palette_id_);
 
        if (game_data()) {
          auto dungeon_main_pal_group =
              game_data()->palette_groups.dungeon_main;
          if (current_palette_id_ < (int)dungeon_main_pal_group.size()) {
            current_palette_ = dungeon_main_pal_group[current_palette_id_];
            auto result =
                gfx::CreatePaletteGroupFromLargePalette(current_palette_);
            if (result.ok()) {
              current_palette_group_ = result.value();
              viewer->SetCurrentPaletteGroup(current_palette_group_);
              if (object_selector_panel_) {
                object_selector_panel_->SetCurrentPaletteGroup(
                    current_palette_group_);
              }
              // Sync palette to graphics panel for proper sheet coloring
              if (room_graphics_panel_) {
                room_graphics_panel_->SetCurrentPaletteGroup(
                    current_palette_group_);
              }
            }
          }
        }
      }
    }
  }
 
  // Workbench mode uses a single stable window and does not spawn per-room
  // panels. Keep selection + panels in sync and return.
  if (IsWorkbenchWorkflowEnabled()) {
    if (dependencies_.window_manager && request_focus) {
      // Only force-show if it's already visible or if it's the first initialization
      // This avoids obtrusive behavior when the user explicitly closed it.
      if (dependencies_.window_manager->IsWindowOpen("dungeon.workbench")) {
        dependencies_.window_manager->OpenWindow("dungeon.workbench");
      }
    }
    return;
  }
 
  // Check if room is already open
  for (int i = 0; i < active_rooms_.Size; i++) {
    if (active_rooms_[i] == room_id) {
      // Always ensure panel is visible, even if already in active_rooms_
      if (dependencies_.window_manager) {
        std::string card_id = absl::StrFormat("dungeon.room_%d", room_id);
        dependencies_.window_manager->OpenWindow(card_id);
      }
      if (request_focus) {
        FocusRoom(room_id);
      }
      return;
    }
  }
 
  active_rooms_.push_back(room_id);
  room_selector_.set_active_rooms(active_rooms_);
 
  if (dependencies_.window_manager) {
    // Use unified ResourceLabelProvider for room names
    std::string room_name = absl::StrFormat(
        "[%03X] %s", room_id, zelda3::GetRoomLabel(room_id).c_str());
 
    std::string base_card_id = absl::StrFormat("dungeon.room_%d", room_id);
 
    dependencies_.window_manager->RegisterWindow(
        {.card_id = base_card_id,
         .display_name = room_name,
         .window_title = ICON_MD_GRID_ON " " + room_name,
         .icon = ICON_MD_GRID_ON,
         .category = "Dungeon",
         .shortcut_hint = "",
         .visibility_flag = nullptr,
         .priority = 200 + room_id});
 
    dependencies_.window_manager->OpenWindow(base_card_id);
  }
}
 
void DungeonEditorV2::OnEntranceSelected(int entrance_id) {
  if (entrance_id < 0 || entrance_id >= static_cast<int>(entrances_.size())) {
    return;
  }
  int room_id = entrances_[entrance_id].room_;
  OnRoomSelected(room_id);
}
 
void DungeonEditorV2::SaveAllRooms() {
  auto status = Save();
  if (status.ok()) {
    if (dependencies_.toast_manager) {
      dependencies_.toast_manager->Show("All rooms saved", ToastType::kSuccess);
    }
  } else {
    LOG_ERROR("DungeonEditorV2", "SaveAllRooms failed: %s",
              status.message().data());
    if (dependencies_.toast_manager) {
      dependencies_.toast_manager->Show(
          absl::StrFormat("Save all failed: %s", status.message()),
          ToastType::kError);
    }
  }
}
 
void DungeonEditorV2::add_room(int room_id) {
  OnRoomSelected(room_id);
}
 
void DungeonEditorV2::FocusRoom(int room_id) {
  auto it = room_cards_.find(room_id);
  if (it != room_cards_.end()) {
    it->second->Focus();
  }
}
 
void DungeonEditorV2::SelectObject(int obj_id) {
  if (object_selector_panel_) {
    OpenWindow(kObjectSelectorId);
    object_selector_panel_->SelectObject(obj_id);
  }
}
 
void DungeonEditorV2::SetAgentMode(bool enabled) {
  if (enabled && dependencies_.window_manager) {
    if (IsWorkbenchWorkflowEnabled()) {
      OpenWindow("dungeon.workbench");
    } else {
      OpenWindow(kRoomSelectorId);
    }
    OpenWindow(kObjectSelectorId);
    OpenWindow(kObjectEditorId);
    OpenWindow(kRoomGraphicsId);
    if (object_selector_panel_) {
      object_selector_panel_->SetAgentOptimizedLayout(true);
    }
  }
}
 
void DungeonEditorV2::ProcessDeferredTextures() {
  gfx::Arena::Get().ProcessTextureQueue(renderer_);
}
 
void DungeonEditorV2::HandleObjectPlaced(const zelda3::RoomObject& obj) {
  if (!IsValidRoomId(current_room_id_)) {
    LOG_ERROR("DungeonEditorV2", "Cannot place object: Invalid room ID %d",
              current_room_id_);
    if (dependencies_.toast_manager) {
      dependencies_.toast_manager->Show(
          absl::StrFormat("Object 0x%02X: no room selected (invalid room %d)",
                          obj.id_, current_room_id_),
          ToastType::kError);
    }
    if (object_selector_panel_) {
      object_selector_panel_->SetPlacementError(absl::StrFormat(
          "Cannot place 0x%02X: invalid room %d", obj.id_, current_room_id_));
    }
    return;
  }
 
  auto& room = rooms_[current_room_id_];
 
  LOG_INFO("DungeonEditorV2",
           "Placing object ID=0x%02X at position (%d,%d) in room %03X", obj.id_,
           obj.x_, obj.y_, current_room_id_);
 
  room.RenderRoomGraphics();
  LOG_DEBUG("DungeonEditorV2",
            "Object placed and room re-rendered successfully");
  // Brief success feedback so the user knows the placement was accepted.
  // Kept minimal (no inline panel update) — success is non-spammy by design.
  if (dependencies_.toast_manager) {
    dependencies_.toast_manager->Show(
        absl::StrFormat("Placed 0x%02X in room %03X", obj.id_,
                        current_room_id_),
        ToastType::kSuccess);
  }
}
 
void DungeonEditorV2::OpenGraphicsEditorForObject(
    int room_id, const zelda3::RoomObject& object) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size())) {
    LOG_WARN("DungeonEditorV2", "Edit Graphics ignored (invalid room id %d)",
             room_id);
    return;
  }
 
  auto* editor_manager = static_cast<EditorManager*>(dependencies_.custom_data);
  if (!editor_manager) {
    LOG_WARN("DungeonEditorV2",
             "Edit Graphics ignored (editor manager unavailable)");
    return;
  }
 
  auto& room = rooms_[room_id];
  room.LoadRoomGraphics(room.blockset());
 
  uint16_t sheet_id = 0;
  uint16_t tile_index = 0;
  bool resolved_sheet = false;
  if (auto tiles_or = object.GetTiles();
      tiles_or.ok() && !tiles_or.value().empty()) {
    const uint16_t tile_id = tiles_or.value().front().id_;
    const size_t block_index = static_cast<size_t>(tile_id / 64);
    const auto blocks = room.blocks();
    if (block_index < blocks.size()) {
      sheet_id = blocks[block_index];
      resolved_sheet = true;
    }
    const int tiles_per_row = gfx::kTilesheetWidth / 8;
    const int tiles_per_col = gfx::kTilesheetHeight / 8;
    const int tiles_per_sheet = tiles_per_row * tiles_per_col;
    if (tiles_per_sheet > 0) {
      tile_index = static_cast<uint16_t>(tile_id % tiles_per_sheet);
    }
  }
 
  editor_manager->SwitchToEditor(EditorType::kGraphics, true);
  if (auto* editor_set = editor_manager->GetCurrentEditorSet()) {
    if (auto* graphics = editor_set->GetGraphicsEditor()) {
      if (resolved_sheet) {
        graphics->SelectSheet(sheet_id);
        graphics->HighlightTile(sheet_id, tile_index,
                                absl::StrFormat("Object 0x%02X", object.id_));
      }
    }
  }
 
  if (dependencies_.window_manager) {
    dependencies_.window_manager->ShowAllWindowsInCategory("Graphics");
  }
}
 
void DungeonEditorV2::SwapRoomInPanel(int old_room_id, int new_room_id) {
  // Defer the swap until after the current frame's draw phase completes
  // This prevents modifying data structures while ImGui is still using them
  if (new_room_id < 0 || new_room_id >= static_cast<int>(rooms_.size())) {
    return;
  }
  pending_swap_.old_room_id = old_room_id;
  pending_swap_.new_room_id = new_room_id;
  pending_swap_.pending = true;
}
 
void DungeonEditorV2::ProcessPendingSwap() {
  if (!pending_swap_.pending) {
    return;
  }
 
  int old_room_id = pending_swap_.old_room_id;
  int new_room_id = pending_swap_.new_room_id;
  pending_swap_.pending = false;
 
  // Find the position of old_room in active_rooms_
  int swap_index = -1;
  for (int i = 0; i < active_rooms_.Size; i++) {
    if (active_rooms_[i] == old_room_id) {
      swap_index = i;
      break;
    }
  }
 
  if (swap_index < 0) {
    // Old room not found in active rooms, just select the new one
    OnRoomSelected(new_room_id);
    return;
  }
 
  // Avoid swapping into an already-open room panel (the per-room maps assume
  // room IDs are unique). In this case, just focus/select the existing room.
  for (int i = 0; i < active_rooms_.Size; i++) {
    if (i != swap_index && active_rooms_[i] == new_room_id) {
      OnRoomSelected(new_room_id);
      return;
    }
  }
 
  // Preserve the old panel's stable ImGui window identity by transferring its
  // slot id to the new room id.
  int slot_id = -1;
  if (auto it = room_panel_slot_ids_.find(old_room_id);
      it != room_panel_slot_ids_.end()) {
    slot_id = it->second;
    room_panel_slot_ids_.erase(it);
  } else {
    slot_id = next_room_panel_slot_id_++;
  }
  room_panel_slot_ids_[new_room_id] = slot_id;
 
  // Preserve the viewer instance so canvas pan/zoom and UI state don't reset
  // when navigating with arrows (swap-in-panel).
  room_viewers_.Rename(old_room_id, new_room_id);
 
  // Replace old room with new room in active_rooms_
  active_rooms_[swap_index] = new_room_id;
  room_selector_.set_active_rooms(active_rooms_);
 
  // Unregister old panel
  if (dependencies_.window_manager) {
    std::string old_card_id = absl::StrFormat("dungeon.room_%d", old_room_id);
    const bool old_pinned =
        dependencies_.window_manager->IsWindowPinned(old_card_id);
    dependencies_.window_manager->UnregisterWindow(old_card_id);
 
    // Register new panel
    // Use unified ResourceLabelProvider for room names
    std::string new_room_name = absl::StrFormat(
        "[%03X] %s", new_room_id, zelda3::GetRoomLabel(new_room_id).c_str());
 
    std::string new_card_id = absl::StrFormat("dungeon.room_%d", new_room_id);
 
    dependencies_.window_manager->RegisterWindow(
        {.card_id = new_card_id,
         .display_name = new_room_name,
         .window_title = ICON_MD_GRID_ON " " + new_room_name,
         .icon = ICON_MD_GRID_ON,
         .category = "Dungeon",
         .shortcut_hint = "",
         .visibility_flag = nullptr,
         .priority = 200 + new_room_id});
 
    if (old_pinned) {
      dependencies_.window_manager->SetWindowPinned(new_card_id, true);
    }
    dependencies_.window_manager->OpenWindow(new_card_id);
  }
 
  // Clean up old room's card and viewer
  room_cards_.erase(old_room_id);
 
  // Update current selection
  OnRoomSelected(new_room_id, /*request_focus=*/false);
}
 
void DungeonEditorV2::ProcessPendingWorkflowMode() {
  if (!pending_workflow_mode_.pending) {
    return;
  }
 
  const bool enabled = pending_workflow_mode_.enabled;
  const bool show_toast = pending_workflow_mode_.show_toast;
  pending_workflow_mode_.pending = false;
  SetWorkbenchWorkflowMode(enabled, show_toast);
}
 
void DungeonEditorV2::TouchViewerLru(int room_id) {
  room_viewers_.Touch(room_id);
}
 
void DungeonEditorV2::RemoveViewerFromLru(int room_id) {
  // No-op: LruCache handles removal internally via Erase()
  (void)room_id;
}
 
DungeonCanvasViewer* DungeonEditorV2::GetViewerForRoom(int room_id) {
  if (IsWorkbenchWorkflowEnabled()) {
    (void)room_id;
    return GetWorkbenchViewer();
  }
 
  // Set eviction predicate to protect active rooms from eviction
  room_viewers_.SetEvictionPredicate([this](const int& candidate) {
    for (int i = 0; i < active_rooms_.size(); ++i) {
      if (active_rooms_[i] == candidate)
        return false;
    }
    return true;
  });
 
  if (auto* existing = room_viewers_.Get(room_id)) {
    // Viewer already exists - Get() already touched LRU
    auto* viewer_ptr = existing->get();
 
    // Update pinned state from manager
    if (dependencies_.window_manager) {
      std::string card_id = absl::StrFormat("dungeon.room_%d", room_id);
      viewer_ptr->SetPinned(
          dependencies_.window_manager->IsWindowPinned(card_id));
      viewer_ptr->SetPinCallback([this, card_id, room_id](bool pinned) {
        if (dependencies_.window_manager) {
          dependencies_.window_manager->SetWindowPinned(card_id, pinned);
          if (auto* v = GetViewerForRoom(room_id)) {
            v->SetPinned(pinned);
          }
        }
      });
    }
 
    return viewer_ptr;
  }
 
  // Creating a new viewer - Insert will handle LRU and eviction
  {
    auto viewer = std::make_unique<DungeonCanvasViewer>(rom_);
    viewer->SetCompactHeaderMode(false);
    viewer->SetRoomDetailsExpanded(true);
    DungeonCanvasViewer* viewer_ptr = viewer.get();
    viewer->SetRooms(&rooms_);
    viewer->SetRenderer(renderer_);
    viewer->SetCurrentPaletteGroup(current_palette_group_);
    viewer->SetCurrentPaletteId(current_palette_id_);
    viewer->SetGameData(game_data_);
 
    // These hooks must remain correct even when a room panel swaps rooms while
    // keeping the same viewer instance (to preserve canvas pan/zoom + UI
    // state). Use the viewer's best-effort current room context instead of
    // capturing room_id at creation time.
    viewer->object_interaction().SetMutationCallback([this, viewer_ptr]() {
      const int rid = viewer_ptr ? viewer_ptr->current_room_id() : -1;
      if (rid >= 0 && rid < static_cast<int>(rooms_.size())) {
        const auto domain =
            viewer_ptr->object_interaction().last_mutation_domain();
        if (domain == MutationDomain::kTileObjects) {
          BeginUndoSnapshot(rid);
        } else if (domain == MutationDomain::kCustomCollision) {
          BeginCollisionUndoSnapshot(rid);
        } else if (domain == MutationDomain::kWaterFill) {
          BeginWaterFillUndoSnapshot(rid);
        }
      }
    });
 
    viewer->object_interaction().SetCacheInvalidationCallback([this,
                                                               viewer_ptr]() {
      const int rid = viewer_ptr ? viewer_ptr->current_room_id() : -1;
      if (rid >= 0 && rid < static_cast<int>(rooms_.size())) {
        const auto domain =
            viewer_ptr->object_interaction().last_invalidation_domain();
        if (domain == MutationDomain::kTileObjects) {
          rooms_[rid].MarkObjectsDirty();
          rooms_[rid].RenderRoomGraphics();
          // Drag edits invalidate incrementally; finalize once the drag ends
          // (TileObjectHandler emits an extra invalidation on release).
          const auto mode =
              viewer_ptr->object_interaction().mode_manager().GetMode();
          if (mode != InteractionMode::DraggingObjects) {
            FinalizeUndoAction(rid);
          }
        } else if (domain == MutationDomain::kCustomCollision) {
          const auto mode =
              viewer_ptr->object_interaction().mode_manager().GetMode();
          const auto& st =
              viewer_ptr->object_interaction().mode_manager().GetModeState();
          if (mode == InteractionMode::PaintCollision && st.is_painting) {
            return;
          }
          FinalizeCollisionUndoAction(rid);
        } else if (domain == MutationDomain::kWaterFill) {
          const auto mode =
              viewer_ptr->object_interaction().mode_manager().GetMode();
          const auto& st =
              viewer_ptr->object_interaction().mode_manager().GetModeState();
          if (mode == InteractionMode::PaintWaterFill && st.is_painting) {
            return;
          }
          FinalizeWaterFillUndoAction(rid);
        }
      }
    });
 
    viewer->object_interaction().SetObjectPlacedCallback(
        [this](const zelda3::RoomObject& obj) { HandleObjectPlaced(obj); });
 
    if (dungeon_editor_system_) {
      viewer->SetEditorSystem(dungeon_editor_system_.get());
    }
    viewer->SetRoomNavigationCallback([this](int target_room) {
      if (target_room >= 0 && target_room < static_cast<int>(rooms_.size())) {
        OnRoomSelected(target_room);
      }
    });
    // Swap callback swaps the room in the current panel instead of opening new
    viewer->SetRoomSwapCallback([this](int old_room, int new_room) {
      SwapRoomInPanel(old_room, new_room);
    });
    viewer->SetShowObjectPanelCallback(
        [this]() { OpenWindow(kObjectSelectorId); });
    viewer->SetShowSpritePanelCallback(
        [this]() { OpenWindow("dungeon.sprite_editor"); });
    viewer->SetShowItemPanelCallback(
        [this]() { OpenWindow("dungeon.item_editor"); });
    viewer->SetShowRoomListCallback([this]() {
      OpenWindow(IsWorkbenchWorkflowEnabled() ? "dungeon.workbench"
                                             : kRoomSelectorId);
    });
    viewer->SetShowRoomMatrixCallback([this]() { OpenWindow(kRoomMatrixId); });
    viewer->SetShowEntranceListCallback(
        [this]() { OpenWindow(kEntranceListId); });
    viewer->SetShowRoomGraphicsCallback(
        [this]() { OpenWindow(kRoomGraphicsId); });
    viewer->SetShowDungeonSettingsCallback(
        [this]() { OpenWindow("dungeon.settings"); });
    viewer->SetEditGraphicsCallback(
        [this](int target_room_id, const zelda3::RoomObject& object) {
          OpenGraphicsEditorForObject(target_room_id, object);
        });
    viewer->SetSaveRoomCallback([this](int target_room_id) {
      auto status = SaveRoom(target_room_id);
      if (!status.ok()) {
        LOG_ERROR("DungeonEditorV2", "Save Room failed: %s",
                  status.message().data());
        if (dependencies_.toast_manager) {
          dependencies_.toast_manager->Show(
              absl::StrFormat("Save Room failed: %s", status.message()),
              ToastType::kError);
        }
        return;
      }
      if (dependencies_.toast_manager) {
        dependencies_.toast_manager->Show("Room saved", ToastType::kSuccess);
      }
    });
 
    // Wire up pinning for room panels
    if (dependencies_.window_manager) {
      std::string card_id = absl::StrFormat("dungeon.room_%d", room_id);
      viewer->SetPinned(dependencies_.window_manager->IsWindowPinned(card_id));
      viewer->SetPinCallback([this, card_id, room_id](bool pinned) {
        if (dependencies_.window_manager) {
          dependencies_.window_manager->SetWindowPinned(card_id, pinned);
          // Sync state back to viewer in all panels showing this room
          if (auto* v = GetViewerForRoom(room_id)) {
            v->SetPinned(pinned);
          }
        }
      });
    }
 
    viewer->SetMinecartTrackPanel(minecart_track_editor_panel_);
    viewer->SetProject(dependencies_.project);
 
    auto* stored = room_viewers_.Insert(room_id, std::move(viewer));
    return stored->get();
  }
}
 
DungeonCanvasViewer* DungeonEditorV2::GetWorkbenchViewer() {
  if (!workbench_viewer_) {
    workbench_viewer_ = std::make_unique<DungeonCanvasViewer>(rom_);
    auto* viewer = workbench_viewer_.get();
    viewer->SetCompactHeaderMode(true);
    viewer->SetRoomDetailsExpanded(false);
    viewer->SetHeaderVisible(false);
    viewer->SetHeaderHiddenMetadataHudVisible(false);
    viewer->SetRooms(&rooms_);
    viewer->SetRenderer(renderer_);
    viewer->SetCurrentPaletteGroup(current_palette_group_);
    viewer->SetCurrentPaletteId(current_palette_id_);
    viewer->SetGameData(game_data_);
 
    // Workbench uses a single viewer; these hooks use the viewer's current room
    // context (set at DrawDungeonCanvas start) so room switching stays correct.
    viewer->object_interaction().SetMutationCallback([this, viewer]() {
      const int rid = viewer ? viewer->current_room_id() : -1;
      if (rid >= 0 && rid < static_cast<int>(rooms_.size())) {
        const auto domain = viewer->object_interaction().last_mutation_domain();
        if (domain == MutationDomain::kTileObjects) {
          BeginUndoSnapshot(rid);
        } else if (domain == MutationDomain::kCustomCollision) {
          BeginCollisionUndoSnapshot(rid);
        } else if (domain == MutationDomain::kWaterFill) {
          BeginWaterFillUndoSnapshot(rid);
        }
      }
    });
    viewer->object_interaction().SetCacheInvalidationCallback([this, viewer]() {
      const int rid = viewer ? viewer->current_room_id() : -1;
      if (rid >= 0 && rid < static_cast<int>(rooms_.size())) {
        const auto domain =
            viewer->object_interaction().last_invalidation_domain();
        if (domain == MutationDomain::kTileObjects) {
          rooms_[rid].MarkObjectsDirty();
          rooms_[rid].RenderRoomGraphics();
          const auto mode =
              viewer->object_interaction().mode_manager().GetMode();
          if (mode != InteractionMode::DraggingObjects) {
            FinalizeUndoAction(rid);
          }
        } else if (domain == MutationDomain::kCustomCollision) {
          const auto mode =
              viewer->object_interaction().mode_manager().GetMode();
          const auto& st =
              viewer->object_interaction().mode_manager().GetModeState();
          if (mode == InteractionMode::PaintCollision && st.is_painting) {
            return;
          }
          FinalizeCollisionUndoAction(rid);
        } else if (domain == MutationDomain::kWaterFill) {
          const auto mode =
              viewer->object_interaction().mode_manager().GetMode();
          const auto& st =
              viewer->object_interaction().mode_manager().GetModeState();
          if (mode == InteractionMode::PaintWaterFill && st.is_painting) {
            return;
          }
          FinalizeWaterFillUndoAction(rid);
        }
      }
    });
 
    viewer->object_interaction().SetObjectPlacedCallback(
        [this](const zelda3::RoomObject& obj) { HandleObjectPlaced(obj); });
 
    if (dungeon_editor_system_) {
      viewer->SetEditorSystem(dungeon_editor_system_.get());
    }
 
    // In workbench mode, arrow navigation swaps the current room without
    // changing window identities.
    viewer->SetRoomSwapCallback([this](int /*old_room*/, int new_room) {
      OnRoomSelected(new_room, /*request_focus=*/false);
    });
    viewer->SetRoomNavigationCallback([this](int target_room) {
      OnRoomSelected(target_room, /*request_focus=*/false);
    });
 
    viewer->SetShowObjectPanelCallback(
        [this]() { OpenWindow(kObjectSelectorId); });
    viewer->SetShowSpritePanelCallback(
        [this]() { OpenWindow("dungeon.sprite_editor"); });
    viewer->SetShowItemPanelCallback(
        [this]() { OpenWindow("dungeon.item_editor"); });
    viewer->SetShowRoomListCallback([this]() {
      OpenWindow(IsWorkbenchWorkflowEnabled() ? "dungeon.workbench"
                                             : kRoomSelectorId);
    });
    viewer->SetShowRoomMatrixCallback([this]() { OpenWindow(kRoomMatrixId); });
    viewer->SetShowEntranceListCallback(
        [this]() { OpenWindow(kEntranceListId); });
    viewer->SetShowRoomGraphicsCallback(
        [this]() { OpenWindow(kRoomGraphicsId); });
    viewer->SetShowDungeonSettingsCallback(
        [this]() { OpenWindow("dungeon.settings"); });
    viewer->SetEditGraphicsCallback(
        [this](int target_room_id, const zelda3::RoomObject& object) {
          OpenGraphicsEditorForObject(target_room_id, object);
        });
    viewer->SetSaveRoomCallback([this](int target_room_id) {
      auto status = SaveRoom(target_room_id);
      if (!status.ok()) {
        LOG_ERROR("DungeonEditorV2", "Save Room failed: %s",
                  status.message().data());
        if (dependencies_.toast_manager) {
          dependencies_.toast_manager->Show(
              absl::StrFormat("Save Room failed: %s", status.message()),
              ToastType::kError);
        }
        return;
      }
      if (dependencies_.toast_manager) {
        dependencies_.toast_manager->Show("Room saved", ToastType::kSuccess);
      }
    });
 
    viewer->SetMinecartTrackPanel(minecart_track_editor_panel_);
    viewer->SetProject(dependencies_.project);
  }
 
  return workbench_viewer_.get();
}
 
DungeonCanvasViewer* DungeonEditorV2::GetWorkbenchCompareViewer() {
  if (!workbench_compare_viewer_) {
    workbench_compare_viewer_ = std::make_unique<DungeonCanvasViewer>(rom_);
    auto* viewer = workbench_compare_viewer_.get();
    viewer->SetCompactHeaderMode(true);
    viewer->SetRoomDetailsExpanded(false);
    viewer->SetHeaderHiddenMetadataHudVisible(false);
    viewer->SetRooms(&rooms_);
    viewer->SetRenderer(renderer_);
    viewer->SetCurrentPaletteGroup(current_palette_group_);
    viewer->SetCurrentPaletteId(current_palette_id_);
    viewer->SetGameData(game_data_);
 
    // Compare viewer is read-only by default: no object selection/mutation, but
    // still allows canvas pan/zoom.
    viewer->SetObjectInteractionEnabled(false);
    viewer->SetHeaderReadOnly(true);
    viewer->SetHeaderVisible(false);
 
    if (dungeon_editor_system_) {
      // Allows consistent rendering paths that depend on the editor system, but
      // interaction is still disabled.
      viewer->SetEditorSystem(dungeon_editor_system_.get());
    }
 
    viewer->SetMinecartTrackPanel(minecart_track_editor_panel_);
    viewer->SetProject(dependencies_.project);
  }
 
  return workbench_compare_viewer_.get();
}
 
absl::Status DungeonEditorV2::Undo() {
  // Finalize any in-progress edit before undoing.
  if (pending_undo_.room_id >= 0) {
    FinalizeUndoAction(pending_undo_.room_id);
  }
  if (pending_collision_undo_.room_id >= 0) {
    FinalizeCollisionUndoAction(pending_collision_undo_.room_id);
  }
  if (pending_water_fill_undo_.room_id >= 0) {
    FinalizeWaterFillUndoAction(pending_water_fill_undo_.room_id);
  }
  return undo_manager_.Undo();
}
 
absl::Status DungeonEditorV2::Redo() {
  // Finalize any in-progress edit before redoing.
  if (pending_undo_.room_id >= 0) {
    FinalizeUndoAction(pending_undo_.room_id);
  }
  if (pending_collision_undo_.room_id >= 0) {
    FinalizeCollisionUndoAction(pending_collision_undo_.room_id);
  }
  if (pending_water_fill_undo_.room_id >= 0) {
    FinalizeWaterFillUndoAction(pending_water_fill_undo_.room_id);
  }
  return undo_manager_.Redo();
}
 
absl::Status DungeonEditorV2::Cut() {
  if (auto* viewer = GetViewerForRoom(current_room_id_)) {
    viewer->object_interaction().HandleCopySelected();
    viewer->object_interaction().HandleDeleteSelected();
  }
  return absl::OkStatus();
}
 
absl::Status DungeonEditorV2::Copy() {
  if (auto* viewer = GetViewerForRoom(current_room_id_)) {
    viewer->object_interaction().HandleCopySelected();
  }
  return absl::OkStatus();
}
 
absl::Status DungeonEditorV2::Paste() {
  if (auto* viewer = GetViewerForRoom(current_room_id_)) {
    viewer->object_interaction().HandlePasteObjects();
  }
  return absl::OkStatus();
}
 
void DungeonEditorV2::BeginUndoSnapshot(int room_id) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  // Detect leaked undo snapshots (double-Begin without Finalize).
  if (has_pending_undo_) {
    LOG_ERROR("DungeonEditor",
              "BeginUndoSnapshot called twice without FinalizeUndoAction. "
              "Previous snapshot for room %d is being leaked. Finalizing now.",
              pending_undo_.room_id);
    // Auto-finalize the leaked snapshot to prevent silent state loss.
    if (pending_undo_.room_id >= 0) {
      FinalizeUndoAction(pending_undo_.room_id);
    }
  }
 
  pending_undo_.room_id = room_id;
  pending_undo_.before_objects = rooms_[room_id].GetTileObjects();
  has_pending_undo_ = true;
}
 
void DungeonEditorV2::FinalizeUndoAction(int room_id) {
  if (pending_undo_.room_id < 0 || pending_undo_.room_id != room_id)
    return;
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  auto after_objects = rooms_[room_id].GetTileObjects();
 
  auto action = std::make_unique<DungeonObjectsAction>(
      room_id, std::move(pending_undo_.before_objects),
      std::move(after_objects),
      [this](int rid, const std::vector<zelda3::RoomObject>& objects) {
        RestoreRoomObjects(rid, objects);
      });
  undo_manager_.Push(std::move(action));
 
  pending_undo_.room_id = -1;
  pending_undo_.before_objects.clear();
  has_pending_undo_ = false;
}
 
void DungeonEditorV2::SyncPanelsToRoom(int room_id) {
  // Update object editor card with current viewer
  if (object_selector_panel_) {
    object_selector_panel_->SetCanvasViewerProvider([this]() {
      return GetViewerForRoom(current_room_id_);
    });
    object_selector_panel_->SetCurrentRoom(room_id);
    object_selector_panel_->SetCanvasViewer(GetViewerForRoom(room_id));
  }
  if (object_editor_content_) {
    object_editor_content_->SetCanvasViewerProvider([this]() {
      return GetViewerForRoom(current_room_id_);
    });
    object_editor_content_->SetCurrentRoom(room_id);
    object_editor_content_->SetCanvasViewer(GetViewerForRoom(room_id));
  }
  if (door_editor_panel_) {
    door_editor_panel_->SetCanvasViewerProvider([this]() {
      return GetViewerForRoom(current_room_id_);
    });
    door_editor_panel_->SetCurrentRoom(room_id);
    door_editor_panel_->SetCanvasViewer(GetViewerForRoom(room_id));
  }
 
  // Update sprite and item editor panels with current viewer
  if (sprite_editor_panel_) {
    sprite_editor_panel_->SetCanvasViewer(GetViewerForRoom(room_id));
  }
  if (item_editor_panel_) {
    item_editor_panel_->SetCanvasViewer(GetViewerForRoom(room_id));
  }
  if (custom_collision_panel_) {
    auto* viewer = GetViewerForRoom(room_id);
    custom_collision_panel_->SetCanvasViewer(viewer);
    if (viewer) {
      custom_collision_panel_->SetInteraction(&viewer->object_interaction());
    }
  }
  if (water_fill_panel_) {
    auto* viewer = GetViewerForRoom(room_id);
    water_fill_panel_->SetCanvasViewer(viewer);
    if (viewer) {
      water_fill_panel_->SetInteraction(&viewer->object_interaction());
    }
  }
 
  if (dungeon_settings_panel_) {
    dungeon_settings_panel_->SetCanvasViewer(GetViewerForRoom(room_id));
  }
 
  if (object_tile_editor_panel_) {
    object_tile_editor_panel_->SetCurrentPaletteGroup(current_palette_group_);
  }
 
  if (room_tag_editor_panel_) {
    room_tag_editor_panel_->SetCurrentRoomId(room_id);
  }
 
  if (overlay_manager_panel_) {
    auto* viewer = GetViewerForRoom(room_id);
    if (viewer) {
      OverlayManagerPanel::OverlayState overlay_state;
      overlay_state.show_grid = viewer->mutable_show_grid();
      overlay_state.show_object_bounds = viewer->mutable_show_object_bounds();
      overlay_state.show_coordinate_overlay =
          viewer->mutable_show_coordinate_overlay();
      overlay_state.show_room_debug_info =
          viewer->mutable_show_room_debug_info();
      overlay_state.show_texture_debug = viewer->mutable_show_texture_debug();
      overlay_state.show_layer_info = viewer->mutable_show_layer_info();
      overlay_state.show_minecart_tracks =
          viewer->mutable_show_minecart_tracks();
      overlay_state.show_custom_collision =
          viewer->mutable_show_custom_collision_overlay();
      overlay_state.show_track_collision =
          viewer->mutable_show_track_collision_overlay();
      overlay_state.show_camera_quadrants =
          viewer->mutable_show_camera_quadrant_overlay();
      overlay_state.show_minecart_sprites =
          viewer->mutable_show_minecart_sprite_overlay();
      overlay_state.show_collision_legend =
          viewer->mutable_show_track_collision_legend();
      overlay_manager_panel_->SetState(overlay_state);
    }
  }
}
 
void DungeonEditorV2::ShowRoomPanel(int room_id) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size())) {
    return;
  }
 
  bool already_active = false;
  for (int i = 0; i < active_rooms_.Size; ++i) {
    if (active_rooms_[i] == room_id) {
      already_active = true;
      break;
    }
  }
  if (!already_active) {
    active_rooms_.push_back(room_id);
    room_selector_.set_active_rooms(active_rooms_);
  }
 
  std::string card_id = absl::StrFormat("dungeon.room_%d", room_id);
 
  if (dependencies_.window_manager) {
    if (!dependencies_.window_manager->GetWindowDescriptor(
            dependencies_.window_manager->GetActiveSessionId(), card_id)) {
      std::string room_name = absl::StrFormat(
          "[%03X] %s", room_id, zelda3::GetRoomLabel(room_id).c_str());
      dependencies_.window_manager->RegisterWindow(
          {.card_id = card_id,
           .display_name = room_name,
           .window_title = ICON_MD_GRID_ON " " + room_name,
           .icon = ICON_MD_GRID_ON,
           .category = "Dungeon",
           .shortcut_hint = "",
           .visibility_flag = nullptr,
           .priority = 200 + room_id});
    }
    dependencies_.window_manager->OpenWindow(card_id);
  }
 
  // Create or update the PanelWindow for this room
  if (room_cards_.find(room_id) == room_cards_.end()) {
    std::string base_name = absl::StrFormat(
        "[%03X] %s", room_id, zelda3::GetRoomLabel(room_id).c_str());
    const int slot_id = GetOrCreateRoomPanelSlotId(room_id);
    std::string card_name_str = absl::StrFormat(
        "%s###RoomPanelSlot%d", MakePanelTitle(base_name).c_str(), slot_id);
 
    auto card = std::make_shared<gui::PanelWindow>(card_name_str.c_str(),
                                                   ICON_MD_GRID_ON);
    card->SetDefaultSize(620, 700);
    room_cards_[room_id] = card;
  }
}
 
void DungeonEditorV2::RestoreRoomObjects(
    int room_id, const std::vector<zelda3::RoomObject>& objects) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  auto& room = rooms_[room_id];
  room.SetTileObjects(objects);
  room.RenderRoomGraphics();
}
 
void DungeonEditorV2::BeginCollisionUndoSnapshot(int room_id) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  if (pending_collision_undo_.room_id >= 0) {
    FinalizeCollisionUndoAction(pending_collision_undo_.room_id);
  }
 
  pending_collision_undo_.room_id = room_id;
  pending_collision_undo_.before = rooms_[room_id].custom_collision();
}
 
void DungeonEditorV2::FinalizeCollisionUndoAction(int room_id) {
  if (pending_collision_undo_.room_id < 0 ||
      pending_collision_undo_.room_id != room_id) {
    return;
  }
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  auto after = rooms_[room_id].custom_collision();
  if (pending_collision_undo_.before.has_data == after.has_data &&
      pending_collision_undo_.before.tiles == after.tiles) {
    pending_collision_undo_.room_id = -1;
    pending_collision_undo_.before = {};
    return;
  }
 
  auto action = std::make_unique<DungeonCustomCollisionAction>(
      room_id, std::move(pending_collision_undo_.before), std::move(after),
      [this](int rid, const zelda3::CustomCollisionMap& map) {
        RestoreRoomCustomCollision(rid, map);
      });
  undo_manager_.Push(std::move(action));
 
  pending_collision_undo_.room_id = -1;
  pending_collision_undo_.before = {};
}
 
void DungeonEditorV2::RestoreRoomCustomCollision(
    int room_id, const zelda3::CustomCollisionMap& map) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  auto& room = rooms_[room_id];
  room.custom_collision() = map;
  room.MarkCustomCollisionDirty();
}
 
namespace {
 
WaterFillSnapshot MakeWaterFillSnapshot(const zelda3::Room& room) {
  WaterFillSnapshot snap;
  snap.sram_bit_mask = room.water_fill_sram_bit_mask();
 
  const auto& zone = room.water_fill_zone();
  // Preserve deterministic ordering (ascending offsets) for stable diffs.
  for (size_t i = 0; i < zone.tiles.size(); ++i) {
    if (zone.tiles[i] != 0) {
      snap.offsets.push_back(static_cast<uint16_t>(i));
    }
  }
  return snap;
}
 
}  // namespace
 
void DungeonEditorV2::BeginWaterFillUndoSnapshot(int room_id) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  if (pending_water_fill_undo_.room_id >= 0) {
    FinalizeWaterFillUndoAction(pending_water_fill_undo_.room_id);
  }
 
  pending_water_fill_undo_.room_id = room_id;
  pending_water_fill_undo_.before = MakeWaterFillSnapshot(rooms_[room_id]);
}
 
void DungeonEditorV2::FinalizeWaterFillUndoAction(int room_id) {
  if (pending_water_fill_undo_.room_id < 0 ||
      pending_water_fill_undo_.room_id != room_id) {
    return;
  }
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  auto after = MakeWaterFillSnapshot(rooms_[room_id]);
  if (pending_water_fill_undo_.before.sram_bit_mask == after.sram_bit_mask &&
      pending_water_fill_undo_.before.offsets == after.offsets) {
    pending_water_fill_undo_.room_id = -1;
    pending_water_fill_undo_.before = {};
    return;
  }
 
  auto action = std::make_unique<DungeonWaterFillAction>(
      room_id, std::move(pending_water_fill_undo_.before), std::move(after),
      [this](int rid, const WaterFillSnapshot& snap) {
        RestoreRoomWaterFill(rid, snap);
      });
  undo_manager_.Push(std::move(action));
 
  pending_water_fill_undo_.room_id = -1;
  pending_water_fill_undo_.before = {};
}
 
void DungeonEditorV2::RestoreRoomWaterFill(int room_id,
                                           const WaterFillSnapshot& snap) {
  if (room_id < 0 || room_id >= static_cast<int>(rooms_.size()))
    return;
 
  auto& room = rooms_[room_id];
  room.ClearWaterFillZone();
  room.set_water_fill_sram_bit_mask(snap.sram_bit_mask);
  for (uint16_t off : snap.offsets) {
    const int x = static_cast<int>(off % 64);
    const int y = static_cast<int>(off / 64);
    room.SetWaterFillTile(x, y, /*filled=*/true);
  }
  room.MarkWaterFillDirty();
}
 
}  // namespace yaze::editor