#pragma once

#include <memory>
#include <optional>
#include <string>
#include <vector>

#include <QWidget>

#include "BlueprintSaveRequestedEvent.h"
#include "BlueprintSelectionRequestedEvent.h"
#include "BuildingId.h"
#include "EscapeMenuRequestedEvent.h"
#include "EventHandler.h"
#include "GameConfig.h"
#include "GameOverEvent.h"
#include "LayoutDialogRequestedEvent.h"
#include "ModalDimOverlay.h"
#include "WinEvent.h"
#include "RecipeSelectionRequestedEvent.h"
#include "SchematicChoicesAvailableEvent.h"
#include "ShipLayout.h"
#include "ShipLayoutBlueprint.h"
#include "Tick.h"
#include "VisualsConfig.h"

struct ParsedReplay;
class Simulation;
class GameWorldView;
class HeaderBar;
class SelectionPanel;
class BuildButtonBar;
class BlueprintLibrary;
class BuildingIconCache;
class ItemIconCache;
class QCloseEvent;
class QResizeEvent;

class MainWindow : public QWidget,
                   public CombinedEventHandler<SchematicChoicesAvailableEvent,
                                               GameOverEvent,
                                               WinEvent,
                                               EscapeMenuRequestedEvent,
                                               LayoutDialogRequestedEvent,
                                               RecipeSelectionRequestedEvent,
                                               BlueprintSaveRequestedEvent,
                                               BlueprintSelectionRequestedEvent>
{
    Q_OBJECT

public:
    MainWindow(Simulation* sim, const std::string& configDir,
               std::shared_ptr<ParsedReplay> replay = nullptr, QWidget* parent = nullptr);
    ~MainWindow() override;

protected:
    void resizeEvent(QResizeEvent* event) override;
    void closeEvent(QCloseEvent* event) override;

private:
    void handleEvent(std::shared_ptr<const SchematicChoicesAvailableEvent> event) override;
    void handleEvent(std::shared_ptr<const GameOverEvent> event) override;
    void handleEvent(std::shared_ptr<const WinEvent> event) override;
    void handleEvent(std::shared_ptr<const EscapeMenuRequestedEvent> event) override;
    void handleEvent(std::shared_ptr<const LayoutDialogRequestedEvent> event) override;
    void handleEvent(std::shared_ptr<const RecipeSelectionRequestedEvent> event) override;
    void handleEvent(std::shared_ptr<const BlueprintSaveRequestedEvent> event) override;
    void handleEvent(std::shared_ptr<const BlueprintSelectionRequestedEvent> event) override;

    // Reloads the game config and visuals.toml from disk (REQ-CFG-RELOAD), shared
    // by every restart path. On success the reloaded visuals are applied to this
    // window and the fresh GameConfig is returned; on failure a modal error dialog
    // is shown and std::nullopt is returned, leaving the window state untouched.
    std::optional<GameConfig> reloadConfig();

    // Opens the shipyard layout configuration dialog for the given schematic and
    // current layout, applying the result via SetShipLayoutCommand (REQ-MOD-UI-DIALOG).
    void openShipLayoutDialog(BuildingId shipyardId,
                              const std::string& schematicId,
                              const ShipLayoutConfig& currentLayout);

    // Runs the blueprint selection dialog and enters placement mode for whatever the
    // player picked (REQ-UI-BLUEPRINT-DIALOG). Holds no pause or dim scope of its own:
    // both callers already hold theirs, which is what keeps the dim continuous when a
    // confirmed save hands straight over to this dialog (REQ-UI-MODAL-DIM).
    void showBlueprintSelectionDialog();
    void layoutPanels();

private:
    std::string            m_configDir;
    VisualsConfig          m_visuals;
    Simulation*            m_sim;
    // One per-item icon cache for the whole window (REQ-UI-ITEM-ICON): the header,
    // build bar, world view, and recipe dialog all rasterize the same SVGs.
    std::unique_ptr<ItemIconCache> m_itemIcons;
    // Likewise one per-building chip cache (REQ-UI-BUILD-ICON), shared by the build bar
    // and the selection panel's card headers (REQ-UI-SELECTION-CARD).
    std::unique_ptr<BuildingIconCache> m_buildingIcons;
    GameWorldView*         m_gameWorldView;
    HeaderBar*             m_headerBar;
    SelectionPanel*        m_selectionPanel;
    BuildButtonBar*        m_buildButtonBar;
    // The saved blueprints themselves; they have no widget of their own any more and
    // are reached through the two modal dialogs (REQ-UI-BLUEPRINT-DIALOG).
    std::unique_ptr<BlueprintLibrary> m_blueprintLibrary;
    ModalDimOverlay*       m_dimOverlay = nullptr;

    std::vector<ShipLayoutBlueprint> m_layoutBlueprints;
    std::shared_ptr<ParsedReplay>    m_replay;  // non-null => view-only playback
};