#pragma once

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

#include <QPoint>
#include <QWidget>

#include "entt/entity/entity.hpp"

#include "Building.h"
#include "BuildingId.h"
#include "EntitySelectedEvent.h"
#include "EventHandler.h"
#include "GameConfig.h"
#include "RecipesConfig.h"
#include "ShipLayout.h"
#include "ShipsConfig.h"
#include "Tick.h"
#include "TickAdvancedEvent.h"

class Simulation;
class ShipLayoutPreview;
class ShipStatsPanel;
class QLabel;
class QComboBox;
class QListWidget;
class QPushButton;
class QVBoxLayout;

class SelectedBuildingPanel : public QWidget,
                               public CombinedEventHandler<TickAdvancedEvent, EntitySelectedEvent>
{
    Q_OBJECT

public:
    SelectedBuildingPanel(Simulation* sim, const GameConfig* config,
                          QWidget* parent = nullptr);
    ~SelectedBuildingPanel() override;

signals:
    void layoutDialogRequested(BuildingId shipyardId);

public slots:
    void onSelectionChanged(const std::vector<BuildingId>& ids);

private:
    void handleEvent(std::shared_ptr<const TickAdvancedEvent> event) override;
    void handleEvent(std::shared_ptr<const EntitySelectedEvent> event) override;

private slots:
    void onRecipeChanged(int comboIndex);
    void onClearBelt();
    void onSplitterFilterChanged();

private:
    void rebuild();
    void clearContent();
    void buildEmpty();
    void buildSingle(BuildingId id);
    void buildMulti(const std::vector<BuildingId>& ids);
    void refreshBuffers(const Building* b);
    void buildSplitterFilters(QPoint splitterTile);
    const RecipeDef* findRecipe(const Building* b) const;
    const ShipDef*   findShipDef(const std::string& id) const;
    std::vector<std::string> allItemIds() const;

    Simulation*        m_sim;
    const GameConfig*  m_config;
    std::vector<BuildingId> m_selectedBuildingIds;

    QVBoxLayout* m_layout;
    QLabel*      m_titleLabel;
    QComboBox*   m_recipeCombo;
    QPushButton* m_clearBeltBtn;
    QLabel*      m_filterALabel;
    QListWidget* m_filterAList;
    QLabel*      m_filterBLabel;
    QListWidget* m_filterBList;
    QLabel*      m_buffersLabel;

    ShipLayoutPreview* m_layoutPreview;
    QPushButton*       m_configureLayoutBtn;

    BuildingId     m_singleBuildingId;
    QPoint       m_splitterTile;
    std::string  m_currentRecipeId;

    std::optional<entt::entity> m_selectedEntity;
    ShipStatsPanel* m_entityStatsPanel;
    QLabel*         m_entityTitleLabel;
    QLabel*         m_stationStatsLabel;

    void buildEntityShip(entt::entity entity);
    void buildEntityStation(entt::entity entity);
    void refreshEntityStats();
    void clearEntityDisplay();
};