#pragma once

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

#include <QWidget>

#include "ModulesConfig.h"
#include "ShipLayout.h"

class ShipLayoutPreview : public QWidget
{
    Q_OBJECT

public:
    explicit ShipLayoutPreview(QWidget* parent = nullptr);

    void setShipAndLayout(const std::vector<std::string>& shipLayout,
                          const ShipLayoutConfig& layout,
                          const ModulesConfig* modules);
    void clear();

    // Shows an empty placeholder box (no ship layout) so the preview stays
    // visible while no schematic is selected (REQ-MOD-UI-PREVIEW).
    void showPlaceholder();

protected:
    void paintEvent(QPaintEvent* event) override;

private:
    struct CellInfo
    {
        bool buildable;
        std::optional<int> moduleIndex;  // nullopt if empty
    };

    std::vector<std::vector<CellInfo>> m_grid;
    std::vector<PlacedModule> m_placedModules;
    const ModulesConfig* m_modules;
    int m_rows;
    int m_cols;
    bool m_placeholder = false;
};