#ifndef PUZZLE_HPP_SENTRY
#define PUZZLE_HPP_SENTRY

#include <FL/Enumerations.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_PNG_Image.H>
#include <string>
#include <vector>
#include <memory>

enum {
    puzzle_pieces       = 9, // including empty puzzle
    puzzles_per_side    = 3,
    puzzle_size         = 100,
    spacing             = 5
};

class Puzzle : public Fl_Button{
private:
    unsigned char sequence_number{};
    // Path for file access error handling (ERR_FILE_ACCESS)
    std::string path;
    Fl_PNG_Image *stored_img_pointer;
public:
    Puzzle(int x, int y)
        : Fl_Button(x, y, puzzle_size, puzzle_size),
        stored_img_pointer(nullptr)
    {
    }
    ~Puzzle() { delete stored_img_pointer; }
    friend class GameParams;
    friend class PuzzleGame;
    friend class ASearch;
};

class GameParams {
public:
    struct coordinates {
        int x, y;
        bool operator==(const coordinates& v) const {
            return this->x == v.x && this->y == v.y;
        }
    };
private:
    static GameParams *instance;
    coordinates standard_puzzle_coordinates[puzzle_pieces];
    char free_puzzles[puzzle_pieces];
    coordinates empty_box;
    std::vector<std::unique_ptr<Puzzle>> puzzles;
    Fl_Window *win;
    // True while A* is solving the puzzle; blocks new game and solving again
    bool is_a_star_active = false;
    // selecting the current directory where the user image is stored
    std::string cur_directory;

    GameParams(Fl_Window *a_win = nullptr)
        : win(a_win)
        {}
    void CalculateStandardPuzzlePos();
    void ResetFreePuzzles();
    void ResetAStarActive() { is_a_star_active = false; }
    void SetAStarActive() { is_a_star_active = true; }
    void NextUntestedPuzzles();
    bool IsSolvability();
    void CreateNewPuzzles();
    void SelectRandomPicture();
    Fl_PNG_Image *LoadPictureParts(std::unique_ptr<Puzzle>& tmp_puzzle);
    void SetXYEmptyBox(int x, int y) { empty_box.x = x; empty_box. y = y; }
    coordinates GetXYEmptyBox() { return empty_box; }
public:
    bool GetAStarActive() { return is_a_star_active; }
    static GameParams *SetUpParams(Fl_Window *win) {
        if(instance)
            return instance;
        GameParams *gi = new GameParams(win);
        gi->CalculateStandardPuzzlePos();
        return gi;
    }
    friend class PuzzleGame;
    friend class ASearch;
    friend void press_button_callback(Fl_Widget*, void*);
    friend void solve_problem_callback(Fl_Widget*, void*);
};

#endif