/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/CircularQueue.h>
#include <AK/NonnullRefPtrVector.h>
#include <LibGUI/Widget.h>

class SnakeGame : public GUI::Widget {
    C_OBJECT(SnakeGame)
public:
    virtual ~SnakeGame() override;

    void reset();

private:
    SnakeGame();
    virtual void paint_event(GUI::PaintEvent&) override;
    virtual void keydown_event(GUI::KeyEvent&) override;
    virtual void timer_event(Core::TimerEvent&) override;

    struct Coordinate {
        int row { 0 };
        int column { 0 };

        bool operator==(const Coordinate& other) const
        {
            return row == other.row && column == other.column;
        }
    };

    struct Velocity {
        int vertical { 0 };
        int horizontal { 0 };
    };

    void game_over();
    void spawn_fruit();
    bool is_available(const Coordinate&);
    void queue_velocity(int v, int h);
    const Velocity& last_velocity() const;
    Gfx::IntRect cell_rect(const Coordinate&) const;
    Gfx::IntRect score_rect() const;
    Gfx::IntRect high_score_rect() const;

    int m_rows { 20 };
    int m_columns { 20 };

    Velocity m_velocity { 0, 1 };
    Velocity m_last_velocity { 0, 1 };

    CircularQueue<Velocity, 10> m_velocity_queue;

    Coordinate m_head;
    Vector<Coordinate> m_tail;

    Coordinate m_fruit;
    int m_fruit_type { 0 };

    size_t m_length { 0 };
    unsigned m_score { 0 };
    String m_score_text;
    unsigned m_high_score { 0 };
    String m_high_score_text;

    NonnullRefPtrVector<Gfx::Bitmap> m_fruit_bitmaps;
};