#pragma once

#include <string>
#include <deque>
#include <array>

constexpr int ROW = 11;
constexpr int COL = 11;

enum class Direction {
	UP, DOWN, LEFT, RIGHT
};

struct vec2 {
	int x, y;
	vec2(int x, int y) : x(x), y(y) {}
	void set(int _x, int _y) { x = _x; y = _y; }
	auto operator <=> (const vec2&) const = default;
};

struct Window {
	std::array<std::array<char, COL>, ROW> view;
	void draw_display();
	void update_display(vec2 &head, vec2 &fruit, std::deque<vec2> &buf);
};

class Engine {
public:
	Engine();
	~Engine();
	void run();

private:
	Window win;
	std::deque<vec2> tail;
	std::string status;
	vec2 head { COL / 2, ROW / 2 };
	vec2 fruit { rand() % COL, rand() % ROW };
	vec2 prev_head { head.x, head.y };
	Direction dir = Direction::RIGHT;
	unsigned int m_score = 0;
	bool process_input();
	void determine_index_zero_pos();
	void move_tail_indicies();
	void add_tail_and_respawn_fruit();
	bool exit_summary();
};