#include<iostream>
#include<conio.h>
#include<thread>
using namespace std;
using namespace std::literals;
int map[20][20], snake[1000][3], pts, length, fx;
auto speed=1.0s;
bool quit;
inline void sleep(auto time) {
	this_thread::sleep_for(time);
}

struct Game {
	static void gameover()
	{
		quit = true;
		sleep(0.5s);
		system("cls");
		cout << "你死了，最终得到了" << pts << "分，按F重新开始游戏";
		char key = 0;
		while (1)
		{
			if (_kbhit())
			{
				key = _getch();
				if (key == 'f' or key == 'F')
				{
					break;
				}
			}
		}
		initialize();
	}
	static void move()
	{

		while (1)
		{
			if (quit)return;
			sleep(speed);
			int lastx = snake[length][1];
			int lasty = snake[length][2];
			if (length >= 2)
			{
				map[lastx][lasty] = 0;
				map[snake[1][1]][snake[1][2]] = 1;

			}
			else
			{
				map[snake[1][1]][snake[1][2]] = 0;
			}
			for (int i = length; i >= 2; i--)
			{
				snake[i][1] = snake[i - 1][1];
				snake[i][2] = snake[i - 1][2];
			}
			bool crack = false;
			if (fx == 1)
			{
				snake[1][1]--;
			}
			if (fx == 2)
			{
				snake[1][1]++;
			}
			if (fx == 3)
			{
				snake[1][2]--;
			}
			if (fx == 4)
			{
				snake[1][2]++;
			}
			int x = snake[1][1];
			int y = snake[1][2];
			if (x < 1 or map[x][y] == 1 or y < 1 or x > 15 or y > 15)
			{
				gameover();
			}
			else
			{
				if (map[x][y] == 3)
				{
					int bs = 1;
					if (speed == 0.5s)bs = 2;
					if (speed == 0.3s)bs = 3;
					if (speed == 0.1s)bs = 5;
					pts=pts+bs;
					length++;
					snake[length][1] = lastx;
					snake[length][2] = lasty;
					map[lastx][lasty] = 1;
					fruit();
				}
				map[x][y] = 2;
			}
		}
	}
	static void display()
	{

		while (1)
		{
			if (quit)return;
			cout << "分数:" << pts << endl;
			for (int i = 1; i <= 16; i++)cout << "--";
			cout << endl;
			for (int i = 1; i <= 15; i++)
			{
				for (int j = 1; j <= 15; j++)
				{
					if (map[i][j] == 0)cout << "  ";
					if (map[i][j] == 1)cout << "██";
					if (map[i][j] == 2)
					{
						if (fx == 1)cout << "↑ ";
						if (fx == 2)cout << "↓ ";
						if (fx == 3)cout << "← ";
						if (fx == 4)cout << "→ ";
					}
					if (map[i][j] == 3)cout << "＃";
				}
				cout << "|" << endl;
			}
			for (int i = 1; i <= 16; i++)cout << "--";
			cout << endl<<"移动：WASD/↑←↓→";
			cout << endl << "重新开始：一头创死";
			string temp = "";
			if (speed == 1s)temp = "1";
			if (speed == 0.5s)temp = "0.5";
			if (speed == 0.3s)temp = "0.3";
			if (speed == 0.1s)temp = "0.1";
			cout << endl << "当前速度：" << temp << "s/格，调整速度请按T键" << endl;
			sleep(0.1s);
			system("cls");
		}
	}
	static void monitor()
	{

		char key = 0;
		while (1)
		{
			if (quit)return;
			key = 0;
			if (_kbhit())
			{
				key = _getch();
				int ff = 0;
				if (snake[2][1] == snake[1][1] - 1)ff = 1;
				if (snake[2][1] == snake[1][1] + 1)ff = 2;
				if (snake[2][2] == snake[1][2] - 1)ff = 3;
				if (snake[2][2] == snake[1][2] + 1)ff = 4;
				int temp = fx;
				if (key == 72 or key == 'w' or key == 'W')fx = 1;
				else if (key == 75 or key == 'a' or key == 'A')fx = 3;
				else if (key == 77 or key == 'd' or key == 'D')fx = 4;
				else if (key == 80 or key == 's' or key == 'S')fx = 2;
				else if (key == 't' or key == 'T')
				{
					if (speed == 1s)speed = 0.5s;
					else if (speed == 0.5s)speed = 0.3s;
					else if (speed == 0.3s)speed = 0.1s;
					else speed = 1s;
				}
				if (fx == ff)fx = temp;
			}
		}
	}
	static void fruit()
	{
		int x = 0;
		int y = 0;
		while (map[x][y] == 0)
		{
			x = rand() % 15 + 1;
			y = rand() % 15 + 1;
			if (map[x][y] == 0)
			{
				map[x][y] = 3;
				break;
			}
			x = 0;
			y = 0;
		}
	}
	static void initialize()
	{
		srand(time(0));
		speed = 1s;
		pts = 0;
		quit = false;
		int xx = 0;
		int yy = 0;
		for (int i = 1; i <= 15; i++)
			for (int j = 1; j <= 15; j++)map[i][j] = 0;
		length = 1;
		xx = rand() % 12 + 2;
		yy = rand() % 12 + 2;
		snake[1][1] = xx;
		snake[1][2] = yy;
		fx = rand() % 4 + 1;
		map[xx][yy] = 2;
		fruit();
		thread t1(display);
		thread t2(monitor);
		thread t3(move);
		t1.join();
		t2.join();
		t3.join();
	}
};


int main()
{
	Game::initialize();
}