#include<graphics.h>
#include<stdio.h>
#include<stdlib.h>
#define screensize 1000
#define up 0
#define down 1
#define left 2
#define right 3
#define foodnumber 2
int snakelong = 5;
char score = 0;
int foodx = 0;
int foody = 0;
bool gameover = false;
int sd = down;
int x[64] = { 0,0,0 },y[64] = { 2,1,0 };

void drawxy(int x,int y)
{
	int q = screensize / 20;
	rectangle(x * q, y * q, x * q + q, y * q + q);
}
void drawxy_(int x, int y)
{
	int q = screensize / 20;
	fillrectangle(x * q, y * q, x * q + q, y * q + q);
}
void creatfood() {
		foodx= rand() % 20;
		foody = rand() % 20;
	for (int i = 0; i < snakelong; i++)
	{
		while (foodx == x[i] && foody == x[i])
		{
			foodx = rand() % 20;
			foody = rand() % 20;
		}
	}
}
void initscreen() {
	for (int  i = 0; i < 20; i++)
	{
		for (int j = 0; j < 20; j++) {
			drawxy(i, j);
		}
	}
}
void drawsnake() {
	setfillcolor(BLUE);
	for (int i = 0; i < snakelong; i++)
	{
		drawxy_(x[i], y[i]);
	}
	setfillcolor(RED);
	drawxy_(foodx, foody);
}
void drawscore() {
	char score_[6] = { 48 + score / 100,48 + score % 100 / 10,48 + score % 10 ,0,0,0};
	settextcolor(WHITE);
	settextstyle(50, 0, "����");
	setbkmode(TRANSPARENT);
	outtextxy(1010, 0, "SCORE:");
	outtextxy(1010, 50, score_);
}
void drawing() {
	cleardevice();
	BeginBatchDraw();
	initscreen();
	drawsnake();
	drawscore();
	EndBatchDraw();
}
void keyborad() {
	if (GetAsyncKeyState(VK_UP))//�����¼�
	{
		//printf("UP has been pressed\n");
		if (sd!=down)
		{
			sd = up;
		}	
	}
	if (GetAsyncKeyState(VK_DOWN))
	{
		 //printf("DOWN has been pressed\n");
		 if (sd != up) {
			 sd = down;
		 }
	}
	if (GetAsyncKeyState(VK_LEFT))
	{
		 //printf("LEFT has been pressed\n");	
		 if (sd != right) {
			 sd = left;
		 }
	}
	if (GetAsyncKeyState(VK_RIGHT))
	{
		 //printf("RIGHT has been pressed\n");		
		 if (sd != left) {
			 sd = right;
		 }
	}
}
void over() {
	printf("gameover\n");
	cleardevice();
	IMAGE img;
	loadimage(&img, "./cai.png",1200,1000);// ./��ʾ��  ǰ�ļ��У�../��ʾ��һ��Ŀ¼
	putimage(0, 0, &img);
	Sleep(3000);
	closegraph();
	HWND hmd = GetHWnd();
	int isok = MessageBox(hmd, "���ȷ�Ͽ�ʼ�˳�", "GAME OVER", MB_OK);
	if (isok == IDOK) {

	}
}
void deadcheck() {
	for (int i = 0; i < snakelong; i++)
	{
		switch (sd)
		{
		case up:
			if (x[i] == x[0] && y[i] == (y[0] - 1)) {
				gameover = true;
			}
			break;
		case down:
			if (x[i] == x[0] && y[i] == (y[0] + 1)) {
				gameover = true;
			}
			break;
		case left:
			if (y[i] == y[0] && x[i] == (x[i] - 1)) {
				gameover = true;
			}
			break;
		case right:
			if (y[i] == y[0] && x[i] == (x[i] + 1)) {
				gameover = true;
			}
		  break;
		}
	}
	if (gameover==true)
	{
		over();
	}
}
void snakerun() {
	for (int i = snakelong+3; i>0; i--)
	{
		x[i ] = x[i-1];
		y[i] = y[i-1];
	}
	switch (sd)
	{
	case up:y[0]--; break;
	case down:y[0]++; break;
	case left:x[0]--; break;
	case right:x[0]++; break;
	}
	if (x[0]<0)
	{
		x[0] += 20;
	}
	if (x[0]>19)
	{
		x[0] -= 20;
	}
	if (y[0] < 0)
	{
		y[0] += 20;
	}
	if (y[0] > 19)
	{
		y[0] -= 20;
	}
	if (x[0]==foodx&&y[0]==foody)
	{
		snakelong+=3;
		creatfood();
		score++;
		printf("%d\n",score);
	}
}
void screenchange() {
	HWND hnd = GetHWnd();
	SetWindowText(hnd, "̰����");//�޸Ĵ�������
	int isok = MessageBox(hnd, "���ȷ�Ͽ�ʼ��Ϸ", "̰���� by lyy", MB_OK);
}
int main() {
	initgraph(screensize+200, screensize, NOMINIMIZE);
	screenchange();
	creatfood();
	while (!gameover)
	{
		drawing();
		Sleep(500);
		keyborad();
		deadcheck();
		snakerun();
		//if (gameover == true) break;
		
	}
	return 0;
}