#include <time.h>
#include <stdlib.h>
#include <glut.h>
#include <windows.h>
#include <iostream>
#include <conio.h>
#include <stdio.h>
#include <stdarg.h>
#include <glaux.h>
#include <glu.h>
#include <math.h>

using namespace std;

int i, j, q, g,tlen,knopka;
int N=40, M=30, t=50;
int Scale=25;
int ap=1, bo=1,ap2=0,bo2=0;

int w = Scale*N+2;
int h = Scale*M+60;
int sc,ts=4,trata=0; //score, наибольшая длина, флаг для завершения игры после выхода за краай
int dir,num=4;
float spds=100, spd=100, samp=0.5; // начальный множитель скорости, изменяющийся
int sc2;
struct 
{ int x;
  int y;}  s[1000];
class Fructs
{ 
public:
	int x,y;

void New()
    {  x=rand() % N;
        y=rand() % M;   }
	
void DrawApple()
   {   glColor3f(0.0,1.0,0.0);
       glRectf((x+0.15)*Scale,(y+0.15)*Scale,(x+0.85)*Scale,(y+0.85)*Scale); }

} m[1000];
class Bombs
{
public:
	int x, y;
void New1()
    { x=rand() %N;
       y=rand() %M;  }

void DrawBomb()
{ glColor3f(1.0, 0.0, 0.0);
  glRectf((x+0.15)*Scale,(y+0.15)*Scale,(x+0.85)*Scale,(y+0.85)*Scale); }
} a[1000];
 void DrawSnake()
 {  
  glColor3f(1.0,1.0,1.0);
  for (int i=0;i<num;i++)
    {glRectf(s[i].x*Scale, s[i].y*Scale, (s[i].x+0.9)*Scale, (s[i].y+0.9)*Scale); }
 }

 void Tick()
 {
    for (int i=num;i>0;--i)
	 {s[i].x=s[i-1].x;
	 s[i].y=s[i-1].y;}

    if (dir==0) s[0].y+=1;      
    if (dir==1) s[0].x-=1;        
    if (dir==2) s[0].x+=1;         
    if (dir==3) s[0].y-=1;         

  for (int i=0;i<ap;i++)
    if ((s[0].x==m[i].x) && (s[0].y==m[i].y)) 
	{num++; m[i].New(); sc++; if (num>ts){ts=num;}}

  for (int q=0;q<bo;q++)
    if ((s[0].x==a[q].x) && (s[0].y==a[q].y)) 
      {num--; a[q].New1();}

	ap=sc/4+1;
	bo=sc/7+sc2;

	if (ap>ap2) {ap2=ap;m[ap-1].New();}
	if (bo>bo2) {bo2=bo;a[bo-1].New1();}

	if (s[0].x>N || s[0].x<0 || s[0].y>M || s[0].y<0) {if(num<3) {trata=1;}}

	if (s[0].x>N) dir=1;  if (s[0].x<0) dir=2;
  if (s[0].y>M) dir=3;  if (s[0].y<0) dir=0;
 
 for (int i=1;i<num;i++)
  if (s[0].x==s[i].x && s[0].y==s[i].y)  num=i;
 }
void DrawField()
  {
   glColor3f(0.4,0.4,0.7);
   glBegin(GL_LINES);
    for (int i=0; i<w; i+=Scale) 
      {glVertex2f(i,0); glVertex2f(i,h+Scale);}
    for (int j=0; j<h; j+=Scale)  
      {glVertex2f(0,j); glVertex2f(w+Scale,j);}
    glEnd();
	
	glColor3f (1.0, 1.0, 1.0); 
	glRectf(0, h+40, w+25, h-35); 
	glFlush();
}
void display() {
	 
	glClear(GL_COLOR_BUFFER_BIT);
    DrawField();

    
   for (int i=0;i<ap;i++)
     m[i].DrawApple();
   
   for (int q=0;q<bo;q++)
     a[q].DrawBomb();

   DrawSnake(); 

   glFlush();
   glutSwapBuffers();
}

void KeyboardEvent(int key, int a, int b)
{   
    switch(key)
    {
        case 101 : 	dir=0; break;
        case 102 :  dir=2; break;
        case 100 :  dir=1; break;
        case 103 :  dir=3; break;
     }
}

void timer(int = 0)
{
  display();

  Tick();
  
  spd=spds+((spds/100)*((sc+num)*samp)); //sc * кол-во яблок *, num * кол-во сегментов *.
  t=100/(spd/100);

  if (num<1||trata==1){	glutDestroyWindow(1); system("cls");
                printf (" * * * *   * * *  * * * * *  * * *    * * *  *     *  * * * *  *     *   * * * \n");
				printf (" *     *  *     *     *      *    * *     *  *     *  *        *     *  *     *\n");
				printf (" *     *  *     *     *      *    * *     *  * * * *  * * *    * * * *  *     *\n");
				printf (" *     *  *     *     *      * * *  * * * *        *  *        *     *  *     *\n");
				printf (" *     *   * * *      *      *      *     *        *  * * * *  *     *   * * * \n");
                printf ("_______________________________________________________________________________\n");
				cout << "Your score is " << sc << ".\n" << "Top length is " << ts << ".\nCurrent speed multiplier is " << spd/spds*100 << "\n"
			    << "_______________________________________________________________________________\n" << "Game by HEY NIGGA TEAM";
				getch();
				exit (EXIT_FAILURE);
			}
 glutTimerFunc(t,timer,0);
}

int main(int argc, char **argv) {
                printf ("                                             * *                               \n");
                printf ("               * * *    *     *  * * * *   *     *  *   *    * * *             \n");
				printf ("                    *   * * * *  *         *   * *  *  *   *     *             \n");
				printf ("                 * *    *  *  *  * * *     *  *  *  * *    *     *             \n");
				printf ("                    *   *     *  *         * *   *  *  *   * * * *             \n");
				printf ("               * * *    *     *  * * * *   *     *  *   *  *     *             \n");
                printf ("_______________________________________________________________________________\n");
                printf ("To start the game press SPACE.\nTo exit the game, press ESC\n");

while(!tlen){
	knopka=getch();
	if(knopka==32){tlen=1;system("cls"); cout << "GAME STARTING";}
	if(knopka==27){tlen=0;system("cls"); exit (EXIT_FAILURE);}


}

	srand(time(0));
	
	for (int i=0;i<ap;i++)
		m[i].New();

	for (int q=0;q<bo;q++)
		a[q].New1();
	
	 s[i].x=30;
	 s[i].y=15;


glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB );
glutInitWindowSize (w, h);
glutCreateWindow ("Snake"); 
glClearColor(0.0,0.0,0.0,1.0);  //цвет фона
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0,w+20,0,h+20);

glutDisplayFunc (display);
glutSpecialFunc(KeyboardEvent);
glutTimerFunc(10,timer,1);

glutMainLoop();
}