#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
#include<unistd.h>
#include<fcntl.h>
#include<termios.h>
int kbhit(void);
char getch(void);


/*int main(int argc, char ** argv){
  printf("wasd or arrows to control snake, q to quit, p to pause game.");
    while(1){
      getInput();
    } 
}*/

/** getInput gets the userinput and reacts to input of w,a,s,d, arrow keys, p or q 
  * utilises getch() and kbhit, no parameters, no returns
  */
void getInput(){
  if(kbhit()){  
    char key= getch();
    if(key == '\033'){
      getch();
      char key = getch();
      switch(key){
        case 'A': 
          printf("up");
          break;
        case 'B':
          printf("down");
          break;
        case 'C':
          printf("right");
          break;
        case 'D':
          printf("left");
          break;
      }
    }
    else{
    
      switch(key){
        case 'w':
          printf("W");
          break;
        case 'a':
          printf("A");
          break;
        case 's':
          printf("S");
          break;
        case 'd':
          printf("D");
          break;
        case 'q':
          printf("quit");
          break;
        case 'p':
          printf("\033[31mgame paused, p to continue");
          printf("\033[0m");
          pause();
          printf("\033[32mgame continued");
          printf("\033[0m");
          break;
      }
    }

  }
}

/** getTInput with parameters to test if working correctly
  * returns char, parameter: char
  */
char getTInput(char key){  
      if(key == '\033'){
        return 'ar';
      }
      else{
        switch(key){
           case 'w':
            return 'w';
          case 'a':
            return 'a';
          case 's':
            return 's';
          case 'd':
            return 'd';
          case 'q':
            return 'q';
          case 'p':
            return 'p';
      }
       
      }
    

  }


/** pauses the game until p is pressed again
  * no parameters, no returns 
  */
pause(){
  while(getch()!='p'){
    sleep(0.10);
  }
}



//khbit und getch aus dem Internet
int kbhit(void){
  struct termios oldt, newt;
  int ch;
  int oldf;

  tcgetattr(STDIN_FILENO, &oldt);
  newt = oldt;
  newt.c_lflag &= ~(ICANON | ECHO);
  tcsetattr(STDIN_FILENO, TCSANOW, &newt);
  oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
  fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);

  ch = getchar();

  tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
  fcntl(STDIN_FILENO, F_SETFL, oldf);

  if(ch != EOF)
  {
    ungetc(ch, stdin);
    return 1;
  }

  return 0;
}

char getch(void)
{
    char c;
    system("stty raw");
    c= getchar();
    system("stty sane");
    return(c);
}