/*windows copy*/

#include <stdio.h>
#include <stdlib.h>

#include <SDL.h>
#include <SDL_video.h>

SDL_Surface *grid;
SDL_Surface *image,*enemy;
SDL_Surface *screen;
SDL_Surface *takespace;
SDL_Surface *wall;

int xpos=29,ypos=26;
int wallx,wally;
int ex=29,ey=51;
int svx=6,svy=11;//enemy's velocity
int wallgrid[26][23];

int InitImages()
{
  //takespace = SDL_LoadBMP("takespace.bmp");
  grid = SDL_LoadBMP("data/pics/battlegrid.bmp");
  image = SDL_LoadBMP("data/pics/player.bmp");
  enemy = SDL_LoadBMP("data/pics/enemy.bmp");
  wall = SDL_LoadBMP("data/pics/wall.bmp");
  if(!image ||!grid ||!enemy ||!wall)
    {
     fprintf(stderr,"error loading bitmaps\n");
     //exit(1);
    }
  return 0;
}

void DrawIMG(SDL_Surface *img, int x, int y)
{
  SDL_Rect dest;
  dest.x = x;
  dest.y = y;
  SDL_BlitSurface(img, NULL, screen, &dest);
}

void DrawIMG(SDL_Surface *img, int x, int y, int w, int h, int x2, int y2)
{
  SDL_Rect dest;
  dest.x = x;
  dest.y = y;
  SDL_Rect dest2;
  dest2.x = x2;
  dest2.y = y2;
  dest2.w = w;
  dest2.h = h;
  SDL_BlitSurface(img, &dest2, screen, &dest);
}

void DrawIMG(SDL_Surface *img, int x, int y,SDL_Surface *img2)
{
  SDL_Rect dest;
  dest.x = x;
  dest.y = y;
  SDL_BlitSurface(img, NULL, img2, &dest);
}

void DrawBG()
{
  DrawIMG(grid, 0, 0);
}

void DrawScene(int x, int y, SDL_Surface *scrn)
{
  DrawIMG(grid, x-30, y-30, 90, 90, x-30, y-30);
  DrawIMG(scrn, x, y);

  SDL_Flip(screen);
}

int main(int argc, char *argv[])
{
  Uint8 *keys;

  if ( SDL_Init(SDL_INIT_AUDIO|SDL_INIT_VIDEO) < 0 )
  {
    printf("Unable to init SDL: %s\n", SDL_GetError());
    exit(1);
  }
  atexit(SDL_Quit);

  screen=SDL_SetVideoMode(800,600,32, SDL_HWSURFACE|SDL_DOUBLEBUF|SDL_RESIZABLE|SDL_ANYFORMAT);
  if ( screen == NULL )
  {
    fprintf(stderr,"Unable to set 800x600 video: %s\n", SDL_GetError());
    exit(1);
  }

  SDL_ShowCursor(0);//cursor is annoying
  InitImages();//call up function InitImages from the global space which loads the images.
  DrawBG();//draw the background

  int done=0;
  
  while(done == 0)
  {
    SDL_Event event;

    while ( SDL_PollEvent(&event) )
    {
   
    switch(event.type)
      {
       case SDL_QUIT:
         done = 1;
	 break;
       
       case SDL_KEYDOWN://|| forward == LOCAL_KEY_ESCAPE
         if ( event.key.keysym.sym == SDLK_ESCAPE  ) { done = 1; }
	 break;
      }
  
      
    }//end while loop
    
    //I would use a case here but switch complains that Uints arent integers and it doesnt work even with the conversion specifier.

    keys = SDL_GetKeyState(NULL);    
    
ex += svx;
ey += svy; 

if(wallgrid[ex][ey]==2)
  {
     svx = -(svx);
     svy = -(svy);
  }

if(ex < 29)
  {
     svx = -(svx); 
  } 

if(ex > 770)
  {  
     svx = -(svx); 
  }
 
if(ey < 26)
  {  
     svy = -(svy); 
  } 

if(ey > 575)
  {
     svy = -(svy); 
  }
         
    if (keys[SDLK_UP] && ypos >30)
      { 
       ypos -= 25;
      }
      
    if (keys[SDLK_DOWN] && ypos <575)
      { 
       ypos += 25;
       
      }
      
    if (keys[SDLK_LEFT] && xpos >30)
      {
       xpos -= 30;
      }
      
    if (keys[SDLK_RIGHT] && xpos <770)
      { 
       xpos += 30;       
      }
      
    if( keys[SDLK_SPACE] )
      {
	wallgrid[ex][ey]=2;
        DrawIMG(wall,xpos,ypos,grid);
      }


    DrawScene(ex,ey,enemy);
    DrawScene(xpos,ypos,image);
    SDL_Delay(100);
  }//end the main while

  return 0;
}