#include "util.h"

#include <iostream>
#include <SDL/SDL_gfxPrimitives.h>
#include <SDL/SDL_image.h>

using namespace std;

Sint16 cx=320, cy=240, cr=7;
SDL_Surface *guy;

void drawScene(SDL_Surface *screen)
{
  lock(screen);
  for(int x=0;x<640;x++)
    for(int y=0;y<480;y++)
      pixelColor(screen, x,y, 0x996633ff ^ ((x+y) << 8) );
  /*
  cr = clamp(cr, 4, 50, 1);
  cx = clamp(cx, 0, 639, 4);
  cy = clamp(cy, 0, 479, 4);
  */
  SDL_Rect destRect = guy->clip_rect;
  destRect.x = cx - destRect.w/2;
  destRect.y = cy - destRect.h/2;
  SDL_BlitSurface(guy,NULL, screen,&destRect);
  filledCircleRGBA(screen, cx,cy,cr, 0,255,255, (51-cr)*4+67);
  unlock(screen);
  SDL_Flip(screen);
}

void pollKeys( Uint8 *keys )
{
  if ( keys[SDLK_UP] )
    cy = (cy-1 < 0) ? 0 : cy-1;
  if ( keys[SDLK_DOWN] )
      cy = (cy+1 > 479) ? 479 : cy+1;
  if ( keys[SDLK_LEFT] )
      cx = (cx-1 < 0) ? 0 : cx-1;
  if ( keys[SDLK_RIGHT] )
      cx = (cx+1 > 639) ? 639 : cx+1;
  if ( keys[SDLK_KP_MINUS] )
      cr = (cr-1 < 0) ? 0 : cr-1;
  if ( keys[SDLK_KP_PLUS] )
      cr = (cr+1 > 50) ? 50 : cr+1;
}

SDL_Surface *init()
{
  // do inits
  //if( SDL_Init(SDL_INIT_VIDEO|SDL_INIT_AUDIO) <0 )
  if( SDL_Init(SDL_INIT_VIDEO) <0 )
  {
    cout << "Unable to init SDL: " << SDL_GetError() << endl;
    return NULL;
  }
  else
    cout << "Successful init" << endl;

  initRand();
  atexit(SDL_Quit); // listens for quit events and cleans up

  SDL_Surface *screen = SDL_SetVideoMode(640, 480, 32, SDL_HWSURFACE|SDL_DOUBLEBUF);
  SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
  guy = IMG_Load("sprites/guy.png");
  
  if ( screen == NULL )
    cout << "Screen is null: " << SDL_GetError() << endl;
  if ( guy == NULL )
  {
    cout << "Image is null: " << IMG_GetError() << endl;
    return NULL;
  }

  return screen;
}

int main()
{
  SDL_Event event;
  Uint32 start,end;
  bool done = false;
  SDL_Surface *screen = init();

  if (screen == NULL)
    return 1;


  while (!done)
  {
    // TODO timer mark
    start = SDL_GetTicks();
    //cout << "start: " << start << endl;
    while (!done && SDL_PollEvent(&event))
    {
      //cout << "ev: at " << SDL_GetTicks() << endl;
      switch (event.type)
      {
        case SDL_QUIT:
          done = true; break;
        default:
          break;
      }
      break;
    }
    if (done)
      break;
    
    pollKeys( SDL_GetKeyState(NULL) );
    drawScene(screen);
    // TODO timer check; delay for (25ms - usage)
    //      only want 40 fps max
    end = SDL_GetTicks();
    //cout << "end: " << end << endl;
    
//   if (end-start < 20)
//   {
//     cout << "Scene drawn, delaying for " << 20+start-end << " ms" << endl;
//     SDL_Delay(20+start-end);
//   }
    SDL_Delay(20);
    
  }
}