#include "Game.h"

Game::Game()
{
    frame = 0;
    fps = 60;
    frame_start = 0;

    screen_width = 1024;
    screen_height = 768;

    total_tiles = 0;
    map_width = 0;
    map_height = 0;

    camera.x = 0;
    camera.y = 0;
    camera.w = screen_width;
    camera.h = screen_height;

    quit = false;

    SDL_Init( SDL_INIT_EVERYTHING );
    buffer = SDL_SetVideoMode( screen_width, screen_height, 32, SDL_SWSURFACE );
    SDL_WM_SetCaption( "for_loop[-]", NULL );
}

Game::~Game()
{
    SDL_Quit();
}

SDL_Surface* Game::load_image( std::string filename )
{
  //surfaces for the loaded and optimized images
    SDL_Surface* loaded_image = NULL;
    SDL_Surface* opt_image = NULL;

  //load the image
    loaded_image = IMG_Load( filename.c_str() );

  //optimze the image
    if ( loaded_image != NULL )
    {
        opt_image = SDL_DisplayFormat( loaded_image );
        SDL_FreeSurface( loaded_image );

      //colorkey
        if ( opt_image != NULL )
        {
            SDL_SetColorKey( opt_image, SDL_SRCCOLORKEY, SDL_MapRGB( opt_image->format, 0, 255, 255 ) );
        }
    }

  //return the optimized image
    return opt_image;
}

void Game::apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip )
{
  //rectangle for holding the offset
    SDL_Rect offset;
    offset.x = x;
    offset.y = y;

  //blit the surface
    SDL_BlitSurface( source, clip, destination, &offset );
}

bool Game::check_collision( int ax, int ay, int aw, int ah, int bx, int by, int bw, int bh )
{
  //a is right of b
    if ( ax >= bx + bw )
        return false;

  //a is left of b
    if ( ax + aw <= bx )
        return false;

  //a is below b
    if ( ay >= by + bh )
        return false;

  //a is above b
    if ( ay + ah <= by )
        return false;

  //they collide
    return true;
}

void Game::regulate_frame()
{
    frame++;

    if ( SDL_GetTicks() - frame_start < 1000 / fps )
    {
        SDL_Delay( (1000 / fps) - (SDL_GetTicks() - frame_start) );
    }
}