/*
  Name: Pong
  Copyright: None what so ever.
  Author: Joe Bates
  Date: 
  Description: Testing my abilitites as a programmer.
*/

//Headers
#include <stdlib.h>

#include <SDL\SDL.h>
#include <SDL\SDL_gfx.h>
#include <SDL\SDL_image.h>

//Main
int main(int argc, char *argv[])
{
    //Initialize SDL and the screen.
    SDL_Init(SDL_INIT_VIDEO ); atexit(SDL_Quit);
    SDL_Surface *screen = SDL_SetVideoMode(640, 480, 32, SDL_HWSURFACE | SDL_DOUBLEBUF );
    SDL_WM_SetCaption("Pong", NULL);
    
    //Initialize the framerate.
    FPSmanager *framerate;
    SDL_initFramerate(framerate);
    SDL_setFramerate(framerate, 100);
    
    //Initialize images.
    SDL_Surface *lpaddle = IMG_Load("L_Paddle.png");
    SDL_Surface *rpaddle = IMG_Load("R_Paddle.png");
    SDL_Surface *ballimg = IMG_Load(    "Ball.png");
    
    //Initialize variables.
    SDL_Rect lrect;
    lrect.x =   5; lrect.y = 200;
    
    SDL_Rect rrect;
    rrect.x = 615; rrect.y = 200;
    
    SDL_Rect ball ;
    ball.x  = 310; ball.y  = 230;
    float ballmx = 4;
    float ballmy = 0;
    
    int wait = 1;
    
    //Loop start.
    bool done = false;
    while(done == false)
    {
        SDL_Event event;
        
        while ( SDL_PollEvent(&event) )
        {
            if ( event.type == SDL_QUIT )  {  done = true;  }
            if ( event.type == SDL_KEYDOWN )
            {
                if ( event.key.keysym.sym == SDLK_ESCAPE ) { done = true; }
            }
        }
        
        //Clear the screen.
        SDL_FillRect(screen,NULL,SDL_MapRGB(screen->format,0,0,0));
        
        //Get keys.
        Uint8 *keys = SDL_GetKeyState(NULL);
        
        //Respond to keys.
        if     (keys[SDLK_LSHIFT]) lrect.y-=4;
        else if(keys[SDLK_LCTRL] ) lrect.y+=4;
        
        if     (keys[SDLK_UP]  ) rrect.y-=4;
        else if(keys[SDLK_DOWN]) rrect.y+=4;
        
        //Block paddles.
        if(lrect.y <   0) lrect.y =   0;
        if(lrect.y > 400) lrect.y = 400;
        
        if(rrect.y <   0) rrect.y =   0;
        if(rrect.y > 400) rrect.y = 400;      
        
        //Left paddle bounce detection.
        if
        (
            (ball.x <= 15)
            &&
            ((ball.y + 20) >= lrect.y)
            &&
            ( ball.y       <= (lrect.y + 80))
        )
        {
            ballmy = (((ball.y + 10) - (lrect.y + 40)) /10);
            if     (ballmy < 0) ballmx = 4 + ballmy;
            else if(ballmy > 0) ballmx = 4 - ballmy;
            else ballmx = 4;
            
        }
        
        //Right paddle bounce detection.
        if
        (
            (ball.x >= 605)
            &&
            ((ball.y +20) >=  rrect.y)
            &&
            ( ball.y      <=  (rrect.y + 80))
        )
        {
            ballmy = (((ball.y + 10) - (rrect.y + 40)) /10);
            if     (ballmy < 0) ballmx = -4 - ballmy;
            else if(ballmy > 0) ballmx = -4 + ballmy;
            else ballmx = -4;
            
        }
        
        //Wall bounce detection.
        if((ball.y >= 460) || (ball.y <= 0)) ballmy = -ballmy;
        
        //Score detection.
        if((ball.x <= 0) || (ball.x >= 620))
        {
            ball.x = 310;
            ball.y = 230;
            ballmx =   4;
            ballmy =   0;
            wait = 1;
        }
        
        //Move ball.
        if(wait == 0)
        {
            ball.x += ballmx;
            ball.y += ballmy;
        }
        
        //Ball regeneration wait.
        if(wait !=   0)wait++;
        if(wait == 150)wait = 0;
        
        //Draw
        if((wait > 50) || (wait == 0)) SDL_BlitSurface(ballimg, NULL, screen, &ball);
        SDL_BlitSurface(lpaddle, NULL, screen, &lrect);
        SDL_BlitSurface(rpaddle, NULL, screen, &rrect);
        
        rectangleRGBA(screen, 0, 0, 639, 479, 255, 255, 255, 255);
        
        //Synchronize the screen.
        SDL_Flip(screen);
        SDL_framerateDelay(framerate);
    }      
}