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// Dark GDK - The Game Creators - www.thegamecreators.com

// Pong!
// Written By Scarface ( First EVER Program )

#include "DarkGDK.h"

// Declare Global Vars
const int BAT_SPEED = 10;
const int BALL_SPEED = 4;
const int BALL_SIZE = 5;
const int P1_BAT_POS_Y = 30;
const int P2_BAT_POS_Y = 435;

// Declare Struct
struct BallMovement
{
	int pos_x;
	int pos_y;
	int dir_x;
	int dir_y;
};
struct BallMovement MoveBall( int ball_pos_x, int ball_pos_y, int ball_dir_x, int ball_dir_y );

// Declare Functions
void DrawBall( int ball_pos_x, int ball_pos_y );
void DrawPlayer1Bat( int bat_pos_x );
void DrawPlayer2Bat( int bat_pos_x );
int DoPlayer1Movement( int bat_pos_x );
int DoPlayer2Movement( int bat_pos_x );

// the main entry point for the application is this function
void DarkGDK( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn( );
	dbSyncRate( 60 );

	// Initilize Vars
	int p1_bat_pos_x = 270;
	int p2_bat_pos_x = 270;
	int ball_dir_x = 1;
	int ball_dir_y = 1;
	int ball_pos_x = 310;
	int ball_pos_y = 220;

	// Initialize Struct
	struct BallMovement Ball;

	// our main loop
	while ( LoopGDK( ) )
	{
		// Clear Screen
		dbCLS( );

		// Debug
		dbText( 10, 10, dbStr ( dbScanCode (  ) ) ); 

		// Draw Game Boundries
		dbLine ( 20, 40, 20, 435 );
		dbLine ( 620, 40, 620, 435 );

		// Check Bat Movement
		p1_bat_pos_x = DoPlayer1Movement( p1_bat_pos_x );
		p2_bat_pos_x = DoPlayer2Movement( p2_bat_pos_x );

		// Check Ball Movement
		Ball = MoveBall( ball_pos_x, ball_pos_y, ball_dir_x, ball_dir_y );
		ball_pos_x = Ball.pos_x;
		ball_pos_y = Ball.pos_y;
		ball_dir_x = Ball.dir_x;
		ball_dir_y = Ball.dir_y;

		// Draw Bats
		DrawPlayer1Bat( p1_bat_pos_x ); 		
		DrawPlayer2Bat( p2_bat_pos_x ); 

		// Draw Ball
		DrawBall( ball_pos_x, ball_pos_y );
		
		// update the screen
		dbSync( );
	}

	// return back to windows
	return;
}

void DrawBall( int ball_pos_x, int ball_pos_y )
{
	dbCircle( ball_pos_x, ball_pos_y, BALL_SIZE );	
}

void DrawPlayer1Bat( int bat_pos_x )
{
	dbBox( bat_pos_x, P1_BAT_POS_Y, bat_pos_x + 100, P1_BAT_POS_Y +10 );
}

void DrawPlayer2Bat( int bat_pos_x )
{
	dbBox( bat_pos_x, P2_BAT_POS_Y, bat_pos_x + 100, P2_BAT_POS_Y +10 );
}

int DoPlayer1Movement( int bat_pos_x )
{
	if ( dbLeftKey( ) )
	{
		bat_pos_x -= BAT_SPEED;
		if ( bat_pos_x < 20 )
			{ bat_pos_x = 20; }
	}
	else if ( dbRightKey( ) )
	{
		bat_pos_x += BAT_SPEED;
		if ( bat_pos_x > 520 )
			{ bat_pos_x = 520; }
	}
	return bat_pos_x;
}

int DoPlayer2Movement( int bat_pos_x )
{
	if ( dbKeyState( 44 ) )
	{
		bat_pos_x -= BAT_SPEED;
		if ( bat_pos_x < 20 )
			{ bat_pos_x = 20; }
	}
	else if ( dbKeyState( 45 ) )
	{
		bat_pos_x += BAT_SPEED;
		if ( bat_pos_x > 520 )
			{ bat_pos_x = 520; }
	}
	return bat_pos_x;
}

struct BallMovement MoveBall( int ball_pos_x, int ball_pos_y, int ball_dir_x, int ball_dir_y )
{
	BallMovement Ball;
	
	if ( ball_dir_x )
	{ 
		ball_pos_x += BALL_SPEED; 
		if ( ball_pos_x > 618 )
		{ 
			ball_pos_x = 618; 
			ball_dir_x = 0;
		}
	}
	else
	{ 
		ball_pos_x -= BALL_SPEED; 
		if ( ball_pos_x < 18 )
		{ 
			ball_pos_x = 18; 
			ball_dir_x = 1;
		}
	}
	if ( ball_dir_y )
	{ 
		ball_pos_y += BALL_SPEED; 
		if ( ball_pos_y > 440 )
		{ 
			ball_pos_y = 440; 
			ball_dir_y = 0;
		}
	}
	else
	{ 
		ball_pos_y -= BALL_SPEED;
		if ( ball_pos_y < 28 )
		{ 
			ball_pos_y = 28; 
			ball_dir_y = 1;
		}
	}
	
	Ball.pos_x = ball_pos_x;
	Ball.pos_y = ball_pos_y;
	Ball.dir_x = ball_dir_x;
	Ball.dir_y = ball_dir_y;

	return Ball;
}