//SDL Includes
#include "SDL/SDL.h"
#include "SDL/SDL_image.h"
#include "SDL/SDL_ttf.h"
#include "SDL/SDL_mixer.h"
#include <string>

//Screen Attributes
const int SCREEN_WIDTH = 640; 
const int SCREEN_HEIGHT = 607; 
const int SCREEN_BPP = 32;

//The button states in the sprite sheet
const int CLIP_MOUSEOVER = 0;
const int CLIP_MOUSEOUT = 1;
const int CLIP_MOUSEDOWN = 2;
const int CLIP_MOUSEUP = 3;

//The surfaces
SDL_Surface *board = NULL; 
SDL_Surface *sprites = NULL;
SDL_Surface *screen = NULL;

//Event Structures 
SDL_Event event;

//The clip regions of the sprite sheet
SDL_Rect clips[ 4 ];

//The button
class Button
{
    private:
    //The attributes of the button
    SDL_Rect box;

    //The part of the button sprite sheet that will be shown
    SDL_Rect* clip;

    public:
    //Initialize the variables
    Button( int x, int y, int w, int h );

    //Handles events and set the button's sprite region
    void handle_events();

    //Shows the button on the screen
    void show();
};

SDL_Surface *load_image( std::string filename ) 
{ 
    //Temporary storage for the image that's loaded 
    SDL_Surface* loadedImage = NULL; 
    
    //The optimized image that will be used 
    SDL_Surface* optimizedImage = NULL;
    
    //Load the image 
    loadedImage = IMG_Load( filename.c_str() );
    
    //If nothing went wrong in loading the image 
    if( loadedImage != NULL ) 
    { 
        //Create an optimized image 
        optimizedImage = SDL_DisplayFormat( loadedImage ); 
        //Free the old image 
        SDL_FreeSurface( loadedImage ); 
    }
    
    //Return the optimized image 
    return optimizedImage; 
}

void apply_surface( int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip = NULL )
{
    //Holds offsets
    SDL_Rect offset;

    //Get offsets
    offset.x = x;
    offset.y = y;

    //Blit
    SDL_BlitSurface( source, clip, destination, &offset );
}

bool init()
{
    //Initialize all SDL subsystems 
    if( SDL_Init( SDL_INIT_EVERYTHING ) == -1 ) 
    { 
        return 1; 
    }
    
    //Set up the screen 
    screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, SDL_SWSURFACE );
    
    //If there was an error in setting up the screen 
    if( screen == NULL ) 
    { 
        return 1; 
    }
    
    //Set the window caption 
    SDL_WM_SetCaption( "TicTacToe", NULL );
    
    //If everything OK
    return true;
}

bool load_files()
{
    //Load Images
    board = load_image( "images/board.tga" );
    
    //Load the button sprite sheet
    sprites = load_image( "images/sprites.tga" );
    
    //If there was an error loading the images
    if( board == NULL )
    {
        return false;
    }
    
    //If everything loaded fine
    return true;
}

void clean_up()
{
    //Free the loaded image
    SDL_FreeSurface(board);
    SDL_FreeSurface(sprites);
    
    //Quit SDL
    SDL_Quit();
}

void set_clips()
{
    //Clip the sprite sheet
    clips[ CLIP_MOUSEOVER ].x = 0;
    clips[ CLIP_MOUSEOVER ].y = 169;
    clips[ CLIP_MOUSEOVER ].w = 160;
    clips[ CLIP_MOUSEOVER ].h = 169;

    clips[ CLIP_MOUSEOUT ].x = 180;
    clips[ CLIP_MOUSEOUT ].y = 169;
    clips[ CLIP_MOUSEOUT ].w = 160;
    clips[ CLIP_MOUSEOUT ].h = 169;

    clips[ CLIP_MOUSEDOWN ].x = 0;
    clips[ CLIP_MOUSEDOWN ].y = 0;
    clips[ CLIP_MOUSEDOWN ].w = 160;
    clips[ CLIP_MOUSEDOWN ].h = 169;

    clips[ CLIP_MOUSEUP ].x = 180;
    clips[ CLIP_MOUSEUP ].y = 0;
    clips[ CLIP_MOUSEUP ].w = 160;
    clips[ CLIP_MOUSEUP ].h = 169;
}

Button::Button( int x, int y, int w, int h )
{
    //Set the button's attributes
    box.x = x;
    box.y = y;
    box.w = w;
    box.h = h;

    //Set the default sprite
    clip = &clips[ CLIP_MOUSEOUT ];
}


void Button::handle_events()
{
    //The mouse offsets
    int x = 0, y = 0;

    //If the mouse moved
    if( event.type == SDL_MOUSEMOTION )
    {
        //Get the mouse offsets
        x = event.motion.x;
        y = event.motion.y;

        //If the mouse is over the button
        if( ( x > box.x ) && ( x < box.x + box.w ) && ( y > box.y ) && ( y < box.y + box.h ) )
        {
            //Set the button sprite
            clip = &clips[ CLIP_MOUSEOVER ];
        }
        //If not
        else
        {
            //Set the button sprite
            clip = &clips[ CLIP_MOUSEOUT ];
        }
    }
    //If a mouse button was pressed
    if( event.type == SDL_MOUSEBUTTONDOWN )
    {
        //If the left mouse button was pressed
        if( event.button.button == SDL_BUTTON_LEFT )
        {
            //Get the mouse offsets
            x = event.button.x;
            y = event.button.y;

            //If the mouse is over the button
            if( ( x > box.x ) && ( x < box.x + box.w ) && ( y > box.y ) && ( y < box.y + box.h ) )
            {
                //Set the button sprite
                clip = &clips[ CLIP_MOUSEDOWN ];
            }
        }
        if( event.button.button == SDL_BUTTON_RIGHT )
        {
            //Get the mouse offsets
            x = event.button.x;
            y = event.button.y;

            //If the mouse is over the button
            if( ( x > box.x ) && ( x < box.x + box.w ) && ( y > box.y ) && ( y < box.y + box.h ) )
            {
                //Set the button sprite
                clip = &clips[ CLIP_MOUSEUP ];
            }
        }
    }
    
}

void Button::show()
{
    //Show the button
    apply_surface( box.x, box.y, sprites, screen, clip );
}

int main( int argc, char* args[] )
{
    //Quit flag
    bool quit = false;

    //Initialize
    if( init() == false )
    {
        return 1;
    }

    //Load the files
    if( load_files() == false )
    {
        return 1;
    }
    
    //Blits board
    apply_surface( 0, 0, board, screen, NULL );

    //Clip the sprite sheet
    set_clips();

    //Make the button
    Button myButton( 25, 10, 180, 169 );
    Button myButton2( 235, 10, 180, 169 );
    Button myButton3( 450, 10, 180, 169 );
    Button myButton4( 25, 210, 180, 169 );
    Button myButton5( 235, 210, 180, 169 );
    Button myButton6( 450, 210, 180, 169 );
    Button myButton7( 25, 420, 180, 169 );
    Button myButton8( 235, 420, 180, 169 );
    Button myButton9( 450, 420, 180, 169 );
    
    //While the user hasn't quit
    while( quit == false )
    {
        //If there's events to handle
        if( SDL_PollEvent( &event ) )
        {
            //Handle button events
            myButton.handle_events();
            myButton2.handle_events();
            myButton3.handle_events();
            myButton4.handle_events();
            myButton5.handle_events();
            myButton6.handle_events();
            myButton7.handle_events();
            myButton8.handle_events();
            myButton9.handle_events();

            //If the user has Xed out the window
            if( event.type == SDL_QUIT )
            {
                //Quit the program
                quit = true;
            }
        }

        //Show the button
        myButton.show();
        myButton2.show();
        myButton3.show();
        myButton4.show();
        myButton5.show();
        myButton6.show();
        myButton7.show();
        myButton8.show();
        myButton9.show();

        //Update the screen
        if( SDL_Flip( screen ) == -1 )
        {
            return 1;
        }
    }

    //Clean up
    clean_up();

    return 0;
}