#include <iostream>                                                 // iostream library
using namespace std;

#include <SFML/Graphics.hpp>                                        // SFML Library
using namespace sf;

// GLobal Variables (constants)
const string IMAGE_FILE = "data/columbine.png";                     // Path to our image
const int IMAGE_WIDTH = 250;                                        // width of our image
const int IMAGE_HEIGHT = 262;                                       // height of our image

/***** DEFINE YOUR FUNCTION PROTOTYPES BELOW HERE *****/



/***** DEFINE YOUR FUNCTION PROTOTYPES ABOVE HERE *****/

int main() {
    
    // The Original Image
    Image originalImage;                                            // creates an image object
    if (!originalImage.loadFromFile( IMAGE_FILE )) {                // loads the image file into the object
        cerr << "Couldn't open image file!" << endl;
        return EXIT_FAILURE;
    }
    Texture originalTexture;                                        // create a texture object
    originalTexture.loadFromImage(originalImage);                   // load our first image into this texture
    Sprite originalSprite;                                          // create a sprite object
    originalSprite.setTexture(originalTexture);                     // apply our first texture to this sprite
    originalSprite.setPosition(Vector2f(0, 0));                     // place this sprite in the upper left corner

    // The Negated Image
    Image negatedImaged;                                            // creates an image object
    if (!negatedImaged.loadFromFile( IMAGE_FILE )) {                // loads the image file into the object
        cerr << "Couldn't open image file!" << endl;
        return EXIT_FAILURE;
    }
    Color negPxels[IMAGE_WIDTH][IMAGE_HEIGHT];                      // create a 2D array of Color objects
    getPixels(negatedImaged, negPxels);                             // get the pixels from our image to be negated
    doNegative(negPxels);                                           // negate the pixels
    setPixels(negPxels, negatedImaged);                             // set the pixels of our negated image
    Texture negatedTexture;                                         // create a texture object
    negatedTexture.loadFromImage(negatedImaged);                    // load our second image into this texture
    Sprite negatedSprite;                                           // create a sprite object
    negatedSprite.setTexture(negatedTexture);                       // apply our second texture to this sprite
    negatedSprite.setPosition(Vector2f(IMAGE_WIDTH, 0));            // place this sprite in the upper right corner
    
    // The Grayscale Image
    Image grayscaleImage;                                           // creates an image object
    if (!grayscaleImage.loadFromFile( IMAGE_FILE )) {               // loads the image file into the object
        cerr << "Couldn't open image file!" << endl;
        return EXIT_FAILURE;
    }
    Color greyPxels[IMAGE_WIDTH][IMAGE_HEIGHT];                     // create a 2D array of Color objects
    getPixels(grayscaleImage, greyPxels);                           // get the pixels from our image to be grayscaled
    doGrayScale(greyPxels);                                         // grayscale the pixels
    setPixels(greyPxels, grayscaleImage);                           // set the pixels of our grayscale image
    Texture grayscaleTexture;                                       // create a texture object
    grayscaleTexture.loadFromImage(grayscaleImage);                 // load our third image into this texture
    Sprite grayscaleSprite;                                         // create a sprite object
    grayscaleSprite.setTexture(grayscaleTexture);                   // apply our third texture to this sprite
    grayscaleSprite.setPosition(Vector2f(0, IMAGE_HEIGHT));         // place this sprite in the lower left corner
    
    // The Special Image
    Image specialImage;                                             // creates an image object
    if (!specialImage.loadFromFile( IMAGE_FILE )) {                 // loads the image file into the object
        cerr << "Couldn't open image file!" << endl;
        return EXIT_FAILURE;
    }
    Color specialPixels[IMAGE_WIDTH][IMAGE_HEIGHT];                 // create a 2D array of Color objects
    getPixels(specialImage, specialPixels);                         // get the pixels from our image to be specialized
    doSpecial(specialPixels);                                       // specialize the pixels
    setPixels(specialPixels, specialImage);                         // set the pixels of our special image
    Texture specialTexture;                                         // create a texture object
    specialTexture.loadFromImage(specialImage);                     // load our fourth image into this texture
    Sprite specialSprite;                                           // create a sprite object
    specialSprite.setTexture(specialTexture);                       // apply our fourth texture to this sprite
    specialSprite.setPosition(Vector2f(IMAGE_WIDTH, IMAGE_HEIGHT)); // place this sprite in the lower right corner

    // creates the window object with a WIDTH*2xHEIGHT*2 resolution window
    RenderWindow window(VideoMode(IMAGE_WIDTH*2, IMAGE_HEIGHT*2), "Homework 08");

    // Draw loop: Each iteration of this loop draws a single frame
    while (window.isOpen()) {

        // Erase the screen with black (because space)
        window.clear();
        
        window.draw(originalSprite);                                // draw the original sprite to the screen
        window.draw(negatedSprite);                                 // draw the negated sprite to the screen
        window.draw(grayscaleSprite);                               // draw the grayscale sprite to the screen
        window.draw(specialSprite);                                 // draw the special sprite to the screen

        // Apply all the draws to the screen
        window.display();

        // check for a closed window event
        Event event;
        while (window.pollEvent(event)) {
            if (event.type == Event::Closed)
                window.close();
        }
    }

    return EXIT_SUCCESS;
}

/***** PLACE YOUR FUNCTION DEFINITIONS BELOW HERE *****/