#include <SFML/Graphics.hpp>
#include <iostream>
#include <cstdlib>
#include <string>
#include <ctime>
using namespace sf;

void moveBackground(RenderWindow& w, Sprite& s);
void printText(RenderWindow& w, Text& score, bool updateScore);
bool updateBall(RenderWindow& w, Sprite& s, Sprite& p1, Sprite& p2);

int main() {
    RenderWindow w(VideoMode(1000, 500), "Super Mario Bros. Pong!");
    Texture bg, paddleTexture, ballTexture;
    Image windowIcon;
    Font roboto;
    std::srand(std::time(0));

    if (!bg.loadFromFile("background_2.png") || !windowIcon.loadFromFile("icon.png") || !roboto.loadFromFile("Roboto-bold.ttf") || !paddleTexture.loadFromFile("t.png")
        || !ballTexture.loadFromFile("ball.png")) {
        exit(-1);
    }

    bg.setSmooth(1);
    ballTexture.setSmooth(1);
    paddleTexture.setSmooth(1);
    paddleTexture.setRepeated(1);

    //Paddles
    Sprite paddle1(paddleTexture, IntRect(0, 0, paddleTexture.getSize().x, paddleTexture.getSize().y));
    paddle1.rotate(90);
    paddle1.setOrigin(Vector2f((float)paddle1.getGlobalBounds().width / 2, (float)paddle1.getGlobalBounds().height / 2));
    paddle1.setPosition(Vector2f(10.f, (float)w.getSize().y / 2));
    Sprite paddle2(paddleTexture, IntRect(0, 0, paddleTexture.getSize().x, paddleTexture.getSize().y));
    paddle2.rotate(-90);
    paddle2.setOrigin(Vector2f((float)paddle2.getGlobalBounds().width / 2, (float)paddle2.getGlobalBounds().height / 2));
    paddle2.setPosition(Vector2f((float)w.getSize().x - 10.f, (float)w.getSize().y / 2));

    //Balls
    Sprite ball(ballTexture, IntRect(0, 0, ballTexture.getSize().x, ballTexture.getSize().y));
    ball.setOrigin(Vector2f((float)ball.getGlobalBounds().width / 2, (float)ball.getGlobalBounds().height / 2));
    ball.setPosition(Vector2f(w.getSize().x / 2.f, w.getSize().y / 2.f));
    ball.scale(.20f, .20f);

    //Set Window Background
    Sprite bgSprite;
    bgSprite.setTexture(bg);

    //bgSprite.setColor(Color(236, 68, 68));

    //Set Window Icon
    Vector2u iconSize = windowIcon.getSize();
    w.setIcon(iconSize.x, iconSize.y, windowIcon.getPixelsPtr());

    //Write Message
    Text score;
    score.setFont(roboto);
    score.setString("SCORE:");
    FloatRect scoreSize = score.getGlobalBounds();
    score.setPosition(Vector2f((float)w.getSize().x - scoreSize.width, 10));
    score.setCharacterSize(20);
    score.setOutlineColor(Color::Black);
    score.setOutlineThickness(5);

    //Set Views
    View standard = w.getView(),
        fixed = standard;

    while (w.isOpen()) {
        Event e;
        while (w.pollEvent(e)) {
            switch (e.type) {
            case Event::Closed:
                w.close();
                break;
            case Event::KeyPressed:
                if (e.key.code == Keyboard::W) {
                    if (paddle1.getGlobalBounds().top > 0)
                        paddle1.move(Vector2f(0, -20));
                }
                else if (e.key.code == Keyboard::S) {
                    if (paddle1.getGlobalBounds().top + paddle1.getGlobalBounds().height < w.getSize().y)
                        paddle1.move(Vector2f(0, 20));
                }
                else if (e.key.code == Keyboard::Up) {
                    if (paddle2.getGlobalBounds().top > 0)
                        paddle2.move(Vector2f(0, -20));
                }
                else if (e.key.code == Keyboard::Down) {
                    if (paddle2.getGlobalBounds().top + paddle2.getGlobalBounds().height < w.getSize().y)
                        paddle2.move(Vector2f(0, 20));
                }
            }
        }

        w.clear();

        moveBackground(w, bgSprite);

        w.setView(standard);
        w.draw(bgSprite);

        w.setView(w.getDefaultView());
        w.draw(paddle1);
        w.draw(paddle2);
        printText(w, score, updateBall(w, ball, paddle1, paddle2));
        w.display();
    }
    return 0;
}

void moveBackground(RenderWindow & w, Sprite & s) {
    static int dx = 1, dy = 1;

    FloatRect sBounds = s.getGlobalBounds();
    Vector2u wSize = w.getSize();

    if (dx == -1 && sBounds.left + sBounds.width <= wSize.x)
        dx *= -1;
    else if (sBounds.left >= 0)
        dx *= -1;

    if (dy == 1 && sBounds.top >= 0)
        dy *= -1;
    else if (sBounds.top + sBounds.height <= wSize.y)
        dy *= -1;

    s.move(.01 * dx, .01 * dy);
}

void printText(RenderWindow& w, Text& score, bool updateScore) {
    static int scoreCount = 0;

    if (updateScore)
        scoreCount++;

    std::string count = std::to_string(scoreCount);

    score.setString("Score: " + count);
    w.draw(score);
}

bool updateBall(RenderWindow& w, Sprite& ball, Sprite& p1, Sprite& p2) {
    static float dx = -1, dy = -1;
    bool hitPaddle = false;

    Vector2f ballCoord = ball.getPosition();
    float randFloat = std::rand() % 100 / 100.f + 1;

    if (ballCoord.x <= 0 || ballCoord.x >= w.getSize().x) {
        dx *= -1;
        ball.rotate(40);
    }

    if (ballCoord.y <= 0 || ballCoord.y >= w.getSize().y) {
        dy *= -1;
        ball.rotate(-40);
    }

    if (ball.getGlobalBounds().intersects(p1.getGlobalBounds()) ||
        ball.getGlobalBounds().intersects(p2.getGlobalBounds())) {
        dx *= (-randFloat);
        dy *= (-randFloat);
        ball.rotate(30);
        hitPaddle = true;
    }
    dx = dx >= 2 ? dx - 1 : dx;
    dy = dy >= 2 ? dy - 1 : dy;
    ball.move(Vector2f(.5f * dx, .5f * dy));
    w.draw(ball);
    return hitPaddle;
}