#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include <iostream>
#include <random>
#include <chrono>
#include <list>
#include "Bird.h"
#include "Pipe.h"

#ifdef linux
#elif defined _WIN32
#elif defined TARGET_OS_MAC
#endif

const float g = 7.8;
const int WINDOW_X = 600;
const int WINDOW_Y = 800;

float elap_time() {
	static std::chrono::time_point<std::chrono::system_clock> start;
	static bool started = false;

	if (!started) {
		start = std::chrono::system_clock::now();
		started = true;
	}

	std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
	std::chrono::duration<double> elapsed_time = now - start;
	return static_cast<float>(elapsed_time.count());
}

int main()
{
	std::mt19937 rng(time(NULL));
	std::uniform_int_distribution<int> rgen(100, 400);

	int pipe_dist = 200;

	sf::RenderWindow window(sf::VideoMode(WINDOW_X, WINDOW_Y), "flappy");

    std::shared_ptr<std::vector<sf::Texture>> texture_list = std::make_shared<std::vector<sf::Texture>>();
    for (int i = 0; i < 4; i++) {
        sf::Texture t;
        t.loadFromFile("../Assets/bird.png", sf::IntRect(0, i*12, 34, 24));
        texture_list->push_back(t);
    }

	// Init flappy
    Bird bird(WINDOW_X/2, WINDOW_Y/2, texture_list);

    std::list<Pipe> pipes;

	// Init world
	sf::Texture background = sf::Texture(); background.loadFromFile("../Assets/sky.png");
	sf::Sprite background_sprite = sf::Sprite(background); background_sprite.setPosition(0, 0); background_sprite.setScale(8, 8);
	sf::Texture land = sf::Texture(); land.loadFromFile("../Assets/land.png");
	sf::Sprite land_sprite = sf::Sprite(land); land_sprite.setPosition(0, WINDOW_Y - WINDOW_Y / 10); land_sprite.setScale(3, 2);
	sf::Texture pipe_up, pipe_down = sf::Texture(); pipe_down.loadFromFile("../Assets/pipe-down.png"); pipe_up.loadFromFile("../Assets/pipe-up.png");
	sf::Sprite pipe_up_sprite = sf::Sprite(pipe_up); sf::Sprite pipe_down_sprite = sf::Sprite(pipe_down);
	sf::Texture pipe_shaft = sf::Texture(); pipe_shaft.loadFromFile("../Assets/pipe.png");
	sf::Sprite pipe_shaft_sprite = sf::Sprite(pipe_shaft);

	double momentum = 0;
	float step_size = 0.005f;
	double frame_time = 0.0, elapsed_time = 0.0, delta_time = 0.0, accumulator_time = 0.0, current_time = 0.0;
	float speed = 250;

    std::shared_ptr<sf::Shader> shader = std::make_shared<sf::Shader>();
    if (!shader->loadFromFile("/home/mrh/source/floppy-bird/Assets/shaders/pipe_shader.vert", "/home/mrh/source/floppy-bird/Assets/shaders/pipe_shader.frag"))
    {
        std::cout << "asodijfoqijwef" << std::endl;
    }

	while (window.isOpen())
	{
		sf::Event event; // Handle input
		while (window.pollEvent(event)) {
			if (event.type == sf::Event::Closed) 
				window.close();
			if (event.type == sf::Event::MouseWheelScrolled)
				if (event.mouseWheelScroll.wheel == sf::Mouse::VerticalWheel)
					speed += event.mouseWheelScroll.delta * 20;
			if(event.type == sf::Event::KeyPressed)
				if (event.key.code == sf::Keyboard::Space)
					bird.impulse(3.0);
			if (event.type == sf::Event::MouseButtonPressed) {
				if (event.mouseButton.button == sf::Mouse::Right)
					pipe_dist -= 10;
				if (event.mouseButton.button == sf::Mouse::Middle)
					pipe_dist += 10;
				if (event.mouseButton.button == sf::Mouse::Left)
                    bird.impulse(3.0);
			}
		}

		elapsed_time = elap_time(); // Handle time
		delta_time = elapsed_time - current_time;
		current_time = elapsed_time;
		if (delta_time > 0.02f) {
            delta_time = 0.02f;
        }
		accumulator_time += delta_time;

		while ((accumulator_time - step_size) >= step_size) { // While the frame has sim time, update 
			accumulator_time -= step_size;

			if (pipe_down_sprite.getPosition().x < -pipe_down_sprite.getGlobalBounds().width) {
				pipe_down_sprite.setPosition(WINDOW_X, rgen(rng));
				pipe_up_sprite.setPosition(WINDOW_X, pipe_down_sprite.getPosition().y + pipe_dist);

                pipes.emplace_back(100, 100, std::make_shared<sf::Texture>(pipe_up), std::make_shared<sf::Texture>(pipe_shaft), shader);
                std::cout << "added one" << std::endl;
			}
			else {
				pipe_up_sprite.setPosition(pipe_up_sprite.getPosition().x - step_size * speed, pipe_up_sprite.getPosition().y);
				pipe_down_sprite.setPosition(pipe_down_sprite.getPosition().x - step_size * speed, pipe_down_sprite.getPosition().y);
			}
			if (background_sprite.getPosition().x + background_sprite.getGlobalBounds().width < WINDOW_X) {
                background_sprite.setPosition(0, 0);
            }
			else 
				background_sprite.setPosition(background_sprite.getPosition().x - step_size * (speed - 100), background_sprite.getPosition().y);
			if (land_sprite.getPosition().x + 10 + land_sprite.getGlobalBounds().width < WINDOW_X) 
				land_sprite.setPosition(14, land_sprite.getPosition().y);
			else
				land_sprite.setPosition(land_sprite.getPosition().x - step_size * speed, land_sprite.getPosition().y);

			// Check collisions
            if (bird.collides(pipe_up_sprite.getGlobalBounds()) ||
                bird.collides(pipe_down_sprite.getGlobalBounds()) ||
                bird.collides(land_sprite.getGlobalBounds())
                )
            {
                //std::cout << "dead!!!!!!!!" << std::endl;
            }

            bird.tick(step_size);
            for (auto pipe = pipes.begin(); pipe != pipes.end(); ++pipe)
            {
                pipe->tick(step_size, speed);
            }
		}

		window.draw(background_sprite, &*shader);  // Render
		window.draw(land_sprite);
		window.draw(bird);
		window.draw(pipe_up_sprite);
		window.draw(pipe_down_sprite);

        for (auto ptr = pipes.begin(); ptr != pipes.end(); ++ptr)
        {
            window.draw(*ptr);
        }

		pipe_shaft_sprite.setPosition(pipe_up_sprite.getPosition()); // Render the bottom pipe
		int y_pos = pipe_up_sprite.getPosition().y + pipe_up_sprite.getGlobalBounds().height;
		while (y_pos < WINDOW_Y) {
			pipe_shaft_sprite.setPosition(pipe_shaft_sprite.getPosition().x, y_pos);
			y_pos++;
			window.draw(pipe_shaft_sprite);
		}

		y_pos = pipe_down_sprite.getPosition().y; // Render the top pipe
		while (y_pos > 0) {
			pipe_shaft_sprite.setPosition(pipe_shaft_sprite.getPosition().x, y_pos);
			y_pos--;
			window.draw(pipe_shaft_sprite);
		}

		window.display();



	}
	return 0;

}