#include <utility>
#include <SFML/Window/Event.hpp>
#include <SFML/Graphics/RenderWindow.hpp>

#include "game.h"

Game::Game(std::shared_ptr<sf::RenderWindow> window) : window(std::move(window)),
                                                       gameObjects(),
                                                       views()
{
}

Game::~Game()
{
    for (auto &gameObject: gameObjects)
    {
        delete gameObject;
    }
}

void Game::run()
{
    sf::Clock clock;
    sf::Time TimeSinceLastUpdate = sf::seconds(0);

    while (window->isOpen())
    {

        InputMapper::getInstance()->processEvents();
        TimeSinceLastUpdate += clock.restart();
        while (TimeSinceLastUpdate >= FRAME_TIME)
        {
            TimeSinceLastUpdate -= FRAME_TIME;

            update();
            InputMapper::getInstance()->processEvents();
        }
        drawFrame();
    }
}

void Game::exit()
{
    window->close();
}

void Game::drawFrame()
{
    window->clear(sf::Color::Black);

    for (auto &gameObject: gameObjects)
    {
        if (gameObject->getActive())
        {
            gameObject->draw(window.get());
        }
    }

    window->display();
}

void Game::addGameObject(GameObject *gameObject)
{
    gameObjects.push_back(gameObject);
}

void Game::update()
{
    // Basic Updates
    for (auto &gameObject: gameObjects)
    {
        if (gameObject->getActive())
        {
            gameObject->update();
        }
    }

    // Late updates
    for (auto &gameObject: gameObjects)
    {
        if (gameObject->getActive())
        {
            gameObject->lateUpdate();
        }
    }

    InputMapper::getInstance()->updateIdentityEvents();
}

std::shared_ptr<Game> Game::getInstance()
{
    if (singletonInstance == nullptr)
    {
        throw std::runtime_error("Game instance has to be initialized first.");
    }

    return singletonInstance;
}

std::shared_ptr<Game> Game::constructInstance(const std::shared_ptr<sf::RenderWindow> &window)
{
    if (singletonInstance != nullptr)
    {
        throw std::runtime_error("Game instance has already been initialized.");
    }

    singletonInstance = std::make_shared<Game>(window);

    return singletonInstance;
}

void Game::registerView(TrackingView *view)
{
    views.push_back(view);
}