/*
 * Game.cpp
 *
 *  Created on: 05.07.2012
 *      Author: Felix
 */

#include "Game.h"

#include "sprites/Enemy.h"
#include "sprites/Player.h"
#include "util/Yaml.h"

/// Goal amount of frames per second.
const int Game::FPS_GOAL = 60;

/**
 * Initializes game, including window and objects (sprites).
 */
Game::Game(sf::RenderWindow& window) :
		mWindow(window),
		mView(sf::Vector2f(0, 0), mWindow.getView().getSize()),
		mTileManager(mWorld),
		mQuit(false),
		mPaused(false) {
	mWindow.setFramerateLimit(FPS_GOAL);
	mWindow.setKeyRepeatEnabled(true);

	generate();
}

/**
 * Generates a predefined map.
 */
void
Game::generate() {
	for (int x = 0; x < 11; x++)
		mTileManager.insertTile(TileManager::TilePosition(x, 0), TileManager::Type::WALL);
	for (int x = 0; x < 11; x++)
		mTileManager.insertTile(TileManager::TilePosition(x, 10), TileManager::Type::WALL);
	for (int y = 1; y < 10; y++)
		mTileManager.insertTile(TileManager::TilePosition(0, y), TileManager::Type::WALL);
	for (int y = 1; y < 10; y++)
		mTileManager.insertTile(TileManager::TilePosition(10, y), TileManager::Type::WALL);

	for (int x = 1; x < 10; x++)
		for (int y = 1; y < 10; y++)
			mTileManager.insertTile(TileManager::TilePosition(x, y), TileManager::Type::FLOOR);

	for (int x = 1; x < 5; x++) {
		mTileManager.removeTile(TileManager::TilePosition(x, 4));
		mTileManager.insertTile(TileManager::TilePosition(x, 4), TileManager::Type::WALL);
	}

	mWorld.insertCharacter(std::shared_ptr<Character>(new Enemy(mWorld,
			sf::Vector2f(400.0f, 200.0f), Yaml("enemy.yaml"))));

	mPlayer = std::shared_ptr<Player>(new Player(mWorld,
			sf::Vector2f(200.0f, 100.0f), Yaml("player.yaml")));
	mWorld.insertCharacter(mPlayer);

	mWorld.generateAreas();
}
/**
 * Closes window.
 */
Game::~Game() {
	mWindow.close();
}

/**
 * Runs the game loop.
 */
void
Game::loop() {
	while (!mQuit) {

		input();

		int elapsed = mClock.restart().asMilliseconds();
		if (mPaused) {
			elapsed = 0;
		}

		mWorld.think(elapsed);

		mWorld.step(elapsed);

		render();
	}
}

/**
 * Handles general game input.
 */
void
Game::input() {
	sf::Event event;
    while (mWindow.pollEvent(event)) {
		switch (event.type) {
		case sf::Event::Closed:
			mQuit = true;
			break;
		case sf::Event::KeyPressed:
			keyDown(event);
			break;
		case sf::Event::KeyReleased:
			keyUp(event);
			break;
		case sf::Event::MouseButtonPressed:
			mouseDown(event);
			break;
		case sf::Event::MouseButtonReleased:
			mouseUp(event);
			break;
		case sf::Event::MouseMoved:
			mPlayer->setCrosshairPosition(convertCoordinates(event.mouseMove.x, event.mouseMove.y));
			break;
		default:
			break;
		}
    }
}

/**
 * Handles key up event. This is used for events that only fire once per keypress.
 */
void
Game::keyUp(const sf::Event& event) {
	switch (event.key.code) {
	case sf::Keyboard::Escape:
		mQuit = true;
		break;
	case sf::Keyboard::Space:
		mPaused = !mPaused;
		break;
	case sf::Keyboard::W:
		mPlayer->setDirection(Player::Direction::UP, true);
		break;
	case sf::Keyboard::S:
		mPlayer->setDirection(Player::Direction::DOWN, true);
		break;
	case sf::Keyboard::A:
		mPlayer->setDirection(Player::Direction::LEFT, true);
		break;
	case sf::Keyboard::D:
		mPlayer->setDirection(Player::Direction::RIGHT, true);
		break;
	default:
		break;
	}
}

/**
 * Handles key down event. This is used for any events that refire automatically.
 */
void
Game::keyDown(const sf::Event& event) {
	switch (event.key.code) {
	case sf::Keyboard::W:
		mPlayer->setDirection(Player::Direction::UP, false);
		break;
	case sf::Keyboard::S:
		mPlayer->setDirection(Player::Direction::DOWN, false);
		break;
	case sf::Keyboard::A:
		mPlayer->setDirection(Player::Direction::LEFT, false);
		break;
	case sf::Keyboard::D:
		mPlayer->setDirection(Player::Direction::RIGHT, false);
		break;
	default:
		break;
	}
}

/**
 * Converts a screen coordinate to a world coordinate.
 */
sf::Vector2<float>
Game::convertCoordinates(int x, int y) {
	return mWindow.convertCoords(sf::Vector2i(x, y), mView);
}

void
Game::mouseDown(const sf::Event& event) {
	switch(event.mouseButton.button) {
	case sf::Mouse::Left:
		mPlayer->pullTrigger();
		break;
	default:
		break;
	}
}
/**
 * Handles mouse key up events.
 */
void
Game::mouseUp(const sf::Event& event) {
	switch (event.mouseButton.button) {
	case sf::Mouse::Left:
		mPlayer->releaseTrigger();
		break;
	case sf::Mouse::Right:
		mPlayer->move(convertCoordinates(event.mouseButton.x, event.mouseButton.y));
		break;
	default:
		break;
	}
}

/**
 * Renders world and GUI.
 */
void
Game::render() {
	mWindow.clear();

	mView.setCenter(mPlayer->getPosition());

	// Render world and dynamic stuff.
	mWindow.setView(mView);

	mWindow.draw(mWorld);

	// Render GUI and static stuff.
	mWindow.setView(mWindow.getDefaultView());

	mWindow.display();
}