#include "application.h"
#include "core/inputtype.h"

#include "mainmenu.h"
#include "gamestate.h"
#include "editorstate.h"

#include "tools/music.h"
#include "classicmode/classicfactory.h"

#include <iostream>

const sf::Time TIME_PER_FRAME = sf::seconds(1.f / 90.f);

Application::Application() :
    _game_window({1280, 720}, "Test", sf::Style::Default)
{
    _font_holder.load(Fonts::Id::GUI, "SourceCodePro-Regular.ttf");

    _game_window.setFramerateLimit(60);
    _game_window.setKeyRepeatEnabled(false);
    _game_window.setMouseCursorGrabbed(false);
    _game_window.setVerticalSyncEnabled(true);

    MainMenu::Callbacks callbacks =
    {
        [&](){ pushState(GUIState::Tag::GAME); },
        [&](){ pushState(GUIState::Tag::EDITOR); }
    };

    EditorState::Callbacks editor_callbacks = {[&](){ popState(); }};

    const auto main_menu = std::make_shared<MainMenu>(_game_window, std::move(callbacks), _font_holder);
    const auto game_state = std::make_shared<GameState>(_game_window, classic::init(_game_window), GameState::Callbacks());
    const auto editor = std::make_shared<EditorState>(_game_window, std::move(editor_callbacks), std::make_unique<Music>(), _font_holder);

    _states[GUIState::Tag::MAIN_MENU] = main_menu;
    _states[GUIState::Tag::GAME] = game_state;
    _states[GUIState::Tag::EDITOR] = editor;

    _state_stack.emplace_back(_states.at(GUIState::Tag::MAIN_MENU));
}

void Application::run()
{
    _game_window.display();
    exec();
}

void Application::exec()
{
    sf::Clock timer;
    sf::Time time_since_last_update = sf::Time::Zero;

    while (_game_window.isOpen())
    {
        time_since_last_update += timer.restart();

        input();

        bool isOneFramePassed = time_since_last_update >= TIME_PER_FRAME;
        if (isOneFramePassed)
        {
            time_since_last_update -= TIME_PER_FRAME;
            update(time_since_last_update);
            draw();
        }
    }
}

void Application::input()
{
    sf::Event event;
    while (_game_window.pollEvent(event))
    {
        switch(event.type)
        {
        case sf::Event::Closed:
            _game_window.close();
            break;

        default:
            _state_stack.back()->input(event);
            break;
        }
    }
}

void Application::update(const sf::Time& dt)
{
    _state_stack.back()->update(dt);
}

void Application::draw()
{
    _game_window.clear();

    for (const auto& state : _state_stack)
        state->draw();

    _game_window.display();
}

void Application::pushState(GUIState::Tag new_state)
{
    _state_stack.back()->leave();
    _state_stack.emplace_back(_states.at(new_state));
    _state_stack.back()->enter();
}

void Application::popState()
{
    _state_stack.back()->leave();
    _state_stack.pop_back();
    _state_stack.back()->enter();
}