#include "app.h"
#include "states/ids.h"
#include "states/titleState.h"

const sf::Time App::TIME_PER_FRAME = sf::seconds(1.f/60.f);


App::App()
    : textures_()
    , window_(sf::VideoMode(640, 480), "Demo game" )
    , stateStack_( State::Context{&window_, &textures_, &textureFonts_} )
    //, player_()
{
    window_.setFramerateLimit(60);

    registerStates();
    stateStack_.push(States::Id::Title);
}

void App::run(){
    // Make the app render the current state, so it needs a state stack too
    sf::Clock clock;
    sf::Time timeSinceLastUpdate = sf::Time::Zero;

    while(window_.isOpen()){


        // TODO Maybe move to a fixed time game loop (I prefer that)
        sf::Time dt = clock.restart();
        timeSinceLastUpdate += dt;

        while (timeSinceLastUpdate > TIME_PER_FRAME)
        {
            timeSinceLastUpdate -= TIME_PER_FRAME;

            processInput();
            update(TIME_PER_FRAME);

            // Check inside this loop, because stack might be empty before update() call
            if (stateStack_.isEmpty()) window_.close();
        }

        render();
    }
}

void App::render(){
    window_.clear();
    stateStack_.render();
    window_.display();
}


void App::update(sf::Time dt){
    stateStack_.update(dt);
}

void App::processInput(){
    sf::Event event;
    while (window_.pollEvent(event))
    {
        stateStack_.handleEvent(event);

        if (event.type == sf::Event::Closed)
            window_.close();
    }
}

void App::registerStates(){
    stateStack_.registerState<TitleState>(States::Id::Title);
}