#include <iostream>

#include <getopt.h>

#include "Game.h"
#include "gaming-core/utils/Clock.h"
#include "gaming-core/wrapper/GL.h"
#include "gaming-core/wrapper/GLEW.h"
#include "gaming-core/wrapper/GLFW.h"
#include "gaming-core/wrapper/Shader.h"
#include "gaming-core/wrapper/Window.h"
#include "gaming-core/wrapper/WindowOptions.h"
#include "rendering/Renderer.h"

bool parseArgs(int argAmount, char* const* args, WindowOptions& options) {
    while(true) {
        switch(getopt(argAmount, args, "fv")) {
            case '?': return true;
            case 'f': options.fullscreen = true; break;
            case 'v': options.vsync = true; break;
            case -1: return false;
        }
    }
}

int main(int argAmount, char* const* args) {
    WindowOptions options(3, 0, Size(800, 480), true, "Pigine");
    if(parseArgs(argAmount, args, options) || GLFW::init()) {
        return 0;
    }

    Window window(options);
    if(window.hasError() || GLEW::init()) {
        return 0;
    }

    Shader shader("resources/shader/vertex.vs", "resources/shader/fragment.fs");
    if(shader.hasError()) {
        return 0;
    }

    Renderer renderer(shader);

    Clock fps;
    Clock tps;

    Buttons buttons(window);
    Controller controller(buttons);
    static Game game(controller, fps, tps);

    window.show();

    const Clock::Nanos nanosPerTick = 10'000'000;
    Clock::Nanos lag = 0;
    while(!window.shouldClose() && game.isRunning()) {
        GL::checkAndPrintError("GL-Error");

        lag += fps.update();
        while(lag >= nanosPerTick) {
            lag -= nanosPerTick;
            tps.update();
            buttons.tick();
            game.tick();
        }

        Size size = window.getSize();
        GL::setViewport(size.width, size.height);

        Matrix view;
        view.scale(Vector3(2.0f / size.width, -2.0f / size.height, 1.0f));
        view.translate(Vector3(-1.0f, 1.0f, 0.0f));
        shader.setMatrix("view", view.getValues());

        game.render(static_cast<float>(lag) / nanosPerTick, renderer);
        window.swapBuffers();
        GL::clearFramebuffer();

        glfwPollEvents();
    }
    return 0;
}