#include "gameMain.h"

gameMain::gameMain()
{
    m_window = nullptr;
    m_renderer = nullptr;
    m_event = new SDL_Event();

    Running = true;
    FPS = 60;
}

gameMain::~gameMain()
{
    delete m_event;
    SDL_DestroyRenderer(m_renderer);
    SDL_DestroyWindow(m_window);

    SDL_Quit();
    IMG_Quit();
}

void gameMain::run(std::string title, int w, int h)
{
    m_screenWidth = w;
    m_screenHeight = h;
    m_title = title;

    initSystems();
    gameLoop();
}

void gameMain::initSystems()
{
    if (SDL_Init(SDL_INIT_VIDEO) != 0)
    {
        printf("Error Starting SDL. Error: %s\n", SDL_GetError());
    }

    if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG)
    {
        printf("Error Starting SDL_IMG. ERROR: %s\n", IMG_GetError());
    }

    m_window = SDL_CreateWindow(
        m_title.c_str(),
        SDL_WINDOWPOS_CENTERED,
        SDL_WINDOWPOS_CENTERED,
        m_screenWidth,
        m_screenHeight,
        SDL_WINDOW_SHOWN);

    if (m_window == nullptr)
    {
        printf("Error Creating SDL_Window. Error: %s\n", SDL_GetError());
    }

    m_renderer = SDL_CreateRenderer(m_window,-1,SDL_RENDERER_ACCELERATED);

    if (m_renderer == nullptr)
    {
        printf("Error Creating SDL_Renderer. Error: %s\n", SDL_GetError());
    }
}

void gameMain::gameLoop()
{
    while (Running)
    {
        Uint32 m_startTime = SDL_GetTicks();

        processInput();
        Draw();

        if (1000 / FPS > SDL_GetTicks() - m_startTime)
        {
            SDL_Delay((1000 / FPS) - (SDL_GetTicks() - m_startTime));
        }
    }
}

void gameMain::processInput()
{
    while (SDL_PollEvent(m_event))
    {
        switch (m_event->type)
        {
            case SDL_QUIT:
            {
                Running = false;
            } break;

            case SDL_KEYDOWN:
            {
                switch (m_event->key.keysym.sym)
                {
                    case SDLK_ESCAPE:
                    {
                        Running = false;
                    } break;
                }
            } break;
        }
    }
}

void gameMain::Draw()
{
    SDL_SetRenderDrawColor(m_renderer, 100, 149, 237, 255);

    SDL_RenderClear(m_renderer);
    SDL_RenderPresent(m_renderer);
}

SDL_Renderer* gameMain::getRenderer()
{
    return m_renderer;
}