#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <thread>
#include <chrono>

#include <mmstream.h>
#pragma comment(lib, "WinMM")

#include <QWindow>
#include <QDebug>

#define g_FrameW    1440//3840//7680
#define g_FrameH    960//2160//4320

MainWindow::MainWindow(QWidget* parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_bThreadRunning_Update = false;
    m_ptrThread_Update = nullptr;

    const int pixel_w = g_FrameW;
    const int pixel_h = g_FrameH;

    //
    m_varOpenGLView.Init(eGL_ImageFormat_RGBA, pixel_w, pixel_h);

    {
        uint32_t hWnd = 0;

        if (m_varOpenGLView.GetWndHandle(hWnd))
        {
            QWindow* pWindow = QWindow::fromWinId((WId)hWnd);
            QWidget* pWindowContainer = QWidget::createWindowContainer(pWindow);

            ui->m_GLViewLayout->addWidget(pWindowContainer);
        }
    }

    //
    m_pTestImageData = new uint8_t[pixel_w * pixel_h * 4 * 2 + 1];

    for (int i = 0; i < pixel_w * pixel_h * 4 * 2; i++)
    {
        m_pTestImageData[i] = i % 255;
    }

    m_nTestImageDataIndex = 0;

    //
    StartThread_Update();

    //
    connect(&m_varTimerGL, &QTimer::timeout, this, &MainWindow::OnTimer_UpdateGL);
    m_varTimerGL.setTimerType(Qt::PreciseTimer);
    m_varTimerGL.start(20);

    //glfwTerminate();
    //exit(EXIT_SUCCESS);

    /////////////////////////////////////////////////
}

MainWindow::~MainWindow()
{
    disconnect(&m_varTimerGL, &QTimer::timeout, this, &MainWindow::OnTimer_UpdateGL);

    StopThread_Update();

    ::timeEndPeriod(0);

    m_varOpenGLView.Uninit();

    if (nullptr != m_pTestImageData)
    {
        delete [] m_pTestImageData;
        m_pTestImageData = nullptr;
    }

    delete ui;
}

void    MainWindow::OnTimer_UpdateGL()
{
    const int pixel_w = g_FrameW;
    const int pixel_h = g_FrameH;
    m_varOpenGLView.DrawImage(reinterpret_cast<char*>(&m_pTestImageData[m_nTestImageDataIndex]), pixel_w, pixel_h);
}

void    MainWindow::ThreadEntry(pCallback_ThreadFun pThreadFun, void* pOwner)
{
    MainWindow* pThis = reinterpret_cast<MainWindow*>(pOwner);

    if (nullptr == pThis)
    {
        return;
    }

    (pThis->*pThreadFun)();
}

bool    MainWindow::ThreadFun_Update()
{
    const int pixel_w = g_FrameW;
    const int pixel_h = g_FrameH;

    uint64_t szCounter[100];
    memset(szCounter, 0, sizeof(szCounter));

    int nIndex = 0;

    int nCounter = 0;


    while (m_bThreadRunning_Update)
    {
        nIndex += pixel_w * 4;

        if (nIndex >= pixel_w * pixel_h * 4)
        {
            nIndex = 0;
        }

        m_nTestImageDataIndex = nIndex;

        memcpy(&szCounter[0], &szCounter[1], 99 * sizeof(uint64_t));

        szCounter[99] = std::chrono::high_resolution_clock::now().time_since_epoch().count();

        nCounter++;

        if (nCounter >= 120)
        {
            nCounter = 0;

            double dSpan = double(szCounter[99] - szCounter[0]);

            double dFPS = 100.0 / (dSpan / 1000000000.0);

            qDebug("dSpan : %f, fps: %f", dSpan, dFPS);
            int jj = 0;
        }

        std::this_thread::sleep_for(std::chrono::microseconds(10 * 1000));    // 100FPS
    }


    return true;
}

bool    MainWindow::StartThread_Update()
{
    StopThread_Update();

    //
    m_bThreadRunning_Update = true;
    m_ptrThread_Update = new std::thread(std::bind(&MainWindow::ThreadEntry, &MainWindow::ThreadFun_Update, (void*)this));

    return true;
}

void    MainWindow::StopThread_Update()
{
    //
    if (m_bThreadRunning_Update)
    {
        m_bThreadRunning_Update = false;

        if (nullptr != m_ptrThread_Update)
        {
            m_ptrThread_Update->join();

            delete m_ptrThread_Update;
            m_ptrThread_Update = nullptr;
        }
    }
}