#include "gameview.h"

#include <QtQuick/qquickwindow.h>

#include <QCursor>

#include <QTimer>

#include <QtGui/QOpenGLContext>

#include <QtGui/QOpenGLShaderProgram>

#include "flib.h"

extern "C" {

extern GameTick_t* flibGameTick;

extern ResizeWindow_t* flibResizeWindow;

extern updateMousePosition_t* flibUpdateMousePosition;

}

GameView::GameView() : m_delta(0), m_renderer(nullptr), m_windowChanged(true) {

  connect(this, &QQuickItem::windowChanged, this,

          &GameView::handleWindowChanged);

}

void GameView::tick(quint32 delta) {

  m_delta = delta;

  if (window()) {

    QTimer* timer = new QTimer(this);

    connect(timer, &QTimer::timeout, window(), &QQuickWindow::update);

    timer->start(100);

    // window()->update();

  }

}

void GameView::handleWindowChanged(QQuickWindow* win) {

  if (win) {

    connect(win, &QQuickWindow::beforeSynchronizing, this, &GameView::sync,

            Qt::DirectConnection);

    connect(win, &QQuickWindow::sceneGraphInvalidated, this, &GameView::cleanup,

            Qt::DirectConnection);

    win->setClearBeforeRendering(false);

    m_windowChanged = true;

  }

}

void GameView::cleanup() {

  if (m_renderer) {

    delete m_renderer;

    m_renderer = 0;

  }

}

void GameView::sync() {

  if (!m_renderer) {

    m_renderer = new GameViewRenderer();

    connect(window(), &QQuickWindow::beforeRendering, m_renderer,

            &GameViewRenderer::paint, Qt::DirectConnection);

  }

  if (m_windowChanged) {

    QSize windowSize = window()->size();

    m_renderer->setViewportSize(windowSize * window()->devicePixelRatio());

    m_centerX = windowSize.width() / 2;

    m_centerY = windowSize.height() / 2;

  }

  QPoint mousePos = mapFromGlobal(QCursor::pos()).toPoint();

  if (flibUpdateMousePosition(m_centerX, m_centerY, mousePos.x(), mousePos.y()))

    QCursor::setPos(mapToGlobal(QPointF(m_centerX, m_centerY)).toPoint());

  m_renderer->tick(m_delta);

}

GameViewRenderer::~GameViewRenderer() {}

void GameViewRenderer::setViewportSize(const QSize& size) {

  flibResizeWindow(size.width(), size.height());

}

void GameViewRenderer::paint() {

  if (m_delta == 0) return;

  flibGameTick(m_delta);

  // m_window->resetOpenGLState();

}