// Copyright (C) 2017 Mike Krus
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

#include "viewer/OSGRenderer.h"
#include "viewer/OsgOpenGLWindow.h"
#include "viewer/osgQOpenGLWidget.h"

//#include <osgQOpenGL/CullVisitorEx>
//#include <osgQOpenGL/GraphicsWindowEx>

#include <QApplication>
#include <QScreen>
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QOpenGLShaderProgram>
#include <QOpenGLVertexArrayObject>

#include <QKeyEvent>
#include <QMouseEvent>
#include <QWheelEvent>

#include <osgViewer/GraphicsWindow>

#include "config.h"
#include "common/SpdLogger.h"



OSGRenderer::OSGRenderer(QObject* parent)
    : QObject(parent), osgViewer::Viewer() {
}

OSGRenderer::~OSGRenderer()
{
}

void OSGRenderer::Init(osg::GraphicsContext* gc) {
    LOG_INFO("OSGRenderer::Init {}, gc:{}", isInited_, spdlog::fmt_lib::ptr(gc));
    if (!gc) {
        return;
    }

    if (isInited_) {
        return;
    }

    getCamera()->setGraphicsContext(gc);
    getCamera()->setViewport(new osg::Viewport(0, 0, gc->getTraits()->width, gc->getTraits()->height));
    isInited_ = true;
}

void OSGRenderer::Resize(osg::GraphicsContext* gc, int width, int height) {
    LOG_INFO("OSGRenderer::Resize {}, gc:{}", isInited_, spdlog::fmt_lib::ptr(gc));
    if (!gc) {
        return;
    }

    if (isInited_) {
        return;
    }

    osgViewer::GraphicsWindow* window = dynamic_cast<osgViewer::GraphicsWindow*>(gc);
    dyt_check(nullptr != window);
    window->getEventQueue()->windowResize(0, 0, width, height);
    window->resized(0, 0, width, height);
}

void OSGRenderer::Render() {
    frame();
    emit RenderFlush();
}

void OSGRenderer::Destoy() {
    done();
}

bool OSGRenderer::event(QEvent* event) {
    switch (event->type()) {
    case INIT: {
        RenderBindGraphicsContextEvent* e = reinterpret_cast<RenderBindGraphicsContextEvent*>(event);
        Init(e->gc_.get());
        return true;
    }
    case RENDER: {
        Render();
        return true;
    }
    case RESIZE: {
        GraphicsWindowResizeEvent* e = reinterpret_cast<GraphicsWindowResizeEvent*>(event);
        Resize(e->gc_.get(), e->width_, e->height_);
        return true;
    }
    case DESTROY: {
        GraphicsWindowResizeEvent* e = reinterpret_cast<GraphicsWindowResizeEvent*>(event);
        Resize(e->gc_.get(), e->width_, e->height_);
        return true;
    }
    }
    return QObject::event(event);
}