#include "viewer/OsgWidget.h"


#include <QWindow>
#include <QGridLayout>
#include <QMessageBox>
#include <QScreen>
#include <QDragEnterEvent>
#include <QDropEvent>
#include <QMimeData>
#include <QDebug>
#include <osgDB/ReadFile>
#include <osgEarthUtil/EarthManipulator>

#include <osgViewer/ViewerEventHandlers>
#include <osgGA/StateSetManipulator>

#include "OsgView.h"
#include "OsgViewer.h"
#include "common/SpdLogger.h"
#include "scene/OEScene.h"
#include "ui/MainFrame.h"
#include "workspace/WorkSpaceManager.h"
#include "workspace/WorkSpace.h"
#include "scutcheon/osgScutcheon.h"

static void ConfigureView( osgViewer::View* view ) {
    view->addEventHandler(new osgViewer::StatsHandler());
    view->addEventHandler(new osgViewer::WindowSizeHandler());
    view->addEventHandler(new osgViewer::ThreadingHandler());
    view->addEventHandler(new osgViewer::LODScaleHandler());
    view->addEventHandler(new osgGA::StateSetManipulator(view->getCamera()->getOrCreateStateSet()));
    view->addEventHandler(new osgViewer::RecordCameraPathHandler());
    view->addEventHandler(new osgViewer::ScreenCaptureHandler());
}


OsgWidget::OsgWidget(QWidget* parent, Qt::WindowFlags f)
    : QWidget(parent, f)
{
     // setAttribute(Qt::WA_PaintOnScreen, true);
     // setAttribute(Qt::WA_StaticContents, true);
     // setAttribute(Qt::WA_NoSystemBackground, true);
     //setAttribute(Qt::WA_OpaquePaintEvent, true);
     // setAttribute(Qt::WA_DontCreateNativeAncestors, false);
    
    setThreadingModel(osgViewer::ViewerBase::SingleThreaded);
    setMouseTracking(true);
    setKeyEventSetsDone(0);
    
    // 启用拖拽接收
    setAcceptDrops(true);
    
    connect( &timer_, SIGNAL(timeout()), this, SLOT(update()) );
    timer_.start( 10 );

    setMinimumSize(100, 100);
    LOG_INFO("OsgWidget::OsgWidget");
}

OsgWidget::~OsgWidget() {
    LOG_INFO("OsgWidget::~OsgWidget");
    if (nullptr != workspace_) {
        workspace_->Unlaod();
    }
    if (nullptr != viewUI_) {
		viewUI_->RemoveUI(activeScene_->GetOrCreateSceneUI());
        viewUI_ = nullptr;
    }
}

void OsgWidget::Initialize() {
	LOG_INFO("OsgWidget::Initialize");
    QHBoxLayout* layout = new QHBoxLayout(this);
    activeScene_ = new OEScene;
	connect(&WorkSpaceManager::Get(), &WorkSpaceManager::WorkSpaceChanged, [this](WorkSpace* workspace) {
        if (nullptr == workspace) {
			LOG_WARN("workspace is nullptr");
            return;
        }

        activeScene_->SetHomeViewpoint(workspace->GetHomeViewpoint(), 3.0);
        }
    );
    QWidget* widget = addViewWidget( createGraphicsWindow(0,0,100,100));
    layout->addWidget(widget);

    viewUI_ = new OsgViewUI(view_, 100,100);
    viewUI_->AddUI(activeScene_->GetOrCreateSceneUI());

    //osgScutcheonManager::instance()->Init(view_.get(), activeScene_);
}

void OsgWidget::Uninitialize() {
    LOG_INFO("OsgWidget::Uninitialize");
    if (nullptr != viewUI_) {
        viewUI_->RemoveUI(activeScene_->GetOrCreateSceneUI());
        viewUI_ = nullptr;
    }
    if (nullptr != activeScene_) {
        activeScene_->DetachView(view_);
        activeScene_ = nullptr;
    }
    if (nullptr != view_) {
        removeView(view_);
        view_ = nullptr;
    }
}

void OsgWidget::LoadDefaultScene() {
    dyt_check(nullptr != activeScene_);
    if (nullptr == WorkSpaceManager::Get().LoadDefaultWorkspace(activeScene_)) {
        LOG_ERROR("load default workspace failed");
        //QMessageBox::warning(this, tr("warning"), tr("default workspace failed"));
    }
}

void OsgWidget::OnLoadDyt(const QString& path) {
    LOG_INFO("load dyt path:{}", path.toStdString());
    WorkSpace* workSpace = WorkSpaceManager::Get().LoadDyt(path);
    if (nullptr == workSpace) {
        QMessageBox::warning(&MainFrame::Get(), tr("warning"),
            tr("open dyt file failed"), QMessageBox::Ok);
        return;
    }

    const QString& name = workSpace->GetName();
    const QString windowTitle = MainFrame::Get().windowTitle();

    MainFrame::Get().setWindowTitle(windowTitle + "-" + name);
    WorkSpaceManager::Get().SetCurrent(workSpace);
    if (nullptr != workspace_ && workspace_ != workSpace) {
        workspace_->Unlaod();
    }

    workspace_ = workSpace;

    emit signalResetWorkSpace();
}

osgQt::GraphicsWindowQt* OsgWidget::createGraphicsWindow(int x, int y, int w, int h, const std::string& name,
                                                         bool windowDecoration) {
    osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();
    osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
    traits->windowName = name;
    traits->windowDecoration = windowDecoration;
    traits->x = x;
    traits->y = y;
    traits->width = w;
    traits->height = h;
    traits->doubleBuffer = true;
    traits->alpha = ds->getMinimumNumAlphaBits();
    traits->stencil = ds->getMinimumNumStencilBits();
    traits->sampleBuffers = ds->getMultiSamples();
    traits->samples = ds->getNumMultiSamples();

    return new osgQt::GraphicsWindowQt(traits.get());
}

QWidget* OsgWidget::addViewWidget(osgQt::GraphicsWindowQt* gw) {
    view_ = new osgViewer::View;
    addView( view_ );
    ConfigureView(view_);

    osg::Camera* camera = view_->getCamera();
    camera->setGraphicsContext( gw );

    const osg::GraphicsContext::Traits* traits = gw->getTraits();

    camera->setClearColor( osg::Vec4(0.2f, 0.2f, 0.6f, 1.0) );
    camera->setViewport( new osg::Viewport(0, 0, traits->width, traits->height) );
    camera->setProjectionMatrixAsPerspective(30.0f, static_cast<double>(traits->width)/static_cast<double>(traits->height), 1.0f, 10000.0f );

    activeScene_->AttachView(view_);
    return gw->getGLWidget();
}

void OsgWidget::resizeEvent(QResizeEvent* event) {
    QWidget::resizeEvent(event);

    if (nullptr == view_) {
        return;
    }
    qreal devicePixelRatio = screen()->devicePixelRatio();
    const QSize& size = event->size();
    viewUI_->Resize(size.width() * devicePixelRatio, size.height() * devicePixelRatio);
}

void OsgWidget::paintEvent(QPaintEvent*) {
    frame();
}

void OsgWidget::dragEnterEvent(QDragEnterEvent* event) {
    // 检查是否是预制模型拖拽
    if (event->mimeData()->hasFormat("application/x-preset-model")) {
        event->acceptProposedAction();
    } else {
        event->ignore();
    }
}

void OsgWidget::dragMoveEvent(QDragMoveEvent* event) {
    // 检查是否是预制模型拖拽
    if (event->mimeData()->hasFormat("application/x-preset-model")) {
        event->acceptProposedAction();
    } else {
        event->ignore();
    }
}

void OsgWidget::dropEvent(QDropEvent* event) {
    // 检查是否是预制模型拖拽
    if (event->mimeData()->hasFormat("application/x-preset-model")) {
        QByteArray data = event->mimeData()->data("application/x-preset-model");
        QString modelInfo = QString::fromUtf8(data);
        
        // 解析模型信息 (格式: "modelType|modelName")
        QStringList parts = modelInfo.split("|");
        if (parts.size() == 2) {
            QString modelType = parts[0];
            QString modelName = parts[1];
            
            // 获取拖拽位置
            QPointF position = event->posF();
            
            // 处理预制模型拖拽
            OnPresetModelDropped(modelType, modelName, position);
            
            event->acceptProposedAction();
        } else {
            event->ignore();
        }
    } else {
        event->ignore();
    }
}

void OsgWidget::OnPresetModelDropped(const QString& modelType, const QString& modelName, const QPointF& position) {
    // TODO: 实现预制模型拖拽处理逻辑
    // 1. 将屏幕坐标转换为世界坐标
    // 2. 创建对应的Entity和MeshComponent
    // 3. 添加到场景中
    
    qDebug() << "预制模型拖拽:" << modelType << modelName << "位置:" << position;
    
    // 这里暂时只是输出调试信息，后续需要集成实体系统
}