#include <QHBoxLayout>
#include <QRandomGenerator>
#include <cmath>
#include <limits>
#include <qcustomplot.h>

#include "centralwidget.h"
#include "filemanager.h"
#include "pointcalculate.h"
#include "logger.h"

CentralWidget::CentralWidget(QWidget *parent)
    : QWidget(parent),
      _customPlot(new QCustomPlot(this))
    ,_analysisMode(AnalysisMode::None)
{
    setMouseTracking(true);

    setStyleSheet("background-color: lightgray;");
    resize(888, 666);

    QHBoxLayout *layout = new QHBoxLayout();
    layout->setMargin(0);
    layout->addWidget(_customPlot);
    this->setLayout(layout);

    // 创建两条竖线
    _line1 = new QCPItemStraightLine(_customPlot);
    _line1->point1->setCoords(20, _customPlot->yAxis->range().lower);
    _line1->point2->setCoords(20, _customPlot->yAxis->range().upper);
    _line1->setPen(QPen(Qt::red));
    _line1->setSelectable(true);

    _line2 = new QCPItemStraightLine(_customPlot);
    _line2->point1->setCoords(40, _customPlot->yAxis->range().lower);
    _line2->point2->setCoords(40, _customPlot->yAxis->range().upper);
    _line2->setPen(QPen(Qt::red));
    _line2->setSelectable(true);

    // 安装事件过滤器
    //    _graph = _customPlot->addGraph(0);
    //    _eventHandler = new EventHandler(_customPlot, _line1, _line2, _graph, nullptr);

    _eventHandler = new EventHandler(_customPlot, _line1, _line2, nullptr);
    _eventHandler->setEnable(true);

    _customPlot->installEventFilter(_eventHandler);
    _customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectPlottables);

    connect(_eventHandler,&EventHandler::sigSendLineXCoord,
            this,&CentralWidget::sigSendLineXCoord);

    //    connect(_customPlot, &QCustomPlot::selectionChangedByUser,
    //            this, &CentralWidget::slotSelectionChanged);


    setEventHandlerEnable(false);
    //
#if 0
    // init data
    QVector<double> x(101), y(101);
    for (int i = 0; i < 101; i++) {
        x[i] = i / 50.0 - 1;//设置x的范围为-1~1
        y[i] = x[i] * x[i];
    }

    _customPlot->graph(0)->setData(x, y);
    //设置坐标轴标签
    _customPlot->xAxis->setLabel("x coordinates");
    _customPlot->yAxis->setLabel("y coordinates");
    //设置坐标轴范围，以便我们可以看到全部数据
    _customPlot->xAxis->setRange(0, 1);
    _customPlot->yAxis->setRange(0, 100);
    _customPlot->replot();
#endif
    //    startTimer(1000);
}

CentralWidget::~CentralWidget()
{
    FileManager::close();
}

void CentralWidget::setAnalysisMode(const CentralWidget::AnalysisMode mode)
{
    _analysisMode = mode;

    switch (mode)
    {
    case AnalysisMode::NumericalLabel:
    case AnalysisMode::StartPoint:
    case AnalysisMode::StopPoint:
    case AnalysisMode::PeakSynthesisAnalysis:
    case AnalysisMode::GlassTransition:
        setEventHandlerEnable(true);
        break;
    default:
        break;
    }
}

void CentralWidget::slotModeModify(const Global::Mode mode)
{
    if (Global::Mode::ExperimentStart == mode)
    {
#if 0
        if (_customPlot->graphCount() > 0 && _currentGraph)
        {
            // 清除第一个图表上的数据
            _currentGraph->setData(QVector<double>(), QVector<double>());
        }
#endif

        // 创建画布,设置画布上的点数据
        //        _graph = _customPlot->addGraph();

        // 设置坐标轴标签
        _customPlot->xAxis->setLabel("Temp/℃");
        _customPlot->yAxis->setLabel("DSC/mW");
        // 设置坐标轴范围，以便我们可以看到全部数据
        _customPlot->xAxis->setRange(0, 400);
        _customPlot->yAxis->setRange(-20, 20);
    }
    else if (Global::Mode::Analysis == mode)
    {
        qDebug() << "file close...";
        FileManager::close();
    }
}

void CentralWidget::slotRecvCommonData(const CommonData &cd)
{
    qDebug() << "slotRevCommonData";

    _customPlot->graph(0)->addData(cd.sample_temp, cd.dsc); // 添加数据到曲线
    _customPlot->replot();
    _customPlot->rescaleAxes();
    //
    FileManager::writeExperimentFile(cd);
}

void CentralWidget::slotRecvAnalysisFileName(const QString &fileName)
{
    qDebug() << "slotRecvAnalysisFileName" << fileName;

    //
    // clearData(ClearDataMode::All);
    //
    _dataVtr.clear();
    FileManager::readExperimentFile(fileName, _dataVtr);

    if (_dataVtr.size() < 0)
    {
        return;
    }
    //
    //    _customPlot->xAxis->setRange(0, 500);
    //        _customPlot->yAxis->setRange(-20, 20);
    PointCalculate::setExperimentData(_dataVtr);
    QPair<QPointF,QPointF>startEndPointPair =  PointCalculate::getStartAndEndPoint();

    QPointF endPoint = startEndPointPair.second;
    _customPlot->xAxis->setRange(0, endPoint.x() / 3 * 4);

    QPointF peakPoint = PointCalculate::getPeakPoint();
    float absY = std::abs(peakPoint.y());
    _customPlot->yAxis->setRange(- absY * 2,absY *2);

    // 设置坐标轴标签
    _customPlot->yAxis->setLabel("DSC/mW");
    _customPlot->xAxis->setLabel("Temp/℃");

    QVector<double> tVtr,xVtr, yVtr;
    int index = 0;
    for (FileManager::ExperimentData &ed : _dataVtr)
    {
        tVtr.push_back(index++);
        xVtr.push_back(ed.sampleTemp);
        yVtr.push_back(ed.dsc);
    }

    _currentCurve = new QCPCurve(_customPlot->xAxis, _customPlot->yAxis);
    _currentCurve->setData(tVtr, xVtr, yVtr);
    //    _currentCurve->setPen(QPen(Qt::red)); // 设置线条颜色为红色
    //    _currentCurve->setBrush(QBrush(QColor(255, 0, 0, 20))); // 设置填充颜色并带有透明度
    _currentCurve->setSelectable(QCP::stWhole); // 设置曲线可选
    //    _currentCurve->setSelectable(QCP::stPlottable); // 设置曲线可选

    Global::instance()->_curveDataVtr.push_back(
                qMakePair<QCPCurve*,QVector<FileManager::ExperimentData>>(
                    _currentCurve,_dataVtr));

    // 清除第一个图表上的数据
#if 0
    if (_customPlot->graphCount() > 0 && _graph)
    {
        // 清除第一个图表上的数据
        _graph->setData(QVector<double>(), QVector<double>());
    }
#endif

#if 0
    _currentGraph = _customPlot->addGraph();
    _graphVtr.push_back(_currentGraph);

    _currentGraph->addData(xVtr, yVtr);
#endif
    _customPlot->replot();
}

void CentralWidget::slotSelectionChanged()
{
    logde<<"selectedPlottables:"<< _customPlot->selectedPlottables().size();
    logde<<"selectedGraphs:"<< _customPlot->selectedGraphs().size();
    logde<<"selectedItems:"<< _customPlot->selectedItems().size();

    logde<<"plottableCount:"<< _customPlot->plottableCount();

    return;

    for(int i = 0;i < _customPlot->plottableCount(); i++)    {
        QCPCurve *curve = qobject_cast<QCPCurve *>(_customPlot->plottable(i));
        if(curve){
            if (curve->selected()) {
                logde<<"selected...";
                curve->setPen(QPen(Qt::green));
                _customPlot->replot();
            } else {
                curve->setPen(QPen(Qt::blue));
                _customPlot->replot();
            }
        }

        logde << "Current pen color:" << curve->pen().color().name().toStdString();
    }

    //    _customPlot->replot();
    //    _customPlot->update();

#if 0
    for (QCPAbstractPlottable *plottable : _customPlot->plottable()) {
        QCPCurve *curve = qobject_cast<QCPCurve *>(plottable);
        if (curve) {
            if (curve->selected()) {
                // 曲线被选中，设置为橙色
                curve->setPen(QPen(Qt::green));
            } else {
#if 0
                // 曲线未被选中，恢复默认颜色
                if (curve == _curve1) {
                    curve->setPen(QPen(Qt::blue));
                } else if (curve == _curve2) {
                    curve->setPen(QPen(Qt::red));
                }

#endif
            }
        }
    }
#endif

#if 0
    // 检查是否有曲线被选中
    if (_customPlot->selectedPlottables().size() > 0) {
        QCPCurve *selectedCurve = qobject_cast<QCPCurve *>(_customPlot->selectedPlottables().first());
        if (selectedCurve) {
            selectedCurve->setPen(QPen(Qt::green));
#if 0
            // 弹出颜色选择对话框
            QColor color = QColorDialog::getColor(selectedCurve->pen().color(), this);
            if (color.isValid()) {
                // 改变曲线颜色
                selectedCurve->setPen(QPen(color));
            }
#endif
        }else{

        }
    }
#endif


}

void CentralWidget::slotAnalysisSettingApply()
{
    switch (_analysisMode) {
    case AnalysisMode::NumericalLabel:
    {
        QPointF selectPoint = PointCalculate::getClosestPointByX(
                    _line1->point1->coords().x());

        drawText(selectPoint,PointCalculate::textFormatNumbericalLabel(selectPoint));

        break;
    }
    case AnalysisMode::StartPoint:
    case AnalysisMode::StopPoint:{
        double x1 = _line1->point1->coords().x();
        double x2 = _line2->point1->coords().x();
        PointCalculate::setRegionPointX(x1,x2);

        QPair<QPointF, QPointF> startEndPointPair =
                PointCalculate::calculateStartAndEndPoint();

        if(_analysisMode == AnalysisMode::StartPoint){
            drawText(startEndPointPair.first,
                     PointCalculate::textFormatStartPoint(startEndPointPair.first));
        }else{
            drawText(startEndPointPair.second,
                     PointCalculate::textFormatEndPoint(startEndPointPair.second));
        }

        break;
    }
    case AnalysisMode::PeakSynthesisAnalysis:
    {
        double x1 = _line1->point1->coords().x();
        double x2 = _line2->point1->coords().x();

        fillGraph(x1,x2);

        PointCalculate::setRegionPointX(x1,x2);

        //enthalpy
        double enthalpyValue = PointCalculate::calculateArea();
        //peak
        QPointF peakPoint = PointCalculate::getPeakPoint();

        //start point and end point
        QPair<QPointF, QPointF> startEndPointPair =
                PointCalculate::calculateStartAndEndPoint();

        logde<<"start,end:"<<startEndPointPair.first.x()<<","
            <<startEndPointPair.second.x();

        drawText(peakPoint,PointCalculate::textFormatPeakPoint(enthalpyValue,
                                                               peakPoint.x(),
                                                               startEndPointPair.first.x(),
                                                               startEndPointPair.second.x()));
        //
        break;
    }
    case AnalysisMode::GlassTransition:
    {
        glassTransitionHandle();
        //
        break;
    }
    default:
        break;
    }
}

void CentralWidget::slotAnalysisSettingConfirm()
{
    slotAnalysisSettingApply();
    setAnalysisMode(CentralWidget::AnalysisMode::None);

    _line1->setVisible(false);
    _line2->setVisible(false);

    emit sigRightDockWidgetHide();
}

void CentralWidget::slotAnalysisSettingUndo()
{
    clearData(ClearDataMode::Undo);
}

void CentralWidget::slotAnalysisSettingCancel()
{
    clearData(ClearDataMode::Undo);
    setAnalysisMode(CentralWidget::AnalysisMode::None);

    _line1->setVisible(false);
    _line2->setVisible(false);

    emit sigRightDockWidgetHide();
}

void CentralWidget::slotAnalysisSettingLineXPoint(const int index, const double)
{

}

void CentralWidget::timerEvent(QTimerEvent *event)
{
    // key的单位是秒
    double key = QDateTime::currentDateTime().toMSecsSinceEpoch() / 1000.0;
    // 添加数据
    // 使用随机数产生一条曲线
    // double value0 = realDataI();
    double value0 = QRandomGenerator::global()->bounded(10.123);
    _customPlot->graph(0)->addData(key, value0); // 添加数据到曲线

    // 删除8秒之前的数据。这里的8要和下面设置横坐标宽度的8配合起来
    // 才能起到想要的效果，可以调整这两个值，观察显示的效果。
    _customPlot->graph(0)->data()->remove(key - 80);
    // 自动设定graph(1)曲线y轴的范围，如果不设定，有可能看不到图像
    // 也可以用ui->customPlot->yAxis->setRange(up,low)手动设定y轴范围
    _customPlot->graph(0)->rescaleValueAxis(true);

    // 这里的8，是指横坐标时间宽度为8秒，如果想要横坐标显示更多的时间
    // 就把8调整为比较大到值，比如要显示60秒，那就改成60。
    // 这时removeDataBefore(key-8)中的8也要改成60，否则曲线显示不完整。

    _customPlot->yAxis->setRange(0, 20);                          // 设定x轴的范围
    _customPlot->xAxis->setRange(key + 0.25, 80, Qt::AlignRight); // 设定x轴的范围
    _customPlot->replot();
}

void CentralWidget::contextMenuEvent(QContextMenuEvent *event)
{
    qDebug()<<"left menu...";
    QPoint point =  event->globalPos();
    emit sigContextMenuShow(point);
}

void CentralWidget::glassTransitionHandle()
{
    QPointF point1 = PointCalculate::getClosestPointByX(_line1->point1->coords().x());
    QPointF point2 = PointCalculate::getClosestPointByX(_line2->point1->coords().x());

    logde<<"point1:"<<point1.x()<<","<<point1.y();
    logde<<"point2:"<<point2.x()<<","<<point2.y();

#if 0
    QCPItemStraightLine *line1 = new QCPItemStraightLine(_customPlot);
    line1->point1->setCoords(point1.x() - 5,point1.y());
    line1->point2->setCoords(point1.x() + 5,point1.y());
    line1->setPen(QPen(Qt::darkRed));
    line1->setSelectable(false);
    line1->setVisible(true);

    QCPItemStraightLine *line2 = new QCPItemStraightLine(_customPlot);
    line2->point1->setCoords(point2.x() - 5,point2.y());
    line2->point2->setCoords(point2.x() + 5,point2.y());
    line2->setPen(QPen(Qt::darkGreen));
    line2->setSelectable(false);
    line2->setVisible(true);

    _customPlot->replot();
#endif
    //
    PointCalculate::LineStruct lineStrc1,lineStrc2,tangetLineStrc;

    lineStrc1.slope = 0.0;
    lineStrc1.intercept = point1.y();

    lineStrc2.slope = 0.0;
    lineStrc2.intercept  = point2.y();

    QPair<float,float> tangentLinePair = PointCalculate::getCurveInflectionPointTangent(point1.x(),point2.x());
    tangetLineStrc.slope = tangentLinePair.first;
    tangetLineStrc.intercept = tangentLinePair.second;

    QPointF intersection1 = PointCalculate::getIntersectionBySlope(tangetLineStrc,lineStrc1);
    QPointF intersection2 = PointCalculate::getIntersectionBySlope(tangetLineStrc,lineStrc2);

    //    logde<<"intersection1 x:"<<intersection1.x();
    //    logde<<"intersection2 x:"<<intersection2.x();

    //
    float averageY = (point1.y() + point2.y()) /2;
    logde<<"average Y:"<<averageY;
    QPointF averagePoint = PointCalculate::getClosestPointByY(point1.x(),point2.x(),averageY);

    //    logde<<"average y:"<<averageY;

    logde<<"averagePoint x,y:"<<averagePoint.x()<<","
        <<averagePoint.y();

    logde<<"glass T1:"<<intersection1.x()
        <<",Tg:"<<averagePoint.x()
       <<",T2:"<<intersection2.x();

    QString str = PointCalculate::textFormatGlassTranstion(intersection2.x(),
                                                           averagePoint.x(),
                                                           intersection1.x());
    drawText(averagePoint,str);

#if 0
    // 创建一个圆形绘图项
    QCPItemEllipse *circle = new QCPItemEllipse(_customPlot);
    //    _customPlot->addItem(circle);

    // 设置圆形的位置和大小
    circle->topLeft->setCoords(-5, 5);
    circle->bottomRight->setCoords(5, -5);

    // 设置圆形的填充和边框颜色
    circle->setBrush(QBrush(Qt::cyan));
    circle->setPen(QPen(Qt::blue));
#endif

#if 0
    QCPItemStraightLine *line3 = new QCPItemStraightLine(_customPlot);
    line3->point1->setCoords(averagePoint.x() + 1,averagePoint.y() + 1);
    line3->point2->setCoords(averagePoint.x() - 1,averagePoint.y() - 1);
    line3->setPen(QPen(Qt::black));
    line3->setSelectable(false);
    line3->setVisible(true);

    _customPlot->replot();
#endif
}

void CentralWidget::setEventHandlerEnable(const bool flag)
{
    logde<<"setEventHandlerEnable..."<<flag;

    // line visiable func
    auto lineVisiableFunc = [&](QCPItemStraightLine* line){
        line->setSelected(flag);
        line->setVisible(flag);
    };

    // todo. 当竖线隐藏时，需要设置不可选择模式。
    //    _eventHandler->setEnable(flag);

#if 1
    // move line to suitable position.
    double xMax = _customPlot->xAxis->range().upper; // X 轴的最大值

    logde<<"xMax:"<<xMax;

    _line1->point1->setCoords(xMax / 3,_line1->point1->coords().y());
    _line1->point2->setCoords(xMax / 3,_line1->point2->coords().y());

    _line2->point1->setCoords(xMax / 3 * 2,_line2->point1->coords().y());
    _line2->point2->setCoords(xMax / 3 * 2,_line2->point2->coords().y());
#endif
    lineVisiableFunc(_line1);
    if(AnalysisMode::NumericalLabel != _analysisMode){
        lineVisiableFunc(_line2);
    }
    //
    _customPlot->replot();
}

void CentralWidget::drawText(const QPointF point, const QString text)
{
    // 创建标注文字（QCPItemText）
    QCPItemText *textLabel = new QCPItemText(_customPlot);
    textLabel->setPositionAlignment(Qt::AlignBottom | Qt::AlignHCenter);  // 对齐方式
    textLabel->position->setType(QCPItemPosition::ptPlotCoords);        // 使用数据坐标
    textLabel->position->setCoords(point.x() + 20, point.y());  // 设置文本位置在指定点上方

    textLabel->setText(text);  // 设置文本内容
    //    textLabel->setFont(QFont("Arial", 10));
    textLabel->setPen(QPen(Qt::lightGray));  // 文字边框
    textLabel->setBrush(Qt::white);      // 文字背景

    // 创建指向点的线段（QCPItemLine）
    QCPItemLine *arrow = new QCPItemLine(_customPlot);
    arrow->start->setParentAnchor(textLabel->left);  // 线段起点绑定到标注文字底部
    arrow->end->setCoords(point.x(),point.y());  // 线段终点设置为指定的点
    arrow->setHead(QCPLineEnding::esSpikeArrow);  // 添加箭头
    arrow->setPen(QPen(Qt::red, 1));

    // 重绘图表以显示文本标签和箭头
    _customPlot->replot();
}


void CentralWidget::fillGraph(const double x1, const double x2)
{
    //todo.未寻找x1\x2之间最大值。

    double y1 = PointCalculate::getClosestPointByX(x1).y();
    double y2 = PointCalculate::getClosestPointByX(x2).y();

    QVector<double> xVtr,yVtr;
    xVtr.push_back(x1);
    xVtr.push_back(x2);

    yVtr.push_back(y1);
    yVtr.push_back(y2);

    QCPGraph *mainGraph = _customPlot->addGraph();
    mainGraph->setData(xVtr, yVtr);

    // 样式配置
    mainGraph->setPen(QPen(Qt::red, 1));

#if 0
    _currentGraph->setBrush(QBrush(Qt::lightGray));
    _currentGraph->setChannelFillGraph(mainGraph);
#endif

    //    customPlot->graph(0)->setChannelFillGraph(customPlot->graph(1));
    //    _customPlot->graph(1);
    _customPlot->replot();
}

void CentralWidget::clearData(const CentralWidget::ClearDataMode mode)
{
    if(mode == ClearDataMode::All){
        // Clear the data of graph.
#if 0
        if (_customPlot->graphCount() > 0 && _currentGraph)
        {
            _currentGraph->setData(QVector<double>(), QVector<double>());
        }
#endif

        // Set lines visiable false.
        _line1->setVisible(false);
        _line2->setVisible(false);
    }

#if 0
    // Clear filled area.
    if(_currentGraph){
        _currentGraph->setBrush(QBrush(Qt::transparent));
    }

    // Clear graph on plot.
    for (int i = _customPlot->graphCount() - 1; i >= 0; --i) {
        QCPGraph *graph = _customPlot->graph(i);
        if (graph != _currentGraph) {
            _customPlot->removeGraph(graph);
        }
    }
#endif
    // Delete items.
    QList<QCPAbstractItem *> itemsToKeep;
    itemsToKeep  << _line1 << _line2;

    for (int i = _customPlot->itemCount() - 1; i >= 0; --i) {
        QCPAbstractItem *item = _customPlot->item(i);
        if (!itemsToKeep.contains(item)) {
            _customPlot->removeItem(item);
        }
    }

    // 重绘图表以显示更改
    _customPlot->replot();
}

void CentralWidget::clearAllData()
{
    clearData(ClearDataMode::All);
}