#include "EnergyCountPeakFitView.h"
#include "CustomQwtPlot.h"
#include "csv.h"
#include <GlobalDefine.h>
#include <QHBoxLayout>
#include <QMenu>
#include <QwtLegend>
#include <QwtPlotCanvas>
#include <QwtPlotCurve>
#include <QwtPlotMarker>
#include <QwtScaleMap>
#include <QwtText>
#include <QDialog>
#include <QPushButton>
#include <QCheckBox>
#include <QwtScaleDiv>
#include <QFileInfo>
#include "PlotRectItem.h"


EnergyCountPeakFitView::EnergyCountPeakFitView(QWidget *parent)
    : MeasureAnalysisView { parent }
{
    this->setViewType(PlotFrame);

    QHBoxLayout* layout = new QHBoxLayout(this);
    this->_plot = new CustomQwtPlot(this);
    layout->addWidget(this->_plot);
    setupPlot();
    this->_menu = new QMenu(this);
    setupMenu();
}

EnergyCountPeakFitView::~EnergyCountPeakFitView()
{
    LOG_DEBUG(QStringLiteral(u"%1析构.").arg(this->GetViewName()));
    delete _rubberBand;
     clearAllSelectionRects();
}

void EnergyCountPeakFitView::InitViewWorkspace(const QString &project_name)
{
    Q_UNUSED(project_name);
}

void EnergyCountPeakFitView::SetAnalyzeDataFilename(const QMap<QString, QVariant> &data_files_set)
{
    if ( !data_files_set.isEmpty() ) {
        const QString& data_name = data_files_set.firstKey();
        const QString& data_filename = data_files_set.first().toString();
        if (QFileInfo(data_filename).exists()) {
            loadDataFromFile(data_name, data_filename);
        }
    }
}

void EnergyCountPeakFitView::setupPlot()
{
    _plot->setCanvasBackground(Qt::white);
    QwtPlotCanvas* canvas = qobject_cast<QwtPlotCanvas*>(_plot->canvas());
    canvas->setFrameStyle(QFrame::NoFrame);

    QFont font = this->font();
    font.setBold(false);
    QwtText energy_label = QStringLiteral(u"能量(KeV)");
    energy_label.setFont(font);
    QwtText count_label = QStringLiteral(u"计数");
    count_label.setFont(font);
    _plot->setAxisTitle(QwtPlot::xBottom, energy_label);
    _plot->setAxisTitle(QwtPlot::yLeft, count_label);

    // set axis auto scale
    _plot->setAxisAutoScale(QwtPlot::xBottom, true);
    _plot->setAxisAutoScale(QwtPlot::yLeft, true);

    _plot->enableAxis(QwtPlot::xBottom);
    _plot->enableAxis(QwtPlot::yLeft);

    // 设置QWT图例
    // QwtLegend* legend = new QwtLegend();
    // legend->setDefaultItemMode(QwtLegendData::ReadOnly);
    // _plot->insertLegend(legend, QwtPlot::RightLegend);

    _plot->SetAxisDragScale(QwtPlot::xBottom, true);


    _data_selector = new CustomQwtPlotXaxisSelector(_plot->canvas());
    _data_selector->setEnabled(false);

    // 启用鼠标追踪，并安装事件过滤器
    _plot->canvas()->setMouseTracking(true);
    _plot->canvas()->installEventFilter(this);
}

void EnergyCountPeakFitView::setupMenu()
{
    this->setContextMenuPolicy(Qt::CustomContextMenu);
    connect(this, &EnergyCountPeakFitView::customContextMenuRequested, [this](const QPoint& pos) {
        this->_menu->exec(this->mapToGlobal(pos));
    });
    QAction* action_plot_reset = this->_menu->addAction(QStringLiteral(u"还原"));
    action_plot_reset->setObjectName("plot_reset");
    connect(action_plot_reset, &QAction::triggered, [this]() {
        this->_plot->ResetPlot();
    });
    this->_menu->addSeparator();
    QAction* action_set_curve_show = this->_menu->addAction(QStringLiteral(u"选择曲线"));
    action_set_curve_show->setObjectName("curve_show_setting");
    connect(action_set_curve_show, &QAction::triggered, this, &EnergyCountPeakFitView::onActionCurveShowSetting);
    QAction* action_plot_config = this->_menu->addAction(QStringLiteral(u"图表配置"));
    action_plot_config->setObjectName("plot_config");
    connect(action_plot_config, &QAction::triggered, this, &EnergyCountPeakFitView::onActionPlotConfigure);

    this->_menu->addSeparator();
    QAction* action_clear_rect = this->_menu->addAction(QStringLiteral(u"清除框选标记"));
    connect(action_clear_rect, &QAction::triggered, this, &EnergyCountPeakFitView::clearAllSelectionRects);

    QAction* action_hint = this->_menu->addAction(QStringLiteral(u"框选提示：按住 Ctrl 键并拖动左键"));
    action_hint->setEnabled(false);
}

void EnergyCountPeakFitView::loadDataFromFile(const QString &data_name, const QString &filename)
{
    std::string address_str = QString(QStringLiteral(u"能量(KeV)")).toStdString();
    std::string count_str = QString(QStringLiteral(u"计数")).toStdString();

    io::CSVReader<
        2,
        io::trim_chars<' ', '\t'>,
        io::double_quote_escape<',', '"'>,
        io::throw_on_overflow,
        io::empty_line_comment>
        reader(QStrToSysPath(filename));
    reader.read_header(io::ignore_extra_column, address_str, count_str);

    double energy;
    unsigned long long energy_count;
    QVector<double> x, y;
    while (reader.read_row(energy, energy_count)) {
        x.push_back(energy);
        y.push_back(energy_count);
    }
    // 绘制曲线
    QwtPlotCurve* curve = new QwtPlotCurve(data_name);
    curve->setSamples(x, y);
    _plot->AddCurve(curve);
}

void EnergyCountPeakFitView::onActionCurveShowSetting()
{
    if (!_curve_show_setting_dlg) {
        _curve_show_setting_dlg = new QDialog(this, Qt::Dialog | Qt::WindowCloseButtonHint);
        _curve_show_setting_dlg->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
        _curve_show_setting_dlg->setSizeGripEnabled(false);
        _curve_show_setting_dlg->setWindowTitle(QString(QStringLiteral(u"选择%1曲线显示").arg(this->_plot->title().text())));
        _curve_show_setting_dlg->setWindowModality(Qt::WindowModal);
        _curve_show_setting_dlg->setModal(false);
        QVBoxLayout* layout = new QVBoxLayout(_curve_show_setting_dlg);

        QStringList curve_name_list;
        for (QwtPlotCurve* curve : this->_plot->GetCurveList()) {
            curve_name_list.append(curve->title().text());
        }
        // 自动计算多列排布
        int num_columns = std::sqrt(this->_plot->GetCurveList().size());
        if (num_columns == 0)
            num_columns = 1;
        QVBoxLayout* checkbox_layout = new QVBoxLayout();
        QHBoxLayout* checkbox_column_layout = new QHBoxLayout();
        QMap<QwtPlotCurve*, QCheckBox*> curve_checkbox_map;
        auto addCurveToLayout = [&](const QString& curve_name){
            QwtPlotCurve* curve = this->_plot->GetCurve(curve_name);
            QCheckBox* check_box = new QCheckBox(curve->title().text());
            check_box->setChecked(curve->isVisible());
            checkbox_column_layout->addWidget(check_box);
            connect(check_box, &QCheckBox::stateChanged, [curve](int state) {
                curve->setVisible(state == Qt::Checked);
                curve->plot()->replot();
            });
            curve_checkbox_map[curve] = check_box;
            if (checkbox_column_layout->count() >= num_columns) {
                checkbox_layout->addLayout(checkbox_column_layout);
                checkbox_column_layout = new QHBoxLayout();
            }
        };
        for (const QString& ch_name : curve_name_list) {
            addCurveToLayout(ch_name);
        }
        if (checkbox_column_layout->count() < num_columns) {
            checkbox_column_layout->addStretch();
        }
        checkbox_layout->addLayout(checkbox_column_layout);
        // 全选和反选
        auto curveCheckboxUpdate = [this, curve_checkbox_map]() {
            for (QwtPlotCurve* curve : this->_plot->GetCurveList()) {
                curve_checkbox_map[curve]->setChecked(curve->isVisible());
            }
        };
        QHBoxLayout* button_layout = new QHBoxLayout();
        QPushButton* btn_all_select = new QPushButton(QString(QStringLiteral(u"全选")));
        connect(btn_all_select, &QPushButton::clicked, [this, curveCheckboxUpdate]() {
            for (QwtPlotCurve* curve : this->_plot->GetCurveList()) {
                curve->setVisible(true);
            }
            curveCheckboxUpdate();
            this->_plot->replot();
        });
        button_layout->addWidget(btn_all_select);
        QPushButton* btn_reserve_select = new QPushButton(QString(QStringLiteral(u"反选")));
        connect(btn_reserve_select, &QPushButton::clicked, [this, curveCheckboxUpdate]() {
            for (QwtPlotCurve* curve : this->_plot->GetCurveList()) {
                curve->setVisible(!curve->isVisible());
            }
            curveCheckboxUpdate();
            this->_plot->replot();
        });
        button_layout->addWidget(btn_reserve_select);

        layout->addLayout(button_layout);
        layout->addLayout(checkbox_layout);
    }
    _curve_show_setting_dlg->show();
}

void EnergyCountPeakFitView::onActionPlotConfigure()
{

}



void EnergyCountPeakFitView::clearAllSelectionRects()
{
    for (PlotRectItem* item : _selectionRectItems) {
           if (item) {
               item->detach();
               delete item;
           }
       }
       _selectionRectItems.clear();
       _plot->replot();
}

bool EnergyCountPeakFitView::eventFilter(QObject* watched, QEvent* event)
{
    if (watched == _plot->canvas()) {
           QMouseEvent* me = static_cast<QMouseEvent*>(event);

           // 按下 Ctrl+左键 开始框选
           if (event->type() == QEvent::MouseButtonPress &&
               me->button() == Qt::LeftButton &&
               (me->modifiers() & Qt::ControlModifier)) {
               startSelection(me->pos());
               return true;
           }
           // 移动时更新橡皮筋
           else if (event->type() == QEvent::MouseMove && _isSelecting) {
               updateSelection(me->pos());
               return true;
           }
           // 释放左键完成框选
           else if (event->type() == QEvent::MouseButtonRelease &&
                    me->button() == Qt::LeftButton && _isSelecting) {
               finishSelection();
               return true;
           }
       }
       return MeasureAnalysisView::eventFilter(watched, event);
}

void EnergyCountPeakFitView::startSelection(const QPoint& pos)
{
    _isSelecting = true;
   _selectionStart = pos;

   if (!_rubberBand) {
       _rubberBand = new QRubberBand(QRubberBand::Rectangle, _plot->canvas());
   }
   _rubberBand->setGeometry(QRect(pos, QSize()));
   _rubberBand->show();
}

void EnergyCountPeakFitView::updateSelection(const QPoint& pos)
{
    if (!_rubberBand) return;
    // 计算矩形（归一化）
    QRect rect = QRect(_selectionStart, pos).normalized();
    _rubberBand->setGeometry(rect);
}

void EnergyCountPeakFitView::finishSelection()
{
    if (_rubberBand) {
        QRect finalRect = _rubberBand->geometry();
        _rubberBand->hide();
        if (finalRect.width() > 2 && finalRect.height() > 2) {
            QRectF plotRect = pixelRectToPlotRect(finalRect);
            addSelectionRect(plotRect);   // 直接添加，不清除旧的
            // TODO: 在此处添加峰拟合逻辑
            // ========== 新增拟合逻辑 ==========
            QList<QwtPlotCurve*> curves = _plot->GetCurveList();
           if (curves.isEmpty()) return;
           QwtPlotCurve* originalCurve = curves.first();

           // 获取原始数据
           QVector<double> origX, origY;
           for (size_t i = 0; i < originalCurve->dataSize(); ++i) {
               origX.push_back(originalCurve->sample(i).x());
               origY.push_back(originalCurve->sample(i).y());
           }

           // 提取框内的点
           QVector<double> roiX, roiY;
           for (int i = 0; i < origX.size(); ++i) {
               if (origX[i] >= plotRect.left() && origX[i] <= plotRect.right() &&
                   origY[i] >= plotRect.bottom() && origY[i] <= plotRect.top()) {
                   roiX.push_back(origX[i]);
                   roiY.push_back(origY[i]);
               }
           }

            if (roiX.size() >= 3)
            {


            }
        }
    }

    _isSelecting = false;
}

QRectF EnergyCountPeakFitView::pixelRectToPlotRect(const QRect& pixelRect) const
{
    const QwtScaleMap xMap = _plot->canvasMap(QwtPlot::xBottom);
    const QwtScaleMap yMap = _plot->canvasMap(QwtPlot::yLeft);

    double x1 = xMap.invTransform(pixelRect.left());
    double x2 = xMap.invTransform(pixelRect.right());
    double y1 = yMap.invTransform(pixelRect.top());
    double y2 = yMap.invTransform(pixelRect.bottom());

    return QRectF(QPointF(x1, y1), QPointF(x2, y2)).normalized();
}

void EnergyCountPeakFitView::addSelectionRect(const QRectF &plotRect)
{
    PlotRectItem* rectItem = new PlotRectItem("Selection");
       rectItem->setAxes(QwtPlot::xBottom, QwtPlot::yLeft);
       rectItem->setRect(plotRect);
       rectItem->attach(_plot);
       _selectionRectItems.append(rectItem);
       _plot->replot();
}