#include "PlotRectItem.h"
#include <QPainter>
#include <QwtScaleMap>
PlotRectItem::PlotRectItem(const QString &title)
    : QwtPlotItem(), m_isHovered(false), m_hasPeakData(false)
    ,m_selectionType(""), m_selectionIndex(-1)
{
    setTitle(title);
    setZ(1000);
    // 初始化普通状态画笔：红色虚线，线宽2
    m_normalPen = QPen(Qt::red, 2, Qt::DashLine);
    // 初始化悬停状态画笔：红色实线，线宽2
    m_hoverPen = QPen(Qt::red, 2, Qt::SolidLine);

    m_brush = QBrush(QColor(255, 0, 0, 30));
}

void PlotRectItem::setRect(const QRectF &rect) {
    m_rect = rect;
    itemChanged(); // 触发重绘
}

void PlotRectItem::setPen(const QPen &pen) {
    m_normalPen = pen;
    // 同步悬停画笔的颜色和宽度，仅改变线型
    m_hoverPen = pen;
    m_hoverPen.setStyle(Qt::SolidLine);
    itemChanged();
}

void PlotRectItem::setBrush(const QBrush &brush) {
    m_brush = brush;
    itemChanged();
}

//设置悬停状态
void PlotRectItem::setHovered(bool hovered) {
    if (m_isHovered != hovered) {
        m_isHovered = hovered;
        itemChanged(); // 触发重绘
    }
}

//获取悬停状态
bool PlotRectItem::isHovered() const {
    return m_isHovered;
}

//获取矩形区域
QRectF PlotRectItem::rect() const {
    return m_rect;
}

void PlotRectItem::setPeakData(double center, double fwhm, double area, double baseline)
{
    m_hasPeakData = true;
    m_peakCenter = center;
    m_fwhm = fwhm;
    m_peakArea = area;
    m_baseline = baseline;
    itemChanged(); // 触发重绘
}

void PlotRectItem::draw(QPainter *painter,
                        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
                        const QRectF &) const {
    const int x1 = xMap.transform(m_rect.left());
    const int x2 = xMap.transform(m_rect.right());
    const int y1 = yMap.transform(m_rect.top());
    const int y2 = yMap.transform(m_rect.bottom());
    const QRect rect(QPoint(x1, y1), QPoint(x2, y2));

    painter->save();
    // 根据悬停状态选择画笔
    painter->setPen(m_isHovered ? m_hoverPen : m_normalPen);
    painter->setBrush(m_brush);
    painter->drawRect(rect);
    painter->restore();

    if (m_hasPeakData) {
            painter->save();
            painter->setRenderHint(QPainter::TextAntialiasing);

            // 构建文本内容
            QString text = QString("峰位: %1 keV\n"
                                   "FWHM: %2\n"
                                   "面积: %3\n"
                                   "本底: %4")
                               .arg(m_peakCenter, 0, 'f', 2)
                               .arg(m_fwhm, 0, 'f', 2)
                               .arg(m_peakArea, 0, 'f', 2)
                               .arg(m_baseline, 0, 'f', 2);

            // 计算文本位置：矩形右上角 + 偏移量
            QPoint textPos(x2 + 10, y2);

            // 绘制半透明背景框（增强可读性）
            QFont font = painter->font();
            font.setPointSize(9); // 稍微小一点
            painter->setFont(font);

            QFontMetrics fm(font);
            QRect textRect = fm.boundingRect(QRect(0, 0, 1, 1), Qt::AlignLeft, text);
            textRect.moveTopLeft(textPos);
            textRect.adjust(-5, -3, 5, 3); // 增加边距

            painter->fillRect(textRect, QColor(255, 255, 255, 220)); // 白底微透
            painter->setPen(Qt::black);
            painter->drawText(textRect, Qt::AlignLeft, text);

            painter->restore();
    }
}

QRectF PlotRectItem::boundingRect() const {
    return m_rect;
}