#include "CurvePlotWidget.h"


#include <QVBoxLayout>

using namespace QtCharts;   // 只在 cpp 里用，头文件里不要 using
// 放在 CurvePlotWidget.cpp 顶部
static void syncChartFontsAndColors(QChart *chart, const QWidget *host)
{
    if (!chart || !host) return;

    // 1. 坐标轴
    for (auto *axis : chart->axes()) {
        axis->setLabelsFont(host->font());
        axis->setLabelsColor(host->palette().color(QPalette::WindowText));
        axis->setTitleFont(host->font());
        axis->setTitleBrush(QBrush(host->palette().color(QPalette::WindowText)));
    }

    // 2. 图例
    if (auto *legend = chart->legend()) {
        legend->setFont(host->font());
        legend->setLabelColor(host->palette().color(QPalette::WindowText));
    }

    // 3. 标题（虽然已隐藏，也顺手同步）
    chart->setTitleFont(host->font());
    chart->setTitleBrush(QBrush(host->palette().color(QPalette::WindowText)));
}
CurvePlotWidget::CurvePlotWidget(QWidget *parent)
    : QWidget(parent)
{
    initChart();
}
void CurvePlotWidget::changeEvent(QEvent *e)
{
    QWidget::changeEvent(e);
    if (e->type() == QEvent::FontChange || e->type() == QEvent::PaletteChange)
        syncChartFontsAndColors(m_chart, this);
}
void CurvePlotWidget::initChart()
{
    m_chart = new QChart;
    m_chart->setTitle("");                 // 无标题
    m_chart->setMargins(QMargins(0,0,0,0)); // 关键：外框 0
    m_chart->layout()->setContentsMargins(0,0,0,0);
    m_chart->setBackgroundRoundness(0);
    m_chart->setBackgroundVisible(false);
    m_chart->legend()->setVisible(true);        // 先隐藏图例，想显示时再 true

    /* ---------- X 轴：当前时间 ---------- */
    m_axisX = new QDateTimeAxis;
    m_axisX->setFormat("hh:mm:ss");              // 时分秒
    m_axisX->setTitleText("");          // 不显示轴标题
    m_axisX->setLabelsVisible(true);   // 不显示刻度数字

    /* ---------- Y 轴 ---------- */
    m_axisY = new QValueAxis;
    m_axisY->setRange(-10, 10);
    m_axisY->setTitleText("");          // 不显示轴标题
    m_axisY->setLabelsVisible(true);   // 不显示刻度数字

    m_chart->addAxis(m_axisX, Qt::AlignBottom);
    m_chart->addAxis(m_axisY, Qt::AlignLeft);

    /* 3. 视图 */
    m_view = new QChartView(m_chart);
    m_view->setRenderHint(QPainter::Antialiasing);
    m_view->setBackgroundBrush(Qt::NoBrush);
    m_view->setFrameShape(QFrame::NoFrame);
    m_view->setContentsMargins(0,0,0,0);    // 视图本身无留白

    /* 4. 布局 */
    QVBoxLayout *lay = new QVBoxLayout(this);
    lay->setContentsMargins(0,0,0,0);       // 父布局无留白
    lay->setSpacing(0);                     // 间距也 0
    lay->addWidget(m_view);
}

int CurvePlotWidget::addSeries(const QString &name, const QColor &color)
{
    QLineSeries *series = new QLineSeries;
    series->setName(name);
    series->setColor(color);
    series->setUseOpenGL(true);

    m_chart->addSeries(series);
    series->attachAxis(m_axisX);
    series->attachAxis(m_axisY);
    m_series.append(series);
    return m_series.size() - 1;
}

void CurvePlotWidget::appendPoint(int seriesIndex, double yValue)
{
    if (seriesIndex < 0 || seriesIndex >= m_series.size())
        return;

    qint64 nowMs = QDateTime::currentMSecsSinceEpoch();
    m_series[seriesIndex]->append(nowMs, yValue);

//    if (m_series[seriesIndex]->count() > MAX_POINTS)
//        m_series[seriesIndex]->remove(0);

    updateAxisRange();
}

void CurvePlotWidget::updateAxisRange()
{
    qreal minY =  1e9, maxY = -1e9;
    for (QLineSeries *s : qAsConst(m_series)) {
        const auto pts = s->pointsVector();
        for (const QPointF &p : pts) {
            minY = qMin(minY, p.y());
            maxY = qMax(maxY, p.y());
        }
    }
    if (minY == 1e9) minY = -10;
    if (maxY == -1e9) maxY = 10;
    m_axisY->setRange(minY - 1, maxY + 1);
    /* X 轴：最近 TIME_WINDOW_S 秒 */
   qint64 now = QDateTime::currentMSecsSinceEpoch();
   m_axisX->setRange(QDateTime::fromMSecsSinceEpoch(now - TIME_WINDOW_S * 1000),
                     QDateTime::fromMSecsSinceEpoch(now));
}