#include "FrequentShower.h"
#include <QPainter>
#include <QDebug>
#include <QKeyEvent>
#include "../Global.h"




FrequentShower::FrequentShower(QWidget *parent) : QWidget(parent) {
    setObjectName("设置频率值控件");
    setFrequent(BackEnd::instance()->YsGetFreq());
}

void FrequentShower::paintEvent(QPaintEvent *event) {
    QPainter painter(this);
    QFont font;
    font.setPointSize(calculateOptimalFontSize(mFrequent, {(int)((double)width() * 0.9), height()}, font));
    painter.setFont(font);
    painter.setPen(Qt::black);
    painter.drawText(rect(), Qt::AlignCenter, mFrequent);
    QFontMetrics fontMetrics(font);
    if (selectIndex >= 0 && selectIndex < mFrequent.length()) {
        int a = (QWidget::width() - fontMetrics.horizontalAdvance(mFrequent)) / 2;
        int startX = a + fontMetrics.horizontalAdvance(mFrequent.mid(0, selectIndex));
        int w = fontMetrics.horizontalAdvance(mFrequent[selectIndex]);
        painter.fillRect(startX, 0, w, QWidget::height(), Qt::black);
        painter.setPen(Qt::white);
        painter.drawText(QRect(startX, 0, w, QWidget::height()),  Qt::AlignCenter, QString(mFrequent[selectIndex]));
    }

}

void FrequentShower::keyPressEvent(QKeyEvent *event) {
    BackEnd* g = BackEnd::instance();

    QString keyText = event->text();
    if (keyText >= "0" && keyText <= "9") {
        mFrequent[selectIndex] = keyText.at(0).toLatin1();
        update();
        return;
    }
    if (g->match(event, "左移")) {
        move(-1);
    } else if (g->match(event, "右移")) {
        move(1);
    } else if (g->match(event, "增加")) {
        change(1);
    } else if (g->match(event, "减小")) {
        change(-1);
    }
    event->ignore();

}

void FrequentShower::move(int num) {
    selectIndex += num;
    if(selectIndex < 0) {
        selectIndex = 0;
    } else if(selectIndex >= mFrequent.length()) {
        selectIndex = mFrequent.length() - 1;
    }
    if(mFrequent[selectIndex] == '.') {
        if(num > 0) {
            selectIndex++;
        } else {
            selectIndex--;
        }
    }
    update();
}

void FrequentShower::change(int num) {
    if (selectIndex >= 0 && selectIndex < mFrequent.length()) {
        int n = mFrequent[selectIndex].digitValue();
        n += num;
        if (n < 0) {
            n = 9;
        } else if (n > 9) {
            n = 0;
        }
        mFrequent[selectIndex] = QString::number(n)[0];
        update();
        BackEnd::instance()->YsSetFreq(QString(mFrequent).replace('.', "").toULongLong());
    }
}

void FrequentShower::setFrequent(quint64 frequent) {
    QString strNumber = QString::number(frequent, 10);
    int padding = 11 - strNumber.length();
    if (padding > 0) {
        strNumber = QString(padding, '0') + strNumber;
    }
    mFrequent = QString("%1.%2.%3.%4").arg(
                strNumber.mid(0, 2),
                strNumber.mid(2, 3),
                strNumber.mid(5, 3),
                strNumber.mid(8, 3)
            );
//    qDebug() << strNumber << "   " << mFrequent;
    update();
}