/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2022 Tianjin KYLIN Information Technology Co., Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */
#include "kylable.h"
#include <QEvent>
#include <QPainter>
#include <QApplication>
#include <QFontMetrics>
#include <QGSettings>
#include <QToolTip>

#define FOREGROUND_COLOR_NORMAL this->palette().text().color()

static inline qreal mixQreal(qreal a, qreal b, qreal bias)
{
    return a + (b - a) * bias;
}


QColor mixColor(const QColor &c1, const QColor &c2, qreal bias)
{
    if (bias <= 0.0) {
        return c1;
    }
    if (bias >= 1.0) {
        return c2;
    }
    if (qIsNaN(bias)) {
        return c1;
    }

    qreal r = mixQreal(c1.redF(),   c2.redF(),   bias);
    qreal g = mixQreal(c1.greenF(), c2.greenF(), bias);
    qreal b = mixQreal(c1.blueF(),  c2.blueF(),  bias);
    qreal a = mixQreal(c1.alphaF(), c2.alphaF(), bias);

    return QColor::fromRgbF(r, g, b, a);
}

FixLabel::FixLabel(QWidget *parent) :
    QLabel(parent)
{
    const QByteArray id("org.ukui.style");
    QGSettings * fontSetting = new QGSettings(id, QByteArray(), this);
    if(QGSettings::isSchemaInstalled(id)){
        connect(fontSetting, &QGSettings::changed,[=](QString key) {
            if ("systemFont" == key || "systemFontSize" ==key) {
                changedLabelSlot();
            }
        });
    }
}


void FixLabel::setLabelText(QString text) {

    mStr = text;
    changedLabelSlot();
}

QString FixLabel::getText(){
    return mStr;
}

void FixLabel::changedLabelSlot() {
    QFontMetrics  fontMetrics(this->font());
    int fontSize = fontMetrics.horizontalAdvance(mStr);
    if (fontSize > this->width()) {
        setText(fontMetrics.elidedText(mStr, Qt::ElideRight, this->width()));
        setToolTip(mStr);
    } else {
        setText(mStr);
        setToolTip("");
    }
}

bool FixLabel::event(QEvent *event)
{
    if (event->type() == QEvent::Paint) {
        QPalette tooltipPal = this->palette();
        tooltipPal.setColor(QPalette::ToolTipBase, this->palette().toolTipBase().color());
        tooltipPal.setColor(QPalette::ToolTipText, this->palette().toolTipText().color());
        QToolTip::setPalette(tooltipPal);
    }
    return QWidget::event(event);
}


KyLable::KyLable(QWidget *parent) : QLabel(parent)
{
    connect(qApp, &QApplication::paletteChanged, this, &KyLable::onPaletteChanged);
    onPaletteChanged();
}

void KyLable::onPaletteChanged()
{
    m_foregroundColor = FOREGROUND_COLOR_NORMAL;
    this->repaint();
}

void KyLable::setPressColor()
{
    QColor hightlight = this->palette().color(QPalette::Active,QPalette::Highlight);
    QColor mix = this->palette().color(QPalette::Active,QPalette::BrightText);
    m_foregroundColor = mixColor(hightlight, mix, 0.2);
}

void KyLable::setHoverColor()
{
//    QColor hightlight = this->palette().color(QPalette::Active,QPalette::Highlight);
//    QColor mix = this->palette().color(QPalette::Active,QPalette::BrightText);
//    m_foregroundColor = mixColor(hightlight, mix, 0.2);
    m_foregroundColor = this->palette().color(QPalette::Active,QPalette::Highlight);
}

void KyLable::setNormalColor()
{
    m_foregroundColor = FOREGROUND_COLOR_NORMAL;
}

void KyLable::paintEvent(QPaintEvent *event)
{
    QPalette pal = this->palette();
    pal.setColor(QPalette::WindowText, m_foregroundColor);
    this->setPalette(pal);
    return QLabel::paintEvent(event);
}

void KyLable::enterEvent(QEvent *event)
{
    setHoverColor();
    this->update();
}

void KyLable::leaveEvent(QEvent *event)
{
    setNormalColor();
    this->update();
}

void KyLable::mousePressEvent(QMouseEvent *event)
{
    setPressColor();
    this->update();
    return QLabel::mousePressEvent(event);
}

void KyLable::mouseReleaseEvent(QMouseEvent *event)
{
    setHoverColor();
    this->update();
    return QLabel::mouseReleaseEvent(event);
}
