/*
 *
 * Copyright (C) 2023, KylinSoft 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 3 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, see <https://www.gnu.org/licenses/>.
 *
 *
 */
#include "result-view-delegate.h"
#include <QPainterPath>
#include <QApplication>
using namespace UkuiSearch;
static ResultItemStyle *global_instance_of_item_style = nullptr;

ResultViewDelegate::ResultViewDelegate(QObject *parent) : QStyledItemDelegate(parent),
    m_textDoc(new QTextDocument(this)),
    m_hightLightEffectHelper(new HightLightEffectHelper(this))
{
    m_textDoc->setDefaultFont(QApplication::font());
    connect(qApp, &QApplication::fontChanged, m_textDoc, &QTextDocument::setDefaultFont);
}

void ResultViewDelegate::setSearchKeyword(const QString &regFindKeyWords)
{
    m_hightLightEffectHelper->setExpression(regFindKeyWords);
}

QSize ResultViewDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QSize size =  QStyledItemDelegate::sizeHint(option,index);
    size.setHeight(size.height() + 10);
    return size;
}

void ResultViewDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index);
    opt.displayAlignment = Qt::Alignment(Qt::AlignLeft|Qt::AlignVCenter);

    QString text = opt.text;
    opt.text = QString();

    QStyle *style = opt.widget->style();
    style->proxy()->drawControl(QStyle::CE_ItemViewItem, &opt, painter, opt.widget); //绘制非文本区域内容

    QRect textRect = style->subElementRect(QStyle::SE_ItemViewItemText, &opt, opt.widget);
    QFontMetrics fontMetrics(opt.font);
    text = fontMetrics.elidedText(text, Qt::ElideRight, textRect.width() - m_textDoc->documentMargin() - 1); //富余5px的宽度
    opt.text = text;

    painter->save();
    if(opt.state & QStyle::State_Selected) {
        m_hightLightEffectHelper->setTextColor(QBrush(opt.palette.highlightedText().color()));
    } else {
        m_hightLightEffectHelper->setTextColor(QBrush(opt.palette.text().color()));
    }

    m_textDoc->setPlainText(text);
    m_hightLightEffectHelper->setDocument(m_textDoc);
    m_hightLightEffectHelper->rehighlight();

    painter->translate(textRect.x(), textRect.y() + (textRect.height() - fontMetrics.height()) / 2 - m_textDoc->documentMargin());
    m_textDoc->drawContents(painter);
    painter->restore();
}

ResultItemStyle *ResultItemStyle::getStyle()
{
    if (!global_instance_of_item_style) {
        global_instance_of_item_style = new ResultItemStyle;
    }
    return global_instance_of_item_style;
}

int ResultItemStyle::styleHint(QStyle::StyleHint hint, const QStyleOption *option, const QWidget *widget, QStyleHintReturn *returnData) const
{
    switch (hint) {
    case SH_ItemView_ActivateItemOnSingleClick:
        return false;
    default:
        return qApp->style()->styleHint(hint, option, widget, returnData);
    }
}

//void ResultItemStyle::drawPrimitive(QStyle::PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
//{
//    switch (element) {
//        case PE_PanelItemViewItem: {

//            bool isIconView = false;
//            auto opt = qstyleoption_cast<const QStyleOptionViewItem *>(option);
//            if (!opt)
//                return;
//            if (opt) {
//                isIconView = (opt->decorationPosition & QStyleOptionViewItem::Top);
//            }

//            bool isHover = (option->state & State_MouseOver) && (option->state & ~State_Selected);
//            bool isSelected = option->state & State_Selected;
//            bool enable = option->state & State_Enabled;
//            QColor color = option->palette.color(enable? QPalette::Active: QPalette::Disabled, QPalette::Highlight);

//            if (isSelected) {
//                color.setAlpha(255);
//            } else if (isHover) {
//    //            color = opt->palette.color(QPalette::Active, QPalette::BrightText);
//    //            color.setAlpha(0.05);
//                color = QColor(241, 241, 241);
//            } else {
//                color.setAlpha(0);
//            }
//            QPainterPath path;

//            if(opt->viewItemPosition == QStyleOptionViewItem::OnlyOne) {
//                path.addRoundedRect(option->rect, 6, 6);
//            } else if(opt->viewItemPosition == QStyleOptionViewItem::Beginning) {
//                //一个左侧有两个圆角的矩形
//                path.moveTo(option->rect.topLeft() + QPoint(6, 0));
//                path.cubicTo(option->rect.topLeft() + QPoint(6, 0),
//                             option->rect.topLeft(), option->rect.topLeft() +
//                             QPoint(0, 6));

//                path.lineTo(option->rect.bottomLeft() - QPoint(0, 6));
//                path.cubicTo(option->rect.bottomLeft() - QPoint(0, 6),
//                             option->rect.bottomLeft() + QPoint(0, 1),
//                             option->rect.bottomLeft() + QPoint(6, 1));

//                path.lineTo(option->rect.bottomRight() + QPoint(1, 1));
//                path.lineTo(option->rect.topRight()+ QPoint(1, 0));
//                path.lineTo(option->rect.topLeft() + QPoint(6, 0));
//            } else if(opt->viewItemPosition == QStyleOptionViewItem::Middle) {
//                path.addRect(option->rect.adjusted(-1, 0, 1, 0));
//            } else if(opt->viewItemPosition == QStyleOptionViewItem::End) {
//                //一个右侧有两个圆角的矩形
//                path.moveTo(option->rect.topRight() + QPoint(-6, 0));
//                path.cubicTo(option->rect.topRight() + QPoint(-6, 0),
//                             option->rect.topRight(),
//                             option->rect.topRight() +
//                             QPoint(0, 6));

//                path.lineTo(option->rect.bottomRight() - QPoint(0, 6));
//                path.cubicTo(option->rect.bottomRight() - QPoint(0, 6),
//                             option->rect.bottomRight() + QPoint(0, 1),
//                             option->rect.bottomRight() + QPoint(-6, 1));

//                path.lineTo(option->rect.bottomLeft() + QPoint(0, 1));
//                path.lineTo(option->rect.topLeft());
//                path.lineTo(option->rect.topRight() + QPoint(-6, 0));
//            } else {
//                //                    path.addRoundedRect(option->rect, 8, 8);
//            }

//            painter->save();
//            painter->setRenderHint(QPainter::Antialiasing);
//            painter->setPen(Qt::NoPen);
//            painter->setBrush(color);
//            painter->drawPath(path);
//            //            painter->fillPath(path, painter->brush());

//            painter->restore();
//            break;
//        }
//        default:
//            break;
////            return QProxyStyle::drawPrimitive(element, option, painter, widget);
//        }

//}

//void ResultItemStyle::drawControl(QStyle::ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
//{
//    switch (element) {
//    case CE_ItemViewItem: {
//        if (const QStyleOptionViewItem *vopt = qstyleoption_cast<const QStyleOptionViewItem *>(option)) {
//            painter->save();
//            if (painter->clipPath().isEmpty()) {
//                painter->setClipRect(option->rect);
//            }

//            QRect checkRect = proxy()->subElementRect(SE_ItemViewItemCheckIndicator, vopt, widget);
//            QRect iconRect = proxy()->subElementRect(SE_ItemViewItemDecoration, vopt, widget);

//            // draw the background
//            proxy()->drawPrimitive(PE_PanelItemViewItem, option, painter, widget);

//            // draw the check mark
//            if (vopt->features & QStyleOptionViewItem::HasCheckIndicator) {
//                QStyleOptionViewItem option(*vopt);
//                option.rect = checkRect;
//                option.state = option.state & ~QStyle::State_HasFocus;

//                switch (vopt->checkState) {
//                case Qt::Unchecked:
//                    option.state |= QStyle::State_Off;
//                    break;
//                case Qt::PartiallyChecked:
//                    option.state |= QStyle::State_NoChange;
//                    break;
//                case Qt::Checked:
//                    option.state |= QStyle::State_On;
//                    break;
//                default:
//                    break;
//                }
//                proxy()->drawPrimitive(QStyle::PE_IndicatorViewItemCheck, &option, painter, widget);
//            }

//            // draw the icon
//            QIcon::Mode mode = QIcon::Normal;
//            if (!(vopt->state & QStyle::State_Enabled)) {
//                mode = QIcon::Disabled;
//            } else if (vopt->state & QStyle::State_Selected) {
//                mode = QIcon::Selected;
//            }
//            QIcon::State state = vopt->state & QStyle::State_Open ? QIcon::On : QIcon::Off;
//            auto pixmap = vopt->icon.pixmap(vopt->decorationSize, mode, state);

//            iconRect.moveLeft(8);
//            QStyle::drawItemPixmap(painter, iconRect, vopt->decorationAlignment, pixmap);
//            painter->restore();
//            return;
//        }
//        break;
//    }
//    default:
//        break;
//    }
//}

HightLightEffectHelper::HightLightEffectHelper(QObject *parent) : QSyntaxHighlighter(parent)
{
    m_expression.setCaseSensitivity(Qt::CaseInsensitive);
    m_expression.setPatternSyntax(QRegExp::FixedString);
}

void HightLightEffectHelper::setExpression(const QString &text)
{
    m_expression.setPattern(text);
}

void HightLightEffectHelper::setTextColor(const QBrush &brush)
{
    m_textCharFormat.setForeground(brush);
}

void HightLightEffectHelper::highlightBlock(const QString &text)
{
    setFormat(0, text.length(), m_textCharFormat);
    m_textCharFormat.setFontWeight(QFont::Bold);
    int index = text.indexOf(m_expression);
    while(index >= 0){
        int length = m_expression.matchedLength();
        setFormat(index, length, m_textCharFormat);
        index = text.indexOf(m_expression, index+length);
    }
    m_textCharFormat.setFontWeight(QFont::Normal);
}