/*
  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.
*/

#include <QtWidgets/QHBoxLayout>
#include <QtWidgets/QLabel>
#include <QtWidgets/QDesktopWidget>
#include <QSize>
#include <QTextDocument>
#include <QSettings>
#include <QPixmap>
#include <QImage>
#include <QPainter>
#include <QFontMetrics>
#include <QBrush>
#include <QPen>
#include <QColor>
#include <QtWidgets/QApplication>
#include <QStaticText>

#include "hoverwindow.h"
#include "smglobals.h"

HoverWindow::HoverWindow(QWidget *parent, Qt::WindowFlags f) : QWidget(parent, f), mAlignCenter(false), mDesktopHeight(-1){
	setVisible(false);
	QSettings s;
	int opacity = s.value("ui/hoveropacity", 7).toInt();
	setWindowOpacity(opacity / 10.0);
	setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);
	setStyleSheet("QLabel { background-color: #D6A583; color: black; border-width: 2px; border-style: solid; padding: 4px; }");
	QDesktopWidget *desktop = qApp->desktop();
	mDesktopHeight = desktop->availableGeometry().height();
	QSize curSize = SmGlobals::instance()->cursorSize();
	setHoverOffset(QPoint(curSize.width() + 30, 0));
	mMainLayout = new QHBoxLayout;
	mMainLayout->setSizeConstraint(QLayout::SetMinAndMaxSize);
	mMainLayout->setContentsMargins(4, 4, 4, 4);
	mLabel = new QLabel;
	mMainLayout->addWidget(mLabel);
	setLayout(mMainLayout);
}

void HoverWindow::setContent(const QString &parent, const QStringList &children){
	mAlignCenter = false;
	QString curText = QString("<p style=\"align: center; text-decoration: underline; font-weight: bold; margin-bottom: 0;\">%1</p>").arg(parent);
	curText.append("<ul style=\"margin-left: -25; margin-top: 0px;\">");
	int count = qMin(6, children.size());
	int i = 0;
	for(i = 0; i < count; ++i){
		curText.append(QString("<li>%1</li>").arg(children.at(i)));
	}
	if(i < children.count()){
		curText.append("<li>...</li>");
	}
	curText.append("</ul>");
	QTextDocument doc;
	doc.setHtml(curText);
	mLabel->setText(curText);
	setMinimumSize(doc.size().width() + 10, doc.size().height() + 10);
	setMaximumSize(doc.size().width() + 10, doc.size().height() + 10);
    raise();
}

void HoverWindow::setPixmap(const QPixmap &pm, bool scale){
	mAlignCenter = true;
	QPixmap curPm = pm;
	if(scale){
		if(curPm.height() > 500){
			curPm = curPm.scaledToHeight(500);
		}
		if(curPm.width() > 300){
			curPm = curPm.scaledToWidth(300);
		}
	}
	mLabel->setPixmap(curPm);
	setMaximumSize(curPm.width() + 10, curPm.height() + 10);
	setMinimumSize(curPm.width() + 10, curPm.height() + 10);
    raise();
}

void HoverWindow::setData(const QList<QVariant> &data){
	if(data.isEmpty()){
		return;
	}
	if(data.at(0).canConvert(QVariant::Pixmap)){
		setPixmap(data.at(0).value<QPixmap>());
		return;
	}
	if(data.size() != 2){
		return;
	}
	QStringList dataList = data.at(1).toStringList();
	if(dataList.isEmpty()){
		dataList << tr("&lt;empty&gt;");
	}
	setContent(data.at(0).toString(), dataList);
}

void HoverWindow::setCaption(const QString &caption){
    const QPixmap *pm = mLabel->pixmap();
	if(!pm){
		return;
    }
	QFontMetrics fm = qApp->fontMetrics();
    QString elidedCap = fm.elidedText(caption, Qt::ElideLeft, pm->size().width() - 18, Qt::TextSingleLine);
    QStaticText myCap(elidedCap);
    QImage img = pm->toImage();
    QPainter *p = new QPainter(&img);
	QColor bgColor(Qt::white);
	p->setBrush(QBrush(bgColor));
	p->setPen(Qt::NoPen);
    p->setOpacity(0.4);
    qreal xStart = (mLabel->width() - myCap.size().width() - 9) / 2.0;
    p->drawRect(QRect(QPoint(xStart, 5), QSize(myCap.size().toSize())));
    p->setOpacity(1.0);
	p->setPen(Qt::black);
    p->drawStaticText(xStart, 5, myCap);
	delete p;
    mLabel->setPixmap(QPixmap::fromImage(img));
}

void HoverWindow::setPos(){
	const QPoint globalPos(QCursor::pos());
	QPoint hoverPos(globalPos.x() + mHoverOffset.x(), globalPos.y() + mHoverOffset.y());
	if(mAlignCenter){
		hoverPos = QPoint(hoverPos.x(), hoverPos.y() - height() / 2);
	}
	if(hoverPos.y() < 0){
		hoverPos = QPoint(hoverPos.x(), 0);
	}
	if(hoverPos.y() + height() > mDesktopHeight){
		hoverPos = QPoint(hoverPos.x(), mDesktopHeight - height());
	}
	move(hoverPos);
}