///////////////////////////////////////////////////////////////////////////////
// LameXP - Audio Encoder Front-End
// Copyright (C) 2004-2018 LoRd_MuldeR <MuldeR2@GMX.de>
//
// 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, but always including the *additional*
// restrictions defined in the "License.txt" file.
//
// 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// http://www.gnu.org/licenses/gpl-2.0.txt
///////////////////////////////////////////////////////////////////////////////

#include "Dialog_DropBox.h"

#include "UIC_DropBox.h"

//Internal
#include "Global.h"
#include "Model_Settings.h"

//MUtils
#include <MUtils/Global.h>

//Qt
#include <QThread>
#include <QMovie>
#include <QKeyEvent>
#include <QDesktopWidget>
#include <QToolTip>
#include <QTimer>

#define EPS (1.0E-5)
#define SET_FONT_BOLD(WIDGET,BOLD) { QFont _font = (WIDGET)->font(); _font.setBold(BOLD); (WIDGET)->setFont(_font); }

static QRect SCREEN_GEOMETRY(void)
{
	QDesktopWidget *desktop = QApplication::desktop();
	return (desktop->isVirtualDesktop() ? desktop->screen()->geometry() : desktop->availableGeometry());
}

static const double LOW_OPACITY = 0.85;

////////////////////////////////////////////////////////////
// Constructor
////////////////////////////////////////////////////////////

DropBox::DropBox(QWidget *parent, QAbstractItemModel *model, SettingsModel *settings)
:
QDialog(parent, Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint),
	ui(new Ui::DropBox),
	m_model(model),
	m_settings(settings),
	m_moving(false),
	m_screenGeometry(SCREEN_GEOMETRY()),
	m_firstShow(true)
{
	//Init the dialog, from the .ui file
	ui->setupUi(this);

	//Init counter
	m_counterLabel = new QLabel(this);
	m_counterLabel->setParent(ui->dropBoxLabel);
	m_counterLabel->setText("0");
	m_counterLabel->setAlignment(Qt::AlignHCenter | Qt::AlignTop);
	SET_FONT_BOLD(m_counterLabel, true);

	m_windowReferencePoint = new QPoint;
	m_mouseReferencePoint = new QPoint;

	//Prevent close
	m_canClose = false;

	//Make transparent
	setAttribute(Qt::WA_TranslucentBackground);
	setWindowOpacity(LOW_OPACITY);

	//Translate UI
	QEvent languageChangeEvent(QEvent::LanguageChange);
	changeEvent(&languageChangeEvent);
}

////////////////////////////////////////////////////////////
// Destructor
////////////////////////////////////////////////////////////

DropBox::~DropBox(void)
{
	if(!m_firstShow)
	{
		m_settings->dropBoxWidgetPositionX(this->x());
		m_settings->dropBoxWidgetPositionY(this->y());
	}

	MUTILS_DELETE(m_counterLabel);
	MUTILS_DELETE(m_windowReferencePoint);
	MUTILS_DELETE(m_mouseReferencePoint);
	MUTILS_DELETE(ui);
}

////////////////////////////////////////////////////////////
// PUBLIC SLOTS
////////////////////////////////////////////////////////////

void DropBox::modelChanged(void)
{
	if(m_model)
	{
		m_counterLabel->setText(QString::number(m_model->rowCount()));
	}
}

////////////////////////////////////////////////////////////
// EVENTS
////////////////////////////////////////////////////////////

/*
 * Re-translate the UI
 */
void DropBox::changeEvent(QEvent *e)
{
	if(e->type() == QEvent::LanguageChange)
	{
		ui->retranslateUi(this);
		ui->dropBoxLabel->setToolTip(QString("<b>%1</b><br><nobr>%2</nobr><br><nobr>%3</nobr>").arg(tr("LameXP DropBox"), tr("You can add files to LameXP via Drag&amp;Drop here!"), tr("(Right-click to close the DropBox)")));
	}
}

void DropBox::showEvent(QShowEvent *event)
{
	m_screenGeometry = SCREEN_GEOMETRY();
	setFixedSize(ui->dropBoxLabel->pixmap()->size());
	
	m_counterLabel->setGeometry(0, ui->dropBoxLabel->height() - 30, ui->dropBoxLabel->width(), 25);

	if(m_firstShow)
	{
		m_firstShow = false;
		int pos_x = m_settings->dropBoxWidgetPositionX();
		int pos_y = m_settings->dropBoxWidgetPositionY();
		if((pos_x < 0) && (pos_y < 0))
		{
			QWidget *const parentWidget = dynamic_cast<QWidget*>(this->parent());
			QWidget *const targetWidget = parentWidget ? parentWidget : this;
			QRect availGeometry = QApplication::desktop()->availableGeometry(targetWidget);
			pos_x = availGeometry.width()  - frameGeometry().width()  + availGeometry.left();
			pos_y = availGeometry.height() - frameGeometry().height() + availGeometry.top();
		}
		else
		{
			pos_x = qBound(0, pos_x, m_screenGeometry.width()  - frameGeometry().width());
			pos_y = qBound(0, pos_y, m_screenGeometry.height() - frameGeometry().height());
		}
		move(pos_x, pos_y);
	}

	if(m_moving)
	{
		QApplication::restoreOverrideCursor();
		m_moving = false;
		setWindowOpacity(LOW_OPACITY);
	}

	boundWidget(this);
}

void DropBox::keyPressEvent(QKeyEvent *event)
{
	event->ignore();
}

void DropBox::keyReleaseEvent(QKeyEvent *event)
{
	event->ignore();
}

void DropBox::closeEvent(QCloseEvent *event)
{
	if(!m_canClose)
	{
		event->ignore();
	}
}

void DropBox::mousePressEvent(QMouseEvent *event)
{
	if(m_moving)
	{
		event->ignore();
		return;
	}
	
	if(event->button() == Qt::RightButton)
	{
		hide();
		if(m_settings) m_settings->dropBoxWidgetEnabled(false);
		return;
	}
	
	m_screenGeometry = SCREEN_GEOMETRY();
	QApplication::setOverrideCursor(Qt::SizeAllCursor);
	*m_windowReferencePoint = this->pos();
	*m_mouseReferencePoint = event->globalPos();
	m_moving = true;
	setWindowOpacity(1.0);
}

void DropBox::mouseReleaseEvent(QMouseEvent *event)
{
	if(m_moving && event->button() != Qt::RightButton)
	{
		boundWidget(this);
		QApplication::restoreOverrideCursor();
		setWindowOpacity(LOW_OPACITY);
		m_settings->dropBoxWidgetPositionX(this->x());
		m_settings->dropBoxWidgetPositionY(this->y());
		m_moving = false;
	}
}

void DropBox::mouseMoveEvent(QMouseEvent *event)
{
	if(!m_moving)
	{
		return;
	}
		
	const int delta_x = m_mouseReferencePoint->x() - event->globalX();
	const int delta_y = m_mouseReferencePoint->y() - event->globalY();

	const int max_x = m_screenGeometry.width() -  frameGeometry().width() + m_screenGeometry.left();
	const int max_y = m_screenGeometry.height() - frameGeometry().height() + m_screenGeometry.top();

	const int new_x = qBound(m_screenGeometry.left(), m_windowReferencePoint->x() - delta_x, max_x);
	const int new_y = qBound(m_screenGeometry.top(),  m_windowReferencePoint->y() - delta_y, max_y);

	move(new_x, new_y);
}

void DropBox::showToolTip(void)
{
	QToolTip::showText(ui->dropBoxLabel->mapToGlobal(ui->dropBoxLabel->pos()), ui->dropBoxLabel->toolTip());
}

bool DropBox::event(QEvent *event)
{
	switch(event->type())
	{
	case QEvent::Leave:
	case QEvent::WindowDeactivate:
		if(m_moving)
		{
			QApplication::restoreOverrideCursor();
			m_moving = false;
		}
		break;
	}

	return QDialog::event(event);
}

////////////////////////////////////////////////////////////
// PRIVATE
////////////////////////////////////////////////////////////

void DropBox::boundWidget(QWidget *widget)
{
	static const int magnetic = 24;
	QRect availGeometry = QApplication::desktop()->availableGeometry(widget);

	const int max_x = availGeometry.width()  - widget->frameGeometry().width()  + availGeometry.left();
	const int max_y = availGeometry.height() - widget->frameGeometry().height() + availGeometry.top();

	int new_x = qBound(availGeometry.left(), widget->x(), max_x);
	int new_y = qBound(availGeometry.top(),  widget->y(), max_y);

	if(new_x - availGeometry.left() < magnetic) new_x = availGeometry.left();
	if(new_y - availGeometry.top()  < magnetic) new_y = availGeometry.top();

	if(max_x - new_x < magnetic) new_x = max_x;
	if(max_y - new_y < magnetic) new_y = max_y;

	if((widget->x() != new_x) || (widget->y() != new_y))
	{
		widget->move(new_x, new_y);
	}
}