/*
	(c) Copyright  2012 - 2018 Anton Sviridenko
	https://picapica.im

	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, version 3.

	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 "filetransferdialog.h"
#include "../contacts.h"
#include "../accounts.h"
#include "../globals.h"
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QMessageBox>
#include <stdlib.h>

FileTransferDialog::FileTransferDialog(QByteArray peer_id, QString filename, quint64 size,
                                       TransferDirection drct, QWidget *parent) :
	peer_id_(peer_id),
	QDialog(parent),
	dir_(drct),
	filename_(filename),
	filesize_(size)
{
	Contacts ct(config_dbname, Accounts::GetCurrentAccount().id);
	peer_name_ = ct.GetContactName(peer_id_);

	if (peer_name_.isEmpty())
		peer_name_ = peer_id_.toBase64();
	else
		peer_name_ = QString("%1 (%2...)").arg(peer_name_).arg(peer_id_.toBase64().left(8).constData());

	QVBoxLayout *layout = new QVBoxLayout(this);
	QHBoxLayout *btlayout = new QHBoxLayout();

	lbFilename = new QLabel(this);
	lbPeer = new QLabel(this);
	lbProgressStatus = new QLabel(this);
	lbTransferSpeed = new QLabel(this);
	lbRemainingTime = new QLabel(this);
	lbTransferStatus = new QLabel(this);

	pgbar = new QProgressBar(this);
	leftbutton = new QPushButton(this);
	rightbutton = new QPushButton(this);

	layout->addWidget(lbFilename);
	layout->addWidget(lbPeer);
	layout->addWidget(lbProgressStatus);
	layout->addWidget(lbTransferSpeed);
	layout->addWidget(lbRemainingTime);
	layout->addWidget(pgbar);
	layout->addWidget(lbTransferStatus);
	layout->addLayout(btlayout);

	btlayout->addWidget(leftbutton);
	btlayout->addWidget(rightbutton);

	if (drct == RECEIVING)
	{
		leftbutton->setText(tr("Accept"));
		rightbutton->setText(tr("Deny"));

		lbPeer->setText("Sender: " + peer_name_);

		setWindowTitle(tr("Receiving file %1 from %2").arg(filename_).arg(peer_name_));
	}
	else if (drct == SENDING)
	{
		leftbutton->setText(tr("Pause"));
		rightbutton->setText(tr("Cancel"));
		leftbutton->setEnabled(false);

		lbPeer->setText("Receiver: " + peer_name_);

		setWindowTitle(tr("Sending file %1 to %2").arg(filename_).arg(peer_name_));
	}
	setTransferStatus(WAITINGFORACCEPT);

	lbFilename->setText(filename_);

	pgbar->setMinimum(0);
	pgbar->setMaximum(100);

	update(0);

	timer = new QTimer(this);
	connect(timer, SIGNAL(timeout()), this, SLOT(timeout()));
	timer->start(1000);
	progress_ = 0;
	prevprogress_ = 0;

	connect(leftbutton, SIGNAL(clicked()), this, SLOT(leftbuttonclick()));
	connect(rightbutton, SIGNAL(clicked()), this, SLOT(rightbuttonclick()));
}

void FileTransferDialog::update(quint64 progress)
{
	progress_ = progress;
	percents = (double)progress / filesize_ * 100.0;

	lbProgressStatus->setText(bytestoHumanBase2(progress) + " / "
	                          + bytestoHumanBase2(filesize_) + QString(" %1 %").arg((int)percents));

	pgbar->setValue(percents);

	if (progress == filesize_)
	{
		setTransferStatus(FINISHED);
	}
}

void FileTransferDialog::setTransferStatus(TransferStatus st)
{
	bool isTerminalState = false;

	switch(st)
	{
	case WAITINGFORACCEPT:
		if (dir_ == SENDING)
			lbTransferStatus->setText(tr("Waiting for peer to accept the file"));
		else
			lbTransferStatus->setText(tr("Waiting for acceptance"));
		break;

	case DENIED:
		lbTransferStatus->setText(tr("Denied by peer"));
		isTerminalState = true;
		break;

	case SENDINGFILE:
		leftbutton->setEnabled(true);
		lbTransferStatus->setText(tr("Sending file"));
		break;

	case RECEIVINGFILE:
		lbTransferStatus->setText(tr("Receiving file"));
		break;

	case PAUSED:
		lbTransferStatus->setText(tr("Paused"));
		break;

	case CANCELLED:
		lbTransferStatus->setText(tr("Cancelled"));
		isTerminalState = true;
		break;

	case FINISHED:
		lbTransferStatus->setText(tr("Finished"));
		isTerminalState = true;
		break;

	case PEERDISCONNECTED:
		lbTransferStatus->setText(tr("Peer disconnected"));
		isTerminalState = true;
		break;

	case IOERROR:
		lbTransferStatus->setText(tr("I/O error"));
		isTerminalState = true;
		break;
	}

	if (isTerminalState)
	{
		leftbutton->setEnabled(false);
		rightbutton->setEnabled(false);

		QWidget::setAttribute(Qt::WA_DeleteOnClose);
		QWidget::setAttribute(Qt::WA_QuitOnClose, false);
	}
}

void FileTransferDialog::pausedByPeer()
{
	leftbutton->setEnabled(false);
	setTransferStatus(PAUSED);
}

void FileTransferDialog::resumedByPeer()
{
	leftbutton->setEnabled(true);
	setTransferStatus( dir_ == SENDING ? SENDINGFILE : RECEIVINGFILE);
}

void FileTransferDialog::cancelledByPeer()
{
	setTransferStatus(CANCELLED);
}

void FileTransferDialog::ioError()
{
	setTransferStatus(IOERROR);
}

void FileTransferDialog::peerDisconnected()
{
	setTransferStatus(PEERDISCONNECTED);
}

void FileTransferDialog::leftbuttonclick()
{
	if (dir_ == RECEIVING)
	{
		if (leftbutton->text() == tr("Accept"))
		{
			leftbutton->setText("Pause");
			rightbutton->setText("Cancel");
			emit acceptedFile(peer_id_);
			return;
		}
	}

	if (leftbutton->text() == tr("Pause"))
	{
		leftbutton->setText(tr("Resume"));
		emit pausedFile(peer_id_, this);
		setTransferStatus(PAUSED);
	}
	else if (leftbutton->text() == tr("Resume"))
	{
		leftbutton->setText(tr("Pause"));
		emit resumedFile(peer_id_, this);
		setTransferStatus(dir_ == SENDING ? SENDINGFILE : RECEIVINGFILE);
	}
}

void FileTransferDialog::rightbuttonclick()
{
	if (dir_ == RECEIVING)
	{
		if (rightbutton->text() == tr("Deny"))
		{
			emit deniedFile(peer_id_);
			setTransferStatus(DENIED);
			return;
		}
	}

	if (rightbutton->text() == tr("Cancel"))
	{

		if (QMessageBox::No == QMessageBox::question(this, tr("Cancel File Transfer"),
		        tr("Are you sure you want to cancel file transfer?"),
		        QMessageBox::Yes | QMessageBox::No, QMessageBox::No))
			return;

		emit cancelledFile(peer_id_, this);
		setTransferStatus(CANCELLED);
	}
}

QString FileTransferDialog::bytestoHumanBase2(quint64 bytes)
{
	const char* units[] = {"B", "KiB", "MiB", "GiB", "TiB", "PiB"};
	int i = 0;
	double size = bytes;

	while (size > 1024)
	{
		size /= 1024;
		i++;
	}

	return QString("%1 %2").arg(size, 6, 'f', i ? 2 : 0).arg(units[i]);
}

QString FileTransferDialog::bytestoHumanBase10(quint64 bytes)
{
	const char* units[] = {"B", "kB", "MB", "GB", "TB", "PB"};
	int i = 0;
	double size = bytes;

	while (size > 1000)
	{
		size /= 1000;
		i++;
	}

	return QString("%1 %2").arg(size, 6, 'f', i ? 2 : 0).arg(units[i]);
}

QString FileTransferDialog::timeLeft(quint64 seconds)
{
	if (seconds < 60)
	{
		return QString(tr("%1 seconds")).arg(seconds);
	}

	int minutes = seconds / 60;
	int hours = minutes / 60;
	double days = (double)hours / 24.0;

	if (days > 1.0 )
		return QString(tr("%1 days")).arg(days, 6, 'f', 1);

	if (hours > 0)
		return QString("%1h:%2m").arg(hours).arg(minutes % 60);

	return QString("%1:%2").arg(minutes).arg((double)(seconds % 60), 2, 'f', 0, '0');
}

void FileTransferDialog::timeout()
{
	if (progress_ >= filesize_)
		return;

	quint64 bps = progress_ - prevprogress_;
	prevprogress_ = progress_;

	if (bps != 0)
	{
		quint64 secondsleft = (filesize_ - progress_) / bps;

		lbRemainingTime->setText(timeLeft(secondsleft));
	}
	else
		lbRemainingTime->setText(QString());

	lbTransferSpeed->setText(bytestoHumanBase10(bps) + tr("/s"));
}