/***************************************************************************
 *   Copyright (C) 2008 by Oliver Groß   *
 *   z.o.gross@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.                                   *
 *                                                                         *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include "ctransfermanager.h"
#include "ctransferthread.h"
#include "csocketmanager.h"
#include "qtransferlistmodel.h"
#include "cworker.h"
#include "cconnectiondialog.h"

#include <QDebug>
#include <QStatusBar>

#include <QFileInfo>
#include <QDataStream>
#include <QTcpServer>
#include <QTcpSocket>

#include <QMenuBar>
#include <QMenu>
#include <QToolBar>
#include <QListView>
#include <QFileDialog>
#include <QApplication>
#include <QMessageBox>

namespace qftrans {
	CTransferManager::CTransferManager(QWidget * parent) : QMainWindow(parent),
		m_ActAsServer(false),
		m_Connected(false),
		m_DestinationDir(QDir::homePath()),
		m_TransferThread(NULL),
		m_SelectedTransfer(NULL)
	{
		setupUi();
	}
	
	// TODO ~CTransferManager()
	CTransferManager::~CTransferManager() {
		cleanupThread();
	}
	
	void CTransferManager::openFile() {
		QStringList files = QFileDialog::getOpenFileNames(this,
			tr("Select one or more files to open"),
			QDir::homePath());
		
		TransferData * newUpload = NULL;
		QFileInfo fileInfo;
		
		foreach (QString i, files) {
			fileInfo.setFile(i);
			newUpload = new TransferData;
			newUpload->fileDir = fileInfo.absolutePath();
			newUpload->fileName = fileInfo.fileName();
			newUpload->size = fileInfo.size();
			newUpload->transfered = 0;
			newUpload->status = TS_WAITING;
			newUpload->lastHeader = HT_ID;
			newUpload->localFile = true;
			
			addTransfer(newUpload);
// 			emit uploadAddRequested(newUpload);
		}
	}
	
	void CTransferManager::setDestinationDir() {
		QString selectedDir = QFileDialog::getExistingDirectory(this, tr("Select a directory to save downloaded files"), m_DestinationDir);
		if (!selectedDir.isEmpty()) {
			m_DestinationDir = selectedDir;
			
			emit destinationDirChanged(m_DestinationDir);
		}
	}
	
	void CTransferManager::requestServerThread() {
		if (!m_ConnectionDialog->execute(true))
			return;
		
		createThread();
		
		m_ActAsServer = true;
		m_TransferThread->start();
	}
	
	void CTransferManager::requestClientThread() {
		if (!m_ConnectionDialog->execute(false))
			return;
		
		createThread();
		
		m_ActAsServer = false;
		m_TransferThread->start();
	}
	
	void CTransferManager::setupConnection() {
		connect(m_TransferThread->socketManager(), SIGNAL(connectionChanged(bool)), this, SLOT(updateConnectionState(bool)));
		
		connect(this, SIGNAL(setupConnectionRequested(bool, quint16, QString &)),
			m_TransferThread->socketManager(), SLOT(setup(bool, quint16, QString &)));
		
		QString host = m_ActAsServer ? "0.0.0.0" :  m_ConnectionDialog->host();
		
		emit setupConnectionRequested(m_ActAsServer, m_ConnectionDialog->port(), host);
	}
	
	void CTransferManager::cleanupThread() {
		if (m_TransferThread) {
			m_TransferThread->quit();
			m_TransferThread->deleteLater();
		}
		m_TransferThread = NULL;
		statusBar()->showMessage(tr("connected"));
	}
	
	void CTransferManager::restartSelected() {
		emit uploadAddRequested(m_SelectedTransfer);
		emit uploadRestartRequested(m_SelectedTransfer);
	}
	
	void CTransferManager::cancelSelected() {
		if (m_SelectedTransfer->localFile)
			emit uploadRemoveRequested(m_SelectedTransfer);
		else
			emit downloadRemoveRequested(m_SelectedTransfer);
	}
	
	inline void CTransferManager::setupUi() {
		setWindowTitle(tr("QFTrans"));
		
		QMenu * currentMenu;
		QToolBar * currentToolBar = addToolBar("Main");
		
		currentMenu = menuBar()->addMenu(tr("&File"));
		m_FileOpen = currentMenu->addAction(tr("&Open..."), this, SLOT(openFile()));
		currentMenu->addAction(tr("Set destination directory..."), this, SLOT(setDestinationDir()));
		
		currentToolBar->addActions(currentMenu->actions());
		
		currentMenu->addSeparator();
		currentMenu->addAction(tr("&Quit"), this, SLOT(close()));
		
		currentToolBar->addSeparator();
		
		currentMenu = menuBar()->addMenu(tr("&Connection"));
		m_ConnectionAsServer = currentMenu->addAction(tr("Act as &server"), this, SLOT(requestServerThread()));
		m_ConnectionAsClient = currentMenu->addAction(tr("Act as &client"), this, SLOT(requestClientThread()));
		currentMenu->addSeparator();
		m_ConnectionDisconnect = currentMenu->addAction(tr("&Disconnect"), this, SLOT(cleanupThread()));
		
		currentToolBar->addActions(currentMenu->actions());
		currentToolBar->addSeparator();
		
		currentMenu = menuBar()->addMenu(tr("&Transfer"));
		m_TransferRestartAction = currentMenu->addAction(tr("(Re)&Start"), this, SLOT(restartSelected()));
		m_TransferCancelAction = currentMenu->addAction(tr("&Cancel"), this, SLOT(cancelSelected()));
		
		m_TransferRestartAction->setEnabled(false);
		m_TransferCancelAction->setEnabled(false);
		
		currentToolBar->addActions(currentMenu->actions());
		
		currentMenu = menuBar()->addMenu(tr("&Help"));
		currentMenu->addAction(tr("&About"), this, SLOT(about()));
		currentMenu->addAction(tr("About &Qt"), qApp, SLOT(aboutQt()));
		
		m_TransferView = new QListView(this);
		setCentralWidget(m_TransferView);
		
		QTransferListModel * listModel = new QTransferListModel(&m_Data);
		
		connect(this, SIGNAL(transferRemoved(TransferData *)), listModel, SIGNAL(layoutChanged()));
		connect(this, SIGNAL(transferAdded(TransferData *)), listModel, SIGNAL(layoutChanged()));
		
		m_TransferView->setModel(listModel);
		
		connect(m_TransferView->selectionModel(), SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),
			this, SLOT(handleSelectionChanged(const QItemSelection &)));
		
		updateConnectionState(false);
		
		m_ConnectionDialog = new CConnectionDialog(this);
		
}
	
	void CTransferManager::updateConnectionState(bool connected) {
		m_Connected = connected;
		if (connected) {
			connectToWorker(m_TransferThread->socketManager()->worker());
			statusBar()->showMessage(tr("connected"));
		}
		else
			statusBar()->showMessage(m_TransferThread ? tr("waiting") : tr("disconnected"));
		
		m_FileOpen->setEnabled(connected);
		m_ConnectionAsServer->setDisabled(connected);
		m_ConnectionAsClient->setDisabled(connected);
		m_ConnectionDisconnect->setEnabled(connected);
	}
	
	// TODO cleanup()
	void CTransferManager::cleanup() {
	}
	
	void CTransferManager::connectToWorker(CWorker * worker) {
		worker->setDestinationDir(m_DestinationDir);
		
		connect(this, SIGNAL(destinationDirChanged(QString &)), worker, SLOT(setDestinationDir(QString &)));
		
		connect(worker, SIGNAL(downloadAdded(TransferData *)), this, SLOT(addTransfer(TransferData *)));
		
		QTransferListModel * model = dynamic_cast<QTransferListModel *>(m_TransferView->model());
		
		connect(worker, SIGNAL(downloadUpdated(TransferData *)), model, SLOT(updateEntry(TransferData *)));
		connect(worker, SIGNAL(uploadUpdated(TransferData *)), model, SLOT(updateEntry(TransferData *)));
		
		connect(this, SIGNAL(uploadAddRequested(TransferData *)), worker, SLOT(addUpload(TransferData *)));
		connect(this, SIGNAL(uploadRestartRequested(TransferData *)), worker, SLOT(startUpload(TransferData *)));
		connect(this, SIGNAL(uploadRemoveRequested(TransferData *)), worker, SLOT(removeUpload(TransferData *)));
		
		connect(this, SIGNAL(downloadRemoveRequested(TransferData *)), worker, SLOT(removeDownload(TransferData *)));
	}
	
	void CTransferManager::handleSelectionChanged(const QItemSelection & selected) {
		QModelIndexList selectedIndexes = selected.indexes();
		if (selectedIndexes.isEmpty())
			m_SelectedTransfer = NULL;
		else
			m_SelectedTransfer = static_cast<TransferData *>(selectedIndexes[0].internalPointer());
		
		m_TransferRestartAction->setEnabled(m_SelectedTransfer && m_SelectedTransfer->localFile);
		m_TransferCancelAction->setEnabled(m_SelectedTransfer && m_SelectedTransfer->status != TS_FINISHED);
	}
	
	void CTransferManager::addTransfer(TransferData * transfer) {
		m_Data << transfer;
		emit transferAdded(transfer);
	}
	
	// TODO proper handle removing transfer
	void CTransferManager::removeTransfer(TransferData * transfer) {
		int index = m_Data.indexOf(transfer);
		if (index != -1) {
			m_Data.removeAt(index);
			
			emit transferRemoved(transfer);
		}
		delete transfer;
	}
	
	inline void CTransferManager::createThread() {
		cleanupThread();
		
		qDebug() << "main thread" << QThread::currentThreadId();
		m_TransferThread = new CTransferThread();
		
		connect(m_TransferThread, SIGNAL(terminated()), this, SLOT(cleanupThread()));
// 		connect(m_TransferThread, SIGNAL(finished()), m_TransferThread, SLOT(deleteLater()));
		
		connect(m_TransferThread, SIGNAL(socketManagerReady()), this, SLOT(setupConnection()));
	}
	
	void CTransferManager::updateStatusBar(const QString & message) {
		if (message.isEmpty()) {
			if (m_Connected)
				statusBar()->showMessage(tr("connected"));
			else
				statusBar()->showMessage(m_TransferThread ? tr("waiting") : tr("disconnected"));
		}
	}
	
	void CTransferManager::about() {
		QMessageBox::about(this, tr("About"), tr("This is a still unfancy \"peer-to-peer\"-like file transfer tool."));
	}
}