/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2011  Georg Rudoy
 *
 * 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 <http://www.gnu.org/licenses/>.
 **********************************************************************/

#include "favoriteschecker.h"
#include <QProgressDialog>
#include <QMessageBox>
#include <QApplication>
#include <QFontMetrics>
#include <QMainWindow>
#include "core.h"

namespace LeechCraft
{
namespace Poshuku
{
	FavoritesChecker::FavoritesChecker (QObject *parent)
	: QObject (parent)
	, Model_ (Core::Instance ().GetFavoritesModel ())
	{
		ProgressDialog_ = new QProgressDialog (tr ("Checking Favorites..."),
				tr ("Cancel"),
				0, 0);
		connect (ProgressDialog_,
				SIGNAL (canceled ()),
				this,
				SLOT (handleCanceled ()));
	}

	void FavoritesChecker::Check ()
	{
		if (Pending_.size ())
		{
			QMessageBox::critical (Core::Instance ().GetProxy ()->GetMainWindow (),
					"LeechCraft",
					tr ("Already checking links, please wait..."));
			return;
		}

		Pending_.clear ();
		Results_.clear ();

		Items_ = Model_->GetItems ();

		Q_FOREACH (FavoritesModel::FavoritesItem item, Items_)
		{
			QUrl url = QUrl (item.URL_);
			QNetworkRequest req (url);
			QString ua = Core::Instance ().GetUserAgent (url);
			if (!ua.isEmpty ())
				req.setRawHeader ("User-Agent", ua.toLatin1 ());

			QNetworkReply *rep = Core::Instance ()
				.GetNetworkAccessManager ()->head (req);

			rep->setProperty ("SourceURL", url);

			connect (rep,
					SIGNAL (finished ()),
					this,
					SLOT (handleFinished ()));

			Pending_ << rep;
		}

		if (Pending_.size ())
		{
			ProgressDialog_->setRange (0, Pending_.size ());
			ProgressDialog_->setValue (0);
			ProgressDialog_->show ();
		}
	}

	namespace
	{
		QString BuildMessage (const QStringList& list, const QString& property, int num)
		{
			QString result;
			if (!list.size ())
				result = "";
			else if (list.size () < num)
			{
				QString merged;
				Q_FOREACH (QString url, list)
					merged.append (QString ("<li>%1</li>")
							.arg (QApplication::fontMetrics ()
									.elidedText (url, Qt::ElideMiddle, 400)));
				result = FavoritesChecker::tr ("%1 favorites are %2:<br /><ul>%3</ul>")
					.arg (list.size ())
					.arg (property)
					.arg (merged);
			}
			else
				result = FavoritesChecker::tr ("%1 favorites are %2.<br />")
					.arg (list.size ())
					.arg (property);

			return result;
		}
	}

	void FavoritesChecker::handleFinished ()
	{
		QNetworkReply *rep = qobject_cast<QNetworkReply*> (sender ());
		if (!rep)
		{
			qWarning () << Q_FUNC_INFO
				<< "sender is not a QNetworkReply*"
				<< sender ();
			return;
		}

		Pending_.removeAll (rep);
		rep->deleteLater ();

		QUrl url = rep->property ("SourceURL").value<QUrl> ();
		Result result =
		{
			rep->error (),
			rep->errorString (),
			rep->attribute (QNetworkRequest::HttpStatusCodeAttribute).toInt (),
			rep->attribute (QNetworkRequest::RedirectionTargetAttribute).value<QUrl> (),
			rep->header (QNetworkRequest::LastModifiedHeader).toDateTime (),
			rep->header (QNetworkRequest::ContentLengthHeader).value<qint64> ()
		};

		Results_ [url] = result;

		ProgressDialog_->setValue (ProgressDialog_->value () + 1);

		if (!Pending_.size ())
		{
			ProgressDialog_->setValue (ProgressDialog_->value () + 1);

			int accessible = 0,
				serverStuff = 0;
			QStringList unaccessibleList;
			QStringList redirectsList;

			QMap<QString, QString> result;

			Q_FOREACH (QUrl key, Results_.keys ())
			{
				QString mres;
				Result res = Results_ [key];
				if (res.Error_ != QNetworkReply::NoError)
				{
					unaccessibleList << key.toString ();
					mres = res.ErrorString_;
				}
				else if (res.StatusCode_ < 200 ||
						res.StatusCode_ > 399)
				{
					++serverStuff;
					mres = QString ("HTTP %1")
						.arg (res.StatusCode_);
				}
				else
				{
					++accessible;
					mres = tr ("HTTP %1")
						.arg (res.StatusCode_);
					if (res.Length_)
						mres += tr ("<br />Length: %1")
							.arg (res.Length_);
					if (res.LastModified_.isValid ())
						mres += tr ("<br />Last-modified: %1")
							.arg (res.LastModified_.toString ());

					if (res.RedirectURL_.isValid ())
					{
						redirectsList << key.toString ();
						mres += tr ("<br />Redirects to %1")
							.arg (res.RedirectURL_.toString ());
					}
				}

				result [key.toString ()] = mres;
			}

			Model_->SetCheckResults (result);

			QString message = tr ("%1 favorites total.<br />"
					"%2 favorites are accessible.<br />"
					"%3"
					"%4 are not correctly returned by the remote server.<br />"
					"%5")
				.arg (accessible + unaccessibleList.size () + serverStuff)
				.arg (accessible)
				.arg (BuildMessage (unaccessibleList, "unaccessible", 10))
				.arg (serverStuff)
				.arg (BuildMessage (redirectsList, "redirected", 10));

			QMessageBox::information (Core::Instance ().GetProxy ()->GetMainWindow (),
					"LeechCraft",
					message);

			ProgressDialog_->reset ();
		}
	}

	void FavoritesChecker::handleCanceled ()
	{
		Q_FOREACH (QNetworkReply *rep, Pending_)
			delete rep;

		Pending_.clear ();
		Results_.clear ();
		Items_.clear ();
	}
}
}
