/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **********************************************************************/

#include "pendingsimilarartists.h"
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QDomDocument>
#include <util/network/handlenetworkreply.h>
#include "util.h"

namespace LC
{
namespace Lastfmscrobble
{
	PendingSimilarArtists::PendingSimilarArtists (const QString& name,
			int num, QNetworkAccessManager *nam, QObject *parent)
	: BaseSimilarArtists (num, parent)
	, NAM_ (nam)
	{
		QMap<QString, QString> params
		{
			{ "artist", name },
			{ "autocorrect", "1" },
			{ "limit", QString::number (num) }
		};
		Util::HandleReplySeq (Request ("artist.getSimilar", nam, params), this) >>
				Util::Visitor
				{
					[this] (Util::Void) { ReportError ("Unable to query last.fm."); },
					[this] (const QByteArray& data) { HandleData (data); }
				};
	}

	void PendingSimilarArtists::HandleData (const QByteArray& data)
	{
		QDomDocument doc;
		if (!doc.setContent (data))
		{
			ReportError ("Unable to parse last.fm reply.");
			return;
		}

		const auto& artistElems = doc.elementsByTagName ("artist");
		if (artistElems.isEmpty ())
		{
			ReportError ("No results from last.fm.");
			return;
		}

		QList<QPair<QString, double>> similar;
		for (int i = 0, size = artistElems.size (); i < size; ++i)
		{
			const auto& elem = artistElems.at (i).toElement ();
			similar << qMakePair (elem.firstChildElement ("name").text (),
						elem.firstChildElement ("match").text ().toDouble () * 100);
		}

		auto begin = similar.begin ();
		auto end = similar.end ();
		if (const auto distance = end - begin; distance > NumGet_)
			std::advance (begin, distance - NumGet_);

		InfosWaiting_ = std::distance (begin, end);

		for (auto i = begin; i != end; ++i)
		{
			QMap<QString, QString> params { { "artist", i->first } };
			AddLanguageParam (params);
			HandleReply (Request ("artist.getInfo", NAM_, params), i->second, {});
		}
	}
}
}
