/**

 * Copyright (c) 2010 Sasken Communication Technologies Ltd.

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the "Eclipse Public License v1.0"

 * which accompanies  this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html"

 *

 * Initial Contributors:

 * Chandradeep Gandhi, Sasken Communication Technologies Ltd - Initial contribution

 *

 * Contributors:

 * Sangeeta Prasad, Nalina Hariharan

 *

 * Description:

 * The Plugin that does music services related functionalities from last.fm site

 *

 */

// Include files

#include <QtPlugin>

#include <QDebug>

#include <QCryptographicHash>

#include <QTextStream>

#include <QFile>

#include <QMap>

#include <QListIterator>

#include <QSettings>

#include <smfpluginutil.h>

#include "lastfmplaylistserviceplugin.h"

static int gPageNum = 0; 

static int gItemsPerPage = 0;

//Payload data array

QByteArray payload;

/**

 * Destructor

 */

LastFmPlaylistServicePlugin::~LastFmPlaylistServicePlugin( )

	{

	if(m_provider)

		delete m_provider;

	}

/**

 * Method to interpret the key sets obtained from credential manager 

 * @param aApiKey [out] The api key

 * @param aApiSecret [out] The api secret

 * @param aSessionKey [out] The session key

 * @param aToken [out] The session token

 * @param aName [out] The user name

 */

void LastFmPlaylistServicePlugin::fetchKeys( QString &aApiKey, 

		QString &aApiSecret, 

		QString &aToken,

		QString &aName )

	{

	qDebug()<<"Reg Token = "<<m_provider->m_smfRegToken;

	qDebug()<<"Expiry Date as int = "<<m_provider->m_validity.toTime_t();

	SmfAuthParams keys;

	SmfPluginUtil util;

	util.getAuthKeys(keys, m_provider->m_smfRegToken, 

			m_provider->m_validity, m_provider->m_pluginId);

    QByteArray keyName;

    keyName.append("ApiKey");

	aApiKey.append(keys.value(keyName));

    keyName.clear();

    keyName.append("ApiSecret");

	aApiSecret.append(keys.value(keyName));

	keyName.clear();

    keyName.append("Token");

	aToken.append(keys.value(keyName));

	keyName.clear();

    keyName.append("Name");

	aName.append(keys.value(keyName));

	qDebug()<<"Api Key = "<<aApiKey;

	qDebug()<<"Api Secret = "<<aApiSecret;

	qDebug()<<"Token = "<<aToken;

	qDebug()<<"Name = "<<aName;

	}

/**

 * Method called by plugins to generate a signature string from a base string

 * @param aBaseString The base string

 * @return The md5 hash of the base string

 */

QString LastFmPlaylistServicePlugin::generateSignature(const QString aBaseString)

	{

	// Create md5 hash of the signature string

    QByteArray byteArray;

    byteArray.insert(0, aBaseString.toAscii());

    QByteArray md5Hash = QCryptographicHash::hash(byteArray,QCryptographicHash::Md5 ).toHex();

    QString returnString (md5Hash);

    return returnString;

	}

/**

 * Method to get the playlist

 * @param aRequest [out] The request data to be sent to network

 * @param aPageNum [in] The page to be extracted

 * @param aItemsPerPage [in] Number of items per page

 * @return Appropriate value of the enum SmfPluginError.

 * Plugin error if any, else SmfPluginErrNone for success

 */

SmfPluginError LastFmPlaylistServicePlugin::playlists( 

		SmfPluginRequestData &aRequest,

		const int aPageNum,

		const int aItemsPerPage )

	{

	qDebug()<<"Inside LastFmPlaylistServicePlugin::playlists()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

	if( aPageNum < 0 || aItemsPerPage < 0 )

		{

		qDebug()<<"Invalid arguments";

		return error;

		}

	qDebug()<<"Valid arguments";

	gPageNum = aPageNum;

	gItemsPerPage = aItemsPerPage;

	// Get the key sets from SMF Plugin Utility class.

	QString apiKey;

	QString apiSecret;

	QString token;

	QString userName;

	fetchKeys(apiKey, apiSecret, token, userName);

	// Create the API signature string

	QString baseString;

	baseString.append("api_key"+apiKey);

	baseString.append("methoduser.getPlaylists");

	baseString.append("user"+userName);

	baseString.append(apiSecret);

	// Create the url

	QUrl url("http://ws.audioscrobbler.com/2.0/?");

	url.addQueryItem("api_key", apiKey);

	url.addQueryItem("format", "json");

	url.addQueryItem("method", "user.getPlaylists");

	url.addQueryItem("user", userName);

	url.addQueryItem("api_sig", generateSignature(baseString));

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iRequestType = SmfMusicGetPlaylists;

	aRequest.iPostData = NULL;

	aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

	error = SmfPluginErrNone;

	qDebug()<<"Url string is : "<<aRequest.iNetworkRequest.url().toString();

	return error;

	}

/**

 * Method to get the playlist of a particular user

 * @param aRequest [out] The request data to be sent to network

 * @param aUser [in] The user whose playlists need to be fetched

 * @param aPageNum [in] The page to be extracted

 * @param aItemsPerPage [in] Number of items per page

 * @return Appropriate value of the enum SmfPluginError.

 * Plugin error if any, else SmfPluginErrNone for success

 */

SmfPluginError LastFmPlaylistServicePlugin::playlistsOf( 

		SmfPluginRequestData &aRequest,

		const SmfContact &aUser,

		const int aPageNum, 

		const int aItemsPerPage )

	{

	qDebug()<<"Inside LastFmPlaylistServicePlugin::playlistsOf()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

	if( aPageNum < 0 || aItemsPerPage < 0 || 

			aUser.value("Name").value<QContactName>().firstName().isEmpty() )

		{

		qDebug()<<"Invalid arguments";

		return error;

		}

	qDebug()<<"Valid arguments";

	gPageNum = aPageNum;

	gItemsPerPage = aItemsPerPage;

	// Get the key sets from SMF Plugin Utility class.

	QString apiKey;

	QString apiSecret;

	QString token;

	QString userName;

	fetchKeys(apiKey, apiSecret, token, userName);

	userName.clear();

	userName = aUser.value("Name").value<QContactName>().firstName();

	// Create the API signature string

	QString baseString;

	baseString.append("api_key"+apiKey);

	baseString.append("methoduser.getPlaylists");

	baseString.append("user"+userName);

	baseString.append(apiSecret);

	// Create the url

	QUrl url("http://ws.audioscrobbler.com/2.0/?");

	url.addQueryItem("api_key", apiKey);

	url.addQueryItem("format", "json");

	url.addQueryItem("method", "user.getPlaylists");

	url.addQueryItem("user", userName);

	url.addQueryItem("api_sig", generateSignature(baseString));

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iRequestType = SmfMusicGetPlaylistsOfUser;

	aRequest.iPostData = NULL;

	aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

	error = SmfPluginErrNone;

	qDebug()<<"Url string is : "<<aRequest.iNetworkRequest.url().toString();

	return error;

	}

/**

 * Method to add tracks to a playlist

 * @param aRequest [out] The request data to be sent to network

 * @param aPlaylist [in] The playlist where tracks should be added

 * @param aTracks [in] The tracks to be added to the playlist

 * @return Appropriate value of the enum SmfPluginError.

 * Plugin error if any, else SmfPluginErrNone for success

 */

SmfPluginError LastFmPlaylistServicePlugin::addToPlaylist( 

		SmfPluginRequestData &aRequest,

		const SmfPlaylist &aPlaylist, 

		const QList<SmfTrackInfo> &aTracks )

	{

	qDebug()<<"Inside LastFmPlaylistServicePlugin::addToPlaylist()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

	if( aPlaylist.id().isEmpty() || (0 == aTracks.count()) )

		{

		qDebug()<<"Invalid arguments";

		return error;

		}

	else if(aTracks.at(0).title().isEmpty() || aTracks.at(0).artists().names().at(0).isEmpty())

		{

		qDebug()<<"Invalid arguments";

		return error;

		}

	else

		qDebug()<<"Valid arguments";

	// Get the key sets from SMF Plugin Utility class.

	QString apiKey;

	QString apiSecret;

	QString token;

	QString userName;

	fetchKeys(apiKey, apiSecret, token, userName);

	// Create the API signature string

	QString baseString;

	baseString.append("api_key"+apiKey);

	baseString.append("artist"+aTracks.at(0).artists().names().at(0));

	baseString.append("methodplaylist.addTrack");

	baseString.append("playlistID"+aPlaylist.id());

	baseString.append("sk"+token);

	baseString.append("track"+aTracks.at(0).title());

	baseString.append(apiSecret);

	QUrl postData;

	postData.addQueryItem("api_key", apiKey);

	postData.addQueryItem("artist", aTracks.at(0).artists().names().at(0));

	postData.addQueryItem("format","json");

	postData.addQueryItem("method", "playlist.addTrack");

	postData.addQueryItem("playlistID",aPlaylist.id());

	postData.addQueryItem("sk",token);

	postData.addQueryItem("track",aTracks.at(0).title());

	postData.addQueryItem("api_sig", generateSignature(baseString));

	QString data(postData.toString());

	data.remove(0, 1); // Remove the first ?

	payload.clear();

	payload.append(data.toAscii());

	qDebug()<<"Data = "<<QString(payload);

	// Create the url

	QUrl url("http://ws.audioscrobbler.com/2.0/");

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iNetworkRequest.setRawHeader("Content-Type", "application/x-www-form-urlencoded");

	aRequest.iRequestType = SmfMusicAddToPlaylist;

	aRequest.iPostData = new QBuffer(&payload);

	aRequest.iHttpOperationType = QNetworkAccessManager::PostOperation;

	error = SmfPluginErrNone;

	qDebug()<<"Url string is : "<<aRequest.iNetworkRequest.url().toString();

	return error;

	}

/**

 * Method to post the current playing playlist

 * @param aRequest [out] The request data to be sent to network

 * @param aPlaylist [in] The current playing playlist which should be posted

 * @return Appropriate value of the enum SmfPluginError.

 * Plugin error if any, else SmfPluginErrNone for success

 */

SmfPluginError LastFmPlaylistServicePlugin::postCurrentPlayingPlaylist(

		SmfPluginRequestData &aRequest, 

		const SmfPlaylist &aPlaylist )

	{

	qDebug()<<"Inside LastFmPlaylistServicePlugin::postCurrentPlayingPlaylist()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

/*	if( aPlaylist.playListTitle().isEmpty() )

		{

		qDebug()<<"Invalid arguments";

		return error;

		}*/

	qDebug()<<"Valid arguments";

	// Get the key sets from SMF Plugin Utility class.

	QString apiKey;

	QString apiSecret;

	QString token;

	QString userName;

	fetchKeys(apiKey, apiSecret, token, userName);

	// Create the API signature string

	QString baseString;

	baseString.append("api_key"+apiKey);

	baseString.append("methodplaylist.create");

	baseString.append("sk"+token);

	if( !aPlaylist.playListTitle().isEmpty()) //you can create a playlist without name also

		baseString.append("title"+aPlaylist.playListTitle());

	baseString.append(apiSecret);

	QUrl postData;

	postData.addQueryItem("api_key", apiKey);

	postData.addQueryItem("format","json");

	postData.addQueryItem("method", "playlist.create");

	postData.addQueryItem("sk",token);

	if( !aPlaylist.playListTitle().isEmpty())

		postData.addQueryItem("title",aPlaylist.playListTitle());

	postData.addQueryItem("api_sig", generateSignature(baseString));

	QString data(postData.toString());

	data.remove(0, 1);

	payload.clear();

	payload.append(data.toAscii());

	qDebug()<<"Data = "<<QString(payload);

	// Create the url

	QUrl url("http://ws.audioscrobbler.com/2.0/");

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iNetworkRequest.setRawHeader("Content-Type", "application/x-www-form-urlencoded");

	aRequest.iRequestType = SmfMusicPostCurrentPlayingPlaylist;

	aRequest.iPostData = new QBuffer(&payload);

	aRequest.iHttpOperationType = QNetworkAccessManager::PostOperation;

	error = SmfPluginErrNone;

	qDebug()<<"Url string is : "<<aRequest.iNetworkRequest.url().toString();

	return error;

	}

/**

 * Customised method for SmfPlaylistServicePlugin interface

 * @param aRequest [out] The request data to be sent to network

 * @param aOperation [in] The operation type (should be known between 

 * the client interface and the plugin)

 * @param aData [in] The data required to form the request (The type 

 * of data should be known between client and the plugin)

 * @return Appropriate value of the enum SmfPluginError.

 * Plugin error if any, else SmfPluginErrNone for success

 */

SmfPluginError LastFmPlaylistServicePlugin::customRequest( SmfPluginRequestData &aRequest, 

		const int &aOperation, QByteArray *aData )

	{

	Q_UNUSED(aRequest)

	Q_UNUSED(aOperation)

	Q_UNUSED(aData)

	qDebug()<<"Inside LastFmPlaylistServicePlugin::customRequest()";

	SmfPluginError error = SmfPluginErrInvalidRequest;

	return error;

	}

/**

 * The first method to be called in the plugin that implements this interface.

 * If this method is not called, plugin may not behave as expected.

 */

void LastFmPlaylistServicePlugin::initialize( )

	{

	// Create an instance of LastFmMusicServiceProviderBase

	m_provider = new LastFmPlaylistServiceProviderBase;

	m_provider->initialize();

	}

/**

 * Method to get the provider information

 * @return Instance of SmfProviderBase

 */

SmfProviderBase* LastFmPlaylistServicePlugin::getProviderInfo( )

	{

	return m_provider;

	}

/**

 * Method to get the result for a network request.

 * @param aOperation The type of operation to be requested

 * @param aTransportResult The result of transport operation

 * @param aResponse The QByteArray instance containing the network response.

 * The plugins should delete this instance once they have read the

 * data from it.

 * @param aResult [out] An output parameter to the plugin manager.If the

 * return value is SmfSendRequestAgain, QVariant will be of type

 * SmfPluginRequestData.

 * For SmfMusicServicePlugin: If last operation was userMusicInfo(), aResult 

 * will be of type SmfMusicProfile. If last operation was searchArtist(), 

 * aResult will be of type QList<SmfArtists>. If last operation was searchAlbum(), 

 * aResult will be of type QList<SmfAlbum>. If last operation was searchEvents(), 

 * aResult will be of type QList<SmfEvent>. If last operation was searchVenue(), 

 * aResult will be of type QList<Smfocation>. If last operation was searchUser(), 

 * aResult will be of type QList<SmfMusicProfile>. If last operation was 

 * postCurrentPlaying() or postRating() or postComments(), aResult will be of 

 * type bool.

 * @param aRetType [out] SmfPluginRetType

 * @param aPageResult [out] The SmfResultPage structure variable

 */

SmfPluginError LastFmPlaylistServicePlugin::responseAvailable(

		const SmfRequestTypeID aOperation,

		const SmfTransportResult &aTransportResult,

		QByteArray *aResponse,

		QVariant* aResult,

		SmfPluginRetType &aRetType,

		SmfResultPage &aPageResult )

	{

	Q_UNUSED(aPageResult)

	qDebug()<<"Inside LastFmPlaylistServicePlugin::responseAvailable()";

	SmfPluginError error = SmfPluginErrNetworkError;

	if( !aResponse || (0 == aResponse->size()) )

		{

		qDebug()<<"Response is NULL or empty";

		aRetType = SmfRequestError;

		return error;

		}

	QByteArray response(*aResponse);

	delete aResponse;

	QFile respFile("c://data//SmfMusicPlaylistPluginResponse.txt");

	if(!respFile.open(QIODevice::WriteOnly))

		qDebug()<<"File to write the response could not be opened";

	else

		{

		respFile.write(response);

		respFile.close();

		qDebug()<<"Writing FB response to a file named 'SmfMusicPlaylistPluginResponse.txt'";

		}

	qDebug()<<"FB response size = "<<response.size();

	if(SmfTransportOpNoError == aTransportResult)

		{

		qDebug()<<"No transport error";

		// Get user's playlists

		if(SmfMusicGetPlaylists == aOperation)

			{

			qDebug()<<"Response for getting user's playlist";

			QList<SmfPlaylist> list;				

			QString errStr;

			errStr.clear();

			bool ok;

			SmfPluginUtil util;

			QVariantMap result = util.parse(response, &ok).toMap();

			if (!ok) 

				{

				qDebug()<<"An error occurred during json parsing";

				aRetType = SmfRequestError;

				return SmfPluginErrParsingFailed;

				}

			qDebug()<<"Json parsing complete";

			if(response.contains(QByteArray("error")))

				{

				errStr.append(result["message"].toString());

				}

			else

				{

				QVariantMap map1 = result["playlists"].toMap();

				QList<QVariant> list1 = map1["playlist"].toList();

				QListIterator<QVariant> iter1(list1);

				bool ifList = false;

				while(iter1.hasNext())

					{

					ifList = true;

					QVariantMap map2 = iter1.next().toMap();

					SmfPlaylist playlist;