/**

 * 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:

 * 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 <smfcontact.h>

#include "lastfmmusicserviceplugin.h"

static int gPageNum = 0; 

static int gItemsPerPage = 0;

QString gUserId;

static int userMusicInfoChance = 0;

QList<SmfTrackInfo> gRecentTracks;

QList<SmfTrackInfo> gFavorites;

QList<SmfEvent> gUserEvents;

/**

 * Destructor

 */

LastFmMusicServicePlugin::~LastFmMusicServicePlugin( )

	{

	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

 */

void LastFmMusicServicePlugin::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 LastFmMusicServicePlugin::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 self profile information

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

 * @return Appropriate value of the enum SmfPluginError.

 * Plugin error if any, else SmfPluginErrNone for success

 */

SmfPluginError LastFmMusicServicePlugin::userMusicInfo( 

		SmfPluginRequestData &aRequest )

	{

	qDebug()<<"Inside LastFmMusicServicePlugin::userMusicInfo()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

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

	QString apiKey;

	QString apiSecret;

	QString token;

	QString userName;

	fetchKeys(apiKey, apiSecret, token, userName);

	// Get the current logged in user id

	if(0 == userMusicInfoChance)

		{

		// Clear the global variables

		gUserId.clear();

		gRecentTracks.clear();

		gFavorites.clear();

		gUserEvents.clear();

		gPageNum = 1;

		gItemsPerPage = 5;

		// Create the API signature string

		QString baseString;

		baseString.append("api_key"+apiKey);

		baseString.append("methoduser.getInfo");

		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.getInfo");

		url.addQueryItem("user", userName);

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

		// Create the request, set the url

		aRequest.iNetworkRequest.setUrl(url);

		aRequest.iRequestType = SmfMusicGetUserInfo;

		aRequest.iPostData = NULL;

		aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

		error = SmfPluginErrNone;

		}

	// Getting the user's recent tracks

	else if(1 == userMusicInfoChance)

		{

		// Create the API signature string

		QString baseString;

		baseString.append("api_key"+apiKey);

		baseString.append("limit"+QString::number(gItemsPerPage));

		baseString.append("methoduser.getRecentTracks");

		baseString.append("page"+QString::number(gPageNum));

		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("limit", QString::number(gItemsPerPage));		

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

		url.addQueryItem("page", QString::number(gPageNum));

		url.addQueryItem("user", userName);

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

		// Create the request, set the url

		aRequest.iNetworkRequest.setUrl(url);

		aRequest.iRequestType = SmfMusicGetUserInfo;

		aRequest.iPostData = NULL;

		aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

		error = SmfPluginErrNone;

		}

	// Getting the user's favorites

	else if(2 == userMusicInfoChance)

		{

		// Create the API signature string

		QString baseString;

		baseString.append("api_key"+apiKey);

		baseString.append("limit"+QString::number(gItemsPerPage));

		baseString.append("methoduser.getLovedTracks");

		baseString.append("page"+QString::number(gPageNum));

		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("limit", QString::number(gItemsPerPage));		

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

		url.addQueryItem("page", QString::number(gPageNum));

		url.addQueryItem("user", userName);

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

		// Create the request, set the url

		aRequest.iNetworkRequest.setUrl(url);

		aRequest.iRequestType = SmfMusicGetUserInfo;

		aRequest.iPostData = NULL;

		aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

		error = SmfPluginErrNone;

		}

	// Get the user's events

	else //if(3 == userMusicInfoChance)

		{

		// Create the API signature string

		QString baseString;

		baseString.append("api_key"+apiKey);

		baseString.append("methoduser.getEvents");

		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.getEvents");

		url.addQueryItem("user", userName);

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

		// Create the request, set the url

		aRequest.iNetworkRequest.setUrl(url);

		aRequest.iRequestType = SmfMusicGetUserInfo;

		aRequest.iPostData = NULL;

		aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

		error = SmfPluginErrNone;

		}

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

	return error;

	}

/**

 * Method to search information about artists. All information 

 * in SmfArtists is not required, however more available the better

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

 * @param aArtist The artist which is the search criteria

 * @param aPageNum The page to be extracted

 * @param aItemsPerPage Number of items per page

 * @return Appropriate value of the enum SmfPluginError.

 * Plugin error if any, else SmfPluginErrNone for success

 */

SmfPluginError LastFmMusicServicePlugin::searchArtist( 

		SmfPluginRequestData &aRequest,

		const SmfArtists &aArtist,

		const int aPageNum , 

		const int aItemsPerPage )

	{

	qDebug()<<"Inside LastFmMusicServicePlugin::searchArtist()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

	if( aPageNum < 0 || aItemsPerPage < 0 || aArtist.names().at(0).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);

	// Create the API signature string

	QString baseString;

	baseString.append("api_key"+apiKey);

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

	baseString.append("limit"+QString::number(aItemsPerPage));

	baseString.append("methodartist.search");

	baseString.append("page"+QString::number(aPageNum));

	baseString.append(apiSecret);

	// Create the url

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

	url.addQueryItem("api_key", apiKey);

	url.addQueryItem("artist", aArtist.names().at(0));

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

	url.addQueryItem("limit", QString::number(aItemsPerPage));

	url.addQueryItem("page", QString::number(aPageNum));

	url.addQueryItem("method", "artist.search");

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

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iRequestType = SmfMusicSearchArtist;

	aRequest.iPostData = NULL;

	aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

	error = SmfPluginErrNone;

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

	return error;

	}

/**

 * Method to search information about album. All information 

 * in SmfAlbum is not required, however more available the better

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

 * @param aAlbum [in] The album which is the search criteria

 * @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 LastFmMusicServicePlugin::searchAlbum( 

		SmfPluginRequestData &aRequest,

		const SmfAlbum &aAlbum,

		const int aPageNum, 

		const int aItemsPerPage )

	{

	qDebug()<<"Inside LastFmMusicServicePlugin::searchAlbum()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

	if( aPageNum < 0 || aItemsPerPage < 0 || aAlbum.name().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);

	// Create the API signature string

	QString baseString;

	baseString.append("album"+aAlbum.name());

	baseString.append("api_key"+apiKey);

	baseString.append("limit"+QString::number(aItemsPerPage));

	baseString.append("methodalbum.search");

	baseString.append("page"+QString::number(aPageNum));

	baseString.append(apiSecret);

	// Create the url

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

	url.addQueryItem("album", aAlbum.name());

	url.addQueryItem("api_key", apiKey);

	url.addQueryItem("limit", QString::number(aItemsPerPage));

	url.addQueryItem("page", QString::number(aPageNum));

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

	url.addQueryItem("method", "album.search");

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

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iRequestType = SmfMusicSearchAlbum;

	aRequest.iPostData = NULL;

	aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

	error = SmfPluginErrNone;

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

	return error;

	}

/**

 * Method to search information about events. All information 

 * in SmfEvent is not required, however more available the better

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

 * @param aEvent [in] The event which is the search criteria

 * @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 LastFmMusicServicePlugin::searchEvents( 

		SmfPluginRequestData &aRequest,

		const SmfEvent &aEvent,

		const int aPageNum, 

		const int aItemsPerPage )

	{

	qDebug()<<"Inside LastFmMusicServicePlugin::searchEvents()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

	if( aPageNum < 0 || aItemsPerPage < 0 || aEvent.id().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);

	// Create the API signature string

	QString baseString;

	baseString.append("api_key"+apiKey);

	baseString.append("event"+aEvent.id());

	baseString.append("methodevent.getInfo");

	baseString.append(apiSecret);

	// Create the url

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

	url.addQueryItem("event", aEvent.id());

	url.addQueryItem("api_key", apiKey);

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

	url.addQueryItem("method", "event.getInfo");

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

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iRequestType = SmfMusicSearchEvent;

	aRequest.iPostData = NULL;

	aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

	error = SmfPluginErrNone;

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

	return error;

	}

/**

 * Method to search information about venue. All information 

 * in SmfLocation is not required, however more available the better

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

 * @param aVenue [in] The venue which is the search criteria

 * @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 LastFmMusicServicePlugin::searchVenue( 

		SmfPluginRequestData &aRequest,

		const SmfLocation &aVenue,

		const int aPageNum, 

		const int aItemsPerPage )

	{

	qDebug()<<"Inside LastFmMusicServicePlugin::searchVenue()";

	SmfPluginError error = SmfPluginErrInvalidArguments;

	// invalid arguments

	if( aPageNum < 0 || aItemsPerPage < 0 || aVenue.name().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);

	// Create the API signature string

	QString baseString;

	baseString.append("api_key"+apiKey);

	baseString.append("limit"+QString::number(aItemsPerPage));

	baseString.append("methodvenue.search");

	baseString.append("page"+QString::number(aPageNum));

	baseString.append("venue"+aVenue.name());

	baseString.append(apiSecret);

	// Create the url

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

	url.addQueryItem("venue", aVenue.name());

	url.addQueryItem("api_key", apiKey);

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

	url.addQueryItem("limit", QString::number(aItemsPerPage));

	url.addQueryItem("page", QString::number(aPageNum));

	url.addQueryItem("method", "venue.search");

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

	// Create the request, set the url

	aRequest.iNetworkRequest.setUrl(url);

	aRequest.iRequestType = SmfMusicSearchVenue;

	aRequest.iPostData = NULL;

	aRequest.iHttpOperationType = QNetworkAccessManager::GetOperation;

	error = SmfPluginErrNone;

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

	return error;

	}

/**

 * Method to search information about other service users for a