/**
@module Tracker 
 */
var common  = require('../common'),
 urlHelper  = require('url');

var getRefererInformation = function (refererUrl, currentUrl, idSite)
{
/**
@class getRefererInformation
@constructor 
@params refererUrl {String} The document.referrer of visited  url
@params currentUrl {String} The current visiting url
@params Id {Number} Profile Id of registerd website.
@getRefererInformation class provides get the referrer information of the visited url. 
*/
		this.idsite = idSite;
		this.CONSTANTS = require('./constants');
		// default values for the referer_* fields
		this.refererUrl = refererUrl;
		this.currentUrl = currentUrl;
		this.refererUrlParse = '';
		this.currentUrlParse = '';
		this.typeRefererAnalyzed ='';
		this.nameRefererAnalyzed = '';
		this._det = {utm_source:'',utm_term:'',utm_medium:'',utm_content:'',utm_campaign:''};
		this.refererHost = '';
		this.init();
}
getRefererInformation.prototype.init = function(){
/**
@method init
@initializes the class variables.
@return {Void} . 
*/
		this.refererUrl = this.unsanitizeInputValue(this.refererUrl);
		this.refererUrlParse = common.isset(this.refererUrl)? urlHelper.parse(this.refererUrl,1):undefined;
		this.currentUrlParse = common.isset(this.currentUrl)? urlHelper.parse(this.currentUrl,1):undefined;
		this.nameRefererAnalyzed=this.CONSTANTS.REFERER_TYPE_DIRECT_ENTRY;
		this.refererHost = common.isset(this.refererUrlParse)?this.refererUrlParse.host:'';
	
}
getRefererInformation.prototype.unsanitizeInputValue = function(refererUrl){
/**
@method unsanitizeInputValue
@return {String} url with unwanted things removed. 
*/

	return refererUrl;
	
}

getRefererInformation.prototype.isParams=function (url)
{
/**
@method isParams
@params url the url 
@return {Boolean} of Query string variables as object.
*/
	
	return ( url.split('?')[1] == undefined) ? false : true;

}


getRefererInformation.prototype.getRefererObject=function (){
/**
* using to  getRefererInformation from url.
@method getRefererObject
@return {object}  returns following format 
{
				'RefererType' 		: value,
				'RefererName' 		: value,
				'RefererKeyword' 	: value,
				'RefererUrl' 		: value
			}
*/

//check campaign,check direct, check 
	if(common.isset(this.refererUrlParse) && common.isset(this.refererUrlParse['host']))
		{
			 this.refererHost = this.refererUrlParse['host'];
		}

		var refererDetected = false;
		var campaign =	this.detectRefererCampaign();
		if( !common.empty(this.currentUrlParse['host']) && campaign )
		{
			refererDetected = true;
			this._det = campaign;
			this.typeRefererAnalyzed = this.CONSTANTS.REFERER_TYPE_CAMPAIGN_ENTRY;

		}

		if(!refererDetected && !common.empty(this.refererHost) )
		{
			if(this.detectRefererSearchEngine()){
				refererDetected = true;
				this.typeRefererAnalyzed = this.CONSTANTS.REFERER_TYPE_ORGANIC_ENTRY;
				this.wrapOrganicUtm();

			}

			if(!refererDetected)  
			{
				refererDetected = true;
				this.typeRefererAnalyzed = this.CONSTANTS.REFERER_TYPE_REFERRAL_ENTRY;
				this.wrapReferralUtm();
			}
			
		}

		if( this.detectRefererDirectEntry() && !refererDetected)
		{
			this.typeRefererAnalyzed = this.CONSTANTS.REFERER_TYPE_DIRECT_ENTRY;
			this.wrapDirectUtm();
			
		}

		return {
				'RefererType' 		: this.typeRefererAnalyzed,
				'refererUrlParse'	: this.refererUrlParse,
				'currentUrlParse'	: this.currentUrlParse,
				'utm'			: this._det		

		};
	
}

getRefererInformation.prototype.wrapDirectUtm = function(){
/**
* wraping up the utm parameters
* It will set the utm details of the current visit
@method wrapDirectUtm
*/
	this._det.utm_medium = this.typeRefererAnalyzed;
	this._det.utm_source= this.refererHost;

}

getRefererInformation.prototype.wrapReferralUtm = function(){
/**
* wraping up the utm parameters
* It will set the utm details of the current visit
@method wrapReferalUtm
*/
	this._det.utm_medium = this.typeRefererAnalyzed;
	this._det.utm_source= this.refererHost;

}
getRefererInformation.prototype.wrapOrganicUtm = function(){
/**
* wraping up the utm parameters
* It will set the utm details of the current visit
@method wrapOrganicUtm
*/
	this._det.utm_medium = this.typeRefererAnalyzed;
	this._det.utm_source= this.refererHost;
	if(common.isset(this.refererUrlParse.query.q))
	this._det.utm_term = this.refererUrlParse.query.q;

}

getRefererInformation.prototype.detectRefererCampaign = function()
{
/**
* using detect campaign for current visit.
* not implimented.
@method detectRefererCampaign
@return {Boolean}.

*/
if (!common.empty(this.currentUrlParse['query'])   && !common.isset(this.currentUrlParse['fragment'])) {
            return false;
      }
        this.campaignParameters = this.getCampaignParameters();
	/*
        this.campaignNames = campaignParameters[0];
        this.campaignKeywords = campaignParameters[1];
	*/

        var found = false;

	found = this.detectCampaign();
	
	return found;

      

}

getRefererInformation.prototype.getCampainFromUrl = function(campaignNames,parameters) {
/**
* using detect campaign for current url parameters.
* not implimented.
@method getCampainFromUrl
@params campaignNames {Array}, params{Array} 
@return {Array}.

*/

var campaign=[];

for ( var campaignNameParameter in campaignNames ) {       
	if(parameters[campaignNameParameter])
	campaign[campaignNameParameter] = parameters[campaignNameParameter];
        }
return campaign;

}

getRefererInformation.prototype.detectCampaign = function(){
/**
* using detect campaign for current url parameters.
* not implimented
@method detectCampaign
@return {Object} this contains array of campaigns as key value pairs
*/

var campaign = this.getCampainFromUrl(this.campaignNames,this.currentUrlParse);
	if(campaign.length == 0 )	 
        campaign = this.getCampainFromUrl(this.campaignNames,this.currentreferralParse);
	return campaign;
}

getRefererInformation.prototype.detectRefererSearchEngine=function()
{
/**
* Search engine detection not implemented
* @return bool
*/

return  common.isset(this.refererUrlParse) && common.isset(this.refererUrlParse.host) && this.refererUrlParse.host.search('google') > -1;
	
}

getRefererInformation.prototype.getCampaignParameters = function()
{
/**
@method getCampaignParameters
@return {Array} hostname of the url.
@to get the host name of the current url.
*/
 	
return ['utm_source','utm_term','utm_medium','utm_content','utm_campaign','gclid'];

}

getRefererInformation.prototype.detectRefererDirectEntry = function()
{
/**
@method detectRefererDirectEntry
@return {Boolean} .
*/
	
return  !common.isset(this.refererUrlParse);

}

//exporting.
module.exports.getRefererInformation = exports.getRefererInformation = getRefererInformation;