/**
 * Logging Component
 *
 * This section uses system & user-assigned variables to
 * create a meaningful entry in the uuid webserver access
 * log.
 */


/**
 * LogEntry class encapsulates user and system-defined parameters
 */

function LogEntry() {

    // public fields with default values
    //
    // these fields can be modified by the client
    // using accessor methods defined below

    this.dob = '';
    this.zip = '';
    this.userId = '';

    this.searchRadius = '';
    this.searchCategory = '';
    this.searchFilterCategory = '';
    this.searchFilterKeyword = '';
    this.eventDetailName = '';
    this.searchGenre = '';
    this.outpostVendorName = '';
    this.outpostChannel = '';
    this.outpostDesign = '';
    this.outpostCopy = '';
    this.depth = '';


    // public accessors to override default values
    //

    this.setDob = new Function("dob", "this.dob = dob;");
    this.setZip = new Function("zip", "this.zip = zip;");
    this.setUserId = new Function("userId", "this.userId = userId;");

    this.setSearchRadius = new Function("searchRadius", "this.searchRadius = searchRadius;");
    this.setSearchCategory = new Function("searchCategory", "this.searchCategory = searchCategory;");
    this.setSearchFilterCategory = new Function("searchFilterCategory", "this.searchFilterCategory = searchFilterCategory;");
    this.setSearchFilterKeyword = new Function("searchFilterKeyword", "this.searchFilterKeyword = searchFilterKeyword;");
    this.setEventDetailName = new Function("eventDetailName", "this.eventDetailName = eventDetailName;");
    this.setSearchGenre = new Function("searchGenre", "this.searchGenre = searchGenre;");
    this.setOutpostVendorName = new Function("outpostVendorName", "this.outpostVendorName = outpostVendorName;");
    this.setOutpostChannel = new Function("outpostChannel", "this.outpostChannel = outpostChannel;");
    this.setOutpostDesign = new Function("outpostDesign", "this.outpostDesign = outpostDesign;");
    this.setOutpostCopy = new Function("outpostCopy", "this.outpostCopy = outpostCopy;");
    this.setDepth = new Function("depth", "this.depth = depth;");



    // private fields
    //
    // these fields are set from the DOM

    this.clientHost = document.location.host;

    var stringArray = new String(document.location.pathname).split("/");
    if (stringArray.length > 1) {
        this.clientContextPath = stringArray[1];
    }
    else {
        this.clientContextPath = "";
    }

    this.clientReferer = document.referrer;
    this.clientTitle = document.title;
    this.clientURL = document.URL;
    this.browserLanguage = getBrowserLanguage();

    // private methods used by Logger
    //

    this.getSystemParams = LogEntryGetSystemParams;
    this.getUserParams = LogEntryGetUserParams;

    this.getLUID = LogEntryGetLUID;

}


/**
 * member function to concatenate system params that can be extracted from context
 */
function LogEntryGetSystemParams() {

    var queryStr  = "&_host=" + escape(this.clientHost)
                  + "&_referrer=" + escape(this.clientReferer)
                  + "&_title=" + escape(this.clientTitle)
                  + "&_lang=" + escape(this.browserLanguage)
                  + "&_url=" + escape(this.clientURL)
                  ;

    return queryStr;

}

/**
 * member function to concatenate params that are provided by application developers
 */
function LogEntryGetUserParams() {


    var queryStr  = "&_dob=" + escape(this.dob)
                  + "&_zip=" + escape(this.zip)
                  + "&_luid=" + escape(this.getLUID())
                  + "&_srchradius=" + escape(this.searchRadius)
                  + "&_srchcat=" + escape(this.searchCategory)
                  + "&_srchfltrcat=" + escape(this.searchFilterCategory)
                  + "&_srchfltrkywd=" + escape(this.searchFilterKeyword)
                  + "&_evtdtlnm=" + escape(this.eventDetailName)
                  + "&_srchgenre=" + escape(this.searchGenre)
                  + "&_outpostvndrnm=" + escape(this.outpostVendorName)
                  + "&_outpostchnl=" + escape(this.outpostChannel)
                  + "&_outpostdsgn=" + escape(this.outpostDesign)
                  + "&_outpostcpy=" + escape(this.outpostCopy)
                  + "&_depth=" + escape(this.depth)
                  ;

    return queryStr;
}


/**
 * Member function to create the LUID from the shorthand appname and userId
 */
function LogEntryGetLUID() {

    if (this.userId.length > 0)
       return this.userId;
    else
       return '';

}


/**
 * Public function to initiate logging
 */
function log(logEntry) {

    // construct logging url
    loggingURL = getTrackingURL();
    queryStr = '?a=a';

    // add automatic parameters to query string
    queryStr += logEntry.getSystemParams();

    // add developer-provided params to query str
    queryStr += logEntry.getUserParams();

    // add the cache-busting parameter;
    queryStr += getRandomParam()

    // execute log request
    loggingImg = new Image();
    loggingImg.src = (loggingURL + queryStr);

}

/**
 * Private function to build the URL to
 */
function getServerURL() {

    // scheme for protocol
    var loggingScheme = "http://";

    // host name for logging server
    var loggingHost = "beer.millerbrewing.com";

    // context path for logging server
    // -- "/" if talking to ROOT webapp
    var loggingContextPath = "/tracking";

    var loggingURL = loggingScheme
        + loggingHost
        + loggingContextPath ;

    return loggingURL;
}


/**
 * Private function to build a logged request to the pagedot
 */
function getTrackingURL() {

    // the tracking server returns 1x1 invisible gif for all gif requests.
    var loggingGif = "/1pixel.gif";

    var loggingURL = getServerURL() + loggingGif;

    return loggingURL;
}

/**
 * Private function to return a random name/value pairs
 * r1 = unix time in millis
 * r2 = random num between 0 and 1
 */
function getRandomParam() {

    var r1 = new Date().valueOf();
    var r2 = Math.random();
    return ("&_r1=" + r1 + "&_r2=" + r2);

}


/**
 * Private function to determine browser language
 *
 */
function getBrowserLanguage() {

    var lang = "";
    if ( navigator.userAgent.indexOf("MSIE") > -1 ) lang = navigator.browserLanguage;
    else lang = navigator.language;

    return lang.toLowerCase();
}