window.onload = function () {
    var query = window.location.search.split('?');
    var articleName = window.location.pathname
        .substring(1)
        .replace(/^(\/+)|(\/+)$|(\.\w{1,4})/gi, '') // replace trailing slashes
    ;

    var parameters = {};
    if (query.length > 1) {
        var data = query[1].split('&');
        var parameter;
        var i;

        for (i in data) {
            parameter = data[i].split('=');
            if (parameter.length === 2) {
                parameters[parameter[0]] = decodeURIComponent(parameter[1]);
            }
        }
    }
    
    var debug = Boolean(parameters['debug'] || false);
    debug && console.log('article: ' + articleName)
    
    if (articleName) {
        var getCookie = function (cname) {
            var name = cname + "=";
            var ca = document.cookie.split(';');
            for(var i = 0; i < ca.length; i++) {
                var c = ca[i];
                while (c.charAt(0) == ' ') {
                    c = c.substring(1);
                }
                if (c.indexOf(name) == 0) {
                    return c.substring(name.length, c.length);
                }
            }
            return "";
        }
        
        var id = parameters['id']
            || getCookie('greatagent-campaign-tracker-lead-id')
            || null;

        debug && console.log('lead: ' + id);
        // track article reading
        if (id) {
            query = {
                ts: + new Date(),
                action: 'read-article',
                id: id,
                tags: articleName
            };

            parameters = [];
            for (i in query) {
                parameters.push([i,query[i]].join('='))
            }

            debug && console.dir(parameters);

            var img  = document.createElement("img");
            img.src  = "/leads-web-activity/endpoints/tracker.php?" + parameters.join('&');
            
            debug && console.log('src: ' + img.src);
            
            document
                .getElementsByTagName('body')[0]
                .appendChild(img);
        }
    }
};