/**
 * Get the details about the page and add them to the Metrics Object
 *
 * @author Derrick Antaya
 */

function BN_Metrics() {
	this.api_data = {
		key: 'sDHRhYNcAY76jxfUf8TSMaMu8a10WkQaw6DJ4Vi3kboimcYAGX'
	};
	this.page_data = {
		page_type: this.get_meta('bn:page_type'),
		post_id: this.get_meta('bn:post_id'),
		post_title: this.get_meta('bn:post_title'),
		post_name: this.get_meta('bn:post_name'),
		post_date: this.get_meta('bn:post_date'),
		post_modified: this.get_meta('bn:post_modified'),
		post_type: this.get_meta('bn:post_type'),
		post_category: this.get_meta('bn:post_category'),
		post_template: this.get_meta('bn:post_template'),
		page_url: window.location.href
	};
	this.visitor_data = {
		referrer: this.get_referrer(),
		view_port: this.check_view_port(),
		user_data: this.user_data('bnUserInfo'),
		client_id: this.client_id('TPCI'),
	};
};

BN_Metrics.prototype = {
	construct: BN_Metrics,
	track: function (action, selector) { // track various types of behavior
		// set defaults
		var action = (action == null) ? null : action;
		var selector = (selector == null) ? null : selector;

		switch (action) {
			case 'view':
				var data = {
					type: 'view',
					api: this.api_data,
					page: this.page_data,
					visitor: this.visitor_data
				};
				this.send(data);
				break;
			case 'click':
				document.getElementById(selector).onclick = function(e) {
					var data = {
						type: 'click'
					};
					bn_metrics.send(data);
				};
				break;
			default:
				return;
		}
	},
	send: function (data) {
		var data = (data == null) ? null : data;

		var xapi = new XMLHttpRequest();

	    xapi.onreadystatechange = function() {
			if (xapi.readyState == XMLHttpRequest.DONE) {
				if (xapi.status == 400) {
					// @TODO: figure out what to do in error state
				} else {
					var response = JSON.parse(xapi.response);
					// handle the responses
					if (typeof response.pw != 'undefined') {
						// handle paywall
						bn_metrics.pw(response.pw);
					}
				}
			}
		};

	    xapi.open('POST', 'https://bnapi.buffalonews.com/metrics/api/v1/track/1y9WbPk5fHPLhStc2nrD10OT8kK7KWn0', true);
		xapi.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		xapi.send('data=' + encodeURIComponent(JSON.stringify(data)));
	},
	get_meta: function (name) { // get attribute from meta tag by name
		var $meta = document.querySelector("meta[name='" + name + "']");

		// return empty string if the meta doesnt exist
		if ($meta == null) {
			return '';
		}

		return $meta.getAttribute('content');
	},
	client_id: function (name) { // get or make a client id
		var client_id = this.get_cookie(name);
		if (!client_id) {
			client_id = this.generate_id(64);
			this.set_cookie(name, client_id);
		}

		return client_id;
	},
	user_data: function (name) { // get user data
		var Base64 = {_keyStr:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",encode:function(e){var t="";var n,r,i,s,o,u,a;var f=0;e=Base64._utf8_encode(e);while(f<e.length){n=e.charCodeAt(f++);r=e.charCodeAt(f++);i=e.charCodeAt(f++);s=n>>2;o=(n&3)<<4|r>>4;u=(r&15)<<2|i>>6;a=i&63;if(isNaN(r)){u=a=64}else if(isNaN(i)){a=64}t=t+this._keyStr.charAt(s)+this._keyStr.charAt(o)+this._keyStr.charAt(u)+this._keyStr.charAt(a)}return t},decode:function(e){var t="";var n,r,i;var s,o,u,a;var f=0;e=e.replace(/[^A-Za-z0-9+/=]/g,"");while(f<e.length){s=this._keyStr.indexOf(e.charAt(f++));o=this._keyStr.indexOf(e.charAt(f++));u=this._keyStr.indexOf(e.charAt(f++));a=this._keyStr.indexOf(e.charAt(f++));n=s<<2|o>>4;r=(o&15)<<4|u>>2;i=(u&3)<<6|a;t=t+String.fromCharCode(n);if(u!=64){t=t+String.fromCharCode(r)}if(a!=64){t=t+String.fromCharCode(i)}}t=Base64._utf8_decode(t);return t},_utf8_encode:function(e){e=e.replace(/rn/g,"n");var t="";for(var n=0;n<e.length;n++){var r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r)}else if(r>127&&r<2048){t+=String.fromCharCode(r>>6|192);t+=String.fromCharCode(r&63|128)}else{t+=String.fromCharCode(r>>12|224);t+=String.fromCharCode(r>>6&63|128);t+=String.fromCharCode(r&63|128)}}return t},_utf8_decode:function(e){var t="";var n=0;var r=c1=c2=0;while(n<e.length){r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r);n++}else if(r>191&&r<224){c2=e.charCodeAt(n+1);t+=String.fromCharCode((r&31)<<6|c2&63);n+=2}else{c2=e.charCodeAt(n+1);c3=e.charCodeAt(n+2);t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);n+=3}}return t}}

		var userInfo = this.get_cookie(name);
		if (!userInfo) {
			return null;
		}

		return Base64.decode(decodeURIComponent(userInfo));
	},
	get_referrer: function () { // get the pages referrer
		if (document.referrer) {
			var url = document.referrer;
			//var ref = url.match(/^http([s]?):\/\/([a-zA-Z0-9-_\.]+)(:[0-9]+)?/)[0];
			var ref = url.match(/^(http([s]?)|android-app):\/\/([a-zA-Z0-9-_\.]+)(:[0-9]+)?/)[0];
	 		return ref + '/';
		}

	 	return '';
	},
	check_view_port: function () { // check screen size
		var width = window.innerWidth;

		if (width <= 767) {
			return 'mobile website';
		} else if (width >= 768 && width < 992) {
			return 'tablet-v website';
		} else if (width >= 992 && width < 1200) {
			return 'tablet-h website';
		} else {
			return 'desktop website';
		}
	},
	generate_id: function (length) { // build a client id string
		var string = '';

		var randomchar = function () {
			var n = Math.floor(Math.random() * 62);
			if (n < 10) {
				return n; //1-10
			}
			if (n < 36) {
				return String.fromCharCode(n + 55); //A-Z
			}
			return String.fromCharCode(n + 61); //a-z
		}

		while (string.length < length) {
			string += randomchar();
		}

		return string;
	},
	set_cookie: function (name, value, domain) { // set cookies
		var date = new Date();
		date.setTime(date.getTime() + (10000 * 24 * 60 * 60 * 1000));
		var expires = "expires=" + date.toUTCString();
		document.cookie = name + "=" + value + "; " + expires + ";domain=" + domain;
	},
	get_cookie: function (name) { // get cookies
		var name = name + "=";
		var cookies = document.cookie.split(';');
		for(var i = 0; i < cookies.length; i++) {
			var cookie = cookies[i];
			while (cookie.charAt(0) == ' ') {
				cookie = cookie.substring(1);
			}
			if (cookie.indexOf(name) == 0) {
				return cookie.substring(name.length, cookie.length);
			}
		}
		return null;
	},
	pw: function (pw) { // handle the setting and redirecting of the paywall
		// redirect if the criteria are met or just return if on the limit reached page or a non counted page
		if (
			window.location.href !== pw.redirect_url
			&& pw.count_page === 1
			&& pw.exception === 0
			&& pw.remaining_views < 0
		) {
			window.location.replace(pw.redirect_url);
			return true;
		} else if (
			window.location.href === pw.redirect_url
			|| pw.footer.html === ''
		) {
			return true;
		}

		// add the paywall footer css to the page
		// avoid duplicates
	    for(var i = 0; i < document.styleSheets.length; i++){
	        if(document.styleSheets[i].href == pw.footer.css){
	            return true;
	        }
	    }
	    var head = document.getElementsByTagName('head')[0];
	    var link = document.createElement('link');
	    link.rel = 'stylesheet';
	    link.type = 'text/css';
	    link.href = pw.footer.css;
	    head.appendChild(link);

		// add paywall footer to the page
		var body = document.getElementsByTagName('body')[0];
		var div = document.createElement('div');
		div.setAttribute('id', 'paywall-footer');
  		div.innerHTML = pw.footer.html;
		body.appendChild(div.firstChild);
		div = null;
	}
}

var bn_metrics = new BN_Metrics();