var trackerUser = '';
var trackerSession = 'm4ir91tun1egtoi3rlsb30r9kh';

'use strict';

var Tracker = function () {

	this.ajaxUrl = 'https://ajax.wogibtswas.net/tracker.php';

	this.initialize();

	$(window).on('unload', function () { window.tracker.windowUnload(); });
	$(window).on('blur focus', function (event) { window.tracker.updateWindowState(event); });

	this.setEventActionHandler();
	this.setEventInterval();

	this.sendRequest('request');
};

Tracker.prototype.initialize = function () {

	this.request = {};
	this.cfg = {};

	this.cfg.eventTypes = 'mousemove mousedown touchstart click scroll keypress';

	this.cfg.tracking = true; // ist das tracking gerade in/aktiv
	this.cfg.windowState = 'focus'; // ist das fenster gerade in/aktiv
	this.cfg.eventCount = 0; // anzahl events seit dem letzten interfall
	this.cfg.requestCount = 0; // anzahl der bereits gemachten requests
	this.cfg.lastAction = Date.now(); // letzter intervall mit erkannter action

	this.cfg.requestInterval = 5000; // initialer intervall der requests
	this.cfg.idleTimeout = 120000; // maximale zeit ohne action/events
	this.cfg.idleCheck = 5000; // prüfintervall für actions/events
	this.cfg.requestFactor = 1.5; // faktor zur erhöhung der request abstände
	this.cfg.requestPeriod = 5; // alle wieviel requests der timeout erhöht wird
};

Tracker.prototype.setEventActionHandler = function (active = true) {

	this.cfg.eventCount = 0;

	if (typeof this._countEventActionHandler !== 'function') {

		this._countEventActionHandler = function () { window.tracker.cfg.eventCount += 1; };
	}

	if (active) $(window).on(this.cfg.eventTypes, this._countEventActionHandler);
	else $(window).off(this.cfg.eventTypes, this._countEventActionHandler);
}

Tracker.prototype.setEventInterval = function (active = true) {

	if (this.eventInterval) window.clearInterval(this.eventInterval);

	if (active) this.eventInterval = window.setInterval(function () { window.tracker.checkEventCount(); }, this.cfg.idleCheck);
	else window.clearInterval(this.eventInterval);
};

Tracker.prototype.setRequestTimeout = function (active = true) {

	if (this.requestTimeout) window.clearTimeout(this.requestTimeout);

	if (active) this.requestTimeout = window.setTimeout(function () { window.tracker.sendRequest(); }, this.cfg.requestInterval);
	else window.clearTimeout(this.requestTimeout);
};

Tracker.prototype.windowReactivate = function () {

	this.initialize();
	this.sendRequest('request');
};

Tracker.prototype.windowInactive = function () {

	this.setRequestTimeout(false);
	this.sendRequest('inactive');

	this.cfg.tracking = false;
};

Tracker.prototype.windowUnload = function () {

	if (this.cfg.tracking) this.sendRequest('leaving', true);
};

Tracker.prototype.updateWindowState = function (event) {

	if (this.cfg.windowState != event.type) {

		this.cfg.windowState = event.type;

		if (this.cfg.windowState == 'blur') {

			this.setEventActionHandler(false);
			this.setRequestTimeout(false);
		}

		if (this.cfg.windowState == 'focus') {

			this.setEventActionHandler();

			if (this.cfg.tracking) this.sendRequest();
		}
	}
};

Tracker.prototype.checkEventCount = function () {

	var timestamp = Date.now();

	if (this.cfg.eventCount > 0) {

		if (this.cfg.tracking === false) this.windowReactivate();

		this.cfg.lastAction = timestamp;
		this.cfg.eventCount = 0;
	}

	if (timestamp > this.cfg.lastAction + this.cfg.idleTimeout && this.cfg.tracking) {

		this.windowInactive();
	}
};

Tracker.prototype.sendLinks = function () {

	if (!document.getElementById('trackerLinks')) return;

	let dataLinks = $('[data-tracker="link"]');

	if (dataLinks.length < 0) return;

	let formData = new FormData();
	let trackerLinks = $('#trackerLinks');

	formData.append('session', trackerSession);
	formData.append('type', 'links');
	formData.append('page', trackerLinks.data('page'));
	formData.append('term', trackerLinks.data('term'));
	formData.append('city', trackerLinks.data('city'));

	if (trackerUser != '') formData.append('user', trackerUser);

	let keys = [];

	dataLinks.each((_, elem) => {

		keys.push($(elem).data('key'));
	});

	formData.append('keys', JSON.stringify(keys));

	$.ajax({

		dataType: 'json', async: true, cache: false, type: 'post',
		url: this.ajaxUrl, data: formData, processData: false, contentType: false,
	});
};


Tracker.prototype.sendAds = function () {

	if (!document.getElementById('trackerAds')) return;

	let dataAds = $('[data-tracker="ads"]');

	if (dataAds.length < 0) return;

	let formData = new FormData();
	let trackerAds = $('#trackerAds');

	formData.append('session', trackerSession);
	formData.append('type', 'links');
	formData.append('page', trackerAds.data('page'));
	formData.append('term', trackerAds.data('term'));
	formData.append('city', trackerAds.data('city'));

	if (trackerUser != '') formData.append('user', trackerUser);

	let keys = [];

	dataAds.each((_, elem) => {

		keys.push($(elem).data('key'));
	});

	formData.append('keys', JSON.stringify(keys));

	$.ajax({

		dataType: 'json', async: true, cache: false, type: 'post',
		url: this.ajaxUrl, data: formData, processData: false, contentType: false,
	});
};


Tracker.prototype.sendRequest = function (type = 'update', beacon = false) {

	var formData = new FormData();

	formData.append('session', trackerSession);
	formData.append('href', window.location.href);
	formData.append('type', type);

	if (trackerUser != '') formData.append('user', trackerUser);

	if (type == 'request') {

		formData.append('data[width]', window.screen.width);
		formData.append('data[height]', window.screen.height);

		let trackerSettings = $('#trackerSettings');

		if (trackerSettings.length > 0) {

			formData.append('page', trackerSettings.data('page'));
			formData.append('key', trackerSettings.data('key'));
		}
	}

	if (type == 'inactive') {

		formData.append('bounce', Math.round(this.cfg.lastAction / 1000, 2));
	}

	if (('navigator' in window) && ('sendBeacon' in window.navigator) && beacon) {

		navigator.sendBeacon(this.ajaxUrl, formData);
	}
	else $.ajax({

		dataType: 'json', async: true, cache: false, type: 'post',
		url: this.ajaxUrl, data: formData, processData: false, contentType: false,
	}).always(() => { if (type == 'request') this.sendLinks(); this.sendAds(); });

	if (type == 'request' || type == 'update') {

		this.cfg.requestCount += 1;

		if (this.cfg.requestCount % this.cfg.requestPeriod == 0) {

			this.cfg.requestInterval = Math.round(this.cfg.requestInterval * this.cfg.requestFactor);
		}

		this.setRequestTimeout();
	}
};

$(function () {

	window.tracker = new Tracker();
});