function Panaur(outside_settings) {
    var settings = outside_settings || [];
    var tags = [];
    this.getTags = function () {
        return tags.concat(_panaur._addTags);
    };
    this.status = 0;

    this.getStatus = function () {
        // false - not supported
        // 1 - allow
        // -1 - deny
        // 0 - dont know
        return _panaur.status;
    };
    this.init = function () {
        events.showPrompt = [_panaur.showPrompt];
        events.onAllow = [function () {
                this.status = 1;
            }, function () {
                //_panaur.closePrompt()
            }];
        events.onDeny = [function () {
                this.status = -1;
            }];
        events.onNonSupport = [function () {
                this.status = false;
            }];
        events.onInit = [];
        events.start = [this.start];
        events.unSubscribe = [this.uns];


        for (var i = 0; i < settings.length; i++) {
            var name = settings[i][0];
            if (name == 'settings' || name=='setting') {
                var key = settings[i][1];
                var value = settings[i][2];
                if (key == 'autostart') {
                    is_auto_start = value;
                    continue;
                }
                if (key == 'setTag') {
                    tags.push(value);
                    continue;
                }
            }
            if (name in events) {
                events[name].push(settings[i][1]);
            }


        }
        this.start();

    };

    this.fire = function (event, values) {
        var values = values || {};
        if (event in events) {
            for (var i = 0; i < events[event].length; i++) {
                if (!events[event][i](values)) {
                    //return false;
                }
            }
        }

    };
    var events = {
    };
    
    this._sid = false;
    this.getSid = function () {
        return _panaur._sid;
    };
    this._addTags = [];
    this.addTag = function (tag) {
        _panaur._addTags.push(tag);
        return _panaur._addTags;
    }
    this.resetTags = function () {
        _panaur._addTags = [];
        return _panaur._addTags;
    }
    this.commitTags = function (callback) {
        this.apiSend(_panaur.getSid(), callback);
    }

    var domain = "http://www.bio.msu.ru";
    var n = "http://www.bio.msu.ru";
    var remote_domain = "https://www_bio_msu_ru.panaur.com";
    var is_auto_start = true;
    var api_key = "d420f6d79ff5fc414bfa006081a34b00";
    var api_host = "https://api.panaur.com/api/";
    var db = null;
    var inteval1 = null;
    var remote_window = null;
    var b = {};
    var interval2 = false;
    var lang_wants = {
        ru: "запрашивает разрешение на:",
        en: "wants to:",
        ua: "просить дозволити на:"
    };
    var lang_show = {
        ru: "Показывать оповещения",
        en: "Show notifications",
        ua: "Показувати повiдомлення"
    };
    var lang_allow = {
        ru: "Разрешить",
        en: "Allow",
        ua: "Дозволити"
    };
    var lang_deny = {
        ru: "Запретить",
        en: "Block",
        ua: "Заборонити"
    };

    this.start = function () {

        if (!_panaur.getSite()) {
            _panaur.log("Application allowed only for " + domain);
            return false
        }
        if (_panaur.getOS() == "iOS") {
            _panaur.log("Application can not work on iOS");
            _panaur.fire('onNonSupport');
            return false
        }
        var browser = _panaur.detectBrowser();
        var browser_name = browser.name.toLowerCase();
        if ((browser_name == "chrome") && (parseFloat(browser.version) < 42)) {
            _panaur.fire('onNonSupport');
            return false
        }
        if ((browser_name == "firefox") && (parseFloat(browser.version) < 44)) {
            _panaur.fire('onNonSupport');
            return false
        }
        if ((browser_name == "safari") ) {
            _panaur.fire('onNonSupport');
            return false
        }
        if ((browser_name == "chrome") || (browser_name == "safari") || (browser_name == "firefox")) {
            window.addEventListener("message", function (message) {
                if (message.origin == remote_domain) {
                    if (message.data == "initend") {
                        clearInterval(inteval1)
                    } else if (
                            message.data.indexOf('ALLOW|') === 0) {
                        var m = message.data.split('|');
                        _panaur.fire('onAllow', JSON.parse(m[1]));

                    } else {
                        if (message.data == "closeme") {
                            remote_window.close()
                            _panaur.closePrompt();
                        } else {
                            _panaur.saveSid(message.data)
                            if (message.data == 'DENY') {
                                _panaur.fire('onDeny');
                            }
                        }
                    }
                }
            }, false);

            _panaur.getDBValue("sids", "sid", function (t) {
                if (t.target.result === undefined) {
                    _panaur.fire('onInit');
                    if (is_auto_start) {
                        _panaur.fire('showPrompt');
                    }
                    return;
                }

                if (t.target.result.value === 'DENY') {
                    _panaur.status = -1;
                } else {
                    _panaur.status = 1;
                    _panaur._sid = t.target.result.value;
                }
                _panaur.fire('onInit');
            })


        }
    };
    this.saveSid = function (sid) {
        _panaur.log("StoreSubscription: " + sid);
        _panaur.saveDB("sids", {
            type: "sid",
            value: sid
        })
    };
    this.clearDomain = function (domain) {
        return domain.replace("://www.", "://").replace("://www2.", "://")
    };
    this.getSite = function () {
        return (!(_panaur.clearDomain(window.location.href).indexOf(_panaur.clearDomain(domain)) === -1))
    };
    this.getBrowser = function () {
        var u, s = navigator.userAgent,
                r = s.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
        var v = s.match(/(edge(?=\/))\/?\s*(\d+)/i) || [];
        if ("Edge" === v[1]) {
            return {
                name: v[1],
                version: v[2]
            }
        }
        return /trident/i.test(r[1]) ? (u = /\brv[ :]+(\d+)/g.exec(s) || [], {
            name: "IE",
            version: u[1] || ""
        }) : "Chrome" === r[1] && (u = s.match(/\bOPR\/(\d+)/), null != u) ? {
            name: "Opera",
            version: u[1]
        } : (r = r[2] ? [r[1], r[2]] : [navigator.appName, navigator.appVersion, "-?"], null != (u = s.match(/version\/(\d+)/i)) && r.splice(1, 1, u[1]), {
            name: r[0],
            version: r[1]
        })
    }
    this.getBrowserlanguage = function () {
        return navigator.language.substring(0, 2)
    };
    this.getUserVariables = function () {

        var vars = {};
        return vars;

    };
    this.showPopUp = function () {
        var width = 660;
        var height =  480;
        var pos_left = window.screenLeft !== undefined ? window.screenLeft : screen.left;
        var pos_top = window.screenTop !== undefined ? window.screenTop : screen.top;
        var inner_width = window.innerWidth ? window.innerWidth : document.documentElement.clientWidth ? document.documentElement.clientWidth : screen.width;
        var inner_height = window.innerHeight ? window.innerHeight : document.documentElement.clientHeight ? document.documentElement.clientHeight : screen.height;
        var r = ((inner_width / 2) - (width / 2)) + pos_left;
        var v = ((inner_height / 3) - (inner_height / 3)) + pos_top;
        var language = _panaur.getBrowserlanguage();
        if (language == "") {
            language = "en";
        }
        remote_window = window.open(remote_domain + "/" + language + "/" + api_key, "_blank", "scrollbars=yes, width=" + width + ", height=" + height + ", top=" + v + ", left=" + r);
        if (window.focus) {
            remote_window.focus()
        }
        inteval1 = setInterval(function () {
            remote_window.postMessage("init", remote_domain);
            remote_window.postMessage("initpage|" + window.location.href, remote_domain);
            remote_window.postMessage("initvariables|" + JSON.stringify(_panaur.getTags()), remote_domain)
        }, 100);
        if (is_auto_start) {
            _panaur.closePrompt()
        }
    };
    this.showPrompt = function () {
        if (_panaur.getStatus() !== 0) {
            return;
        }
        var head = document.getElementsByTagName("head")[0];
        var css = document.createElement("link");
        css.rel = "stylesheet";
        css.type = "text/css";
        css.href = "https://panaur.com/template/_front/css.css";
        css.media = "all";
        head.appendChild(css);
        var lang = _panaur.getMessageLang(_panaur.getBrowserlanguage());
        if (!((document.charset.toLowerCase() == "utf8") || (document.charset.toLowerCase() == "utf-8"))) {
            lang = "en"
        }
        var over = document.createElement("div");
        over.setAttribute("class", "_panaur-welcome _panaur-popover");
        var s = document.createElement("div");
        s.setAttribute("class", "_panaur-welcome-message");
        var A = document.createElement("div");
        A.setAttribute("class", "_panaur-welcome-message-text");
        A.innerHTML = n + " " + lang_wants[lang];
        var u = document.createElement("div");
        u.setAttribute("class", "_panaur-welcome-info _panaur-prompt-message-text");
        var x = document.createElement("img");
        x.setAttribute("class", "_panaur-bell-icon");
        x.setAttribute("width", "14");
        x.setAttribute("height", "14");
        x.setAttribute("src", "https://panaur.com/template/ring.svg");
        u.appendChild(x);
        u.innerHTML += " " + lang_show[lang];
        var z = document.createElement("div");
        z.setAttribute("class", "_panaur-welcome-buttons");
        var v = document.createElement("button");
        v.setAttribute("class", "_panaur-welcome-btn _panaur-accept-btn");
        v.setAttribute("type", "button");
        v.setAttribute("onclick", "_panaur.showPopUp(); return false;");
        v.innerHTML = lang_allow[lang];
        var r = document.createElement("button");
        r.setAttribute("class", "_panaur-welcome-btn _panaur-disallow-btn");
        r.setAttribute("type", "button");
        r.setAttribute("onclick", "_panaur.denyMessage(); return false;");
        r.innerHTML = lang_deny[lang];
        var p = document.createElement("button");
        p.setAttribute("class", "_panaur-welcome-close");
        p.setAttribute("onclick", "_panaur.closePrompt(); return false;");
        p.innerHTML = "&times;";
        z.appendChild(v);
        z.appendChild(r);
        s.appendChild(A);
        s.appendChild(u);
        s.appendChild(z);
        over.appendChild(s);
        over.appendChild(p);
        document.body.appendChild(over)
    };
    this.denyMessage = function () {
        _panaur.saveSid("DENY");
        _panaur.fire('onDeny');
        _panaur.closePrompt()
    };
    this.closePrompt = function () {
        document.body.removeChild(document.querySelector("._panaur-welcome"))
    };
    this.openDB = function (callback) {
        if (db) {
            return void callback()
        }
        var storage = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
        var _db = storage.open("_panaur_db", 2);
        _db.onsuccess = function (res) {
            db = res.target.result;
            callback()
        };
        _db.onupgradeneeded = function (res) {
            var t = res.target.result;
            t.createObjectStore("sids", {
                keyPath: "type"
            })
        }
    };
    this.getDBValue = function (p, q, r) {
        _panaur.openDB(function () {
            db.transaction([p], "readonly").objectStore(p).get(q).onsuccess = r
        })
    };
    this.saveDB = function (p, sid) {
        _panaur.openDB(function () {
            db.transaction([p], "readwrite").objectStore(p).put(sid)
        })
    };
    this.deleteDbValue = function (p, q) {
        _panaur.openDB(function () {
            db.transaction([p], "readwrite").objectStore(p)["delete"](q)
        })
    };
    this.log = function (message) {
        if (console && console.log) {
            console.log(message);
        }
    };
    this.detectBrowser = function () {
        var r, user_agent = navigator.userAgent,
                p = user_agent.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
        var s = user_agent.match(/(edge(?=\/))\/?\s*(\d+)/i) || [];
        if ("Edge" === s[1]) {
            return {
                name: s[1],
                version: s[2]
            }
        }
        return /trident/i.test(p[1]) ? (r = /\brv[ :]+(\d+)/g.exec(user_agent) || [], {
            name: "IE",
            version: r[1] || ""
        }) : "Chrome" === p[1] && (r = user_agent.match(/\bOPR\/(\d+)/), null != r) ? {
            name: "Opera",
            version: r[1]
        } : (p = p[2] ? [p[1], p[2]] : [navigator.appName, navigator.appVersion, "-?"], null != (r = user_agent.match(/version\/(\d+)/i)) && p.splice(1, 1, r[1]), {
            name: p[0],
            version: p[1]
        })
    };
    this.getOS = function () {
        if (navigator.userAgent.indexOf("Windows") != -1) {
            return ("Windows");
        }
        if (navigator.userAgent.indexOf("Linux") != -1) {
            return ("Linux");
        }
        if (navigator.userAgent.indexOf("iPhone") != -1) {
            return ("iOS");
        }
        if (navigator.userAgent.indexOf("Mac") != -1) {
            return ("Mac OS");
        }
        if (navigator.userAgent.indexOf("FreeBSD") != -1) {
            return ("FreeBSD");
        }
        return ""
    };
    this.uns = function () {
        _panaur.apiSend(_panaur.getSid(), function () {
            _panaur.deleteDbValue("sids", "sid")
        }, 'out');

    };
    this.getMessageLang = function (ulang) {
        ulang = ulang.substring(0, 2).toLowerCase();
        if (ulang == "ua" || ulang == "uk") {
            return "ua"
        } else {
            if (ulang == "ru") {
                return "ru"
            } else {
                return "en"
            }
        }
    };
    this.push = function (p, q) {
        if (!_panaur.getSite()) {
            _panaur.log("Application allowed only for " + domain);
            return false
        }
        b[p] = q;
        _panaur.getDBValue("sids", "sid", function (r) {
            if (r.target.result === undefined) {
                if (!interval2) {
                    interval2 = setInterval(function () {
                        _panaur.getDBValue("sids", "sid", function (s) {
                            if (s.target.result !== undefined) {
                                _panaur.apiSend(s.target.result.value);
                                _panaur._sid = s.target.result.value;
                                this.fire('onAllow', {
                                    tags: _panaur.getTags(),
                                    sid: s.target.result.value,
                                    browser: _panaur.getBrowser(),
                                    lang: _panaur.getBrowserlanguage(),
                                    os: _panaur.getOS()
                                });
                                clearInterval(interval2);
                                interval2 = false
                            }
                        })
                    }, 1000)
                }
            } else {
                _panaur.apiSend(r.target.result.value)
            }
        })
    };
    this.apiSend = function (sid, callback, method) {
        var xhr = new XMLHttpRequest();
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4 && xhr.status == 200) {
                if (callback) {
                    var res = {};
                    res = JSON.parse(xhr.responseText)
                    callback.call(this, res);
                }
            }
        }
        xhr.open("POST", api_host, true);
        xhr.setRequestHeader("Content-Type", "application/json");
        var req = {
            method: method || "update",
            sid: sid,
            appkey: api_key,
            tags: _panaur.getTags(),
            browser: _panaur.getBrowser(),
            os: _panaur.getOS(),
            lang: _panaur.getBrowserlanguage()


        };
        xhr.send(JSON.stringify(req));
    }
}
window.addEventListener("load", function () {
    _panaur.init();


});
var _panaur = new Panaur(_panaur || []);