;(function (root, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            (root.iNotify = factory());
}(this, function (root, undefined) {
    var repeatableEffects = ['flash', 'scroll'],
        defaultNotification = {
            title: "通知！",
            body: '您来了一条新消息',
            openurl: ''
        },
        iconURL = "";

    function iNotify(config) {
        if (config) {
            this.init(config);
        }
    }

    iNotify.prototype = {
        init: function (config) {
            if (!config) {
                config = {};
            }
            this.interval = config.interval || 200; //响应时长
            this.effect = config.effect || 'flash'; //效果
            this.title = config.title || document.title; //标题
            this.message = config.message || this.title; //原来的标题
            this.onclick = config.onclick || this.onclick; //点击事件
            this.openurl = config.openurl || this.openurl; //点击事件
            this.updateFavicon = config.updateFavicon || {
                id: "favicon",
                textColor: "#fff",
                backgroundColor: "#2F9A00"
            }
            this.audio = config.audio || '';
            this.favicon = getFavicon(this.updateFavicon);
            this.favicon = this.favicon;
            this.cloneFavicon = this.favicon.cloneNode(true);
            defaultNotification.icon = iconURL = (config.notification && config.notification.icon) ? config.notification.icon : (config.icon ? config.icon : this.favicon.href);
            this.notification = config.notification || defaultNotification;
            //初始化生成声音文件节点
            if (this.audio && this.audio.file) {
                this.setURL(this.audio.file)
            }
            return this;
        },
        render: function () {
            switch (this.effect) {
                case 'flash':
                    document.title = (this.title === document.title) ? this.message : this.title;
                    break;
                case 'scroll':
                    document.title = document.title.slice(1);
                    if (0 === document.title.length) {
                        document.title = this.message;
                    }
                    break;
            }
        },
        setURL: function (url) {
            if (url) {
                if (this.audioElm) {
                    this.audioElm.remove();
                }
                this.audioElm = createAudio(url);
                document.body.appendChild(this.audioElm);
            }
            return this;
        },
        loopPlay: function () {
            this.setURL();
            this.audioElm.loop = true;
            this.player();
            return this;
        },
        stopPlay: function () {
            this.audioElm && (this.audioElm.loop = false, this.audioElm.pause());
            return this;
        },
        //播放声音
        player: function () {
            var adi = this.audio.file,
                source = null;
            if (!this.audio || !this.audio.file) {
                return;
            }
            if (!this.audioElm) {
                this.audioElm = createAudio(this.audio.file);
                document.body.appendChild(this.audioElm)
            }
            this.audioElm.play();
            return this;
        },
        notify: function (json) {
            var nt = this.notification;
            var url = json.openurl ? json.openurl : this.openurl;
            var onclick = json.onclick ? json.onclick : this.onclick;
            if (window.Notification) {
                if (json) {
                    nt = jsonArguments(json, nt);
                } else {
                    nt = defaultNotification;
                }
                var n = new Notification(nt.title, {
                    icon: json.icon ? json.icon : iconURL,
                    body: nt.body
                });
                n.onclick = function () {
                    (onclick && typeof(onclick) === "function") && onclick(n);
                    url && window.open(url);
                }
            }
            return this;
        },
        //是否许可弹框通知
        isPermission: function () {
            return window.Notification && Notification.permission === "granted" ? true : false;
        },
        //设置标题
        setTitle: function (str) {
            if (str === true) {
                if (0 <= repeatableEffects.indexOf(this.effect)) {
                    return this.addTimer();
                }
            } else if (str) {
                this.message = str,
                    this.addTimer();
            } else {
                this.clearTimer(),
                    this.title = this.title;
            }
            return this;
        },
        //设置时间间隔
        setInterval: function (num) {
            if (num) {
                this.interval = num,
                    this.addTimer();
            }
            return this;
        },
        //设置网页Icon
        setFavicon: function (num) {
            if (!num && num !== 0) {
                return this.faviconClear();
            }
            var oldicon = document.getElementById('new' + this.updateFavicon.id)
            if (this.favicon) {
                this.favicon.remove();
            }
            if (oldicon) {
                oldicon.remove();
            }
            changeFavicon(num, this.updateFavicon)
            return this;
        },
        //添加计数器
        addTimer: function () {
            this.clearTimer();
            if (0 <= repeatableEffects.indexOf(this.effect)) {
                this.timer = setInterval(this.render.bind(this), this.interval);
            }
            return this;
        },
        //清除Icon
        faviconClear: function () {
            var newicon = document.getElementById('new' + this.updateFavicon.id),
                head = document.getElementsByTagName('head')[0],
                ficon = document.querySelectorAll('link[rel~=shortcut]');
            newicon && newicon.remove();
            if (ficon.length > 0) {
                for (var i = 0; i < ficon.length; i++) {
                    ficon[i].remove()
                }
            }
            head.appendChild(this.cloneFavicon);
            iconURL = this.cloneFavicon.href;
            this.favicon = this.cloneFavicon;
            return this;
        },
        //清除计数器
        clearTimer: function () {
            clearInterval(this.timer);
            document.title = this.title;
            return this;
        }
    };

    // 获取 favicon
    function getFavicon(setting) {
        var ic = document.querySelectorAll('link[rel~=shortcut]')[0];
        if (!ic) {
            ic = changeFavicon('O', setting);
        }
        return ic;
    }

    function createAudio(url) {
        var audioElm = document.createElement('audio'),
            source;
        if (isArray(url) && url.length > 0) {
            for (var i = 0; i < url.length; i++) {
                source = document.createElement('source');
                source.src = url[i];
                source.type = 'audio/' + getExtension(url[i]);
                audioElm.appendChild(source);
            }
        } else {
            audioElm.src = url;
        }
        return audioElm;
    }

    function isArray(value) {
        return Object.prototype.toString.call(value) === '[object Array]';
    }

    function changeFavicon(num, settings) {
        var canvas = document.createElement('canvas'),
            img = document.createElement('img'),
            head = document.getElementsByTagName('head')[0],
            linkTag = document.createElement('link'),
            ctx;

        canvas.height = canvas.width = 32;
        ctx = canvas.getContext('2d');
        ctx.fillStyle = settings.backgroundColor;
        ctx.fillRect(0, 0, 32, 32);

        ctx.textAlign = "center";
        ctx.font = '22px "helvetica", sans-serif';
        ctx.fillStyle = settings.textColor;
        ctx.fillText(num, 16, 24);

        //生成到
        linkTag.setAttribute('rel', 'shortcut icon');
        linkTag.setAttribute('type', 'image/x-icon');
        linkTag.setAttribute('id', 'new' + settings.id);
        linkTag.setAttribute('href', canvas.toDataURL('image/png'));
        iconURL = canvas.toDataURL('image/png');
        return head.appendChild(linkTag);
    };

    //获取文件后缀
    function getExtension(file_name) {
        return file_name.match(/\.([^\.]+)$/)[1];
    }

    function jsonArguments(news, olds) {
        for (var a in olds) {
            if (news[a]) {
                olds[a] = news[a]
            }
        }
        return olds
    }

    //提醒是否添加chrome通知
    if (window.Notification && window.Notification.permission !== "granted") {
        window.Notification.requestPermission();
    }
    return iNotify;
}));