(function(window, document) {
    var logLevels = ["debug", "trace", "log", "info", "warn", "error"];
    // 每次log记录成功后需要重置的属性
    var publicProps = ["message", "level", "params"];
    function createHttpRequest() {
        if (window.ActiveXObject) {
            return new ActiveXObject("Microsoft.XMLHTTP");
        } else if (window.XMLHttpRequest) {
            return new XMLHttpRequest();
        }
    }
    function AliLogTracker(host, project, logstore) {
        this.uri_ = "https://" + project + "." + host + "/logstores/" + logstore + "/track?APIVersion=0.6.0";
        this.params_ = {
            params: {},
            level: "",
            message: '',
        };
        this.httpRequest_ = createHttpRequest();
    }
    AliLogTracker.prototype = {
        /**
         * 新增键值对到 params 中
         * @param {object} params
         */
        setContext: function(params) {
            if (!!params && params instanceof Object) {
                this.params_.params = this.params_.params || {};
                Object.assign(this.params_.params, params);
            }
        },
        /**
         * 新增全局键值对
         * @param {string} key
         * @param {any} value
         */
        setGlobalContext: function(key, value) {
            this.params_[key] = value;
        },
        logger: function() {
            this.params_ = this.params_ || {};
            var params = {...this.params_};
            if (params.params && params.params instanceof Object && Object.values(params.params).length) {
                params.params = JSON.stringify(params.params);
            } else {
                delete params.params;
            }
            var url = this.uri_;
            var queryString = new URLSearchParams(params).toString();
            if (queryString) {
                url += "&" + queryString;
                try {
                    this.httpRequest_.open("GET", url, true);
                    this.httpRequest_.send(null);
                    publicProps.map(prop => {
                        delete this.params_[prop];
                    });
                } catch (ex) {
                    if (window && window.console && typeof window.console.log === "function") {
                        console.log("Failed to log to ali log service because of this exception:\n" + ex);
                        console.log("Failed log data:", url);
                    }
                }
            }
        }
    };
    logLevels.map(level => {
        AliLogTracker.prototype[level] = function(message, params) {
            this.params_.message = message;
            this.params_.level = level;
            this.params_.url = window.location.href;
            this.setContext(params);
            this.logger();
        };
    });

    window.Tracker = AliLogTracker;
})(window, document);