(function () {
    var URL_GET_SIP_ACCOUNT_PARAMS = '';
    var URL_MAKE_OUTCALL = "https://admin.graam.com/cors/api/callcenter/make_outcall";
        URL_GET_SIP_ACCOUNT_PARAMS = "https://admin.graam.com/ws-v2/d/lempire/cors/api/sip-account-params/[:email]";
    URL_MAKE_OUTCALL = "https://admin.graam.com/xapi/lempire/cors/api/callcenter/make_outcall";
    
    BASE_URL = "https://admin.graam.com";

    var self =
    {
        session_info: {
            state: { has_call: false }
        },
        start_listening: function () {
            window.addEventListener("message", function (event) {
                if (event.origin != BASE_URL) {
                    console.debug("Received message from unknown source ", event.origin);
                    return;
                }
                console.debug("received session data: ", event.data);
                self.session_info = event.data;
            });
        },
        get_session_info: function () {
            return self.session_info;
        },
        create_cors_request: function (method, url) {
            var xhr = new XMLHttpRequest();
            if ("withCredentials" in xhr) {

                // Check if the XMLHttpRequest object has a "withCredentials" property.
                // "withCredentials" only exists on XMLHTTPRequest2 objects.
                xhr.open(method, url, true);

            } else if (typeof XDomainRequest != "undefined") {

                // Otherwise, check if XDomainRequest.
                // XDomainRequest only exists in IE, and is IE's way of making CORS requests.
                xhr = new XDomainRequest();
                xhr.open(method, url);

            } else {

                // Otherwise, CORS is not supported by the browser.
                xhr = null;

            }
            return xhr;
        },
        make_call: function (called_number, calling_number, queue_id, queue_name, custom_data, success_cb, error_cb) {
            var xhr = self.create_cors_request('POST', URL_MAKE_OUTCALL);
            if (!xhr) {
                throw new Error('CORS not supported');
            }
            xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            xhr.withCredentials = true;
            var _onsuccess_cb = function (e) {
                if (e.target.status != 200) {
                    if (error_cb) {
                        var error_msg = "";
                        try {
                            error_msg = JSON.parse(e.target.responseText);
                            error_msg = error_msg.error.message;
                        }
                        catch (e) {
                            error_msg = e.target.responseText;
                        }
                        error_cb(e.target.status, error_msg);
                    }
                }
                else if (success_cb) {
                    success_cb(JSON.parse(e.target.responseText));
                }
            }
            var _onerror_cb = function (e) {
                error_cb(e.target.status, e.target.responseText);
            }
            xhr.onload = _onsuccess_cb;
            xhr.onerror = _onerror_cb;

            var data = '';
            data += 'called_number=' + encodeURIComponent(called_number);
            if (calling_number) {
                data += '&calling_number=' + encodeURIComponent(calling_number);
            }
            if (queue_id) {
                data += '&queue_id=' + encodeURIComponent(queue_id);
            }
            if (queue_name) {
                data += '&queue_name=' + encodeURIComponent(queue_name);
            }
            if (custom_data) {
                data += '&custom_data=' + encodeURIComponent(custom_data);
            }
            xhr.send(data);
        },
        /**
         * transferred_number:number Number to be transferred
         * assisted_transfer:boolean {0:blind transferred, 1:assisted tranfferred} 
         */
        transfer_call: function (transferred_number, assisted_transfer) {
            var m = JSON.stringify({ "function": "call_transfer", "number": transferred_number, "assisted": assisted_transfer });
            window.parent.postMessage(m, '*');
        },

        /**
         * app_name: Name of the application to which transfer the call
         * app_params:The parameters for the application
         */
        transfer_call_to_application: function (app_name, app_params) {
            var m = JSON.stringify({ function: "call_transfer", transfer_type: "application", app_name: app_name, app_params: app_params });
            window.parent.postMessage(m, '*');
        },

        /**
         * email: Email of the user to which get the sip params
         */
        get_sip_account_params: function (email, success_cb, error_cb) {
            if (!URL_GET_SIP_ACCOUNT_PARAMS) {
                throw new Error('CORS URL invlid');
            }

            // TODO check email
            var xhr = self.create_cors_request('GET', URL_GET_SIP_ACCOUNT_PARAMS.replace('[:email]', email));
            if (!xhr) {
                throw new Error('CORS not supported');
            }

            // xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            xhr.withCredentials = true;

            var _onsuccess_cb = function (e) {
                console.error('_onsuccess_cb', e);
                if (e.target.status != 200) {
                    if (error_cb) {
                        var error_msg = "";
                        // try {
                        //     error_msg = JSON.parse(e.target.responseText);
                        //     error_msg = error_msg.error.message;
                        // }
                        // catch (e) {
                        //     console.error('error_cb', e);
                        //     // error_msg = e.target.responseText;
                        // }
                        // error_cb(e.target.status, error_msg);
                    }
                }
                else if (success_cb) {
                    // success_cb(JSON.parse(e.target.responseText));
                }
            }
            var _onerror_cb = function (e) {
                console.error('_onerror_cb', e);
                // error_cb(e.target.status, e.target.responseText);
            }
            xhr.onload = _onsuccess_cb;
            xhr.onerror = _onerror_cb;

            xhr.send();
        }
    };
    self.start_listening();
    this.wePhoneCallCenter = self;
    return this.wePhoneCallCenter;

}).call(this);