(function (root) {
	SYNO = root.SYNO || {};
	STRINGS = {};

	SYNO.Request = function(method, url, data) {
		return new Promise(function (resolve, reject) {
			var xhr = new XMLHttpRequest();
			xhr.open(method, url);
			xhr.onload = function () {
				if (this.status >= 200 && this.status < 300) {
					resolve(xhr.response);
				} else {
					reject({
						status: this.status,
						statusText: xhr.statusText
					});
				}
			};
			xhr.onerror = function () {
				reject({
					status: this.status,
					statusText: xhr.statusText
				});
			};

			if (data && data !== "") {
				xhr.send(data);
			} else {
				xhr.send();
			}
		});
	};

	SYNO.EscapeKeys = ["ds_id", "auth", "p256dh", "public_key", "browser_key"];

	SYNO.UrlEncode = function(params, is_escaped) {
		var data = "";
		var escaped = (typeof is_escaped !== "boolean") ? true : is_escaped;
		if (params) {
			for (key in params) {
				data = data + ((data === "") ? "" : "&");
				if ((typeof params[key] === "string") && escaped && (SYNO.EscapeKeys.indexOf(key) >= 0)) {
					data = data + encodeURIComponent(key) + "=\"" + encodeURIComponent(params[key]) + "\"";
				} else {
					data = data + encodeURIComponent(key) + "=" + encodeURIComponent(params[key]);
				}
			}
		}

		return data;
	};

	SYNO.APIRequest = function(api, method, version, params, is_escaped) {
		var escaped = (typeof is_escaped !== "boolean") ? true : is_escaped;
		var pathname = window.location.pathname.replace("/webman/3rdparty/SynologyApplicationService/browser_pair/pair.html", "/webapi/entry.cgi");
		var url = window.location.origin + pathname;
		var urlParams = Object.assign(params, {
			"api" : api,
			"method" : method,
			"version" : version
		});

		return new Promise(function (resolve, reject) {
			SYNO.Request("POST", url, SYNO.UrlEncode(urlParams, escaped))
			.then(function(response){
				try {
					var res = JSON.parse(response);
					resolve(res);
				} catch(e) {
					reject({'success': false, 'error': 'network'});
				}
			})['catch'](function(error){
				reject({'success': false, 'error': 'network'});
			});
		});
	};

	SYNO.GetStrings = function(lang) {
		return SYNO.Request("GET", "../texts/" + lang + "/strings")
			.then(function(response) {
				var lines = response.match(/[^\r\n]+/g);
				var curSection;

				lines.forEach(function(line) {
					if (line[0] == '#') {
						return;
					}

					// find [SECTION]
					var section = line.match(/\[(.*?)\]/);
					if (section !== null && section.length == 2) {
						curSection = section[1];
						STRINGS[curSection] = {};
						return;
					}

					// find KEY = "VALUE"
					var pair = line.match(/\s*(.*?)\s*=\s*"(.*)"\s*/);
					if (pair !== null && pair.length == 3) {
						STRINGS[curSection][pair[1]] = pair[2];
					}
				});
			});
	};

	SYNO.GetDSIDRequest = function(params) {
		return SYNO.APIRequest("SYNO.Personal.Notification.Identifier", "get", "1", params);
	};

	SYNO.GetTokenRequest = function(params) {
		return SYNO.APIRequest("SYNO.Personal.Notification.Token", "get", "1", params);
	};

	SYNO.SendPairRequest = function(params) {
		return SYNO.APIRequest("SYNO.Personal.Notification.Mobile", "pair", "1", params);
	};

	SYNO.GetVapidPKeyRequest = function(params) {
		return SYNO.APIRequest("SYNO.Personal.Notification.VapidPublicKey", "get", "1", params);
	};

	SYNO.SendEncryptStatusRequest = function(params) {
		return SYNO.APIRequest("SYNO.SAS.Encryption", "status", "1", params);
	};

	SYNO.SendEncryptExchangeRequest = function(params) {
		return SYNO.APIRequest("SYNO.SAS.Encryption", "exchange", "1", params);
	};

	SYNO.GetGDPRSettingRequest = function(params) {
		return SYNO.APIRequest("SYNO.Personal.Notification.GDPR", "get", "1", params);
	};

	SYNO.SetGDPRSettingRequest = function(params) {
		return SYNO.APIRequest("SYNO.Personal.Notification.GDPR", "set", "1", params);
	};

	if (typeof module !== 'undefined' && module.exports) {
        module.exports = SYNO;
    } else if (!root.SYNO) {
        root.SYNO = SYNO;
    }
})(this);