/**
 * Copyright 2014 Antoine Aflalo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/


RED.settings = (function () {
    var hasLocalStorage = function () {
        try {
            return 'localStorage' in window && window['localStorage'] !== null;
        } catch (e) {
            return false;
        }
    };

    var set = function (key, value) {
        if (!hasLocalStorage()) {
            return;
        }
        localStorage.setItem(key, JSON.stringify(value));
    };
    /**
     * If the key is not set in the localStorage it returns <i>undefined</i>
     * Else return the JSON parsed value
     * @param key
     * @returns {*}
     */
    var get = function (key) {
        if (!hasLocalStorage()) {
            return undefined;
        }
        return JSON.parse(localStorage.getItem(key));
    };

    var remove = function (key) {
        if (!hasLocalStorage()) {
            return;
        }
        localStorage.removeItem(key);
    };

    var setProperties = function(data) {
        for(var prop in data) {
            if(data.hasOwnProperty(prop)) {
                RED.settings[prop] = data[prop];
            }
        }
    };

    var init = function (callback) {
        $.ajax({
            headers: {
                "Accept": "application/json"
            },
            dataType: "json",
            cache: false,
            url: 'settings',
            success: function (data) {
                setProperties(data);
                console.log("Node-RED: " + data.version);
                callback();
            }
        });
    };


    return {
        set: set,
        get: get,
        remove: remove,
        init : init
    }
})
();