/*
 * Copyright 2010-2011 Research In Motion Limited.
 *
 * 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.
 */

    var _clientListeners = {},
        _webkitBattery = navigator.webkitBattery || navigator.battery;

module.exports = {
    start: function (success, fail, args, env) {
        var result = new PluginResult(args, env),
            listener = function (info) {
                var resultInfo = {};
                if (info) {
                    if (info.srcElement) {
                        //webkitBattery listeners store webkitBattery in srcElement object
                        info = info.srcElement;
                    }

                    //put data from webkitBattery into a format cordova expects
                    //webkitBattery seems to return level as a decimal pre 10.2
                    resultInfo.level = info.level <= 1 ? info.level * 100 : info.level,
                    resultInfo.isPlugged = info.charging
                }

                result.callbackOk(resultInfo, true);
            };

        if (_clientListeners[env.webview.id]) {
            //TODO: Change back to erroring out after reset is implemented
            //result.error("Battery listener already running");
            _webkitBattery.onchargingchange = null;
            _webkitBattery.onlevelchange = null;
        }

        _clientListeners[env.webview.id] = listener;

        _webkitBattery.onchargingchange = listener;
        _webkitBattery.onlevelchange = listener;

        setTimeout(function(){
            //Call callback with webkitBattery data right away
            listener(_webkitBattery);
        });

        result.noResult(true);
    },
    stop: function (success, fail, args, env) {
        var result = new PluginResult(args, env),
            listener = _clientListeners[env.webview.id];

        if (!listener) {
            result.error("Battery listener has not started");
        } else {
            _webkitBattery.onchargingchange = null;
            _webkitBattery.onlevelchange = null;
            delete _clientListeners[env.webview.id];
            result.noResult(false);
        }
    }
};
