var COMMAND_REPORT = 0x01; //ϱ
var COMMAND_SET = 0x02; //

var ALINK_PROP_REPORT_METHOD = 'thing.event.property.post'; //׼ALink JSONʽtopic 豸ϴݵƶ
var ALINK_PROP_SET_METHOD = 'thing.service.property.set'; //׼ALink JSONʽtopic ƶ·Կָ豸
var ALINK_PROP_SET_REPLY_METHOD = 'thing.service.property.set'; //׼ALink JSONʽtopic, 豸ϱõĽƶ
/*
ʾݣ
豸ϱ
 ->
    0x010000006400
 ->
    {"method":"thing.event.property.post","id":"100","params":{"LightSwitch":0},"version":"1.0"}
*/
function rawDataToProtocol(bytes) {
    var uint8Array = new Uint8Array(bytes.length);
    for (var i = 0; i < bytes.length; i++) {
        uint8Array[i] = bytes[i] & 0xff;
    }
    var dataView = new DataView(uint8Array.buffer, 0);
    var jsonMap = new Object();
    var fHead = uint8Array[0]; // command
    if (fHead == COMMAND_REPORT) {
        jsonMap['method'] = ALINK_PROP_REPORT_METHOD; //ALink JSONʽ - ϱtopic
        jsonMap['version'] = '1.0'; //ALink JSONʽ - Э汾Ź̶ֶ
        jsonMap['id'] = '' + dataView.getInt32(1); //ALink JSONʽ - ʾôidֵ
        var params = {};
        params['LightSwitch'] = dataView.getInt8(5); //ӦƷ prop_int16
        jsonMap['params'] = params; //ALink JSONʽ - params׼ֶ
    }

    return jsonMap;
}
/*
ʾݣ

 ->
    {"method":"thing.service.property.set","id":"100","version":"1.0","params":{"LightSwitch":0}}
 ->
    0x020000006400
*/
function protocolToRawData(json) {
    var method = json['method'];
    var id = json['id'];
    var version = json['version'];
    var payloadArray = [];
    if (method == ALINK_PROP_SET_METHOD) // 
    {
        var params = json['params'];
        var light_switch = params['LightSwitch'];

        //ԶЭʽƴ rawData
        payloadArray = payloadArray.concat(buffer_uint8(COMMAND_SET)); // commandֶ
        payloadArray = payloadArray.concat(buffer_int32(parseInt(id))); // ALink JSONʽ 'id'
        payloadArray = payloadArray.concat(buffer_uint8(light_switch)); // 'light_switch'ֵ
    } 
    
    return payloadArray;
}

/**
 * 豸ԶtopicתΪjsonʽ, 豸ϱݵƽ̨ʱ
 * Σtopic   ַ豸ϱϢtopic     
 * ΣrawData byte[]                  Ϊ
 * ΣjsonObj                         Ϊ
 */
function transformPayload(topic, rawData) {
    jsonObj = {}
    return jsonObj
}

//ǲָ
function buffer_uint8(value) {
    var uint8Array = new Uint8Array(1);
    var dv = new DataView(uint8Array.buffer, 0);
    dv.setUint8(0, value);
    return [].slice.call(uint8Array);
}
function buffer_int16(value) {
    var uint8Array = new Uint8Array(2);
    var dv = new DataView(uint8Array.buffer, 0);
    dv.setInt16(0, value);
    return [].slice.call(uint8Array);
}
function buffer_int32(value) {
    var uint8Array = new Uint8Array(4);
    var dv = new DataView(uint8Array.buffer, 0);
    dv.setInt32(0, value);
    return [].slice.call(uint8Array);
}
function buffer_float32(value) {
    var uint8Array = new Uint8Array(4);
    var dv = new DataView(uint8Array.buffer, 0);
    dv.setFloat32(0, value);
    return [].slice.call(uint8Array);
}
