var bleno = require('bleno');
var serviceUuids = ['fffffffffffffffffffffffffffffff0']
function Utf8ArrayToStr(array) {
    var out, i, len, c;
    var char2, char3;
    out = "";
    len = array.length;
    i = 0;
    while(i < len) {
        c = array[i++];
        switch(c >> 4)
        {
            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
            out += String.fromCharCode(c);
            break;
            case 12: case 13:
// 110x xxxx 10xx xxxx
            char2 = array[i++];
            out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
            break;
            case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
                char2 = array[i++];
                char3 = array[i++];
                out += String.fromCharCode(((c & 0x0F) << 12) |
                    ((char2 & 0x3F) << 6) |
                    ((char3 & 0x3F) << 0));
                break;
        }
    }
    return out;
}
var ioNew = null
try {
    bleno.on('stateChange', function(state) {
        console.log('on -> stateChange: ' + state);
        if (state === 'poweredOn') {
            bleno.startAdvertising('semsx', serviceUuids);
        } else {
            bleno.stopAdvertising();
        }
    });
    bleno.on('advertisingStart', function(error) {
        console.log('on -> advertisingStart: ' + (error ? 'error ' + error : 'success'));
        if (!error) {
            io.sockets.emit('blueConnect', 'success');
            console.log('start');
            var Descriptor = bleno.Descriptor;
            var descriptor = new Descriptor({
                uuid: '212112',
                value: '123123' // static value, must be of type Buffer or string if set
            });
            var Characteristic = bleno.Characteristic;
            var characteristic = new Characteristic({
                uuid: 'fffffffffffffffffffffffffffffff1', // or 'fff1' for 16-bit
                properties: ['read', 'write','notify','writeWithoutResponse'], // can be a combination of 'read', 'write', 'writeWithoutResponse', 'notify', 'indicate'
                value: null, // optional static value, must be of type Buffer - for read only characteristics
                descriptors: [
                    // see Descriptor for data type
                    descriptor
                ],
                onWriteRequest: function (data, offset, withoutResponse,callBack) {
                    var obj = JSON.parse( Utf8ArrayToStr(new Uint8Array(data)))
                    //console.log(withoutResponse)
                    callBack()
                },
                onReadRequest: function (offset, callBack) {
                    var result = characteristic.RESULT_SUCCESS;
                    //var data = new Buffer('321');
                    sendMessageHandle = callBack
                }

            });
            messageObj = characteristic
            var PrimaryService = bleno.PrimaryService;
            var primaryService = new PrimaryService({
                uuid: 'fffffffffffffffffffffffffffffff0', // or 'fff0' for 16-bit
                characteristics: [
                    // see Characteristic for data type
                    characteristic
                ]
            });
            bleno.setServices(primaryService, function (error) {
                if (error) {
                    console.log(error);
                }
                console.log('success');
            });
        } else {
        }
    });

    bleno.on('disconnect',function (clientAddress) {
        console.log('disconnectAddress')
    })
    bleno.on('accept',function (clientAddress) {
        console.log('connectAddress')
    })
    bleno.on('advertisingStartError', function(error) {
        console.log(error)
    });
}catch (err){
    // 判断用户是否开启蓝牙 或者是堵塞
    if(err.message == 'No compatible USB Bluetooth 4.0 device found!') {
        // 没有插设备
    }

    console.log(err.message)
}
var sendMessageHandle = null
var messageObj = null

module.exports = {
    sendData:function (buffer) {
        if(sendMessageHandle) {
            var result =messageObj.RESULT_SUCCESS;
            var data = new Buffer('woshi zhangxiaoyu');
            sendMessageHandle(result,data)
        }
    },
    setIo:function (data) {
        ioNew  = data
    }

}