module.exports = async function (context, req) {
    data = JSON.parse(req.body.Data)
    device = {
        deviceId: data.Packets[0].TerminalId
    }
    measurements = unpack_tracker(data.Packets[0].Value)

    try {
        await handleMessage({ ...parameters, log: context.log, getSecret: getKeyVaultSecret }, device, measurements, req.body.timestamp);
    } catch (e) {
        context.log('[ERROR]', e.message);

        context.res = {
            status: e.statusCode ? e.statusCode : 500,
            body: e.message
        };
    }
}

/**
 * Unpacks a message from the tracker app into a format that can be used by IoT Central
 */
function unpack_tracker(packet) {
    const data = Buffer.from(packet, "hex")


    return {
        DeviceType: "Myriota Tracker",
        SequenceNumber: data.readUInt16LE(0),
        Tracking: {
            lat: data.readInt32LE(2)/1e7,
            lon: data.readInt32LE(6)/1e7
        },
        GNSSFixTimestamp: data.readUInt32LE(10)*1000,
    }
}