/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2015 Intel Corporation.
 *
 * This program and the accompanying materials are made available under the
 * terms of the The MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 */


var sensorObj = require('jsupm_gprs');


/************** Functions **************/
function printUsage(progname)
{
    var outputStr = "Usage: " + progname + " [AT command]\n\n" +
	"If an argument is supplied on the command line, that argument is\n" +
	"sent to the module and the response is printed out.\n\n" +
	"If no argument is used, then the manufacturer and the current\n" +
	"saved profiles are queried and the results printed out.\n\n"
    console.log(outputStr);
}

// simple helper function to send a command and wait for a response
function sendCommand(sensor, cmd, callback)
{
    // commands need to be terminated with a carriage return
    cmd += "\r";
    sensor.writeDataStr(cmd);

    // wait up to 1 second
    if (sensor.dataAvailable(1000))
    {
	console.log("Returned: " + sensor.readDataStr(1024));
    }
    else
	console.log("Timed out waiting for response");

    if (callback)
	callback();
}

/************** Main code **************/
// Instantiate a GPRS Module on UART 0
var sensor = new sensorObj.GPRS(0);

// Set the baud rate, 19200 baud is the default.
if (sensor.setBaudRate(19200))
{
    console.log("Failed to set baud rate");
    process.exit(0);
}

printUsage(process.argv[1]);

// Note: in nodeJS, command-line argument 0 is "node".
// Command-line argument 1 is "gprs.js"
// If you have a third argument, then it's a command
if (process.argv.length > 2)
{
    console.log("Sending command line argument (" + process.argv[2] + ")...");
    sendCommand(sensor, process.argv[2]);
}
else
{
    // sending this command as a synchronous callback ensures better timing
    var callbackFunc = function()
    {
	setTimeout(function()
        {
            // query the saved profiles
            console.log("Querying the saved profiles (AT&V)...");
            sendCommand(sensor, "AT&V");
            
            // A comprehensive list is available from the
            // datasheet at:
            // http://www.seeedstudio.com/wiki/images/7/72/AT_Commands_v1.11.pdf
	}, 1000);
    };

    // query the module manufacturer
    console.log("Querying module manufacturer (AT+CGMI)...");
    sendCommand(sensor, "AT+CGMI", callbackFunc);
}


/************** Exit code **************/
process.on('SIGINT', function()
{
    sensor = null;
    sensorObj.cleanUp();
    sensorObj = null;
    console.log("Exiting...");
    process.exit(0);
});