/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:true */

/*
* Author: Zion Orent <zorent@ics.com>
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

var MOSFETsensor = require("jsupm_cjq4435");

var g_addnumBool = true;
var g_cycleNum = 0.0;
var g_cycleCount = 0;

// Instantiate a CJQ4435 MOSFET on a PWM capable digital pin D3
var myMOSFETsensor = new MOSFETsensor.CJQ4435(3);

myMOSFETsensor.setPeriodMS(10);
myMOSFETsensor.enable(true);

// A note on timing:
//	In the C++ example, the system sleeps 11 times for 100 milliseconds
//	between each duty cycle. After reaching the last point of the cycle,
//	the system sleeps again for 1 second.
//	The sleeps are cumulative, so the system has slept for 2.1 seconds
//	sum total for each cycle.
//	setInterval and setTimeout make asynchronous function calls;
//	they aren't cumulative.
//	In order to approximate the behavior of the C++ example, we need
//	to call each iteration 2.1 seconds apart instead of 1 second apart.

var myInterval = setInterval(function()
{
	setDutyCycle();
}, (1000 + (11*100)) );


// We start with a duty cycle of 0.0 (off) and increment to 1.0 (on)
// Then we take it back down,
// starting with a duty cycle of 1.0 (on) and decrement to 0.0 (off)
function setDutyCycle()
{
	myMOSFETsensor.setDutyCycle(g_cycleNum);
	if (g_addnumBool)
		g_cycleNum += 0.1;
	else
		g_cycleNum -= 0.1;
	g_cycleCount++;
	if (g_cycleCount > 10)
	{
		g_addnumBool = !g_addnumBool;
		g_cycleCount = 0;
	}
	else
		setTimeout(setDutyCycle, 100);
}


// When exiting: clear interval and print exit message
process.on('SIGINT', function()
{
	clearInterval(myInterval);
	myMOSFETsensor.off();
	console.log("Exiting...");
	process.exit(0);
});
