using System;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;

namespace KidBit
{
	public class Program
	{
		//IO pins
		static InputPort fakeConnection = new InputPort(Pins.GPIO_PIN_D0, false, Port.ResistorMode.PullUp);
		static OutputPort alarmLed = new OutputPort(Pins.GPIO_PIN_D6, false);
		static OutputPort heartBeatLed = new OutputPort(Pins.ONBOARD_LED, false);
		static PWM piezo = new PWM(Pins.GPIO_PIN_D5);

		//variables
		static int i = 0;												//counter
		static int critical = 4;									//number of fails to trigger alarm
		static bool fc = false;
		static uint tone1 = 1000000 / 212;						//to adjust tone, only modify denominator
		static uint tone2 = 1000000 / 300;						//to adjust tone, only modify denominator

		public static void Main()
		{
			/* working on interrupt for LED and Piezo
			InterruptPort failure = new InterruptPort(fc, false, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeBoth);
			failure.OnInterrupt += failure_OnInterrupt;
			*/

			piezo.SetPulse(0, 0);									//Silence piezo at startup
			alarmLed.Write(false);									//turn off Alarm LED at startup
			heartBeatLed.Write(false);								//initialize Heart Beat LED

			while (true)												//While loop for entire program
			{
				heartBeatLed.Write(!heartBeatLed.Read());		//Heart Beat LED confirms program is running

				if (fakeConnection.Read() == true)				//true = within range, false = out of range
				{
					i = 0;												//remotely written overriding count below
				}

				i++;														//Increase counter by 1

				if (i > critical)										//if connection is broke, counter will go above 1, when counter hits value in critical, set alarm
				{
					while (i > critical)								//set alarm LED
					{
						alarmLed.Write(!alarmLed.Read());		//flash LED every loop (toggle LED state)
						piezo.SetPulse(tone1, tone1 / 2);		//set Piezo tone1 tone 1
						Thread.Sleep(100);							//sleep for 100 ms
						piezo.SetPulse(tone2, tone2 / 2);		//change piezo to tone 2

						if (fakeConnection.Read() == true)		//Check to see if we're still in an alarm state
						{
							i = 0;										//if out of alarm state, reset i
						}
						else
						{
							Thread.Sleep(100);						//Still in alarm state, thread sleep for another 100 ms for a total of 200 ms
						}
					}

					piezo.SetPulse(0, 0);							//out of alarm state, shut off piezo
					alarmLed.Write(false);							//out of alarm state, turn off LED
				}
				Thread.Sleep(200);									//main loop sleep for 200 ms
			}
		}
	}
}