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 led = new OutputPort(Pins.GPIO_PIN_D6, false);
        static OutputPort led1 = new OutputPort(Pins.ONBOARD_LED, false);
        static OutputPort led2 = new OutputPort(Pins.GPIO_PIN_D1, false);
        static PWM piezo1 = new PWM(Pins.GPIO_PIN_D5);

        //variables
        static int i = 0;               //counter
        static int critical = 4;        //number of fails to trigger alarm
        static uint tone = 1000000 / 212 ; //212 Hz is middle c
        static bool fC = false;


        public static void Main()
        {
            //Stop the piezo so it's not buzzing when the program starts
            piezo1.SetPulse(0, 0);
            led.Write(false);
            led1.Write(false);
            led2.Write(false);
            while (true)
            {
                led1.Write(!led1.Read());
                fC = fakeConnection.Read();
                led2.Write(fC);
                //If connection is good
                if (fC == 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
                {
                    piezo1.SetPulse(tone, tone/2);  //set alarm piezo
                    while (i > critical)            //set alarm led
                    {
                        led.Write(!led.Read());     //Toggle the LED by setting it to the opposite of its current state
                        
                        if (tone < 0)               //If loop to pulse tone
                        {
                            tone = 0;
                        }
                        else
                        {
                            tone = 1000000 / 212;
                        }

                        //Check to see if we're still in an alarm state
                        if (fC == true)
                        {
                            i = 0;
                        }
                        else
                        {
                            Thread.Sleep(200);
                        }
                    }

                    //The alarm has stopped
                    piezo1.SetPulse(0, 0);
                    led.Write(false);
                }
                Thread.Sleep(200);                  //loop sleep for 200 ms
            }
        }
    }
}