using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.Devices.Enumeration;
using Windows.Devices.I2c;
using System.Diagnostics;
using System.Threading;
using WinRTXamlToolkit.Controls;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace ArduinoSharpIR
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {

        private I2cDevice Device;
        private Timer periodicTimer;
        private int sampleFrequency = 500; //0.5 Sec
        private int sampleNumber = 1;

        public MainPage()
        {
            this.InitializeComponent();
            SetupI2C();
        }

        private async void SetupI2C()
        {
            var settings = new I2cConnectionSettings(0x40);// arduino address
            settings.BusSpeed = I2cBusSpeed.StandardMode;
            string aqs = I2cDevice.GetDeviceSelector("I2C1");
            var dis = await DeviceInformation.FindAllAsync(aqs);
            Device = await I2cDevice.FromIdAsync(dis[0].Id, settings);
            // start timer
            periodicTimer = new Timer(this.TimerGetAndDisplay, null, 0, sampleFrequency);
        }
        public void TimerGetAndDisplay(object state)
        {
            byte[] RegAddrBuf = new byte[] { 0x40 };
            byte[] ReadBuf = new byte[9];
            try
            {
                Device.Read(ReadBuf);
            }
            catch (Exception f)
            {
                Debug.WriteLine(f.Message);

            }
            //Decodes a sequence of bytes from the specified byte array into string
            //GetString: First parameter is the byte array
            //           Second parameter is the index of the byte to decode
            //           Third parameter is the number of bytes to decode

            char[] Distance_Array = System.Text.Encoding.UTF8.GetString(ReadBuf, 0, 4).ToCharArray();// distance
            char[] ADC_Array = System.Text.Encoding.UTF8.GetString(ReadBuf, 4, 5).ToCharArray();// ADC

            //convert the character array into string.
            String c = new string(Distance_Array);
            String a = new string(ADC_Array);

            string distance = c.Substring(0, 4);
            string ADC = a.Substring(0, 4); // start with specific location and specific length

            Debug.WriteLine("Sample: " + sampleNumber + " Distance " + distance + " cm");
            Debug.WriteLine("ADC: " + ADC);

            sampleNumber++;

            var task = this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
            {
                ADCGauge.Value = Convert.ToDouble(ADC); //sending the ADC value to the designer to display
                Distance.Value = Convert.ToDouble(distance); //sending the distance value to the designer for display
            });
        }
    }
}