using System.Net.NetworkInformation;
using System.Text;
using System;
using System.IO;
using PiSharp.LibGpio;
using PiSharp.LibGpio.Entities;
using System.Timers;

namespace RaspPi_Control
{
    class Program
    {
        public static StreamWriter filer;
        public static bool pinState = PinSetup();
        public static int tickCount = 0;
        public static string filePath = "~/Logs/pilog.log";
        public static string fileDirectory = "~/Logs/";
        static void Main(string[] args)
        {
            Console.Title = "Automatic Modem Reset - DO NOT CLOSE (C) Brychan Dempsey";
            Console.WriteLine("Beginning application...");
            Console.WriteLine("Renaming Old Logs...");
            changeLogs();
            System.Timers.Timer aTimer = new System.Timers.Timer();
            aTimer.Elapsed += new ElapsedEventHandler(timerFunction);
            aTimer.Interval = 60000;
            aTimer.Enabled = true;
            Console.WriteLine("Timer Started, value is " + aTimer.Enabled.ToString());
            Console.WriteLine("Waiting on keypress to end application");
            Console.ReadKey();
        }
        static void timerFunction(object source, ElapsedEventArgs timeargs)
        {
            tickCount++;
            if(tickCount > 86399) // Do not keep adding to a log for more than a day
            {
                changeLogs();
            }
            Console.WriteLine("Timer has ticked!");
            doCheck();
        }
        static void changeLogs()
        {
            string mainLog = "pilog.log";
            string twoLog = "pilog2.log";
            string threeLog = "pilog3.log";
            string fourLog = "pilog4.log";
            Console.WriteLine("Changing Logs...");
            if (File.Exists(fileDirectory + fourLog))
            {
                Console.WriteLine("Deleting 4th log...");
                File.Delete(fileDirectory + fourLog);
            }
            if (File.Exists(fileDirectory + threeLog))
            {
                Console.WriteLine("3rd > 4th log...");
                File.Move(fileDirectory + threeLog, fileDirectory + fourLog);
                File.Delete(fileDirectory + threeLog);
            }
            if (File.Exists(fileDirectory + twoLog))
            {
                Console.WriteLine("2nd > 3rd log...");
                File.Move(fileDirectory + twoLog, fileDirectory + threeLog);
                File.Delete(fileDirectory + twoLog);
            }
            if (File.Exists(fileDirectory + mainLog))
            {
                Console.WriteLine("1st > 2nd log...");
                File.Move(fileDirectory + mainLog, fileDirectory + twoLog);
                File.Delete(fileDirectory + mainLog);
            }
            else
            {
                Console.WriteLine("Main log did not exist, continuing..");
            }
        }
        static void doCheck()
        {
            // Prepare Log Writing
            Directory.CreateDirectory(fileDirectory);
            Console.WriteLine("Directory Created.");
            filer = File.AppendText(filePath);
            Console.WriteLine("Beginning Log.");
            WriteLog("NEW INSTANCE: " + DateTime.UtcNow + " ");
            WriteLog("--------------------------------");
            Console.WriteLine("Beginning IP Ping.");
            // Begin ipCheck
            string ipAddress = "192.168.1.1";
            string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
            byte[] buffer = Encoding.ASCII.GetBytes(data);
            int timeout = 120;
            Ping controlPing = new Ping();
            PingOptions options = new PingOptions();
            bool success = false;
            PingReply reply;
            try
            {
                reply = controlPing.Send(ipAddress, timeout, buffer, options);
                if (reply.Status == IPStatus.Success)
                {
                    success = true;
                }
            }
            catch (Exception e)
            {
                WriteLog("Error: " + e.ToString());
                success = false;
            }
            finally
            {
                if (success)
                {
                    Console.WriteLine("Ping successfull");
                    if(!pinState)
                    {
                        LibGpio.Gpio.OutputValue(BroadcomPinNumber.Four, true);
                        pinState = true;
                    }
                    WriteLog("Ping successfull", true);
                    System.Threading.Thread.Sleep(1000);
                }
                else
                {
                    WriteLog("Ping was not successfull: " + DateTime.UtcNow);
                    if (pinState)
                    {
                        LibGpio.Gpio.OutputValue(BroadcomPinNumber.Four, false);
                        pinState = false;
                        System.Threading.Thread.Sleep(1000);
                        LibGpio.Gpio.OutputValue(BroadcomPinNumber.Four, true);
                        pinState = true;
                    }
                    else
                    {
                        LibGpio.Gpio.OutputValue(BroadcomPinNumber.Four, true);
                        pinState = true;
                    }
                    System.Threading.Thread.Sleep(1000);
                    WriteLog("Rebooting", true);
                }
            }
            return;
        }
        static bool PinSetup()
        {
            LibGpio.Gpio.TestMode = false;
            LibGpio.Gpio.SetupChannel(BroadcomPinNumber.Four, Direction.Output);
            LibGpio.Gpio.OutputValue(BroadcomPinNumber.Four, true);
            return true;
        }

        /// <summary>
        /// Opens the existing StreamWriter and appends the provided string to the text file
        /// </summary>
        /// <param name="arg">The string to append</param>
        /// <param name="close">Flag signifying the last object to be written. Disposes the StreamWriter</param>
        /// <param name="console">Displays output to the console</param>
        static void WriteLog(string arg, bool close=false, bool console=true)
        {
            filer.WriteLine(arg);
            if(console)
            {
                Console.WriteLine("Appending " + arg + " to log file...");
            }
            if (close)
            {
                filer.Dispose();
            }
        }
        /// <summary>
        /// Automatically closes the open file write and checks the dates of the first entry.
        /// Deletes the file if older than 7 days
        /// </summary>
        /// <param name="filePath">The path to the log file</param>
        //static void ClearLog( string filePath)
        //{
        //    char[] readChar = new char[100];
            
        //    StreamReader sr = new StreamReader(filePath);
        //    try
        //    {
        //        Console.WriteLine("Reading stream from path");
        //        sr.ReadBlock(readChar, 0, 100);
        //    }
        //    catch (Exception e)
        //    {
        //        Console.WriteLine("Encountered an error {0} in checking the file: {1}",e,filePath);
        //        return;
        //    }
        //    finally
        //    {
        //        Console.WriteLine("Success!");
        //        try
        //        {
        //            sr.Dispose();
        //        }
        //        catch (NullReferenceException)
        //        {
        //            Console.WriteLine("File Stream already closed");
        //        }
        //        Console.WriteLine("Successfully read {0}",filePath);
        //        string finalString = new string(readChar);
        //        int dateIndex = finalString.IndexOf("NEW INSTANCE:") + 14;
        //        finalString = finalString.Remove(0, dateIndex);
        //        dateIndex = finalString.IndexOf(" ");
        //        finalString = finalString.Remove(dateIndex, finalString.Length - dateIndex);
        //        DateTime dateTime;
        //        DateTime.TryParse(finalString, out dateTime);
        //        TimeSpan dayDiff = DateTime.UtcNow - dateTime;
        //        if(dayDiff.Days >= 7)
        //        {
        //            Console.WriteLine("File is older than 7 days, deleting");
        //            File.Delete(filePath);
        //        }
        //    }
            
        //}
    }
}