using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using SteamKit2;
using System.IO;
using System.Threading;
using OpenWeatherMap;
using System.Net;
using System.Xml;


namespace steamBot
{
    class Program
    {
        static string user, pass;
        static string authCode;

        static SteamClient steamClient;
        static CallbackManager manager;
        static SteamUser steamUser;
        static SteamFriends steamFriends;

        static bool isRunning = false;


        static void Main(string[] args)
        {
            if (!File.Exists("chat.txt"))
            {
                File.Create("chat.txt").Close();
                File.WriteAllText("chat.txt", "abc | 123");
            }
            Console.Title = "Steam Bot";

            Console.Write("Username: ");
            user = Console.ReadLine();

            Console.Write("Password: ");
            pass = Console.ReadLine();

            SteamLogIn();
        }

        static void SteamLogIn()
        {
            steamClient = new SteamClient();
            manager = new CallbackManager(steamClient);
            steamUser = steamClient.GetHandler<SteamUser>();
            steamFriends = steamClient.GetHandler<SteamFriends>();
            manager.Subscribe<SteamClient.ConnectedCallback>(OnConnected);
            manager.Subscribe<SteamClient.DisconnectedCallback>(OnDisconnected);
            manager.Subscribe<SteamUser.LoggedOnCallback>(OnLoggedOn);
            manager.Subscribe<SteamUser.UpdateMachineAuthCallback>(UpdateAuthMachineCallback);
            manager.Subscribe<SteamUser.AccountInfoCallback>(OnAccountInfo);
            manager.Subscribe<SteamFriends.FriendMsgCallback>(OnChatMessage);
            manager.Subscribe<SteamFriends.FriendsListCallback>(OnFriendsList);


            isRunning = true;

            Console.WriteLine("\nConnecting to Steam..\n");

            steamClient.Connect();

            while (isRunning)
            {
                manager.RunWaitCallbacks(TimeSpan.FromSeconds(1));
            }

        }

        static void OnConnected(SteamClient.ConnectedCallback callback)
        {
            Console.WriteLine("Connected to steam server \nLogging in user: {0}", user);
            byte[] sentryHash = null;
            if (File.Exists("sentry.bin"))
            {
                byte[] sentryfile = File.ReadAllBytes("sentry.bin");

                sentryHash = CryptoHelper.SHAHash(sentryfile);


            }
            steamUser.LogOn(new SteamUser.LogOnDetails
            {
                Username = user,
                Password = pass,

                AuthCode = authCode,

                SentryFileHash = sentryHash

            });
        }

        static void OnLoggedOn(SteamUser.LoggedOnCallback callback)
        {
            if (callback.Result == EResult.AccountLogonDenied)
            {
                Console.WriteLine("This account is Steam Guard protected");
                Console.WriteLine("Please enter the code sent to your email at {0}: ", callback.EmailDomain);
                authCode = Console.ReadLine();
                return;
            }
            if (callback.Result != EResult.OK)
            {
                Console.WriteLine("Unable to log in to Steam: {0}\n", callback.Result);
                isRunning = false;
                return;
            }
            Console.Clear();
            Console.WriteLine("Sucessfully logged in as : {0}", user);
        }

        static void UpdateAuthMachineCallback(SteamUser.UpdateMachineAuthCallback callback)
        {
            Console.WriteLine("Updating sentry file..");

            byte[] sentryHash = CryptoHelper.SHAHash(callback.Data);

            File.WriteAllBytes("sentry.bin", callback.Data);

            steamUser.SendMachineAuthResponse(new SteamUser.MachineAuthDetails
            {
                JobID = callback.JobID,
                FileName = callback.FileName,
                BytesWritten = callback.BytesToWrite,
                FileSize = callback.Data.Length,
                Offset = callback.Offset,
                Result = EResult.OK,
                LastError = 0,
                OneTimePassword = callback.OneTimePassword,
                SentryFileHash = sentryHash,
            });
            Console.WriteLine("Done!");
        }

        static void OnDisconnected(SteamClient.DisconnectedCallback callback)
        {
            Console.WriteLine("\n {0} Disconnected from steam servers , reconnecting in 5...\n", user);
            Thread.Sleep(5000);
            steamClient.Connect();
            Console.Clear();
        }

        static void OnAccountInfo(SteamUser.AccountInfoCallback callback)
        {
            steamFriends.SetPersonaState(EPersonaState.Online);
        }

        static void OnFriendsList(SteamFriends.FriendsListCallback callback)
        {
            Thread.Sleep(2500);

            foreach(var friend in callback.FriendList)
            {
                if (friend.Relationship == EFriendRelationship.RequestRecipient)
                {
                    Console.WriteLine("FriendRequests: " + steamFriends.GetFriendPersonaName(friend.SteamID) + " sent a friend request. Accepting..");
                    steamFriends.AddFriend(friend.SteamID);
                    Thread.Sleep(500);
                    steamFriends.SendChatMessage(friend.SteamID, EChatEntryType.ChatMsg, "Hello I am a bot, for help type !commands");
                }
            }
        }

        static void OnChatMessage(SteamFriends.FriendMsgCallback callback)
        {
            string[] args;
            if (callback.EntryType == EChatEntryType.ChatMsg)
            {
                if (callback.Message.Length > 1)
                {
                    if(callback.Message.Remove(1) == "!")
                    {
                        string command = callback.Message;
                        if (callback.Message.Contains(" "))
                        {
                            command = callback.Message.Remove(callback.Message.IndexOf(' '));
                        }

                        switch(command)
                        {
                            #region send
                            case "!send":
                                args = separate(2, ' ', callback.Message);
                                Console.WriteLine("!send " + args[1] + args[2] + " command recieved. User: " + steamFriends.GetFriendPersonaName(callback.Sender));
                                if (args[0] == "-1")
                                {
                                    steamFriends.SendChatMessage(callback.Sender, EChatEntryType.ChatMsg, "Syntax: !send [friend] [message]");
                                    return;
                                }
                                for (int i = 0; i < steamFriends.GetFriendCount(); i++)
                                {
                                    SteamID friend = steamFriends.GetFriendByIndex(i);
                                    if (steamFriends.GetFriendPersonaName(friend).ToLower().Contains(args[1].ToLower()))
                                    {
                                        steamFriends.SendChatMessage(friend, EChatEntryType.ChatMsg, args[2]);
                                    }
                                }
                                break;
                            #endregion
                            #region friends
                            case "!friends":
                                Console.WriteLine("!friends command recieved. User: " + steamFriends.GetFriendPersonaName(callback.Sender));
                                for(int i = 0; i < steamFriends.GetFriendCount(); i++)
                                {
                                    SteamID friend = steamFriends.GetFriendByIndex(i);
                                    steamFriends.SendChatMessage(callback.Sender, EChatEntryType.ChatMsg, "Friend: " + steamFriends.GetFriendPersonaName(friend) + " - State: " + steamFriends.GetFriendPersonaState(friend));
                                }
                                break;
                            #endregion
                            #region commands
                            case "!commands":
                                Console.WriteLine("!commands command recieved. User: " + steamFriends.GetFriendPersonaName(callback.Sender));
                                steamFriends.SendChatMessage(callback.Sender, EChatEntryType.ChatMsg, "Available commands: !send; !friends");
                                break;
                            #endregion
                        }
                    }
                }
                string rLine;
                string trimmed = callback.Message;
                char[] trim = { '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '-', '_', '=', '+', '[', ']', '{', '}', '\\', '|', ';', ':', '"', '\'', ',', '<', '.', '>', '/', '?' };

                for (int i = 0; i < 30; i++)
                {
                    trimmed = trimmed.Replace(trim[i].ToString(), "");
                }
                 StreamReader sReader = new StreamReader("chat.txt");

            while ((rLine = sReader.ReadLine()) != null)
            {
                    string text = rLine.Remove(rLine.IndexOf('|') - 1);
                    string response = rLine.Remove(0, rLine.IndexOf('|') + 2);

                    if (callback.Message.ToLower().Contains(text))
                    {
                        Console.WriteLine("Message: " + steamFriends.GetFriendPersonaName(callback.Sender) + ": " + callback.Message);
                        steamFriends.SendChatMessage(callback.Sender, EChatEntryType.ChatMsg, response);
                        sReader.Close();
                        return;
                    }
            }

        }
        }

        public static string[] separate(int number,char separator, string thestring)
#pragma warning restore IDE1006 // Naming Styles
        {
            string[] returned = new string[4];

            int i = 0;

            int error = 0;

            int lenght = thestring.Length;

            foreach(char c in thestring)
            {
                if (i != number)
                {
                    if (error > lenght || number > 5)
                    {
                        returned[0] = "-1";
                        return returned;
                    }
                    else if (c == separator)
                    {
                        returned[i] = thestring.Remove(thestring.IndexOf(c));
                        thestring = thestring.Remove(0, thestring.IndexOf(c) + 1);
                        i++;
                    }
                    error++;

                    if (error == lenght && i != number)
                    {
                        returned[0] = "-1";
                        return returned;
                    }
                }
                else
                {
                    returned[i] = thestring;
                }
            }
            return returned;
        }
    }
}