using System.Collections.Generic;
using Server.Accounting;

namespace Server.Engines.Chat
{
  public class ChatUser
  {
    public const char NormalColorCharacter = '0';
    public const char ModeratorColorCharacter = '1';
    public const char VoicedColorCharacter = '2';

    private static readonly List<ChatUser> m_Users = new List<ChatUser>();
    private static readonly Dictionary<Mobile, ChatUser> m_Table = new Dictionary<Mobile, ChatUser>();

    public ChatUser(Mobile m)
    {
      Mobile = m;
      Ignored = new List<ChatUser>();
      Ignoring = new List<ChatUser>();
    }

    public Mobile Mobile { get; }

    public List<ChatUser> Ignored { get; }

    public List<ChatUser> Ignoring { get; }

    public string Username
    {
      get
      {
        if (Mobile.Account is Account acct)
          return acct.GetTag("ChatName");

        return null;
      }
      set
      {
        if (Mobile.Account is Account acct)
          acct.SetTag("ChatName", value);
      }
    }

    public Channel CurrentChannel { get; set; }

    public bool IsOnline => Mobile.NetState != null;

    public bool Anonymous { get; set; }

    public bool IgnorePrivateMessage { get; set; }

    public bool IsModerator => CurrentChannel?.IsModerator(this) == true;

    public char GetColorCharacter() =>
      IsModerator ? ModeratorColorCharacter :
      CurrentChannel?.IsVoiced(this) == true ? VoicedColorCharacter : NormalColorCharacter;

    public bool CheckOnline()
    {
      if (IsOnline)
        return true;

      RemoveChatUser(this);
      return false;
    }

    public void SendMessage(int number, string param1 = null, string param2 = null)
    {
      if (Mobile.NetState != null)
        Mobile.Send(new ChatMessagePacket(Mobile, number, param1, param2));
    }

    public void SendMessage(int number, Mobile from, string param1, string param2)
    {
      if (Mobile.NetState != null)
        Mobile.Send(new ChatMessagePacket(from, number, param1, param2));
    }

    public bool IsIgnored(ChatUser check) => Ignored.Contains(check);

    public void AddIgnored(ChatUser user)
    {
      if (IsIgnored(user))
      {
        SendMessage(22, user.Username); // You are already ignoring %1.
      }
      else
      {
        Ignored.Add(user);
        user.Ignoring.Add(this);

        SendMessage(23, user.Username); // You are now ignoring %1.
      }
    }

    public void RemoveIgnored(ChatUser user)
    {
      if (IsIgnored(user))
      {
        Ignored.Remove(user);
        user.Ignoring.Remove(this);

        SendMessage(24, user.Username); // You are no longer ignoring %1.

        if (Ignored.Count == 0)
          SendMessage(26); // You are no longer ignoring anyone.
      }
      else
      {
        SendMessage(25, user.Username); // You are not ignoring %1.
      }
    }

    public static ChatUser AddChatUser(Mobile from)
    {
      ChatUser user = GetChatUser(from);

      if (user != null)
        return user;

      user = new ChatUser(from);

      m_Users.Add(user);
      m_Table[from] = user;

      Channel.SendChannelsTo(user);

      List<Channel> list = Channel.Channels;

      for (int i = 0; i < list.Count; ++i)
      {
        Channel c = list[i];

        if (c.AddUser(user))
          break;
      }

      // ChatSystem.SendCommandTo( user.m_Mobile, ChatCommand.AddUserToChannel, user.GetColorCharacter() + user.Username );

      return user;
    }

    public static void RemoveChatUser(ChatUser user)
    {
      if (user == null)
        return;

      for (int i = 0; i < user.Ignoring.Count; ++i)
        user.Ignoring[i].RemoveIgnored(user);

      if (m_Users.Contains(user))
      {
        ChatSystem.SendCommandTo(user.Mobile, ChatCommand.CloseChatWindow);

        user.CurrentChannel?.RemoveUser(user);

        m_Users.Remove(user);
        m_Table.Remove(user.Mobile);
      }
    }

    public static void RemoveChatUser(Mobile from)
    {
      ChatUser user = GetChatUser(from);

      RemoveChatUser(user);
    }

    public static ChatUser GetChatUser(Mobile from)
    {
      m_Table.TryGetValue(from, out ChatUser c);
      return c;
    }

    public static ChatUser GetChatUser(string username)
    {
      for (int i = 0; i < m_Users.Count; ++i)
      {
        ChatUser user = m_Users[i];

        if (user.Username == username)
          return user;
      }

      return null;
    }

    public static void GlobalSendCommand(ChatCommand command, string param1, string param2 = null)
    {
      GlobalSendCommand(command, null, param1, param2);
    }

    public static void GlobalSendCommand(ChatCommand command, ChatUser initiator = null, string param1 = null, string param2 = null)
    {
      for (int i = 0; i < m_Users.Count; ++i)
      {
        ChatUser user = m_Users[i];

        if (user == initiator)
          continue;

        if (user.CheckOnline())
          ChatSystem.SendCommandTo(user.Mobile, command, param1, param2);
      }
    }
  }
}