using SharpChat.Misuzu;
using System;
using System.Text;

namespace SharpChat {
    public class ChatUser : IEquatable<ChatUser> {
        public const int DEFAULT_SIZE = 30;
        public const int DEFAULT_MINIMUM_DELAY = 10000;
        public const int DEFAULT_RISKY_OFFSET = 5;

        private const int RANK_NO_FLOOD = 9;

        public long UserId { get; set; }
        public string Username { get; set; }
        public ChatColour Colour { get; set; }
        public int Rank { get; set; }
        public string Nickname { get; set; }
        public ChatUserPermissions Permissions { get; set; }
        public ChatUserStatus Status { get; set; } = ChatUserStatus.Online;
        public string StatusMessage { get; set; }

        public bool HasFloodProtection
            => Rank < RANK_NO_FLOOD;

        // This needs to be a session thing
        public ChatChannel CurrentChannel { get; set; }

        public string DisplayName {
            get {
                StringBuilder sb = new();

                if(Status == ChatUserStatus.Away)
                    sb.AppendFormat("&lt;{0}&gt;_", StatusMessage[..Math.Min(StatusMessage.Length, 5)].ToUpperInvariant());

                if(string.IsNullOrWhiteSpace(Nickname))
                    sb.Append(Username);
                else {
                    sb.Append('~');
                    sb.Append(Nickname);
                }

                return sb.ToString();
            }
        }

        public ChatUser() { }

        public ChatUser(MisuzuAuthInfo auth) {
            UserId = auth.UserId;
            ApplyAuth(auth);
        }

        public void ApplyAuth(MisuzuAuthInfo auth) {
            Username = auth.Username;

            if(Status == ChatUserStatus.Offline)
                Status = ChatUserStatus.Online;

            Colour = ChatColour.FromMisuzu(auth.ColourRaw);
            Rank = auth.Rank;
            Permissions = auth.Permissions;
        }

        public bool Can(ChatUserPermissions perm, bool strict = false) {
            ChatUserPermissions perms = Permissions & perm;
            return strict ? perms == perm : perms > 0;
        }

        public string Pack() {
            StringBuilder sb = new();

            sb.Append(UserId);
            sb.Append('\t');
            sb.Append(DisplayName);
            sb.Append('\t');
            sb.Append(Colour);
            sb.Append('\t');
            sb.Append(Rank);
            sb.Append(' ');
            sb.Append(Can(ChatUserPermissions.KickUser) ? '1' : '0');
            sb.Append(" 0 "); // view logs
            sb.Append(Can(ChatUserPermissions.SetOwnNickname) ? '1' : '0');
            sb.Append(' ');
            sb.Append(Can(ChatUserPermissions.CreateChannel | ChatUserPermissions.SetChannelPermanent, true) ? 2 : (
                Can(ChatUserPermissions.CreateChannel) ? 1 : 0
            ));

            return sb.ToString();
        }

        public bool NameEquals(string name) {
            return string.Equals(name, Username, StringComparison.InvariantCultureIgnoreCase)
                || string.Equals(name, Nickname, StringComparison.InvariantCultureIgnoreCase)
                || string.Equals(name, DisplayName, StringComparison.InvariantCultureIgnoreCase);
        }

        public override int GetHashCode() {
            return UserId.GetHashCode();
        }

        public override bool Equals(object obj) {
            return Equals(obj as ChatUser);
        }

        public bool Equals(ChatUser other) {
            return UserId == other?.UserId;
        }

        public static string GetDMChannelName(ChatUser user1, ChatUser user2) {
            return user1.UserId < user2.UserId
                ? $"@{user1.UserId}-{user2.UserId}"
                : $"@{user2.UserId}-{user1.UserId}";
        }
    }
}