using System;
using System.Linq;
using System.Text;

namespace SharpChat {
    public class ChatChannel {
        public string Name { get; }
        public string Password { get; set; }
        public bool IsTemporary { get; set; }
        public int Rank { get; set; }
        public long OwnerId { get; set; }

        public bool HasPassword
            => !string.IsNullOrWhiteSpace(Password);

        public ChatChannel(
            ChatUser owner,
            string name,
            string password = null,
            bool isTemporary = false,
            int rank = 0
        ) : this(name, password, isTemporary, rank, owner?.UserId ?? 0) {}

        public ChatChannel(
            string name,
            string password = null,
            bool isTemporary = false,
            int rank = 0,
            long ownerId = 0
        ) {
            Name = name;
            Password = password ?? string.Empty;
            IsTemporary = isTemporary;
            Rank = rank;
            OwnerId = ownerId;
        }

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

            sb.Append(Name);
            sb.Append('\t');
            sb.Append(string.IsNullOrEmpty(Password) ? '0' : '1');
            sb.Append('\t');
            sb.Append(IsTemporary ? '1' : '0');

            return sb.ToString();
        }

        public bool NameEquals(string name) {
            return string.Equals(name, Name, StringComparison.InvariantCultureIgnoreCase);
        }

        public bool IsOwner(ChatUser user) {
            return OwnerId > 0
                && user != null
                && OwnerId == user.UserId;
        }

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

        public static bool CheckName(string name) {
            return !string.IsNullOrWhiteSpace(name) && name.All(CheckNameChar);
        }

        public static bool CheckNameChar(char c) {
            return char.IsLetter(c) || char.IsNumber(c) || c == '-' || c == '_';
        }
    }
}