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

namespace SharpChat {
    public class ChatChannel(
        string name,
        string password = "",
        bool isTemporary = false,
        int rank = 0,
        long ownerId = 0
    ) {
        public string Name { get; } = name ?? throw new ArgumentNullException(nameof(name));
        public string Password { get; set; } = password ?? string.Empty;
        public bool IsTemporary { get; set; } = isTemporary;
        public int Rank { get; set; } = rank;
        public long OwnerId { get; set; } = ownerId;

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

        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 == '_';
        }
    }
}