sharp-chat/SharpChat/Packet/ContextChannelsPacket.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SharpChat.Packet {
    public class ContextChannelsPacket : ServerPacket {
        public IEnumerable<ChatChannel> Channels { get; private set; }

        public ContextChannelsPacket(IEnumerable<ChatChannel> channels) {
            Channels = channels?.Where(c => c != null) ?? throw new ArgumentNullException(nameof(channels));
        }

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

            sb.AppendFormat("7\t2\t{0}", Channels.Count());

            foreach(ChatChannel channel in Channels)
                sb.AppendFormat(
                    "\t{0}\t{1}\t{2}",
                    channel.Name,
                    channel.HasPassword ? 1 : 0,
                    channel.IsTemporary ? 1 : 0
                );

            return sb.ToString();
        }
    }
}