using System;
using System.Text;

namespace SharpChat.SockChat.PacketsS2C {
    public class WhoChannelResponseS2CPacket : ISockChatS2CPacket {
        private readonly long MessageId;
        private readonly DateTimeOffset TimeStamp;
        private readonly string ChannelName;
        private readonly string[] Users;
        private readonly string SelfName;

        public WhoChannelResponseS2CPacket(string channelName, string[] users, string selfName) {
            MessageId = SharpId.Next();
            TimeStamp = DateTimeOffset.UtcNow;
            ChannelName = channelName;
            Users = users;
            SelfName = selfName;
        }

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

            sb.AppendFormat(
                "2\t{0}\t-1\t0\fwhochan\f{1}\f",
                TimeStamp.ToUnixTimeSeconds(),
                SockChatUtility.SanitiseChannelName(ChannelName)
            );

            foreach(string userName in Users) {
                sb.Append(@"<a href=""javascript:void(0);"" onclick=""UI.InsertChatText(this.innerHTML);""");

                if(userName.Equals(SelfName, StringComparison.InvariantCultureIgnoreCase))
                    sb.Append(@" style=""font-weight: bold;""");

                sb.AppendFormat(@">{0}</a>, ", userName);
            }

            if(Users.Length > 0)
                sb.Length -= 2;

            sb.AppendFormat("\t{0}\t10010", MessageId);

            return sb.ToString();
        }
    }
}