using SharpChat.EventStorage;
using System;
using System.Text;

namespace SharpChat.Packet {
    // this entire class is disgusting
    public class ContextMessagePacket : ServerPacket {
        private readonly StoredEventInfo Event;
        private readonly bool Notify;

        public ContextMessagePacket(StoredEventInfo evt, bool notify = false) {
            Event = evt ?? throw new ArgumentNullException(nameof(evt));
            Notify = notify;
        }

        private const string V1_CHATBOT = "-1\tChatBot\tinherit\t";

        public override string Pack() {
            bool isAction = Event.Flags.HasFlag(StoredEventFlags.Action);
            bool isBroadcast = Event.Flags.HasFlag(StoredEventFlags.Broadcast);
            bool isPrivate = Event.Flags.HasFlag(StoredEventFlags.Private);

            StringBuilder sb = new();

            sb.AppendFormat("7\t1\t{0}\t", Event.Created.ToUnixTimeSeconds());

            switch(Event.Type) {
                case "msg:add":
                    if(isBroadcast) {
                        sb.Append(V1_CHATBOT);
                    } else {
                        sb.AppendFormat(
                            "{0}\t{1}\t{2}\t{3} {4} {5} {6} {7}",
                            Event.Sender?.UserId,
                            Event.Sender?.LegacyNameWithStatus,
                            Event.Sender?.Colour,
                            Event.Sender?.Rank,
                            Event.Sender?.Can(ChatUserPermissions.KickUser) == true ? 1 : 0,
                            Event.Sender?.Can(ChatUserPermissions.ViewLogs) == true ? 1 : 0,
                            Event.Sender?.Can(ChatUserPermissions.SetOwnNickname) == true ? 1 : 0,
                            Event.Sender?.Can(ChatUserPermissions.CreateChannel | ChatUserPermissions.SetChannelPermanent, true) == true ? 2 : (
                                Event.Sender?.Can(ChatUserPermissions.CreateChannel) == true ? 1 : 0
                            )
                        );
                    }

                    sb.Append('\t');

                    if(isBroadcast)
                        sb.Append("0\fsay\f");

                    string body = SharpUtil.Sanitise(Event.Data.RootElement.GetProperty("text").GetString());
                    if(isAction)
                        body = string.Format("<i>{0}</i>", body);

                    sb.Append(body);
                    break;

                case "user:connect":
                    sb.AppendFormat("{0}\t0\fjoin\f{1}", V1_CHATBOT, Event.Sender?.LegacyName);
                    break;

                case "chan:join":
                    sb.AppendFormat("{0}\t0\fjchan\f{1}", V1_CHATBOT, Event.Sender?.LegacyName);
                    break;

                case "chan:leave":
                    sb.AppendFormat("{0}\t0\flchan\f{1}", V1_CHATBOT, Event.Sender?.LegacyName);
                    break;

                case "user:disconnect":
                    sb.AppendFormat(
                        "{0}\t0\f{1}\f{2}",
                        V1_CHATBOT,
                        (UserDisconnectReason)Event.Data.RootElement.GetProperty("reason").GetByte() switch {
                            UserDisconnectReason.Flood => "flood",
                            UserDisconnectReason.Kicked => "kick",
                            UserDisconnectReason.TimeOut => "timeout",
                            UserDisconnectReason.Leave => "leave",
                            _ => "leave",
                        },
                        Event.Sender?.LegacyName
                    );
                    break;
            }

            sb.AppendFormat(
                "\t{0}\t{1}\t{2}{3}{4}{5}{6}",
                Event.Id < 1 ? SequenceId : Event.Id,
                Notify ? 1 : 0,
                1,
                isAction ? 1 : 0,
                0,
                isAction ? 0 : 1,
                isPrivate ? 1 : 0
            );

            return sb.ToString();
        }
    }
}