using LiteNetLib;
using MMOserver.Game.Channel;
using MMOserver.Game.Channel.Maps;
using MMOserver.Game.Party;
using MMOserver.Packet;
using ProtoBuf;
using Serilog;
using ServerLib.Packet;
using ServerLib.Service;

namespace MMOserver.Game.Service;

/*
 * 파티단위 맵 이동 메시지 핸들러
 */
public partial class GameServer : ServerBase
{
    private void OnPartyChangeMap(NetPeer peer, int hashKey, byte[] payload)
    {
        PartyChangeMapPacket packet = Serializer.Deserialize<PartyChangeMapPacket>(new ReadOnlyMemory<byte>(payload));

        ChannelManager cm = ChannelManager.Instance;
        int channelId = cm.HasUser(hashKey);
        if (channelId < 0)
        {
            return;
        }

        Channel.Channel channel = cm.GetChannel(channelId);

        // 맵 유효성 체크
        if (channel.GetMap(packet.MapId) == null)
        {
            Log.Warning("[GameServer] PARTY_CHANGE_MAP 유효하지 않은 맵 HashKey={Key} MapId={MapId}", hashKey, packet.MapId);
            return;
        }

        // 파티 확인
        PartyInfo? party = channel.GetPartyManager().GetParty(packet.PartyId);
        if (party == null)
        {
            Log.Warning("[GameServer] PARTY_CHANGE_MAP 파티 없음 HashKey={Key} PartyId={PartyId}", hashKey, packet.PartyId);
            return;
        }

        // 파티원 전체 맵 이동 + 각자에게 알림
        foreach (int memberId in party.PartyMemberIds)
        {
            Player? memberPlayer = channel.GetPlayer(memberId);
            if (memberPlayer == null)
            {
                continue;
            }

            int oldMapId = memberPlayer.CurrentMapId;
            channel.ChangeMap(memberId, memberPlayer, packet.MapId);

            if (!sessions.TryGetValue(memberId, out NetPeer? memberPeer))
            {
                continue;
            }

            PlayerInfo memberInfo = memberPlayer.ToPlayerInfo();

            // 기존 맵 유저들에게 퇴장 알림
            ChangeMapPacket exitNotify = new() { MapId = oldMapId, IsAdd = false, Player = memberInfo };
            BroadcastToMap(channelId, oldMapId, PacketSerializer.Serialize((ushort)PacketCode.CHANGE_MAP, exitNotify));

            // 새 맵 유저들에게 입장 알림 (본인 제외)
            ChangeMapPacket enterNotify = new() { MapId = packet.MapId, IsAdd = true, Player = memberInfo };
            BroadcastToMap(channelId, packet.MapId, PacketSerializer.Serialize((ushort)PacketCode.CHANGE_MAP, enterNotify), memberPeer);

            // 본인에게 새 맵 플레이어 목록 전달
            ChangeMapPacket response = new() { MapId = packet.MapId };
            AMap? newMap = channel.GetMap(packet.MapId);
            if (newMap != null)
            {
                foreach ((int uid, Player player) in newMap.GetUsers())
                {
                    if (uid == memberId)
                    {
                        continue;
                    }

                    response.Players.Add(player.ToPlayerInfo());
                }
            }

            SendTo(memberPeer, PacketSerializer.Serialize((ushort)PacketCode.CHANGE_MAP, response));
        }

        Log.Debug("[GameServer] PARTY_CHANGE_MAP HashKey={Key} PartyId={PartyId} MapId={MapId}", hashKey, packet.PartyId, packet.MapId);
    }

}