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

namespace MMOserver.Game.Service;

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

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

        Channel.Channel channel = cm.GetChannel(channelId);
        Player? player = channel.GetPlayer(hashKey);
        if (player == null)
        {
            return;
        }

        int oldMapId = player.CurrentMapId;
        int newMapId = packet.MapId;

        // 일단 보스맵에서 로비로 원복할떄 캐싱해둔 걸로 교체
        if (newMapId == -1)
        {
            if (player.PreviousMapId > 0)
            {
                // 레이드 맵 사용 종료 처리
                channel.RemoveInstanceMap(oldMapId);

                newMapId = player.PreviousMapId;
                player.PreviousMapId = 0;
            }
        }

        if (!channel.ChangeMap(hashKey, player, newMapId))
        {
            Log.Warning("[GameServer] CHANGE_MAP 유효하지 않은 맵 HashKey={Key} MapId={MapId}", hashKey, newMapId);
            return;
        }

        PlayerInfo playerInfo = player.ToPlayerInfo();

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

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

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

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

        SendTo(peer, PacketSerializer.Serialize((ushort)PacketCode.CHANGE_MAP, response));
        Log.Debug("[GameServer] CHANGE_MAP HashKey={Key} OldMap={OldMapId} NewMap={MapId}", hashKey, oldMapId, newMapId);
    }
}