using LiteNetLib;
using MMOserver.Api;
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;

/*
 * 보스레이드 접속 메시지 핸들러
 */
public partial class GameServer : ServerBase
{
    private async void OnIntoBossRaid(NetPeer peer, int hashKey, byte[] payload)
    {
        try
        {
            IntoBossRaidPacket packet = Serializer.Deserialize<IntoBossRaidPacket>(new ReadOnlyMemory<byte>(payload));

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

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

            // 파티 조회
            PartyInfo? party = channel.GetPartyManager().GetPartyByPlayer(hashKey);
            if (party == null)
            {
                Log.Warning("[GameServer] INTO_BOSS_RAID 파티 없음 HashKey={Key}", hashKey);
                SendTo(peer, PacketSerializer.Serialize((ushort)PacketCode.INTO_BOSS_RAID,
                    new IntoBossRaidPacket { RaidId = packet.RaidId, IsSuccess = false, Reason = "파티에 속해있지 않습니다." }));
                return;
            }

            // 파티장만 요청 가능
            if (party.LeaderId != hashKey)
            {
                Log.Warning("[GameServer] INTO_BOSS_RAID 파티장 아님 HashKey={Key} LeaderId={LeaderId}", hashKey, party.LeaderId);
                SendTo(peer, PacketSerializer.Serialize((ushort)PacketCode.INTO_BOSS_RAID,
                    new IntoBossRaidPacket { RaidId = packet.RaidId, IsSuccess = false, Reason = "파티장만 보스 레이드를 시작할 수 있습니다." }));
                return;
            }

            // API로 접속 체크
            List<string> userNames = new List<string>();
            foreach (int memberId in party.PartyMemberIds)
            {
                Player? memberPlayer = channel.GetPlayer(memberId);
                if (memberPlayer != null)
                {
                    userNames.Add(memberPlayer.Nickname);
                }
            }

            BossRaidResult? result = await RestApi.Instance.BossRaidAccessAsync(userNames, packet.RaidId);

            // await 이후 — 공유 자원 접근 보호
            lock (sessionLock)
            {
                // 입장 실패
                if (result == null || result.BossId <= 0)
                {
                    SendTo(peer,
                        PacketSerializer.Serialize((ushort)PacketCode.INTO_BOSS_RAID,
                            new IntoBossRaidPacket { RaidId = -1, IsSuccess = false, Reason = "보스 레이드 방을 배정받지 못했습니다. 잠시 후 다시 시도해주세요." }));

                    Log.Debug("[GameServer] INTO_BOSS_RAID HashKey={Key} PartyId={PartyId} AssignedRaidMapId={RaidId} Failed", hashKey,
                        party.PartyId, -1);
                    return;
                }

                // await 이후 상태 재검증
                channelId = cm.HasUser(hashKey);
                if (channelId < 0)
                {
                    return;
                }

                channel = cm.GetChannel(channelId);
                party = channel.GetPartyManager().GetPartyByPlayer(hashKey);
                if (party == null)
                {
                    return;
                }

                // 레이드 맵 할당 (미사용 맵 탐색 → 없으면 동적 생성)
                int assignedRaidMapId = channel.GetOrCreateAvailableRaidMap();

                // 진행중 맵으로 등록
                channel.AddInstanceMap(assignedRaidMapId);

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

                    // 이전 맵 캐싱 (레이드 종료 후 복귀용)
                    memberPlayer.PreviousMapId = memberPlayer.CurrentMapId;

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

                    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 = assignedRaidMapId, IsAdd = true, Player = memberInfo };
                    BroadcastToMap(channelId, assignedRaidMapId, PacketSerializer.Serialize((ushort)PacketCode.CHANGE_MAP, enterNotify),
                        memberPeer);

                    // 본인에게 새 맵 플레이어 목록 전달
                    ChangeMapPacket response = new() { MapId = assignedRaidMapId };
                    AMap? raidMap = channel.GetMap(assignedRaidMapId);
                    if (raidMap != null)
                    {
                        foreach ((int uid, Player channelPlayer) in raidMap.GetUsers())
                        {
                            if (uid != memberId)
                            {
                                response.Players.Add(channelPlayer.ToPlayerInfo());
                            }
                        }
                    }

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

                    // 각 파티원에게 레이드 입장 결과 전달 (Session, Token 포함)
                    SendTo(memberPeer,
                        PacketSerializer.Serialize((ushort)PacketCode.INTO_BOSS_RAID,
                            new IntoBossRaidPacket
                            {
                                RaidId = assignedRaidMapId, IsSuccess = true, Session = result.SessionName,
                                Token = result.Tokens != null && result.Tokens.TryGetValue(memberPlayer.Nickname, out string? memberToken)
                                    ? memberToken
                                    : ""
                            }));
                }

                Log.Debug("[GameServer] INTO_BOSS_RAID HashKey={Key} PartyId={PartyId} AssignedRaidMapId={RaidId}", hashKey, party.PartyId,
                    assignedRaidMapId);
            }
        }
        catch (Exception e)
        {
            Log.Warning($"[GameServer] Error : {e.Message}");
        }
    }
}