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

namespace MMOserver.Game.Service;

/*
 * 파티 요청(추가, 탈퇴, 정보변경) 메시지 핸들러
 */
public partial class GameServer : ServerBase
{
    private void OnRequestParty(NetPeer peer, int hashKey, byte[] payload)
    {
        RequestPartyPacket req = Serializer.Deserialize<RequestPartyPacket>(new ReadOnlyMemory<byte>(payload));

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

        PartyManager pm = cm.GetChannel(channelId).GetPartyManager();

        switch (req.Type)
        {
            case PartyUpdateType.CREATE:
            {
                if (!pm.CreateParty(hashKey, req.PartyName, out PartyInfo? party))
                {
                    SendError(peer, ErrorCode.PARTY_ALREADY_IN_PARTY);
                    return;
                }

                UpdatePartyPacket notify = new()
                {
                    PartyId = party!.PartyId,
                    Type = PartyUpdateType.CREATE,
                    LeaderId = party.LeaderId,
                    PlayerId = hashKey,
                    PartyName = party.PartyName
                };
                byte[] data = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, notify);
                BroadcastToChannel(channelId, data); // 채널 전체 파티 목록 갱신
                break;
            }
            case PartyUpdateType.JOIN:
            {
                if (!pm.JoinParty(hashKey, req.PartyId, out PartyInfo? party))
                {
                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
                    return;
                }

                UpdatePartyPacket notify = new()
                {
                    PartyId = party!.PartyId,
                    Type = PartyUpdateType.JOIN,
                    LeaderId = party.LeaderId,
                    PlayerId = hashKey
                };
                byte[] data = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, notify);
                BroadcastToChannel(channelId, data); // 채널 전체 파티 목록 갱신
                break;
            }
            case PartyUpdateType.LEAVE:
            {
                if (!pm.LeaveParty(hashKey, out PartyInfo? party) || party == null)
                {
                    SendError(peer, ErrorCode.PARTY_NOT_IN_PARTY);
                    return;
                }

                UpdatePartyPacket notify = new()
                {
                    PartyId = party.PartyId, Type = PartyUpdateType.DELETE, LeaderId = party.LeaderId, PlayerId = hashKey
                };

                // 파티가 남아있으면 살린다.
                if (party.PartyMemberIds.Count > 0)
                {
                    notify.Type = PartyUpdateType.LEAVE;
                }

                byte[] data = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, notify);
                BroadcastToChannel(channelId, data); // 채널 전체 파티 목록 갱신 (탈퇴자 포함)
                break;
            }
            case PartyUpdateType.DELETE:
            {
                if (!pm.DeleteParty(hashKey, req.PartyId, out PartyInfo? party))
                {
                    SendError(peer, ErrorCode.PARTY_DELETE_FAILED);
                    return;
                }

                UpdatePartyPacket notify = new()
                {
                    PartyId = party!.PartyId,
                    Type = PartyUpdateType.DELETE,
                    LeaderId = party.LeaderId
                };
                byte[] data = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, notify);
                BroadcastToChannel(channelId, data); // 채널 전체 파티 목록 갱신
                break;
            }
            case PartyUpdateType.UPDATE:
            {
                if (!pm.UpdateParty(hashKey, req.PartyId, req.PartyName, out PartyInfo? party))
                {
                    SendError(peer, ErrorCode.PARTY_UPDATE_FAILED);
                    return;
                }

                UpdatePartyPacket notify = new()
                {
                    PartyId = req.PartyId,
                    Type = PartyUpdateType.UPDATE,
                    LeaderId = party?.LeaderId ?? 0,
                    PlayerId = hashKey,
                    PartyName = req.PartyName
                };
                byte[] data = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, notify);
                BroadcastToChannel(channelId, data); // 채널 전체 파티 목록 갱신
                break;
            }
            case PartyUpdateType.INVITE:
            {
                // 리더만 초대 가능
                PartyInfo? myParty = pm.GetPartyByPlayer(hashKey);
                if (myParty == null || myParty.LeaderId != hashKey)
                {
                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
                    return;
                }

                if (myParty.GetPartyMemberCount() >= PartyInfo.partyMemberMax)
                {
                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
                    return;
                }

                // 대상 플레이어가 같은 채널에 있는지 확인
                int targetId = req.TargetPlayerId;
                Channel.Channel? ch = cm.GetChannel(channelId);
                if (ch == null || ch.GetPlayer(targetId) == null)
                {
                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
                    return;
                }

                // 대상에게 초대 알림 전송
                NetPeer? targetPeer = ch.GetPeer(targetId);
                if (targetPeer == null)
                {
                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
                    return;
                }

                UpdatePartyPacket inviteNotify = new()
                {
                    PartyId = myParty.PartyId,
                    Type = PartyUpdateType.INVITE,
                    LeaderId = hashKey,
                    PlayerId = targetId,
                    PartyName = myParty.PartyName
                };
                byte[] inviteData = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, inviteNotify);
                SendTo(targetPeer, inviteData);
                break;
            }
            case PartyUpdateType.KICK:
            {
                // 리더만 추방 가능
                PartyInfo? myParty2 = pm.GetPartyByPlayer(hashKey);
                if (myParty2 == null || myParty2.LeaderId != hashKey)
                {
                    SendError(peer, ErrorCode.PARTY_DELETE_FAILED);
                    return;
                }

                int kickTarget = req.TargetPlayerId;
                if (kickTarget == hashKey)
                {
                    return; // 자기 자신은 추방 불가
                }

                if (!pm.LeaveParty(kickTarget, out PartyInfo? kickedParty) || kickedParty == null)
                {
                    SendError(peer, ErrorCode.PARTY_NOT_IN_PARTY);
                    return;
                }

                UpdatePartyPacket kickNotify = new()
                {
                    PartyId = kickedParty.PartyId,
                    Type = PartyUpdateType.KICK,
                    LeaderId = kickedParty.LeaderId,
                    PlayerId = kickTarget
                };
                byte[] kickData = PacketSerializer.Serialize((ushort)PacketCode.UPDATE_PARTY, kickNotify);
                BroadcastToChannel(channelId, kickData);
                break;
            }
        }
    }

}