using Google.Protobuf;
using Google.Protobuf.WellKnownTypes;


using ServerCore;
using ServerBase;
using ServerCommon;
using ServerCommon.BusinessLogDomain;
using MetaAssets;


using SESSION_ID = System.Int32;
using WORLD_META_ID = System.UInt32;
using META_ID = System.UInt32;
using ENTITY_GUID = System.String;
using ACCOUNT_ID = System.String;
using OWNER_GUID = System.String;
using USER_GUID = System.String;
using CHARACTER_GUID = System.String;
using ITEM_GUID = System.String;
using NPC_UNIQUE_ID = System.String;
using UGC_NPC_META_GUID = System.String;


using static ClientToGameMessage.Types;
using static ClientToGameReq.Types;
using static ClientToGameRes.Types;



namespace GameServer.PacketHandler;

[PacketHandler(typeof(ClientToGameReq), typeof(C2GS_REQ_NPC_INFO), typeof(NpcInfoPacketHandler), typeof(GameLoginListener))]
public class NpcInfoPacketHandler : PacketRecvHandler
{
    public static bool send_S2C_ACK_NPC_INFO( Player owner, Result result
                                            , NPC_UNIQUE_ID npcUniqueId = "", OWNER_GUID ownerUserGuid = "", string debugString = "" )
    {
        ArgumentNullException.ThrowIfNull(owner, $"owner is null !!!");
        ArgumentNullException.ThrowIfNull(result, $"result is null !!! - {owner.toBasicString()}");

        var ack_packet = new ClientToGame();
        ack_packet.Response = new ClientToGameRes();

        ack_packet.Response.ErrorCode = result.ErrorCode;

        ack_packet.Response.AckNpcInfo = new GS2C_ACK_NPC_INFO();
        ack_packet.Response.AckNpcInfo.DebugString = debugString;

        if (result.isSuccess())
        {
            ack_packet.Response.AckNpcInfo.NpcUniqueId = npcUniqueId;
            ack_packet.Response.AckNpcInfo.OwnerUserGuid = ownerUserGuid;
        }

        if (false == GameServerApp.getServerLogic().onSendPacket(owner, ack_packet))
        {
            return false;
        }

        var err_msg = $"send_S2C_ACK_NPC_INFO() !!! : {result.toBasicString()} - {owner.toBasicString()}";
        Log.getLogger().info(err_msg);

        return true;
    }

    public override async Task<Result> onProcessPacket(ISession entityWithSession, Google.Protobuf.IMessage recvMessage)
    {
        var result = new Result();
        var err_msg = string.Empty;

        var player = entityWithSession as Player;
        ArgumentNullException.ThrowIfNull(player, $"player is null !!!");

        var recv_msg = recvMessage as ClientToGame;
        ArgumentNullException.ThrowIfNull(recv_msg, $"recv_msg is null !!! - {player.toBasicString()}");
        var request = recv_msg.Request.ReqNpcInfo;
        ArgumentNullException.ThrowIfNull(request, $"request is null !!! - {player.toBasicString()}");

        var player_action = player.getEntityAction<PlayerAction>();
        ArgumentNullException.ThrowIfNull(player_action, $"player_action is null !!! - {player.toBasicString()}");

        var selected_character = player_action.getSelectedCharacter();
        if (null == selected_character)
        {
            err_msg = $"Not selected Character !!! - {player.toBasicString()}";
            result.setFail(ServerErrorCode.CharacterNotSelected, err_msg);
            Log.getLogger().error(result.toBasicString());

            send_S2C_ACK_NPC_INFO(player, result);
            return result;
        }

        var server_logic = GameServerApp.getServerLogic();
        ArgumentNullException.ThrowIfNull(server_logic, $"server_logic is null !!! - {player.toBasicString()}");

        var fn_npc_info_getting = async delegate ()
        {
            var result = new Result();

            var started_transaction_runner = player.findTransactionRunner(TransactionIdType.PrivateContents);
            ArgumentNullException.ThrowIfNull(started_transaction_runner, $"started_transaction_runner is null !!! - {player.toBasicString()}");

            var npc_action = player.getEntityAction<NpcInteractionAction>();
            ArgumentNullException.ThrowIfNull(npc_action, $"npc_action is null !!! - {player.toBasicString()}");

            (result, var found_ugc_npc, var found_master) = await npc_action.findNpc(request.TouchedNpcType, request.NpcUniqueId, request.OwnerUserGuid);
            if (result.isFail())
            {
                err_msg = $"Failed to NpcHelper.findNpc() !!! : {result.toBasicString()} - {started_transaction_runner.toBasicString()}, {player.toBasicString()}";
                Log.getLogger().error(err_msg);

                send_S2C_ACK_NPC_INFO(player, result);
                return result;
            }
            NullReferenceCheckHelper.throwIfNull(found_ugc_npc, () => $"found_ugc_npc is null !!!");
            
            await NpcHelper.notifyNpcInfo(player, request.TouchedNpcType, found_ugc_npc);

            send_S2C_ACK_NPC_INFO(player, result, request.NpcUniqueId, request.OwnerUserGuid);

            return result;
        };

        result = await player.runTransactionRunnerSafely(TransactionIdType.PrivateContents, "fn_npc_info_getting", fn_npc_info_getting);
        if (result.isFail())
        {
            err_msg = $"Failed to runTransactionRunnerSafely() !!! : {result.toBasicString()} - {player.toBasicString()}";
            Log.getLogger().error(err_msg);
        }

        return result;
    }
}