using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


using ServerCore; using ServerBase;
using ServerCommon;


using UGC_NPC_META_GUID = System.String;


namespace GameServer
{
    public class DBQUgcNpcReadAll : QueryExecutorBase
    {
        private string m_combination_key_for_pk = string.Empty;

        private string m_pk = string.Empty;

        private readonly List<UgcNpcDoc> m_to_read_npc_docs = new();

        private readonly List<AppearanceCustomizeDoc> m_to_read_appearance_customize_docs = new();

        private readonly HashSet<UGC_NPC_META_GUID> m_attached_ugc_npc_meta_guid = new();

        public DBQUgcNpcReadAll(string combinationKeyForPK)
            : base(typeof(DBQUgcNpcReadAll).Name)
        {
            m_combination_key_for_pk = combinationKeyForPK;
        }

        //=====================================================================================
        // DB 쿼리 직전에 준비해야 할 로직들을 작성한다.
        //=====================================================================================
        public override async Task<Result> onPrepareQuery()
        {
            await Task.CompletedTask;

            var result = new Result();
            var err_msg = string.Empty;

            var owner = getOwner();

            (result, var make_primary_key) = await DynamoDBDocBaseHelper.makePrimaryKey<UgcNpcDoc>(m_combination_key_for_pk);
            if (result.isFail())
            {
                return result;
            }
            NullReferenceCheckHelper.throwIfNull(make_primary_key, () => $"make_primary_key is null !!! - {owner.toBasicString()}");

            m_pk = make_primary_key.PK;

            return result;
        }

        //=====================================================================================
        // onPrepareQuery()를 성공할 경우 호출된다.
        //=====================================================================================
        public override async Task<Result> onQuery()
        {
            await Task.CompletedTask;

            var result = new Result();
            var err_msg = string.Empty;

            var owner = getOwner();

            var server_logic = GameServerApp.getServerLogic();

            var player_action = owner.getEntityAction<PlayerAction>();
            NullReferenceCheckHelper.throwIfNull(player_action, () => $"player_action is null !!! - {owner.toBasicString()}");

            var query_batch = getQueryBatch();
            NullReferenceCheckHelper.throwIfNull(query_batch, () => $"query_batch is null !!!");

            var db_connector = query_batch.getDynamoDbConnector();
            var query_config = db_connector.makeQueryConfigForReadByPKOnly(m_pk);

            (result, var read_docs) = await db_connector.simpleQueryDocTypesWithQueryOperationConfig<UgcNpcDoc>(query_config, eventTid: query_batch.getTransId());
            if (result.isFail())
            {
                return result;
            }

            var ugc_npc_creation_or_load_action = owner.getEntityAction<UgcNpcCreationOrLoadAction>();
            NullReferenceCheckHelper.throwIfNull(ugc_npc_creation_or_load_action, () => $"ugc_npc_creation_or_load_action is null !!! - {owner.toBasicString()}");

            foreach (var read_ugc_npc_doc in read_docs)
            {
                var ugc_npc_attrib = read_ugc_npc_doc.getAttrib<UgcNpcAttrib>();
                NullReferenceCheckHelper.throwIfNull(ugc_npc_attrib, () => $"ugc_npc_attrib is null !!! - {owner.toBasicString()}");

                var found_ugc_npc_in_game_zone = server_logic.findUgcNpcInGameZone(ugc_npc_attrib.UgcNpcMetaGuid);
                if(null != found_ugc_npc_in_game_zone)
                {
                    result = await player_action.tryAttachUgcNpcInGameZone(found_ugc_npc_in_game_zone);
                    if(result.isFail()) 
                    { 
                        return result; 
                    }

                    m_attached_ugc_npc_meta_guid.Add(ugc_npc_attrib.UgcNpcMetaGuid);
                }
                else
                {
                    result = await ugc_npc_creation_or_load_action.tryLoadUgcNpcFromDoc(read_ugc_npc_doc);
                    if (result.isFail())
                    {
                        return result;
                    }

                    result = await ugc_npc_creation_or_load_action.tryLoadApprearanceCustomize(db_connector, ugc_npc_attrib.UgcNpcMetaGuid);
                    if (result.isFail())
                    {
                        return result;
                    }

                    result = await ugc_npc_creation_or_load_action.tryLoadBeaconShopItem(db_connector, ugc_npc_attrib.UgcNpcMetaGuid);
                    if (result.isFail())
                    {
                        return result;
                    }

                    result = await ugc_npc_creation_or_load_action.tryLoadBeaconShopProfile(db_connector, ugc_npc_attrib.UgcNpcMetaGuid);
                    if (result.isFail())
                    {
                        return result;
                    }

                    m_to_read_npc_docs.Add(read_ugc_npc_doc);
                }
            }

            return result;
        }

        public HashSet<UGC_NPC_META_GUID> getAttachedUgcNpcGuids() => m_attached_ugc_npc_meta_guid;

        public List<UgcNpcDoc> getToReadUgcNpcDocs() => m_to_read_npc_docs;

        //=====================================================================================
        // DB 쿼리를 성공하고, doFnCommit()가 QueryResultType.NotCalledQueryFunc를 반환할 경우 호출된다.
        //=====================================================================================
        public override async Task onQueryResponseCommit()
        {
            await Task.CompletedTask;
            return;
        }

        //=====================================================================================
        // DB 쿼리를 실패하고, doFnRollback()가 QueryResultType.NotCalledQueryFunc를 반환할 경우 호출된다.
        //=====================================================================================
        public override async Task onQueryResponseRollback(Result errorResult)
        {
            await Task.CompletedTask;
            return;
        }

        public override Player getOwner()
        {
            var owner = base.getOwner() as Player;
            NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");

            return owner;
        }
    }
}