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


using ServerCore; using ServerBase;
using ServerCommon;
using Amazon.S3.Model;


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

        private string m_pk = string.Empty;

        private ToolActionDoc? m_to_read_tool_action_doc_nullable;

        public DBQToolActionRead(string combinationKeyForPK)
            : base(typeof(DBQToolActionRead).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<ToolActionDoc>(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 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<ToolActionDoc>(query_config, eventTid: query_batch.getTransId());
            if (result.isFail())
            {
                return result;
            }

            if(0 < read_docs.Count) 
            {
                if(1 < read_docs.Count)
                {
                    err_msg = $"More than One registered ToolAction !!! : TgtDoc:{typeof(ToolActionDoc).Name} - {owner.toBasicString()}";
                    Log.getLogger().warn(result.toBasicString());
                }
                
                var to_read_doc = read_docs[0];

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

                result = await item_tool_action.tryLoadToolActionFromDoc(to_read_doc);
                if (result.isFail())
                {
                    return result;
                }

                m_to_read_tool_action_doc_nullable = to_read_doc;
            }

            return result;
        }

        public ToolActionDoc? getToReadToolActionDoc() => m_to_read_tool_action_doc_nullable;

        //=====================================================================================
        // 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;
        }
    }
}