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


using ServerCore; using ServerBase;
using ServerCommon.BusinessLogDomain;


using SESSION_ID = System.Int32;
using WORLD_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;


namespace ServerCommon
{
    public class DBQEntityWrite : QueryExecutorBase
    {
        private readonly List<DynamoDbDocBase> m_to_write_doc_bases = new();

        public DBQEntityWrite(DynamoDbDocBase toWriteDocBase)
            : base(typeof(DBQEntityWrite).Name)
        {
            m_to_write_doc_bases.Add(toWriteDocBase);
        }

        public DBQEntityWrite(List<DynamoDbDocBase> toWriteDocBases)
            : base(typeof(DBQEntityWrite).Name)
        {
            m_to_write_doc_bases = toWriteDocBases;
        }

        //=====================================================================================
        // 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;

            return result;
        }

        //=====================================================================================
        // onPrepareQuery()를 성공할 경우 호출된다.
        //=====================================================================================
        public override async Task<Result> onQuery()
        {
            var result = new Result();
            var err_msg = string.Empty;

            var owner = getOwner();
            NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");

            var query_batch = getQueryBatch();
            NullReferenceCheckHelper.throwIfNull(query_batch, () => $"query_batch is null !!! - {owner.toBasicString()}");

            var query_runner = query_batch.getQueryRunner();
            NullReferenceCheckHelper.throwIfNull(query_runner, () => $"query_runner is null !!! - {owner.toBasicString()}");

            var dynamo_db_connector = query_batch.getDynamoDbConnector();

            foreach (var to_write_doc in m_to_write_doc_bases)
            {
                (result, var query_context) = await query_runner.tryCreateQueryContext(to_write_doc);
                if (result.isFail())
                {
                    return result;
                }
                NullReferenceCheckHelper.throwIfNull(query_context, () => $"query_context is null !!! - {owner.toBasicString()}");

                result = await query_runner.tryRegisterQueryContext(query_context);
                if (result.isFail())
                {
                    return result;
                }
            }

            var msg = $"{this.getTypeName()} : tryWriteCount:{m_to_write_doc_bases.Count}, isUseTransact:{query_batch.isUseTransact()} - TransId:{query_batch.getTransId()}";
            Log.getLogger().info(msg);

            return result;
        }

        public List<DynamoDbDocBase> getToWriteDocBases() => m_to_write_doc_bases;

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