using Amazon.DynamoDBv2.DocumentModel;
using GameServer;
using ServerCommon;
using ServerCore; using ServerBase;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

        private string m_pk = string.Empty;

        private CartDoc m_to_read_cart_docs = new();

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

        //=====================================================================================
        // DB 쿼리 직전에 준비해야 할 로직들을 작성한다.
        //=====================================================================================
        public override Task<Result> onPrepareQuery()
        {
            var result = new Result();
            var err_msg = string.Empty;

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

            var doc = new CartDoc();
            doc.setCombinationKeyForPK(m_combination_key_for_pk);

            var error_code = doc.onApplyPKSK();
            if (error_code.isFail())
            {
                err_msg = $"Failed to onApplyPKSK() !!! : {error_code.toBasicString()} - {toBasicString()}, {owner.toBasicString()}";
                result.setFail(error_code, err_msg);
                Log.getLogger().error(result.toBasicString());
                return Task.FromResult(result);
            }

            m_pk = doc.getPK();

            return Task.FromResult(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 !!!");

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

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

            if (read_docs.Count == 1)
            {
                var cart_action = owner.getEntityAction<CartAction>();
                NullReferenceCheckHelper.throwIfNull(cart_action, () => "cart_action is null !!!");

                result = cart_action.AddCartFromDoc(read_docs[0]);
                if (result.isFail())
                {
                    return result;
                }

                m_to_read_cart_docs = read_docs[0];
            }

            return await Task.FromResult(result);
        }

        public CartDoc getToReadItemDocs() => m_to_read_cart_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 new Player? getOwner() => getQueryBatch()?.getLogActor() as Player;
    }
}