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


using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Amazon.DynamoDBv2.Model;
using Google.Protobuf.WellKnownTypes;



using ServerCore; using ServerBase;
using ServerCommon;


using DYNAMO_DB_TABLE_FULL_NAME = System.String;
using SESSION_ID = System.Int32;
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 UGC_NPC_META_GUID = System.String;
using ITEM_GUID = System.String;


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

        private bool m_is_update_last_date = false;

        private PrimaryKey m_primary_key = new();

        //=====================================================================================
        // 0 < deltaCount => 증가
        // 0 > deltaCount => 감소
        //=====================================================================================

        public DBQUgcNpcLikeSelectedFlagUpdate( string combinationKeyForPK
                                              , string combinationKeyForSK
                                              , bool isUpdateLastDate = false)
            : base(typeof(DBQUgcNpcLikeSelectedFlagUpdate).Name)
        {
            m_combination_key_for_pk = combinationKeyForPK;
            m_combination_key_for_sk = combinationKeyForSK;
            m_is_update_last_date = isUpdateLastDate;
        }

        //=====================================================================================
        // 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<UgcNpcLikeSelectedFlagDoc>(m_combination_key_for_pk, m_combination_key_for_sk);
            if (result.isFail())
            {
                return result;
            }
            NullReferenceCheckHelper.throwIfNull(make_primary_key, () => $"make_primary_key is null !!! - {owner.toBasicString()}");

            m_primary_key = make_primary_key;

            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();

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

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

            var db_connector = query_batch.getDynamoDbConnector();
            var selected_flag_query_config = db_connector.makeQueryConfigForReadByPKSK(m_primary_key.PK, m_primary_key.SK);

            (result, var found_selected_flag_docs) = await db_connector.simpleQueryDocTypesWithQueryOperationConfig<UgcNpcLikeSelectedFlagDoc>(selected_flag_query_config, eventTid: query_batch.getTransId());
            if (result.isFail())
            {
                return result;
            }

            if (0 == found_selected_flag_docs.Count)
            {
                // UgcNpcLikeSelectedFlagDoc 없다면 PutItemRequest를 처리 한다.
                var doc = new UgcNpcLikeSelectedFlagDoc(OwnerEntityType.User, m_combination_key_for_pk, m_combination_key_for_sk);
                var attrib = doc.getAttrib<UgcNpcLikeSelectedFlagAttrib>();
                NullReferenceCheckHelper.throwIfNull(attrib, () => $"attrib is null !!!");

                attrib.IsSelectedFlag = true;

                if (m_is_update_last_date) attrib.LastCheckDate = DateTimeHelper.Current; 
                (result, var result_document) = await doc.onCopyToDocument();
                if (result.isFail())
                {
                    err_msg = $"Failed to onCopyToDocument() !!! : {result.toBasicString()}, {doc.toDocTypePKSK()} - {owner.toBasicString()}";
                    Log.getLogger().error(err_msg);

                    return result;
                }

                // PutItemRequest 생성하는 simple 계열의 함수를 DynamoDbClientHelper에 추가한다.
                var put_item_request = new PutItemRequest();
                put_item_request.TableName = db_connector.getTableFullName(doc.TableName);
                put_item_request.Item = result_document.ToAttributeMap();

                var query_context = put_item_request.createItemRequestQueryContext(QueryType.Insert);
                result = await query_runner_with_item_request.tryRegisterQueryContext(query_context);
            }
            else
            {
                // UgcNpcLikeSelectedFlagDoc 있다면 UpdateItemRequest를 처리 한다.
                var selected_flag_attrib = found_selected_flag_docs[0].getAttrib<UgcNpcLikeSelectedFlagAttrib>();
                NullReferenceCheckHelper.throwIfNull(selected_flag_attrib, () => $"selected_flag_attrib is null !!! - {owner.toBasicString()}");

                var to_update_flag = (true == selected_flag_attrib.IsSelectedFlag ? false : true);

                var change_attrib_data = new Dictionary<string, string>();
                change_attrib_data.Add(nameof(UgcNpcLikeSelectedFlagAttrib.IsSelectedFlag), to_update_flag.ToString());
                
                if(m_is_update_last_date) change_attrib_data.Add(nameof(UgcNpcLikeSelectedFlagAttrib.LastCheckDate), DateTimeHelper.Current.ToString(CultureInfo.InvariantCulture));
                
                // UpdateItemRequest를 생성하는 simple 계열의 함수를 DynamoDbClientHelper에 추가한다.
                (result, var update_item_request) = makeUpdateItemRequest( db_connector
                                                                         , db_connector.getTableFullName(found_selected_flag_docs[0].TableName)
                                                                         , m_primary_key.toKeyWithAttributeValue()
                                                                         , change_attrib_data );

                if (result.isFail())
                {
                    return result;
                }

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

                var query_context = update_item_request.createItemRequestQueryContext(QueryType.Upsert);
                result = await query_runner_with_item_request.tryRegisterQueryContext(query_context);
            }

            return result;
        }

        private (Result, UpdateItemRequest?) makeUpdateItemRequest( DynamoDbClient dbClient
                                                                  , DYNAMO_DB_TABLE_FULL_NAME tableFullName
                                                                  , Dictionary<string, AttributeValue> attributeValueWithPrimaryKey
                                                                  , Dictionary<string, string> changeAttribs)
        {
            var result = new Result();

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

            var update_item_request = new UpdateItemRequest();
            update_item_request.TableName = tableFullName;
            update_item_request.Key = attributeValueWithPrimaryKey;
            update_item_request.ExpressionAttributeNames = new Dictionary<string, string>();

            var target_doc = new UgcNpcLikeSelectedFlagDoc();
            var attrib_path_json_string = target_doc.toJsonStringOfAttribs();
            
            var expressionAttributeValues = new Dictionary<string, AttributeValue>();
            var update_expression = "SET ";
            var expression_idx = 0;
            
            if (changeAttribs.Count <= 0)
            {
                var err_msg = $"Failed to DynamoDbClientHelper.toAttributeExpressionFromJson() !!! : attribPath:{attrib_path_json_string} - {owner.toBasicString()}";
                result.setFail(ServerErrorCode.AttribPathMakeFailed, err_msg);
                Log.getLogger().error(result.toBasicString());
                return (result, null);
            }
            
            foreach (var data in changeAttribs)
            {
                var target_key = JsonHelper.getJsonPropertyName<UgcNpcLikeSelectedFlagAttrib>(data.Key);
                (var is_success, var attribute_expression) = DynamoDbClientHelper.toAttributeExpressionFromJson(attrib_path_json_string, target_key);
                if(false == is_success)
                {
                    var err_msg = $"Failed to DynamoDbClientHelper.toAttributeExpressionFromJson() !!! : attribPath:{attrib_path_json_string}, targetKey:{target_key} - {owner.toBasicString()}";
                    result.setFail(ServerErrorCode.AttribPathMakeFailed, err_msg);
                    Log.getLogger().error(result.toBasicString());

                    continue;
                }
                
                var expressionAttributeNames = DynamoDbClientHelper.toExpressionAttributeNamesFromJson(attrib_path_json_string, target_key);
                foreach (var name in expressionAttributeNames)
                {
                    update_item_request.ExpressionAttributeNames.TryAdd(name.Key, name.Value);
                }

                if (expression_idx > 0) update_expression += ",";
                
                update_expression += $" {attribute_expression} = :newValue_{expression_idx}";
                expressionAttributeValues.Add($":newValue_{expression_idx}",  new AttributeValue { S = data.Value });
                
                expression_idx++;
            }
            
            update_item_request.UpdateExpression = update_expression;
            update_item_request.ExpressionAttributeValues = expressionAttributeValues;
            update_item_request.ReturnValues = "ALL_NEW";

            return (result, update_item_request);
        }

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