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


using Newtonsoft.Json;
using Microsoft.AspNetCore.DataProtection.KeyManagement;


using ServerCore; using ServerBase;


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;
using UI_KEY = System.String;
using DATA_KEY = System.String;


namespace ServerCommon
{
    //=============================================================================================
    //
    // 클라이언트 Data 전용 DB 저장 정보
    // 
    // - 서버측에서 로직 관여 하지 않는다. (읽기, 쓰기 only)
    // - 추후 String 타입으로 하나의 변수로 저장 하도록 수정 한다. (전용 패킷 추가, 클라이언트와 협의)
    //   
    //=============================================================================================

    public class CustomDefinedDataAttribute : EntityAttributeBase, ICopyEntityAttributeFromDoc, IMergeWithEntityAttribute
    {
        public DATA_KEY DataKey { get; set; } = string.Empty;
        public string CustomDefinedData { get; set; } = string.Empty;


        public CustomDefinedDataAttribute(EntityBase owner, EntityBase entityOfOwnerEntityType)
            : base(owner, entityOfOwnerEntityType)
        {
        }

        public override IEntityAttributeTransactor onNewEntityAttributeTransactor()
        {
            return new CustomDefinedDataAttributeTransactor(getOwner().getRootParent());
        }

        public override void onClear()
        {
            DataKey = string.Empty;
            CustomDefinedData = string.Empty;

            getAttributeState().reset();
        }

        public override EntityAttributeBase onCloned()
        {
            var owner = getOwner();
            
            var entity_of_owner_entity_type = getEntityOfOwnerEntityType();
            NullReferenceCheckHelper.throwIfNull(entity_of_owner_entity_type, () => $"entity_of_owner_entity_type is null !!!");

            var cloned = new CustomDefinedDataAttribute(owner, entity_of_owner_entity_type);

            cloned.deepCopyFromBase(this);

            cloned.DataKey = DataKey;
            cloned.CustomDefinedData = CustomDefinedData;

            return cloned;
        }

        public override async Task<(Result, DynamoDbDocBase?)> toDocBase(bool isForQuery = true)
        {
            var owner = getOwner();
            var parent = owner.getRootParent();

            var result = new Result();

            var user_attribute = parent.getOriginEntityAttribute<UserAttribute>();
            NullReferenceCheckHelper.throwIfNull(user_attribute, () => $"user_attribute is null !!! - {parent.toBasicString()}");

            var user_guid = user_attribute.UserGuid;

            //=====================================================================================
            // Attribute => try pending Doc
            //=====================================================================================
            var try_pending_doc = getTryPendingDocBase() as CustomDefinedDataDoc ;
            if (null == try_pending_doc)
            {
                var to_copy_doc = new CustomDefinedDataDoc(OwnerEntityType.User, user_guid, DataKey);

                var origin_doc = getOriginDocBase<CustomDefinedDataAttribute>();
                if (null != origin_doc)
                {
                    to_copy_doc.copyTimestampsFromOriginDocBase(origin_doc);
                }

                try_pending_doc = to_copy_doc;

                setTryPendingDocBase(try_pending_doc);
            }

            var to_copy_doc_custom_defined_data_attrib = try_pending_doc.getAttrib<CustomDefinedDataAttrib>();
            NullReferenceCheckHelper.throwIfNull(to_copy_doc_custom_defined_data_attrib, () => $"to_copy_doc_custom_defined_data_attrib is null !!! - {parent.toBasicString()}");

            to_copy_doc_custom_defined_data_attrib.CustomDefinedData = CustomDefinedData;

            if (false == isForQuery)
            {
                return (result, try_pending_doc);
            }

            //=====================================================================================
            // Doc QueryType 반영
            //=====================================================================================
            (result, var to_query_doc) = await applyDoc4Query(try_pending_doc);
            if (result.isFail())
            {
                return (result, null);
            }

            return (result, to_query_doc);
        }

        public bool copyEntityAttributeFromDoc(DynamoDbDocBase? docBase)
        {
            var owner = getOwner();
            var parent = owner.getRootParent();

            var err_msg = string.Empty;

            var to_cast_string = typeof(CustomDefinedUiDoc).Name;

            var custom_defined_data_doc = docBase as CustomDefinedDataDoc;
            if (null == custom_defined_data_doc)
            {
                err_msg = $"Failed to copyEntityAttributeFromDoc() !!!, custom_defined_ui_doc is null :{to_cast_string} - {parent.toBasicString()}";
                Log.getLogger().error(err_msg);
                return false;
            }

            //=====================================================================================
            // New Doc => Origin Doc
            //=====================================================================================
            syncOriginDocBaseWithNewDoc<CustomDefinedDataAttribute>(custom_defined_data_doc);

            //=====================================================================================
            // Doc => Doc, Attribute
            //=====================================================================================
            var doc_custom_defined_data_attrib = custom_defined_data_doc.getAttrib<CustomDefinedDataAttrib>();
            NullReferenceCheckHelper.throwIfNull(doc_custom_defined_data_attrib, () => $"doc_custom_defined_data_attrib is null !!! - {parent.toBasicString()}");

            DataKey = doc_custom_defined_data_attrib.DataKey;
            CustomDefinedData = doc_custom_defined_data_attrib.CustomDefinedData;

            return true;
        }

        public Result onMerge(EntityAttributeBase otherEntityAttribute)
        {
            var owner = getOwner();
            var parent = owner.getRootParent();

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

            if (null == otherEntityAttribute)
            {
                err_msg = $"Invalid Param !!!, otherEntityAttribute is null - {parent.toBasicString()}";
                result.setFail(ServerErrorCode.FunctionParamNull, err_msg);
                Log.getLogger().error(result.toBasicString());

                return result;
            }

            //=====================================================================================
            // OtherAttribute => Attribute
            //=====================================================================================
            var custom_defined_data_attribute = otherEntityAttribute as CustomDefinedDataAttribute;
            if (null == custom_defined_data_attribute)
            {
                err_msg = $"Failed to cast CustomDefinedDataAttribute !!!, custom_defined_data_attribute is null - {parent.toBasicString()}";
                result.setFail(ServerErrorCode.ClassTypeCastIsNull, err_msg);
                Log.getLogger().error(result.toBasicString());

                return result;
            }

            CustomDefinedData = custom_defined_data_attribute.CustomDefinedData;

            //=====================================================================================
            // Attribute Try Pending Doc => Origin Doc
            //=====================================================================================
            var try_pending_doc = custom_defined_data_attribute.getTryPendingDocBase() as CustomDefinedDataDoc ;
            if (null != try_pending_doc)
            {
                custom_defined_data_attribute.resetTryPendingDocBase();

                syncOriginDocBaseWithNewDoc<CustomDefinedDataAttribute>(try_pending_doc);
            }

            var origin_doc_base = getOriginDocBase<CustomDefinedDataAttribute>();
            if (null == origin_doc_base)
            {
                // DB 에 저장되어 있지 않는 경우 OriginDoc은 null 이다 !!!
                return result;
            }

            var custom_defined_data_attrib = origin_doc_base.getAttrib<CustomDefinedDataAttrib>();
            NullReferenceCheckHelper.throwIfNull(custom_defined_data_attrib, () => $"custom_defined_data_attrib is null !!! - {owner.toBasicString()}");

            custom_defined_data_attrib.CustomDefinedData = CustomDefinedData;

            return result;
        }
    }

    public class CustomDefinedDataAttributeTransactor : EntityAttributeTransactorBase<CustomDefinedDataAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
    {
        public CustomDefinedDataAttributeTransactor(EntityBase owner)
            : base(owner)
        {
        }

        public bool copyEntityAttributeTransactorFromEntityAttribute(EntityAttributeBase? entityAttributeBase)
        {
            var err_msg = string.Empty;

            var to_cast_string = typeof(CustomDefinedUiAttribute).Name;

            var copy_from_custom_defined_data_attribute = entityAttributeBase as CustomDefinedDataAttribute;
            if (null == copy_from_custom_defined_data_attribute)
            {
                err_msg = $"Failed to copyEntityAttributeTransactorFromEntityAttribute() !!!, copy_from_custom_defined_data_attribute is null :{to_cast_string}";
                Log.getLogger().error(err_msg);
                return false;
            }

            var copy_to_custom_defined_data_attribute = getClonedEntityAttribute() as CustomDefinedDataAttribute;
            if (null == copy_to_custom_defined_data_attribute)
            {
                err_msg = $"Failed to copyEntityAttributeTransactorBaseFromEntityAttribute() !!!, copy_to_custom_defined_data_attribute is null :{to_cast_string}";
                Log.getLogger().error(err_msg);
                return false;
            }

            copy_to_custom_defined_data_attribute.DataKey = copy_from_custom_defined_data_attribute.DataKey;
            copy_to_custom_defined_data_attribute.CustomDefinedData = copy_from_custom_defined_data_attribute.CustomDefinedData;

            return true;
        }
    }
}