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


using Newtonsoft.Json;


using ServerCore; using ServerBase;


using META_ID = System.UInt32;


namespace ServerCommon
{
    public class ItemFirstPurchaseHistoryAttribute : EntityAttributeBase, ICopyEntityAttributeFromDoc, IMergeWithEntityAttribute
    {
        [JsonProperty]
        public META_ID ItemMetaId { get; set; } = 0;

        [JsonProperty]
        public DateTime FirstPurchaseTime { get; set; } = new();

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

        public override IEntityAttributeTransactor onNewEntityAttributeTransactor()
        {
            return new ItemFirstPurchaseHistoryAttributeTransactor(getOwner());
        }

        public override void onClear()
        {
            ItemMetaId = 0;
            FirstPurchaseTime = new();

            getAttributeState().reset();
        }

        public override EntityAttributeBase onCloned()
        {
            var owner_entity_type = getEntityOfOwnerEntityType();
            NullReferenceCheckHelper.throwIfNull(owner_entity_type, () => $"Owner Entity Type is null !!! ");

            var cloned = new ItemFirstPurchaseHistoryAttribute(getOwner(), owner_entity_type);

            cloned.deepCopyFromBase(this);

            cloned.ItemMetaId = ItemMetaId;
            cloned.FirstPurchaseTime = FirstPurchaseTime;

            return cloned;
        }

        public override async Task<(Result, DynamoDbDocBase?)> toDocBase(bool isForQuery = true)
        {
            var result = new Result();

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

            var user_attribute = owner.getRootParent().getEntityAttribute<UserAttribute>();
            NullReferenceCheckHelper.throwIfNull(user_attribute, () => $"user attribute is null !!! - {owner.toBasicString()}");

            var user_guid = user_attribute.UserGuid;

            //=====================================================================================
            // Attribute => try pending Doc
            //=====================================================================================
            var try_pending_doc = getTryPendingDocBase() as ItemFirstPurchaseHistoryDoc;
            if (null == try_pending_doc)
            {
                var to_copy_doc = new ItemFirstPurchaseHistoryDoc(user_guid, ItemMetaId);

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

                try_pending_doc = to_copy_doc;

                setTryPendingDocBase(try_pending_doc);
            }

            var to_copy_doc_attrib = try_pending_doc.getAttrib<ItemFirstPurchaseHistoryAttrib>();
            NullReferenceCheckHelper.throwIfNull(to_copy_doc_attrib, () => $"to_copy_doc_attrib is null !!! - {owner.toBasicString()}");

            to_copy_doc_attrib.ItemMetaId = ItemMetaId;
            to_copy_doc_attrib.FirstPurchaseTime = FirstPurchaseTime;

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

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

            return (result, to_query_docs);
        }

        public bool copyEntityAttributeFromDoc(DynamoDbDocBase? docBase)
        {
            var err_msg = string.Empty;

            var to_cast_string = typeof(ItemFirstPurchaseHistoryDoc).Name;

            var item_first_purchase_history_doc_base = docBase as ItemFirstPurchaseHistoryDoc;
            if (null == item_first_purchase_history_doc_base)
            {
                err_msg = $"Failed to copyEntityAttributeFromDoc() !!!, item_first_purchase_history_doc_base is null :{to_cast_string}";
                Log.getLogger().error(err_msg);
                return false;
            }

            //=====================================================================================
            // New Doc => Origin Doc
            //=====================================================================================
            syncOriginDocBaseWithNewDoc<ItemFirstPurchaseHistoryAttribute>(item_first_purchase_history_doc_base);

            //=====================================================================================
            // Doc => Attribute
            //=====================================================================================
            var doc_attrib = item_first_purchase_history_doc_base.getAttrib<ItemFirstPurchaseHistoryAttrib>();
            NullReferenceCheckHelper.throwIfNull(doc_attrib, () => $"doc_attrib is null !!! - {getOwner().toBasicString()}");

            ItemMetaId = doc_attrib.ItemMetaId;
            FirstPurchaseTime = doc_attrib.FirstPurchaseTime;

            return true;
        }

        public Result onMerge(EntityAttributeBase otherEntityAttribute)
        {
            var owner = getOwner();
            NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");

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

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

                return result;
            }

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

                return result;
            }

            ItemMetaId = item_first_purchase_histroy_attribute.ItemMetaId;
            FirstPurchaseTime = item_first_purchase_histroy_attribute.FirstPurchaseTime;

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

                syncOriginDocBaseWithNewDoc<ItemFirstPurchaseHistoryAttribute>(try_pending_doc);
            }

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

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

            item_first_purchase_history_attrib.ItemMetaId = ItemMetaId;
            item_first_purchase_history_attrib.FirstPurchaseTime = FirstPurchaseTime;

            return result;
        }
    }

    public class ItemFirstPurchaseHistoryAttributeTransactor : EntityAttributeTransactorBase<ItemFirstPurchaseHistoryAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
    {
        public ItemFirstPurchaseHistoryAttributeTransactor(EntityBase owner)
            : base(owner)
        {
        }

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

            var to_cast_string = typeof(ItemFirstPurchaseHistoryAttribute).Name;

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

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

            copy_to_item_first_purchase_history_attribute.ItemMetaId = copy_from_item_first_purchase_history_attribute.ItemMetaId;
            copy_to_item_first_purchase_history_attribute.FirstPurchaseTime = copy_from_item_first_purchase_history_attribute.FirstPurchaseTime;

            return true;
        }
    }
}