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;
using USER_GUID = System.String;


namespace ServerCommon
{
    public class LandAttribute : EntityAttributeBase, ICopyEntityAttributeFromDoc, IMergeWithEntityAttribute
    {
        [JsonProperty]
        public string OwnerUserGuid { get; set; } = string.Empty;

        [JsonProperty]
        public META_ID LandMetaId { get; set; } = 0;

        [JsonProperty]
        public string LandName { get; set; } = string.Empty;

        [JsonProperty]
        public string Description { get; set; } = string.Empty;

        public bool IsLoadFromDb = false;

        public LandAttribute(EntityBase owner)
            : base(owner)
        {
        }

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

        public override void onClear()
        {
            LandMetaId = 0;
            LandName = string.Empty;
            Description = string.Empty;
            OwnerUserGuid = string.Empty;
            IsLoadFromDb = false;

            getAttributeState().reset();
        }

        public override EntityAttributeBase onCloned()
        {
            var cloned = new LandAttribute(getOwner());

            cloned.deepCopyFromBase(this);

            cloned.LandMetaId = LandMetaId;
            cloned.LandName = LandName;
            cloned.Description = Description;
            cloned.OwnerUserGuid = OwnerUserGuid;
            cloned.IsLoadFromDb = IsLoadFromDb;

            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 !!!");

            //=====================================================================================
            // Attribute => try pending Doc
            //=====================================================================================
            var try_pending_doc = getTryPendingDocBase() as LandDoc;
            if (null == try_pending_doc)
            {
                var to_copy_doc = new LandDoc(LandMetaId);

                var origin_doc = getOriginDocBase<LandAttribute>();
                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<LandAttrib>();
            NullReferenceCheckHelper.throwIfNull(to_copy_doc_attrib, () => $"to_copy_doc_attrib is null !!! - {owner.toBasicString()}");

            to_copy_doc_attrib.LandMetaId = LandMetaId;
            to_copy_doc_attrib.LandName = LandName;
            to_copy_doc_attrib.Description = Description;
            to_copy_doc_attrib.OwnerUserGuid = OwnerUserGuid;

            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 err_msg = string.Empty;

            var to_cast_string = typeof(LandDoc).Name;

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

            //=====================================================================================
            // New Doc => Origin Doc
            //=====================================================================================
            syncOriginDocBaseWithNewDoc<LandAttribute>(land_doc_base);

            //=====================================================================================
            // Doc => Attribute
            //=====================================================================================
            var doc_attrib = land_doc_base.getAttrib<LandAttrib>();
            NullReferenceCheckHelper.throwIfNull(doc_attrib, () => "doc_attrib is null !!!");

            LandMetaId = doc_attrib.LandMetaId;
            LandName = doc_attrib.LandName;
            Description = doc_attrib.Description;
            OwnerUserGuid = doc_attrib.OwnerUserGuid;
            IsLoadFromDb = true;

            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 land_attribute = otherEntityAttribute as LandAttribute;
            if (null == land_attribute)
            {
                err_msg = $"Failed to cast LandAttribute !!!, land_attribute is null";
                result.setFail(ServerErrorCode.ClassTypeCastIsNull, err_msg);
                Log.getLogger().error(result.toBasicString());

                return result;
            }

            LandMetaId = land_attribute.LandMetaId;
            LandName = land_attribute.LandName;
            Description = land_attribute.Description;
            OwnerUserGuid = land_attribute.OwnerUserGuid;
            IsLoadFromDb = land_attribute.IsLoadFromDb;

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

                syncOriginDocBaseWithNewDoc<LandAttribute>(try_pending_doc);
            }

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

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

            land_attrib.LandMetaId = LandMetaId;
            land_attrib.LandName = LandName;
            land_attrib.Description = Description;
            land_attrib.OwnerUserGuid = OwnerUserGuid;

            return result;
        }
    }


    public class LandAttributeTransactor : EntityAttributeTransactorBase<LandAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
    {
        public LandAttributeTransactor(EntityBase owner)
            : base(owner)
        {
        }

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

            var to_cast_string = typeof(LandAttribute).Name;

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

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

            copy_to_land_attribute.LandMetaId = copy_from_land_attribute.LandMetaId;
            copy_to_land_attribute.LandName = copy_from_land_attribute.LandName;
            copy_to_land_attribute.Description = copy_from_land_attribute.Description;
            copy_to_land_attribute.OwnerUserGuid = copy_from_land_attribute.OwnerUserGuid;
            copy_to_land_attribute.IsLoadFromDb = copy_from_land_attribute.IsLoadFromDb;

            return true;
        }
    }
}