using System;
using System.Collections.Generic;


using Newtonsoft.Json;


using ServerCore; using ServerBase;


using USER_GUID = System.String;


namespace ServerCommon
{
    public class CraftHelpAttribute : EntityAttributeBase, ICopyEntityAttributeFromDoc, IMergeWithEntityAttribute
    {
        [JsonProperty]
        public List<USER_GUID> HelpUserGuids { get; set; } = new();
        [JsonProperty]
        public List<USER_GUID> HelpedUserGuids { get; set; } = new();
        [JsonProperty]
        public DateTime CraftHelpUpdateDay { get; set; } = DateTime.UtcNow;


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

        public override void onClear()
        {
            HelpUserGuids.Clear();
            HelpedUserGuids.Clear();
            CraftHelpUpdateDay = new();
        }

        public override EntityAttributeBase onCloned()
        {
            var cloned = new CraftHelpAttribute(getOwner());
            cloned.HelpUserGuids = HelpUserGuids.Select(x => x).ToList();
            cloned.HelpedUserGuids = HelpedUserGuids.Select(x => x).ToList();
            cloned.CraftHelpUpdateDay = CraftHelpUpdateDay;
            return cloned;
        }

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

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

            var acoount_attribute = getOwner().getRootParent().getEntityAttribute<AccountAttribute>();
            NullReferenceCheckHelper.throwIfNull(acoount_attribute, () => $"acoount_attribute is null !!!");

            USER_GUID user_guid = acoount_attribute.UserGuid;

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

                var origin_doc = getOriginDocBase<CraftHelpAttribute>();
                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<CraftHelpAttrib>();
            NullReferenceCheckHelper.throwIfNull(to_copy_doc_attrib, () => $"to_copy_doc_attrib is null !!!");

            to_copy_doc_attrib.HelpUserGuids = HelpUserGuids.Select(x => x).ToList();
            to_copy_doc_attrib.HelpedUserGuids = HelpedUserGuids.Select(x => x).ToList();
            to_copy_doc_attrib.CraftHelpUpdateDay = CraftHelpUpdateDay;

            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, to_query_doc);
            }

            return (result, to_query_doc);
        }

        public bool copyEntityAttributeFromDoc(DynamoDbDocBase docBase)
        {
            var result = new Result();
            var err_msg = string.Empty;

            var to_cast_string = typeof(CraftHelpDoc).Name;

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

            //=====================================================================================
            // New Doc => Origin Doc
            //=====================================================================================
            syncOriginDocBaseWithNewDoc<CraftHelpAttribute>(craft_help_doc_base);

            //=====================================================================================
            // Doc => Attribute
            //=====================================================================================
            var doc_attrib = craft_help_doc_base.getAttrib<CraftHelpAttrib>();
            if (doc_attrib == null)
            {
                err_msg = $"Failed to get craft help attrib : {nameof(CraftHelpAttrib)}";
                result.setFail(ServerErrorCode.EntityAttributeIsNull, err_msg);
                Log.getLogger().error(err_msg);
                return false;
            }

            HelpUserGuids = doc_attrib.HelpUserGuids.Select(x => x).ToList();
            HelpedUserGuids = doc_attrib.HelpedUserGuids.Select(x => x).ToList();
            CraftHelpUpdateDay = doc_attrib.CraftHelpUpdateDay;

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

                return result;
            }

            HelpUserGuids = craft_help_attribute.HelpUserGuids.Select(x => x).ToList();
            HelpedUserGuids = craft_help_attribute.HelpedUserGuids.Select(x => x).ToList();
            CraftHelpUpdateDay = craft_help_attribute.CraftHelpUpdateDay;

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

                syncOriginDocBaseWithNewDoc<CraftHelpAttribute>(try_pending_doc);
            }

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

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

            craft_help_attrib.HelpUserGuids = HelpUserGuids.Select(x => x).ToList();
            craft_help_attrib.HelpedUserGuids = HelpedUserGuids.Select(x => x).ToList();
            craft_help_attrib.CraftHelpUpdateDay = CraftHelpUpdateDay;

            return result;
        }
    }
    public class CraftHelpAttributeTransactor : EntityAttributeTransactorBase<CraftHelpAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
    {
        public CraftHelpAttributeTransactor(EntityBase owner)
            : base(owner)
        {
        }

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

            var to_cast_string = typeof(CraftHelpAttribute).Name;

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

            var copy_to_help_attribute = getClonedEntityAttribute() as CraftHelpAttribute;
            if (null == copy_to_help_attribute)
            {
                err_msg = $"Failed to copyEntityAttributeTransactorFromEntityAttribute() !!!, copy_to_craft_help_attribute is null :{to_cast_string}";
                Log.getLogger().error(err_msg);
                return false;
            }

            copy_to_help_attribute.HelpUserGuids = copy_from_help_attribute.HelpUserGuids.Select(x => x).ToList();
            copy_to_help_attribute.HelpedUserGuids = copy_from_help_attribute.HelpedUserGuids.Select(x => x).ToList();
            copy_to_help_attribute.CraftHelpUpdateDay = copy_from_help_attribute.CraftHelpUpdateDay;

            return true;
        }
    }
}