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


using Newtonsoft.Json;


using ServerCore; using ServerBase;


using USER_GUID = System.String;
using RESERVATION_GUID = System.String;


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

        [JsonProperty]
        public TaskReservationActionType ReservationType { get; set; } = TaskReservationActionType.None;

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

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

        public override void onClear()
        {
            ReservationGuid = string.Empty;
            ReservationType = TaskReservationActionType.None;
            JsonValue = string.Empty;

            getAttributeState().reset();
        }

        public override IEntityAttributeTransactor onNewEntityAttributeTransactor()
        {
            var user_base = getOwner().getRootParent() as UserBase;
            NullReferenceCheckHelper.throwIfNull(user_base, () => $"user_base is null !!!");

            return new TaskReservationAttributeTransactor(user_base);
        }

        public override EntityAttributeBase onCloned()
        {
            var user_base = getOwner().getRootParent() as UserBase;
            NullReferenceCheckHelper.throwIfNull(user_base, () => $"user_base is null !!!");

            var entity_type = getEntityOfOwnerEntityType();
            NullReferenceCheckHelper.throwIfNull(entity_type, () => "Entity Type is null");

            var cloned = new TaskReservationAttribute(user_base, entity_type);
            cloned.ReservationGuid = ReservationGuid;
            cloned.ReservationType = ReservationType;
            cloned.JsonValue = JsonValue;

            return cloned;
        }

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

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

            var acoount_attribute = owner.getEntityAttribute<AccountAttribute>();
            NullReferenceCheckHelper.throwIfNull(acoount_attribute, () => $"acoount_attribute is null !!! - {owner.toBasicString()}");

            USER_GUID user_guid = acoount_attribute.UserGuid;

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

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

                try_pending_doc = to_copy_doc;

                setTryPendingDocBase(try_pending_doc);
            }

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

            take_reservation_attrib.ReservationGuid = ReservationGuid;
            take_reservation_attrib.ReservationType = ReservationType;
            take_reservation_attrib.JsonValue = JsonValue;

            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 root_parent = getOwner().getRootParent();
            NullReferenceCheckHelper.throwIfNull(root_parent, () => $"root_parent is null !!!");

            var err_msg = string.Empty;

            var to_cast_string = typeof(TaskReservationDoc).Name;

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

            //=====================================================================================
            // New Doc => Origin Doc
            //=====================================================================================
            syncOriginDocBaseWithNewDoc<TaskReservationAttribute>(task_reservation_doc_base);

            //=====================================================================================
            // Doc => Attribute
            //=====================================================================================
            var task_reservation_attrib = task_reservation_doc_base.getAttrib<TaskReservationAttrib>();
            NullReferenceCheckHelper.throwIfNull(task_reservation_attrib, () => $"task_reservation_attrib is null !!! - {root_parent.toBasicString()}");

            ReservationGuid = task_reservation_attrib.ReservationGuid;
            ReservationType = task_reservation_attrib.ReservationType;
            JsonValue = task_reservation_attrib.JsonValue;

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

                return result;
            }

            ReservationGuid = task_reservation_attribute.ReservationGuid;
            ReservationType = task_reservation_attribute.ReservationType;
            JsonValue = task_reservation_attribute.JsonValue;

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

                syncOriginDocBaseWithNewDoc<TaskReservationAttribute>(try_pending_doc);
            }

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

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

            task_reservation_attrib.ReservationGuid = ReservationGuid;
            task_reservation_attrib.ReservationType = ReservationType;
            task_reservation_attrib.JsonValue = JsonValue;

            return result;
        }
    }

    public class TaskReservationAttributeTransactor : EntityAttributeTransactorBase<TaskReservationAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
    {
        public TaskReservationAttributeTransactor(UserBase owner)
            : base(owner)
        {
        }

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

            var to_cast_string = typeof(TaskReservationAttribute).Name;

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

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

            copy_to_attribute.ReservationGuid = copy_from_attribute.ReservationGuid;
            copy_to_attribute.ReservationType = copy_from_attribute.ReservationType;
            copy_to_attribute.JsonValue = copy_from_attribute.JsonValue;

            return true;
        }
    }
}