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


using Newtonsoft.Json;


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 Amazon.S3.Model;


namespace ServerCommon
{
    public class LevelAttribute : EntityAttributeBase, ICopyEntityAttributeFromDoc, IMergeWithEntityAttribute
    {
        [JsonProperty]
        public UInt64 Exp
        {
            get { return m_exp; }
            set
            {
                var recorder = getEntityRecorder();
                if(null != recorder) 
                {
                    recorder.applyDeltaCounter(EntityDeltaType.UserExp, (Int64)(value - m_exp), (Int64)value);
                }

                m_exp = value;
            }
        }
        private UInt64 m_exp = 0;


        [JsonProperty]
        public UInt32 Level
        {
            get { return m_level; }
            set
            {
                var recorder = getEntityRecorder();
                if (null != recorder)
                {
                    recorder.applyDeltaCounter(EntityDeltaType.UserLevel, value - m_level, value);
                }
                m_level = value;
            }
        }
        private UInt32 m_level = 0;



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

        public override void onClear()
        {
            Exp = 0;
            Level = 0;

            getAttributeState().reset();
        }

        public override EntityAttributeBase onCloned()
        {
            var cloned = new LevelAttribute(getOwner());
            cloned.Exp = Exp;
            cloned.Level = Level;

            return cloned;
        }

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

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

            USER_GUID user_guid = user_attribute.UserGuid;

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

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

            to_copy_doc_attrib.Exp = Exp;
            to_copy_doc_attrib.Level = Level;

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

                return result;
            }

            Exp = level_attribute.Exp;
            Level = level_attribute.Level;

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

                syncOriginDocBaseWithNewDoc<LevelAttribute>(try_pending_doc);
            }

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

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

            level_attrib.Exp = Exp;
            level_attrib.Level = Level;

            return result;
        }

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

            var to_cast_string = typeof(LevelDoc).Name;

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

            //=====================================================================================
            // New Doc => Origin Doc
            //=====================================================================================
            syncOriginDocBaseWithNewDoc<LevelAttribute>(level_doc_base);

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

            Exp = doc_attrib.Exp;
            Level = doc_attrib.Level;

            return true;
        }
    }

    public class LevelAttributeTransactor : EntityAttributeTransactorBase<LevelAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
    {
        public LevelAttributeTransactor(EntityBase owner)
            : base(owner)
        {
        }

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

            var to_cast_string = typeof(LevelAttribute).Name;

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

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

            copy_to_level_attribute.Exp = copy_from_level_attribute.Exp;
            copy_to_level_attribute.Level = copy_from_level_attribute.Level;

            return true;
        }
    }
}