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


using Google.Protobuf.WellKnownTypes;
using Newtonsoft.Json;


using ServerCore; using ServerBase;
using ServerCommon.BusinessLogDomain;


using USER_GUID = System.String;
using Amazon.S3.Model;
using System.Runtime.InteropServices;


namespace ServerCommon
{
    public class ShopProductTradingMeterSubAttribute
    {
        [JsonProperty("product_id")]
        public int ProductId { get; set; }
        
        [JsonProperty("left_count")] 
        public double LeftCount { get; set; }
    }
    
    public class ShopProductTradingMeterAttribute : EntityAttributeBase, ICopyEntityAttributeFromDoc, IMergeWithEntityAttribute
    {
        private readonly USER_GUID m_user_guid; 
            
        [JsonProperty]
        public int ShopId { get; set; }

        [JsonProperty] public Timestamp EndTime { get; set; } = DateTimeHelper.MinTime.ToTimestamp();

        [JsonProperty]
        public List<ShopProductTradingMeterSubAttribute> ShopProductTradingMeterSubs { get; private set; } = new();

        [JsonProperty] public Int32 CurrentRenewalCount { get; private set; } = 0;

        public ShopProductTradingMeterAttribute( EntityBase owner, USER_GUID user_guid
                                               , EntityBase entityOfOwnerEntityType ) 
            : base(owner, entityOfOwnerEntityType)
        {
            m_user_guid = user_guid;
        }
        
        public override void onClear()
        {
            ShopId = 0;
            EndTime = DateTimeHelper.MinTime.ToTimestamp();
            ShopProductTradingMeterSubs.Clear();
            CurrentRenewalCount = 0;

            getAttributeState().reset();
        }

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

            var cloned = new ShopProductTradingMeterAttribute( getOwner()
                                                             , m_user_guid, owner_entity_type)
            {
                ShopId = ShopId,
                EndTime = EndTime,
                CurrentRenewalCount = CurrentRenewalCount
            };
            
            foreach (var sub in ShopProductTradingMeterSubs)
            {
                var data = new ShopProductTradingMeterSubAttribute
                {
                    ProductId = sub.ProductId,
                    LeftCount = sub.LeftCount
                };

                cloned.ShopProductTradingMeterSubs.Add(data);
            }

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

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


            //=====================================================================================
            // Attribute => try pending Doc
            //=====================================================================================
            var try_pending_doc = getTryPendingDocBase() as ShopProductTradingMeterDoc;
            if (null == try_pending_doc)
            {
                var to_copy_doc = new ShopProductTradingMeterDoc(m_user_guid, ShopId);

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

                to_copy_doc.onApplyPKSK();

                try_pending_doc = to_copy_doc;

                setTryPendingDocBase(try_pending_doc);
            }

            var to_copy_doc_attrib = try_pending_doc.getAttrib<ShopProductTradingMeterAttrib>();
            NullReferenceCheckHelper.throwIfNull(to_copy_doc_attrib, () => $"to_copy_doc_attrib is null !!!");

            to_copy_doc_attrib.onClear();
            to_copy_doc_attrib.ShopId = ShopId;
            to_copy_doc_attrib.EndTime = EndTime;
            to_copy_doc_attrib.CurrentRenewalCount = CurrentRenewalCount; 
            foreach (var sub in ShopProductTradingMeterSubs)
            {
                to_copy_doc_attrib.ShopProductTradingMeterSubs.Add(new ShopProductTradingMeterSubAttrib
                {
                    ProductId = sub.ProductId,
                    LeftCount = sub.LeftCount
                });
            }

            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();
            string err_msg;

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

                return result; 
            }

            onClear();

            ShopId = other_shop_product_trading_meter_attribute.ShopId;
            EndTime = other_shop_product_trading_meter_attribute.EndTime;
            CurrentRenewalCount = other_shop_product_trading_meter_attribute.CurrentRenewalCount;
            foreach (var subAttribute in other_shop_product_trading_meter_attribute.ShopProductTradingMeterSubs)
            {
                var data = new ShopProductTradingMeterSubAttribute();
                data.ProductId = subAttribute.ProductId;
                data.LeftCount = subAttribute.LeftCount;
                ShopProductTradingMeterSubs.Add(data);
            }

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

                syncOriginDocBaseWithNewDoc<ShopProductTradingMeterAttribute>(try_pending_doc);
            }

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

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

            shop_product_trading_meter_attrib.ShopId = ShopId;
            shop_product_trading_meter_attrib.EndTime = EndTime;
            shop_product_trading_meter_attrib.CurrentRenewalCount = CurrentRenewalCount; 

            foreach(var sub in ShopProductTradingMeterSubs)
            {
                var data = new ShopProductTradingMeterSubAttrib();
                data.ProductId = sub.ProductId;
                data.LeftCount = sub.LeftCount;

                shop_product_trading_meter_attrib.ShopProductTradingMeterSubs.Add(data);
            }

            return result;
        }
        
        public bool copyEntityAttributeFromDoc(DynamoDbDocBase? docBase)
        {
            if (docBase is not ShopProductTradingMeterDoc meterDoc)
            {
                var err_msg =  $"Failed to copyEntityAttributeFromDoc() !!!, shop_product_trading_meter_doc is null :{nameof(ShopProductTradingMeterDoc)}";
                Log.getLogger().error(err_msg);
                return false;
            }

            //=====================================================================================
            // New Doc => Origin Doc
            //=====================================================================================
            syncOriginDocBaseWithNewDoc<ShopProductTradingMeterAttribute>(meterDoc);

            //=====================================================================================
            // Doc => Attribute
            //=====================================================================================
            var attr = meterDoc.getAttrib<ShopProductTradingMeterAttrib>();
            if (null == attr)
            {
                var err_msg = $"Failed to copyEntityAttributeFromDocs() !!!, not found doc attrib !!! :{toBasicString()}";
                Log.getLogger().error(err_msg);
                return false;
            }

            onClear();
            ShopId = attr.ShopId;
            EndTime = attr.EndTime;
            CurrentRenewalCount = attr.CurrentRenewalCount;
            foreach (var meter in attr.ShopProductTradingMeterSubs)
            {
                var info = new ShopProductTradingMeterSubAttribute
                {
                    ProductId = meter.ProductId,
                    LeftCount = meter.LeftCount
                };

                ShopProductTradingMeterSubs.Add(info);
            }
            
            return true;
        }
        
        public Result changeProductTradingMeter(int product_id, int delta)
        {
            var result = new Result();
            string err_msg;
            
            var meter = findMeter(product_id);
            if (null == meter)
            {
                err_msg = $"Failed to found product id: {product_id}";
                result.setFail(ServerErrorCode.NotFoundProductId, err_msg);
                Log.getLogger().error(err_msg);
                return result;
            }

            var change = meter.LeftCount + delta;
            if (change < 0)
            {
                err_msg = $"Failed to change shop meter !!! : Invalid count - {meter.LeftCount} / {delta}";
                result.setFail(ServerErrorCode.InvalidArgument, err_msg);
                return result;
            }
            
            meter.LeftCount += delta;
            return result;
        }

        public ShopProductTradingMeterSubAttribute? getMeterSubAttribute(int product_id) 
            => ShopProductTradingMeterSubs.FirstOrDefault(sub => sub.ProductId == product_id);

        public void initEndTime() => EndTime = Timestamp.FromDateTime(DateTime.UtcNow);

        public void initRenewalCount() => CurrentRenewalCount = 0;

        public void increaseRenewalCount(Int32 increaseCount = 1)
        {
            CurrentRenewalCount += increaseCount;
        }

        public void setCurrentRenewalCount(Int32 currenctRenewalCount)
        {
            CurrentRenewalCount = currenctRenewalCount;
        }

        private ShopProductTradingMeterSubAttribute? findMeter(int product_id) =>
            ShopProductTradingMeterSubs.FirstOrDefault(meter => meter.ProductId == product_id);
    }
    
    public class ShopProductTradingMeterAttributeTransactor : EntityAttributeTransactorBase<ShopProductTradingMeterAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
    {
        public ShopProductTradingMeterAttributeTransactor(EntityBase owner)
            : base(owner) 
        { 
        }

        public bool copyEntityAttributeTransactorFromEntityAttribute(EntityAttributeBase entityAttributeBase)
        {
            string err_msg;

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

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

            copy_to_shop_product_trading_meter_attribute.onClear();
            copy_to_shop_product_trading_meter_attribute.ShopId = copy_from_shop_product_trading_meter_attribute.ShopId;
            copy_to_shop_product_trading_meter_attribute.EndTime = copy_from_shop_product_trading_meter_attribute.EndTime;
            copy_to_shop_product_trading_meter_attribute.setCurrentRenewalCount(copy_from_shop_product_trading_meter_attribute.CurrentRenewalCount);
            foreach (var subAttribute in copy_from_shop_product_trading_meter_attribute.ShopProductTradingMeterSubs)
            {
                var data = new ShopProductTradingMeterSubAttribute();
                data.ProductId = subAttribute.ProductId;
                data.LeftCount = subAttribute.LeftCount;
                copy_to_shop_product_trading_meter_attribute.ShopProductTradingMeterSubs.Add(data);
            }

            return true;
        }
    }
    
}