using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Numerics;
using System.Threading;
using System.Threading.Tasks;
using static System.Net.Mime.MediaTypeNames;


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


using ServerCore;
using ServerBase;


using USER_GUID = System.String;
using META_ID = System.UInt32;


namespace ServerCommon;

public class CartAttribute : EntityAttributeBase, ICopyEntityAttributeFromDoc, IMergeWithEntityAttribute
{
    [JsonProperty]
    public Dictionary<CurrencyType, Dictionary<META_ID/*ItemMetaID*/, Int32/*Count*/>> CartItems { get; set; } = new();        

    public CartAttribute(EntityBase owner, EntityBase entityOfOwnerEntityType)
        : base(owner, entityOfOwnerEntityType)
    {
        var currencyTypes = EnumHelper.getValues<CurrencyType>();
        foreach (var currencyType in currencyTypes)
        {
            CartItems.TryAdd(currencyType, new());
        }
    }

    public override void onClear()
    {
        foreach (var value in CartItems.Values)
        {
            value.Clear();
        }

        getAttributeState().reset();
    }

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

        return new CartAttributeTransactor(player);
    }

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

        var entity_of_owner_entity_type = getEntityOfOwnerEntityType();
        NullReferenceCheckHelper.throwIfNull(entity_of_owner_entity_type, () => $"entity_of_owner_entity_type is null !!!");

        var cloned = new CartAttribute(owner, entity_of_owner_entity_type);
        cloned.CartItems = CartItems.ToDictionary(x => x.Key, y => new Dictionary<META_ID, Int32>(y.Value.ToDictionary(x => x.Key, y => y.Value)));

        return cloned;
    }

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

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

        var acoount_attribute = owner.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 CartDoc;
        if (null == try_pending_doc)
        {
            var to_copy_doc = new CartDoc(user_guid);

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

        to_copy_doc_attrib.CartItems = CartItems.ToDictionary(x => x.Key, y => new Dictionary<META_ID, Int32>(y.Value.ToDictionary(x => x.Key, y => y.Value)));

        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(CartDoc).Name;

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

        //=====================================================================================
        // New Doc => Origin Doc
        //=====================================================================================
        syncOriginDocBaseWithNewDoc<CartAttribute>(cart_doc_base);

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

        CartItems = doc_attrib.CartItems.ToDictionary(x => x.Key, y => new Dictionary<META_ID, Int32>(y.Value.ToDictionary(x => x.Key, y => y.Value)));

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

            return result;
        }

        CartItems = cart_attribute.CartItems.ToDictionary(x => x.Key, y => new Dictionary<META_ID, Int32>(y.Value.ToDictionary(x => x.Key, y => y.Value)));

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

            syncOriginDocBaseWithNewDoc<CartAttribute>(try_pending_doc);
        }

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

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

        cart_attrib.CartItems = CartItems.ToDictionary(x => x.Key, y => new Dictionary<META_ID, Int32>(y.Value.ToDictionary(x => x.Key, y => y.Value)));

        return result;
    }
}

public class CartAttributeTransactor : EntityAttributeTransactorBase<CartAttribute>, ICopyEntityAttributeTransactorFromEntityAttribute
{
    public CartAttributeTransactor(UserBase owner)
        : base(owner)
    {
    }

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

        var to_cast_string = typeof(CartAttribute).Name;

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

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

        copy_to_cart_attribute.CartItems = copy_from_cart_attribute.CartItems.ToDictionary(x => x.Key, y => new Dictionary<META_ID, Int32>(y.Value.ToDictionary(x => x.Key, y => y.Value)));
        return true;
    }
}