using InABox.Core;
using System;
using System.Linq;

namespace Comal.Classes
{
    public class PurchaseOrderItemLookups : EntityLookup<PurchaseOrderItem>, ILookupDefinition<PurchaseOrderItem, BillLine>
    {
        public override Columns<PurchaseOrderItem> DefineColumns()
        {
            return new Columns<PurchaseOrderItem>(
                x => x.ID,
                x => x.PurchaseOrderLink.PONumber,
                x => x.Product.Code
            );
        }

        public override Filter<PurchaseOrderItem>? DefineFilter()
        {
            return null;
        }

        public Filter<PurchaseOrderItem> DefineFilter(BillLine[] items)
        {
            if (!items.Any())
            {
                return new Filter<PurchaseOrderItem>().None();
            }
            var supplierID = items.Select(x => x.BillLink.SupplierLink.ID).Distinct().SingleOrDefault();
            if(supplierID == Guid.Empty)
            {
                return new Filter<PurchaseOrderItem>().None();
            }
            return new Filter<PurchaseOrderItem>(x => x.PurchaseOrderLink.SupplierLink.ID).IsEqualTo(supplierID);
        }

        public Columns<BillLine> DefineFilterColumns()
        {
            return new Columns<BillLine>(x => x.BillLink.SupplierLink.ID);
        }

        public override SortOrder<PurchaseOrderItem> DefineSortOrder()
        {
            return new SortOrder<PurchaseOrderItem>(x => x.PurchaseOrderLink.PONumber).ThenBy(x => x.Created);
        }
    }
}