using System.Linq;
using Comal.Classes;
using InABox.Core;
using System;

namespace Comal.Stores
{
    internal class BillLineStore : BaseStore<BillLine>
    {
        protected override void AfterSave(BillLine entity)
        {
            base.BeforeSave(entity);
            
            if (entity.OrderItem.HasOriginalValue(x => x.ID))
            {
                Filter<PurchaseOrderItem> filter = (entity.OrderItem.ID != Guid.Empty)
                    ? new Filter<PurchaseOrderItem>(x => x.ID).IsEqualTo(entity.OrderItem.ID)
                    : new Filter<PurchaseOrderItem>(x => x.ID).IsEqualTo(entity.OrderItem.GetOriginalValue(x => x.ID));
                
                var items = Provider.Query(
                    filter,
                    Columns.Required<PurchaseOrderItem>().Add(x => x.ID).Add(x=>x.BillLine.ID)
                ).Rows.Select(x=>x.ToObject<PurchaseOrderItem>()).ToArray();

                foreach (var item in items)
                    item.BillLine.ID = entity.OrderItem.ID != Guid.Empty ? entity.ID : Guid.Empty;
                Provider.Save(items);

            }
            
            // Actually, we don't want to do this, because we will lose the ability to do a delta between
            // Order values and Bill values (to identify price creep)
            
            // A more useful idea would be to update linked product/stock costings when receiving a bill,
            // although we need to be careful about how we manage side effects for average costs etc.. 
            
            // var pitems = Provider.Query(
            //     new Filter<PurchaseOrderItem>(x => x.ID).IsEqualTo(entity.OrderItem.ID),
            //     new Columns<PurchaseOrderItem>(
            //         x => x.ID,
            //         x => x.ExTax,
            //         x => x.TaxCode.ID,
            //         x => x.TaxRate,
            //         x => x.IncTax,
            //         x => x.Balance,
            //         x => x.ReceivedDate
            //     )
            // ).Rows.Select(x => x.ToObject<PurchaseOrderItem>()).ToArray();
            // foreach (var pitem in pitems)
            // {
            //     pitem.ExTax = entity.ExTax;
            //     pitem.TaxCode.ID = entity.TaxCode.ID;
            //     pitem.TaxRate = entity.TaxRate;
            //     pitem.IncTax = entity.IncTax;
            //     pitem.Balance = pitem.ReceivedDate.IsEmpty() ? pitem.IncTax : 0.00F;
            // }
            //
            // FindSubStore<PurchaseOrderItem>().Save(pitems.Where(x => x.IsChanged()), "Updated by Bill Modification");
        }
    }
}