using InABox.Core;
using System;
using System.Collections.Generic;
using System.Linq;

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

        public override string FormatLookup(Dictionary<string, object?> values, IEnumerable<string> exclude)
        {
            return Guid.Equals(values["ID"],Guid.Empty)
                ? ""
                : $"{values["PurchaseOrderLink.PONumber"]}: {values["Qty"]} x {values["Description"]}";
        }

        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)
                .And(x=>x.BillLine.ID).IsEqualTo(Guid.Empty);
        }

        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);
        }

        public Filter<PurchaseOrderItem>? DefineFilter(JobRequisitionItemPurchaseOrderItem[] items)
        {
            var jobs = items.Select(x => x.JobRequisitionItem.Job.ID).Distinct().ToArray();
            var products = items.Select(x => x.JobRequisitionItem.Product.ID).Distinct().ToArray();
            if(jobs.Length == 1 && products.Length == 1)
            {
                return new Filter<PurchaseOrderItem>(x => x.Job.ID).IsEqualTo(jobs.First())
                    .And(x => x.Product.ID).IsEqualTo(products.First());
            }
            {
                return new Filter<PurchaseOrderItem>().None();
            }
        }

        Columns<JobRequisitionItemPurchaseOrderItem> ILookupDefinition<PurchaseOrderItem, JobRequisitionItemPurchaseOrderItem>.DefineFilterColumns() =>
            new Columns<JobRequisitionItemPurchaseOrderItem>(x => x.JobRequisitionItem.Job.ID)
                .Add(x => x.JobRequisitionItem.Product.ID);
    }
}