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

namespace Comal.Classes
{
    public class StockLocationLookups : EntityLookup<StockLocation>, ILookupDefinition<StockLocation, Product>,
        ILookupDefinition<StockLocation, RequisitionItem>
    {
        // If there are multiple items, they must be all in the same warehouse
        public Filter<StockLocation> DefineFilter(Product[] items)
        {
            var warehouses = items.Select(x => x.Warehouse.ID).Distinct().ToArray();
            if (warehouses.Length == 1)
                return new Filter<StockLocation>(x => x.Active).IsEqualTo(true).And(x => x.Warehouse.ID).IsEqualTo(warehouses.First());
            return new Filter<StockLocation>(x => x.ID).IsEqualTo(CoreUtils.FullGuid);
        }

        Columns<Product> ILookupDefinition<StockLocation, Product>.DefineFilterColumns()
            => new Columns<Product>(x => x.Warehouse.ID);

        public Filter<StockLocation> DefineFilter(RequisitionItem[] items)
        {
            var productid = items.Select(x => x.Product.ID).FirstOrDefault();
            var styleid = items.Select(x => x.Style.ID).FirstOrDefault();
            var unitsize = items.Select(x => x.Dimensions.UnitSize).FirstOrDefault();
            var result = new Filter<StockLocation>(x => x.ID).InQuery<StockHolding>(
                new Filter<StockHolding>(x => x.Product.ID).IsEqualTo(productid)
                    .And(x=>x.Style.ID).IsEqualTo(styleid)
                    .And(x=>x.Dimensions.UnitSize).IsEqualTo(unitsize)
                    .And(x => x.Qty).IsGreaterThan(0.0F),
                x => x.Location.ID);
            return result;
        }

        Columns<RequisitionItem> ILookupDefinition<StockLocation, RequisitionItem>.DefineFilterColumns()
            => new Columns<RequisitionItem>(x => x.Product.ID).Add(x => x.Style.ID);

        public override Columns<StockLocation> DefineColumns()
        {
            return new Columns<StockLocation>
            (
                x => x.ID,
                x => x.Code,
                x => x.Area.Warehouse.Description,
                x => x.Area.Description,
                x => x.Description
            );
        }

        public override Filter<StockLocation> DefineFilter()
        {
            return new Filter<StockLocation>(x => x.Active).IsEqualTo(true);
        }

        public override SortOrder<StockLocation> DefineSortOrder()
        {
            return new SortOrder<StockLocation>(x => x.Code);
        }
    }
}