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

namespace Comal.Classes
{
    public interface IConsolidatedPurchaseOrderItem
    {
        Guid ID { get; set; }

        PurchaseOrderItemLink OrderItem { get; set; }

        JobRequisitionItemLink JobRequisitionItem { get; set; }

        JobLink Job { get; set; }

        /// <summary>
        /// Quantity of the item in "exploded" units.
        /// </summary>
        double Qty { get; set; }
    }

    /// <summary>
    /// Represents a consolidation of <see cref="PurchaseOrderItem"/> and <see cref="PurchaseOrderItemAllocation"/> into a single list.
    /// </summary>
    [AutoEntity(typeof(ConsolidatedPurchaseOrderItemGenerator))]
    public class ConsolidatedPurchaseOrderItem : Entity, IConsolidatedPurchaseOrderItem, IRemotable, IPersistent, ILicense<AccountsPayableLicense>
    {
        public PurchaseOrderItemLink OrderItem { get; set; } = null!;

        public JobRequisitionItemLink JobRequisitionItem { get; set; } = null!;

        public JobLink Job { get; set; } = null!;

        public double Qty { get; set; }

        static ConsolidatedPurchaseOrderItem()
        {
            DefaultColumns.Add<ConsolidatedPurchaseOrderItem>(x => x.OrderItem.PurchaseOrderLink.PONumber, caption: "PONumber");
            DefaultColumns.Add<ConsolidatedPurchaseOrderItem>(x => x.OrderItem.Description);
            DefaultColumns.Add<ConsolidatedPurchaseOrderItem>(x => x.OrderItem.Product.Code, caption: "Product", width: 100);
            DefaultColumns.Add<ConsolidatedPurchaseOrderItem>(x => x.OrderItem.Style.Code, caption: "Style", width: 100);
            DefaultColumns.Add<ConsolidatedPurchaseOrderItem>(x => x.OrderItem.Dimensions.UnitSize, width: 70, caption: "Size");
            DefaultColumns.Add<ConsolidatedPurchaseOrderItem>(x => x.Job.JobNumber, caption: "Job", width: 70);
            DefaultColumns.Add<ConsolidatedPurchaseOrderItem>(x => x.Qty, width: 50);
        }
    }

    public class ConsolidatedPurchaseOrderItemGenerator : AutoEntityUnionGenerator<IConsolidatedPurchaseOrderItem>
    {
        public override Column<IConsolidatedPurchaseOrderItem>[] IDColumns => new Column<IConsolidatedPurchaseOrderItem>[]
        {
            new Column<IConsolidatedPurchaseOrderItem>(x => x.ID)
        };

        protected override void Configure()
        {
            AddTable<PurchaseOrderItem>()
                .AliasField(x => x.Job.ID, x => x.Job.ID)
                .AliasField(x => x.OrderItem.ID, x => x.ID)
                .AliasField(x => x.Qty, x => x.Unallocated)
                .AddConstant(x => x.JobRequisitionItem.ID, Guid.Empty);

            AddTable<PurchaseOrderItemAllocation>()
                .AliasField(x => x.Job.ID, x => x.Job.ID)
                .AliasField(x => x.OrderItem.ID, x => x.Item.ID)
                .AliasField(x => x.Qty,
                    ComplexFormulaGenerator.If<PurchaseOrderItemAllocation, string, double>(
                        ComplexFormulaGenerator.Property<PurchaseOrderItemAllocation, string>(x => x.Item.Dimensions.Unit.Conversion),
                        Condition.Equals,
                        ComplexFormulaGenerator.Constant<PurchaseOrderItemAllocation, string>(""),
                        "")
                    .Then(ComplexFormulaGenerator.Property<PurchaseOrderItemAllocation, double>(x => x.Quantity))
                    .Else(ComplexFormulaGenerator.Formula(FormulaOperator.Divide,
                        ComplexFormulaGenerator.Property<PurchaseOrderItemAllocation, double>(x => x.Quantity),
                        ComplexFormulaGenerator.Property<PurchaseOrderItemAllocation, double>(x => x.Item.Dimensions.Value))))
                .AliasField(x => x.JobRequisitionItem.ID, x => x.JobRequisitionItem.ID);
        }

        public override bool Distinct => true;
    }
}