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

namespace Comal.Classes
{
    public class SupplierOrderBalance : CoreAggregate<Supplier, PurchaseOrderItem, double>
    {
        public override Expression<Func<PurchaseOrderItem, double>> Aggregate => x => x.Balance;

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;

        public override Dictionary<Expression<Func<PurchaseOrderItem, object>>, Expression<Func<Supplier, object>>> Links =>
            new Dictionary<Expression<Func<PurchaseOrderItem, object>>, Expression<Func<Supplier, object>>>()
            {
                { PurchaseOrderItem => PurchaseOrderItem.PurchaseOrderLink.SupplierLink.ID, Supplier => Supplier.ID }
            };
    }

    public class SupplierTotalBills : CoreAggregate<Supplier, BillLine, double>
    {
        public override Expression<Func<BillLine, double>> Aggregate => x => x.IncTax;

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;

        public override Dictionary<Expression<Func<BillLine, object>>, Expression<Func<Supplier, object>>> Links =>
            new Dictionary<Expression<Func<BillLine, object>>, Expression<Func<Supplier, object>>>()
            {
                { BillLine => BillLine.BillLink.SupplierLink.ID, Supplier => Supplier.ID }
            };
    }

    public class SupplierTotalPayments : CoreAggregate<Supplier, BillPayment, double>
    {
        public override Expression<Func<BillPayment, double>> Aggregate => x => x.Amount;

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;

        public override Dictionary<Expression<Func<BillPayment, object>>, Expression<Func<Supplier, object>>> Links =>
            new Dictionary<Expression<Func<BillPayment, object>>, Expression<Func<Supplier, object>>>()
            {
                { BillPayment => BillPayment.BillLink.SupplierLink.ID, Supplier => Supplier.ID }
            };
    }

    public class SupplierBalance : IFormula<Supplier, double>
    {
        public Expression<Func<Supplier, double>> Value => x => x.TotalBills;
        public Expression<Func<Supplier, double>>[] Modifiers => new Expression<Func<Supplier, double>>[] { x => x.TotalPayments };
        public FormulaOperator Operator => FormulaOperator.Subtract;
        public FormulaType Type => FormulaType.Virtual;
    }

    [UserTracking(typeof(Bill))]
    public class Supplier : Entity, IPersistent, IRemotable, ILicense<CoreLicense>, IExportable, IImportable, IMergeable
    {
        [UniqueCodeEditor(Visible = Visible.Default, Editable = Editable.Enabled)]
        public string Code { get; set; }

        [TextBoxEditor]
        public string Name { get; set; }

        [TextBoxEditor]
        public string Email { get; set; }

        public Address Delivery { get; set; }

        public Address Postal { get; set; }

        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Aggregate(typeof(SupplierOrderBalance))]
        public double OrderBalance { get; set; }

        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Aggregate(typeof(SupplierTotalBills))]
        public double TotalBills { get; set; }

        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Aggregate(typeof(SupplierTotalPayments))]
        public double TotalPayments { get; set; }

        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Formula(typeof(SupplierBalance))]
        public double Balance { get; set; }

        public StockLocationLink DefaultLocation { get; set; }

        public override string ToString()
        {
            return string.Format("{0}: {1}", Code, Name);
        }

        protected override void Init()
        {
            base.Init();
            Delivery = new Address();
            Postal = new Address();
            Email = "";
            DefaultLocation = new StockLocationLink();
        }
    }
}