using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Runtime.InteropServices;
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, IPostable,
        IPostableFragment<Bill>, IPostableFragment<PurchaseOrder>
    {
        [UniqueCodeEditor(Visible = Visible.Default, Editable = Editable.Enabled)]
        [EditorSequence(1)]
        public string Code { get; set; }

        [TextBoxEditor]
        [EditorSequence(2)]
        public string Name { get; set; }
        
        [EditorSequence(3)]
        public String ABN { get; set; }

        [TextBoxEditor]
        [EditorSequence(4)]
        public string Email { get; set; } = "";

        [TextBoxEditor]
        [EditorSequence(5)]
        public string Telephone { get; set; } = "";
        
        [EditorSequence(6)]
        public SupplierStockLocationLink DefaultLocation { get; set; }
        
        [EditorSequence(7)]
        public SupplierCategoryLink Category { get; set; }

        [EditorSequence(8)]
        public SupplierStatusLink SupplierStatus { get; set; }

        [EditorSequence("Delivery",1)]
        public Address Delivery { get; set; }
        
        [EditorSequence("Accounts",2)]
        public Address Postal { get; set; }
        
        [EditorSequence("Accounts",3)]
        public ForeignCurrencyLink Currency { get; set; }
        
        [EditorSequence("Accounts", 4)]
        [LookupDefinition(typeof(AccountsPayablePaymentTermsLookup<Supplier>))]
        public PaymentTermsLink Terms { get; set; }
        
        [EditorSequence("Accounts", 5)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Aggregate(typeof(SupplierOrderBalance))]
        public double OrderBalance { get; set; }

        [EditorSequence("Accounts", 6)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Aggregate(typeof(SupplierTotalBills))]
        public double TotalBills { get; set; }

        [EditorSequence("Accounts", 7)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Aggregate(typeof(SupplierTotalPayments))]
        public double TotalPayments { get; set; }

        [EditorSequence("Accounts", 8)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [Formula(typeof(SupplierBalance))]
        public double Balance { get; set; }

        [NullEditor]
        public DateTime Posted { get; set; }

        [NullEditor]
        [RequiredColumn]
        public PostedStatus PostedStatus { get; set; }

        [NullEditor]
        public string PostedNote { get; set; }

        [NullEditor]
        public string PostedReference { get; set; }

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

        
    }
}