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

namespace Comal.Classes
{
    public class BillExTax : CoreAggregate<Bill, BillLine, double>
    {
        public override Expression<Func<BillLine, double>> Aggregate => x => x.ExTax;

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;

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

    public class BillTax : CoreAggregate<Bill, BillLine, double>
    {
        public override Expression<Func<BillLine, double>> Aggregate => x => x.Tax;

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;

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

    public class BillIncTax : CoreAggregate<Bill, 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<Bill, object>>> Links =>
            new Dictionary<Expression<Func<BillLine, object>>, Expression<Func<Bill, object>>>()
            {
                { BillLine => BillLine.BillLink.ID, Bill => Bill.ID }
            };
    }

    public class BillAmountPaid : CoreAggregate<Bill, 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<Bill, object>>> Links =>
            new Dictionary<Expression<Func<BillPayment, object>>, Expression<Func<Bill, object>>>()
            {
                { BillPayment => BillPayment.BillLink.ID, Bill => Bill.ID }
            };
    }

    public class BillBalance : IFormula<Bill, double>
    {
        public Expression<Func<Bill, double>> Value => x => x.IncTax;
        public Expression<Func<Bill, double>>[] Modifiers => new Expression<Func<Bill, double>>[] { x => x.AmountPaid };
        public FormulaOperator Operator => FormulaOperator.Subtract;
        public FormulaType Type => FormulaType.Virtual;
    }

    public class BillDocumentCount : CoreAggregate<Bill, BillDocument, Guid>
    {
        public override Expression<Func<BillDocument, Guid>> Aggregate => x => x.ID;

        public override AggregateCalculation Calculation => AggregateCalculation.Count;

        public override Dictionary<Expression<Func<BillDocument, object>>, Expression<Func<Bill, object>>> Links =>
            new Dictionary<Expression<Func<BillDocument, object>>, Expression<Func<Bill, object>>>()
            {
                { BillDocument => BillDocument.EntityLink.ID, Bill => Bill.ID }
            };
    }
}