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

namespace Comal.Classes
{
    public enum InvoiceType
    {
        Standard,
        ProgressClaim
    }

    [UserTracking("Accounts Receivable")]
    public class Invoice : Entity, IPersistent, IRemotable, INumericAutoIncrement<Invoice>, ILicense<AccountsReceivableLicense>, IExportable, IPostable
    {
        [EditorSequence(1)]
        [IntegerEditor(Visible = Visible.Default, Editable = Editable.Enabled)]
        public int Number { get; set; }

        [EditorSequence(2)]
        [DateEditor(Visible = Visible.Default, TodayVisible = true)]
        public DateTime Date { get; set; } = DateTime.Today;

        [EditorSequence(3)]
        [MemoEditor(Visible = Visible.Default)]
        public string Description { get; set; }

        [EditorSequence(4)]
        public JobLink JobLink { get; set; }

        [EditorSequence(5)]
        [RequiredColumn]
        public CustomerLink CustomerLink { get; set; }

        private class ClaimedFormula : ComplexFormulaGenerator<Invoice, double>
        {
            public override IComplexFormulaNode<Invoice, double> GetFormula() =>
                Aggregate<InvoiceLine>(AggregateCalculation.Sum, x => x.Property(x => x.ExTax))
                    .WithLink(x => x.InvoiceLink.ID, x => x.ID);
        }
        [EditorSequence(6)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [ComplexFormula(typeof(ClaimedFormula))]
        public double Claimed { get; set; }
        
        [EditorSequence(7)]
        [CurrencyEditor(Summary = Summary.Sum)]
        public double Retained { get; set; }
        
        private class ExTaxFormula : ComplexFormulaGenerator<Invoice, double>
        {
            public override IComplexFormulaNode<Invoice, double> GetFormula() =>
                Formula(FormulaOperator.Subtract, Property(x => x.Claimed), Property(x => x.Retained));
        }
        [EditorSequence(8)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [ComplexFormula(typeof(ExTaxFormula))]
        public double ExTax { get; set; }

        private class TaxFormula : ComplexFormulaGenerator<Invoice, double>
        {
            public override IComplexFormulaNode<Invoice, double> GetFormula() =>
                Aggregate<InvoiceLine>(AggregateCalculation.Sum, x => x.Property(x => x.Tax))
                    .WithLink(x => x.InvoiceLink.ID, x => x.ID);
        }
        [EditorSequence(9)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [ComplexFormula(typeof(TaxFormula))]
        public double Tax { get; set; }

        private class IncTaxFormula : ComplexFormulaGenerator<Invoice, double>
        {
            public override IComplexFormulaNode<Invoice, double> GetFormula() =>
                Aggregate<InvoiceLine>(AggregateCalculation.Sum, x => x.Property(x => x.IncTax))
                    .WithLink(x => x.InvoiceLink.ID, x => x.ID);
        }
        [EditorSequence(10)]
        [CurrencyEditor(Visible = Visible.Default, Editable = Editable.Hidden, Summary = Summary.Sum)]
        [ComplexFormula(typeof(IncTaxFormula))]
        public double IncTax { get; set; }

        private class AmountPaidFormula : ComplexFormulaGenerator<Invoice, double>
        {
            public override IComplexFormulaNode<Invoice, double> GetFormula() =>
                Aggregate<InvoiceReceipt>(AggregateCalculation.Sum, x => x.Property(x => x.Amount))
                    .WithLink(x => x.InvoiceLink.ID, x => x.ID);
        }
        [EditorSequence(11)]
        [CurrencyEditor(Editable = Editable.Hidden)]
        [ComplexFormula(typeof(AmountPaidFormula))]
        public double AmountPaid { get; set; }

        private class BalanceFormula : ComplexFormulaGenerator<Invoice, double>
        {
            public override IComplexFormulaNode<Invoice, double> GetFormula() =>
                Formula(FormulaOperator.Subtract, Property(x => x.IncTax), Property(x => x.AmountPaid));
        }
        /// <summary>
        /// Balance = <see cref="IncTax"/> - <see cref="AmountPaid"/>.
        /// </summary>
        [EditorSequence(12)]
        [CurrencyEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        [ComplexFormula(typeof(BalanceFormula))]
        public double Balance { get; set; }
        
        [EditorSequence(13)]
        [LookupDefinition(typeof(AccountsReceivablePaymentTermsLookup<Invoice>))]
        [RequiredColumn]
        public PaymentTermsLink Terms { get; set; }
        
        [EditorSequence(14)]
        [DateEditor(Visible = Visible.Default, TodayVisible = true)]
        public DateTime DueDate { get; set; } = DateTime.Today;
        
        [EditorSequence(15)]
        public SalesGLCodeLink SellGL { get; set; }
        
        [NullEditor]
        [LoggableProperty]
        [RequiredColumn]
        public PostedStatus PostedStatus { get; set; } = PostedStatus.NeverPosted;

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

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

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

        public Expression<Func<Invoice, int>> AutoIncrementField()
        {
            return x => x.Number;
        }

        public Filter<Invoice>? AutoIncrementFilter()
        {
            return null;
        }

        public override string ToString()
        {
            return string.Format("{0}: {1}", Number, Description);
        }
        
        private static string DATE = CoreUtils.GetFullPropertyName<Invoice, DateTime>(x => x.Date, ".");
        private static string CUSTOMERLINKTERMSCALCULATION = CoreUtils.GetFullPropertyName<Invoice, String>(x => x.CustomerLink.Terms.Calculation, ".");
        private static string TERMSCALCULATION = CoreUtils.GetFullPropertyName<Invoice, String>(x => x.Terms.Calculation, ".");
        private static string AMOUNTPAID = CoreUtils.GetFullPropertyName<Invoice, double>(x => x.AmountPaid, ".");
        private static string INCTAX = CoreUtils.GetFullPropertyName<Invoice, double>(x => x.IncTax, ".");
        
        protected override void DoPropertyChanged(string name, object? before, object? after)
        {
            base.DoPropertyChanged(name, before, after);
            if (name.Equals(AMOUNTPAID))
                Balance = IncTax - (double)(after ?? 0.0);
            else if (name.Equals(INCTAX))
                Balance = (double)(after ?? 0.0) - AmountPaid;
            else if (name.Equals(DATE))
                DueDate =  CalculateTerms((DateTime)(after ?? ""),Terms.Calculation);
            else if (name.Equals(TERMSCALCULATION))
                DueDate =  CalculateTerms(Date, (string)(after ?? ""));
        }

        private DateTime CalculateTerms(DateTime date, string calculation)
        {
            if (string.IsNullOrWhiteSpace(calculation))
                return date;

            var model = new PaymentTermsCalculationModel { Date = date };
            
            var expr = new CoreExpression<PaymentTermsCalculationModel, DateTime>(calculation);
            if(expr.Evaluate(model).Get(out var eval, out var e))
            {
                return eval;
            }
            else
            {
                Logger.Send(LogType.Information, "", $"Error in Formula: [{calculation}] ({e.Message})");
                return date;
            }
        }

        static Invoice()
        {
            LinkedProperties.Register<Invoice,PaymentTermsLink,Guid>(x=>x.CustomerLink.Terms,x=>x.ID, x=>x.Terms.ID);
            LinkedProperties.Register<Invoice,PaymentTermsLink,String>(x=>x.CustomerLink.Terms,x=>x.Code, x=>x.Terms.Code);
            LinkedProperties.Register<Invoice,PaymentTermsLink,String>(x=>x.CustomerLink.Terms,x=>x.Description, x=>x.Terms.Description);
            LinkedProperties.Register<Invoice,PaymentTermsLink,String>(x=>x.CustomerLink.Terms,x=>x.Calculation, x=>x.Terms.Calculation);
            LinkedProperties.Register<Invoice,SalesGLCodeLink,Guid>(x=>x.CustomerLink.GLCode,x=>x.ID, x=>x.SellGL.ID);
        }
        
    }
}