using System;
using InABox.Core;

namespace Comal.Classes
{
    [UserTracking(typeof(Invoice))]
    public class InvoiceLine : Entity, IPersistent, IRemotable, ISequenceable, IOneToMany<Invoice>, ITaxable, ILicense<AccountsReceivableLicense>
    {
        [NullEditor]
        [EntityRelationship(DeleteAction.Cascade)]
        public InvoiceLink InvoiceLink { get; set; }

        [MemoEditor]
        [EditorSequence(1)]
        public string Description { get; set; }

        [EditorSequence(2)]
        [DoubleEditor]
        public double Quantity { get; set; } = 1.0F;

        [EditorSequence(3)]
        [CurrencyEditor]
        public double Amount { get; set; }
        
        [EditorSequence(4)]
        [DoubleEditor(Summary = Summary.Sum)]
        public double ExTax { get; set; }

        [EditorSequence(5)]
        public TaxCodeLink TaxCode { get; set; }
        
        [EditorSequence(6)]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double TaxRate { get; set; }
        
        [EditorSequence(7)]
        [DoubleEditor(Editable = Editable.Hidden, Summary = Summary.Sum)]
        public double Tax { get; set; }
        
        [EditorSequence(8)]
        [DoubleEditor(Summary = Summary.Sum)]
        public double IncTax { get; set; }
        
        private class JobScopeLookup : LookupDefinitionGenerator<JobScope, InvoiceLine>
        {
            public override Filter<JobScope> DefineFilter(InvoiceLine[] items)
            {
                if (items == null)
                    return new Filter<JobScope>(x => x.ID).IsEqualTo(CoreUtils.FullGuid);
                var jobid = CoreUtils.FullGuid;
                foreach (var item in items)
                {
                    if (jobid == CoreUtils.FullGuid)
                        jobid = item.InvoiceLink.JobLink.ID;

                    if (item.InvoiceLink.JobLink.ID != jobid)
                        return new Filter<JobScope>(x => x.ID).IsEqualTo(CoreUtils.FullGuid);
                }

                return new Filter<JobScope>(x => x.Job.ID).IsEqualTo(jobid).And(x => x.Status.Approved).IsEqualTo(true);
            }
            
            public override Columns<InvoiceLine> DefineFilterColumns()
                => new Columns<InvoiceLine>(x => x.InvoiceLink.JobLink.ID);
        }
        [LookupDefinition(typeof(JobScopeLookup))]
        [EditorSequence(9)]
        public JobScopeLink Scope { get; set; }
        
        [EditorSequence(10)]
        public CostCentreLink CostCentre { get; set; }
        
        [NullEditor]
        public long Sequence { get; set; }

        static InvoiceLine()
        {
            LinkedProperties.Register<InvoiceLine, TaxCodeLink, double>(x => x.TaxCode, x => x.Rate, x => x.TaxRate);
        }

        private enum Suppress
        {
            This
        }
        
        protected override void DoPropertyChanged(string name, object? before, object? after)
        {

            base.DoPropertyChanged(name, before, after);
            
            if (EventSuppressor.IsSet(Suppress.This))
                return;
            
            using (new EventSuppressor(Suppress.This))
            {
                if (String.Equals(name, nameof(Quantity)))
                    ExTax = (double)after * Amount;
                else if (String.Equals(name, nameof(Amount)))
                    ExTax = (double)after * Quantity;
                else if (String.Equals(name, nameof(ExTax)))
                    Amount = (double)after / (Quantity == 0.0F ? 1.0F : Quantity);
                
            }
        }
    } 
}