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

namespace Comal.Classes
{

    [UserTracking(typeof(Bill))]
    [Caption("Purchase Order Items")]
    public class PurchaseOrderItem : StockEntity, IRemotable, IPersistent, IOneToMany<PurchaseOrder>, ITaxable, IOneToMany<Consignment>, IOneToMany<Job>,
        ILicense<AccountsPayableLicense>, IPostableFragment<PurchaseOrder>, IJobMaterial
    {
        
        [RequiredColumn]
        [EntityRelationship(DeleteAction.Cascade)]
        public PurchaseOrderLink PurchaseOrderLink { get; set; }
        
        [EntityRelationship(DeleteAction.SetNull)]
        [EditorSequence(1)]
        [RequiredColumn]
        public override ProductLink Product { get; set; }
        
        [EntityRelationship(DeleteAction.SetNull)]
        [EditorSequence(2)]
        public ProductStyleLink Style { get; set; }
        
        [EditorSequence(3)]
        [RequiredColumn]
        [DimensionsEditor(typeof(StockDimensions))]
        public override StockDimensions Dimensions { get; set; }

        private class AllocationsFormula : ComplexFormulaGenerator<PurchaseOrderItem, string>
        {
            public override IComplexFormulaNode<PurchaseOrderItem, string> GetFormula() =>
                Aggregate<PurchaseOrderItemAllocation>(
                        AggregateCalculation.Concat,
                        x => x.Property(x => x.Job.JobNumber))
                    .WithLink(x => x.Item.ID, x => x.ID);
        }
        [ComplexFormula(typeof(AllocationsFormula))]
        [TextBoxEditor(Visible=Visible.Optional,Editable = Editable.Hidden)]
        public string Allocations { get; set; }
        
        [EntityRelationship(DeleteAction.SetNull)]
        [EditorSequence(4)]
        public JobLink Job { get; set; }

        [MemoEditor(Visible = Visible.Default)]
        [EditorSequence(6)]
        public string Description { get; set; }
        
        [DoubleEditor(Visible = Visible.Default)]
        [EditorSequence(7)]
        public double Qty { get; set; } = 1;
        
        private class AllocatedFormula : ComplexFormulaGenerator<PurchaseOrderItem, double>
        {
            public override IComplexFormulaNode<PurchaseOrderItem, double> GetFormula() =>
                If<PurchaseOrderItem,string?,double>(
                        Property<PurchaseOrderItem,string?>(x=>x.Dimensions.Unit.Conversion),
                        Condition.Equals,
                        Constant<PurchaseOrderItem,string?>(""),
                        ""
                    )
                    .Then(
                        Aggregate<PurchaseOrderItem,PurchaseOrderItemAllocation, double>(
                            AggregateCalculation.Sum,
                            Property<PurchaseOrderItemAllocation,double>(a => a.Quantity)
                        )
                        .WithLink(x => x.Item.ID, x => x.ID)
                    )
                    .Else(
                        Aggregate<PurchaseOrderItem,PurchaseOrderItemAllocation, double>(
                            AggregateCalculation.Sum,
                            Formula(
                                    FormulaOperator.Divide,
                                    Property<PurchaseOrderItemAllocation,double>(a => a.Quantity),
                                    Property<PurchaseOrderItemAllocation,double>(a => a.Item.Dimensions.Value)
                            )
                        ).WithLink(x => x.Item.ID, x => x.ID)
                    );
        }
        
        [ComplexFormula(typeof(AllocatedFormula))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double Allocated { get; set; }
        
        private class UnallocatedFormula : ComplexFormulaGenerator<PurchaseOrderItem, double>
        {
            public override IComplexFormulaNode<PurchaseOrderItem, double> GetFormula() =>
                Formula(
                    FormulaOperator.Subtract,
                    Property(x=>x.Qty),
                    Property(x=>x.Allocated)
                );
        }
        
        [ComplexFormula(typeof(UnallocatedFormula))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double Unallocated { get; set; }
        
        
        [CurrencyEditor(Visible = Visible.Optional)]
        [EditorSequence(8)]
        public double ForeignCurrencyCost { get; set; }

        [CurrencyEditor(Visible = Visible.Default)]
        [EditorSequence(9)]
        public double Cost { get; set; }
        
        [CurrencyEditor(Visible = Visible.Default, Summary = Summary.Sum)]
        [EditorSequence(10)]
        public double ExTax { get; set; }
        
        [EditorSequence(11)]
        public TaxCodeLink TaxCode { get; set; }

        [NullEditor]
        public double TaxRate { get; set; }

        [EditorSequence(12)]
        [CurrencyEditor(Visible = Visible.Default, Summary = Summary.Sum)]
        public double Tax { get; set; }

        [EditorSequence(13)]
        [CurrencyEditor(Visible = Visible.Default, Summary = Summary.Sum)]
        public double IncTax { get; set; }
        
        [EditorSequence("Additional",1)]
        [IntegerEditor(Visible = Visible.Optional)]
        public int PORevision { get; set; }
        
        [CodeEditor(Visible = Visible.Default, Editable = Editable.Enabled)]
        [EditorSequence("Additional",2)]
        public string SupplierCode { get; set; }
        
        [EditorSequence("Additional",3)]
        public PurchaseGLCodeLink PurchaseGL { get; set; }
        
        [EditorSequence("Additional",4)]
        public CostCentreLink CostCentre { get; set; }
        
        [DateTimeEditor(Visible = Visible.Default)]
        [EditorSequence("Additional",5)]
        public DateTime DueDate { get; set; }
        
        [EditorSequence("Additional",6)]
        [EntityRelationship(DeleteAction.SetNull)]
        public ConsignmentLink Consignment { get; set; }
        
        private class ConsignmentParcelLookup : LookupDefinitionGenerator<ConsignmentParcel, PurchaseOrderItem>
        {
            public override Filter<ConsignmentParcel> DefineFilter(PurchaseOrderItem[] items)
            {
                if (items.Select(x => x.Consignment.ID).Distinct().Count() != 1)
                    return new Filter<ConsignmentParcel>().None();
                return new Filter<ConsignmentParcel>(x => x.Consignment.ID).IsEqualTo(items.FirstOrDefault()?.Consignment.ID ?? CoreUtils.FullGuid);
            }

            public override Columns<PurchaseOrderItem> DefineFilterColumns()
                => Columns.None<PurchaseOrderItem>().Add(x=>x.Consignment.ID);
        }
        [LookupDefinition(typeof(ConsignmentParcelLookup))]
        [EditorSequence("Additional",7)]
        [EntityRelationship(DeleteAction.SetNull)]
        public ConsignmentParcelLink ConsignmentParcel { get; set; }
        
        [EditorSequence("Additional",8)]   
        public StockLocationLink StockLocation { get; set; }
        
        [DateTimeEditor(Visible = Visible.Default)]
        [EditorSequence("Additional",9)]
        public DateTime ReceivedDate { get; set; }

        [TextBoxEditor(Visible = Visible.Optional)]
        [EditorSequence("Additional",10)]
        public string ReceivedReference { get; set; }
        
        [CurrencyEditor(Visible = Visible.Optional, Editable = Editable.Hidden, Summary = Summary.Sum)]
        public double Balance { get; set; }

        [Editable(Editable.Disabled)]
        [EntityRelationship(DeleteAction.SetNull)]
        public BillLineLink BillLine { get; set; }

        [NullEditor]
        public string PostedReference { get; set; }
        
        [EntityRelationship(DeleteAction.SetNull)]
        [NullEditor]
        [Obsolete("Replaced with Product", true)]
        public ProductLink ProductLink
        {
            get { return Product; }
            set { /* We cannot set the 'Product' to this value, because that would stuff the SubObject internal linking, so we do nothing instead. */ }
        }
        
        [EntityRelationship(DeleteAction.SetNull)]
        [NullEditor]
        [Obsolete("Replaced with Style", true)]
        public ProductStyleLink StyleLink
        {
            get { return Style; }
            set { /* Same as ProductLink */ }
        }
        
        
        [NullEditor]
        [Obsolete("Replaced with Dimensions", true)]
        public double UnitSize { get; set; }
        
        [NullEditor]
        [Obsolete]
        public StockMovementLink StockMovement { get; set; }
        
        [NullEditor]
        [EntityRelationship(DeleteAction.SetNull)]
        public ManufacturingPacketLink Packet { get; set; }

        private class FormCountAggregate : ComplexFormulaGenerator<PurchaseOrderItem, int>
        {
            public override IComplexFormulaNode<PurchaseOrderItem, int> GetFormula() =>
                Count<PurchaseOrderItemForm, Guid>(
                    x => x.Property(x => x.ID))
                .WithLink(x => x.Parent.ID, x => x.ID);
        }
        [NullEditor]
        [ComplexFormula(typeof(FormCountAggregate))]
        public int FormCount { get; set; }

        private class OpenFormsAggregate : ComplexFormulaGenerator<PurchaseOrderItem, int>
        {
            public override IComplexFormulaNode<PurchaseOrderItem, int> GetFormula() =>
                Count<PurchaseOrderItemForm, Guid>(
                    x => x.Property(x => x.ID),
                    new Filter<PurchaseOrderItemForm>(x => x.FormCompleted).IsEqualTo(DateTime.MinValue)
                        .Or(x => x.FormData).IsEqualTo(""))
                .WithLink(x => x.Parent.ID, x => x.ID);
        }
        [NullEditor]
        [ComplexFormula(typeof(OpenFormsAggregate))]
        public int OpenForms { get; set; }
        
        static PurchaseOrderItem()
        {
            LinkedProperties.Register<PurchaseOrderItem, ProductLink, String>(x => x.Product, x => x.Name, x => x.Description);
            
            LinkedProperties.Register<PurchaseOrderItem, TaxCodeLink, Guid>(x => x.Product.TaxCode, x => x.ID, x => x.TaxCode.ID);
            LinkedProperties.Register<PurchaseOrderItem, TaxCodeLink, String>(x => x.Product.TaxCode, x => x.Code,
                x => x.TaxCode.Code);
            LinkedProperties.Register<PurchaseOrderItem, TaxCodeLink, String>(x => x.Product.TaxCode, x => x.Description,
                x => x.TaxCode.Description);
            LinkedProperties.Register<PurchaseOrderItem, TaxCodeLink, double>(x => x.Product.TaxCode, x => x.Rate,
                x => x.TaxCode.Rate);
            LinkedProperties.Register<PurchaseOrderItem, TaxCodeLink, double>(x => x.TaxCode, x => x.Rate, x => x.TaxRate);
            
            LinkedProperties.Register<PurchaseOrderItem, PurchaseGLCodeLink, Guid>(x => x.Product.PurchaseGL, x => x.ID, x => x.PurchaseGL.ID);
            LinkedProperties.Register<PurchaseOrderItem, CostCentreLink, Guid>(x => x.Product.CostCentre, x => x.ID, x => x.CostCentre.ID);
            
            LinkedProperties.Register<PurchaseOrderItem, ProductStyleLink, Guid>(x => x.Product.DefaultInstance.Style, x => x.ID, x => x.Style.ID);
            LinkedProperties.Register<PurchaseOrderItem, ProductStyleLink, String>(x => x.Product.DefaultInstance.Style, x => x.Code, x => x.Style.Code);
            LinkedProperties.Register<PurchaseOrderItem, ProductStyleLink, String>(x => x.Product.DefaultInstance.Style, x => x.Description, x => x.Style.Description);

            LinkedProperties.Register<PurchaseOrderItem, ProductInstanceLink, double>(x => x.Product.DefaultInstance, x => x.NettCost,
                x => x.Cost);

            StockEntity.LinkStockDimensions<PurchaseOrderItem>();
            
            DefaultColumns.Add<PurchaseOrderItem>(x => x.PurchaseOrderLink.PONumber, caption: "PONumber");
            DefaultColumns.Add<PurchaseOrderItem>(x => x.Description);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.Product.Code, caption: "Product", width: 100);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.Style.Code, caption: "Style", width: 100);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.Dimensions.UnitSize, width: 70, caption: "Size");
            DefaultColumns.Add<PurchaseOrderItem>(x => x.Job.JobNumber, caption: "Job", width: 70);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.Qty, width: 50);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.Cost);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.ExTax);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.TaxCode.Code, caption: "Tax", width: 50);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.CostCentre.Code, width: 70);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.PurchaseGL.Code, width: 70);
            DefaultColumns.Add<PurchaseOrderItem>(x => x.ReceivedDate, width: 100);
        }
        
        private bool bChanging;

        protected override void DoPropertyChanged(string name, object? before, object? after)
        {
            base.DoPropertyChanged(name, before, after);
            
            if (bChanging)
                return;

            try
            {
                bChanging = true;

                if (name.Equals(nameof(Qty)) && after is double qty)
                    ExTax = qty * Cost;
                
                else if (name.Equals(nameof(ForeignCurrencyCost)) && (after is double foreigncost) && 
                         PurchaseOrderLink.SupplierLink.Currency.ID != Guid.Empty)
                {
                    Cost = foreigncost / (PurchaseOrderLink.SupplierLink.Currency.ExchangeRate.IsEffectivelyEqual(0.0) ? 1.0 : PurchaseOrderLink.SupplierLink.Currency.ExchangeRate);
                    ExTax = Qty * Cost;
                }

                else if (name.Equals(nameof(Cost)) && (after is double cost))

                {
                    ExTax = cost * Qty;
                    if (PurchaseOrderLink.SupplierLink.Currency.ID != Guid.Empty)
                        ForeignCurrencyCost = cost * (PurchaseOrderLink.SupplierLink.Currency.ExchangeRate.IsEffectivelyEqual(0.0) ? 1.0 : PurchaseOrderLink.SupplierLink.Currency.ExchangeRate);
                    
                }

                else if (name.Equals(nameof(ExTax)) && after is double extax)
                {
                    if (Qty == 0)
                        Qty = 1;
                    Cost = extax / Qty;
                    if (PurchaseOrderLink.SupplierLink.Currency.ID != Guid.Empty)
                        ForeignCurrencyCost = Cost * (PurchaseOrderLink.SupplierLink.Currency.ExchangeRate.IsEffectivelyEqual(0.0) ? 1.0 : PurchaseOrderLink.SupplierLink.Currency.ExchangeRate);
                }

                else if (name.Equals(nameof(IncTax)) && after is double inctax)
                    Balance = ReceivedDate.IsEmpty() ? inctax : 0.00F;

                else if (name.Equals(nameof(ReceivedDate)) && after is DateTime received)
                    Balance = received.IsEmpty() ? IncTax : 0.00F;
            }
            finally
            {
                bChanging = false;
            }
        }
    }
}