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

namespace Comal.Classes
{
    public interface IProduct : IEntity
    {
    }

    [UserTracking("Product Management")]
    public class Product : Entity, IPersistent, IRemotable, IIssues, ILicense<ProductManagementLicense>, IExportable, IImportable, IMergeable, IProblems<ManagedProblem>
    {
        [UniqueCodeEditor(Visible = Visible.Default, Editable = Editable.Enabled)]
        [EditorSequence(1)]
        public string Code { get; set; }

        [TextBoxEditor]
        [EditorSequence(2)]
        public string Name { get; set; } 
        
        [MemoEditor]
        [EditorSequence(3)]
        public string Notes { get; set; } 
        
        [EditorSequence(4)]
        public ProductDimensionUnitLink UnitOfMeasure { get; set; }
        
        private class ProductInstanceLookup : LookupDefinitionGenerator<ProductInstance, Product>
        {
            public override Filter<ProductInstance>? DefineFilter(Product[] items)
            {
                if (items.Length == 0)
                {
                    return new Filter<ProductInstance>().None();
                }
                else
                {
                    var filter = new Filters<ProductInstance>();
                    foreach (var item in items)
                    {
                        filter.Add(new Filter<ProductInstance>(x => x.Product.ID).IsEqualTo(item.ID));
                    }
                    return filter.Combine();
                }
            }

            public override Columns<Product> DefineFilterColumns() => Columns.None<Product>().Add(x => x.ID);
        }
        
        [LookupDefinition(typeof(ProductInstanceLookup))]
        [EditorSequence(5)]
        [RequiredColumn]
        public ProductInstanceLink DefaultInstance { get; set; }
        
        [EditorSequence(6)]
        public ProductGroupLink Group { get; set; }

        [EditorSequence(7)]
        [DataModelTableName("Image")]
        public ImageDocumentLink Image { get; set; }

        [URLEditor]
        [EditorSequence(8)]
        public string URL { get; set; }

        [TimestampEditor]
        [EditorSequence(9)]
        public DateTime Expired { get; set; }
        
        [EnumLookupEditor(typeof(ProductPricingStrategy))]
        [EditorSequence("Pricing", 1)]
        public ProductPricingStrategy PricingStrategy { get; set; } = ProductPricingStrategy.Standard;

        [EnumLookupEditor(typeof(SupplierProductOrderStrategy))]
        [EditorSequence("Pricing", 2)]
        public SupplierProductOrderStrategy OrderStrategy { get; set; }

        private class SupplierProductLookup : LookupDefinitionGenerator<SupplierProduct, Product>
        {
            public override Filter<SupplierProduct> DefineFilter(Product[] items)
            {
                var id = items != null && items.Length == 1 ? items[0].ID : CoreUtils.FullGuid;
                return new Filter<SupplierProduct>(x => x.Product.ID).IsEqualTo(id);
            }

            public override Columns<Product> DefineFilterColumns()
                => Columns.None<Product>().Add(x => x.ID);
        }
        [LookupDefinition(typeof(SupplierProductLookup))]
        [EditorSequence("Pricing", 3)]
        public ProductSupplierLink Supplier { get; set; }

        [CheckBoxEditor]
        [EditorSequence("Pricing", 4)]
        public bool UseDefaultSupplierPricing { get; set; } = true;

        [CurrencyEditor(Visible = Visible.Optional)]
        [EditorSequence("Pricing", 5)]
        public double BaseCost { get; set; }

        [Aggregate(typeof(ProductComponentCost))]
        [CurrencyEditor(Visible = Visible.Optional)] //, Editable = Editable.Disabled)]
        [EditorSequence("Pricing", 6)]
        public double ComponentCost { get; set; }

        [CurrencyEditor(Visible = Visible.Optional, Editable = Editable.Disabled)]
        [EditorSequence("Pricing", 7)]
        public double NettCost { get; set; }
        
        [Obsolete("Replaced with ProductInstance.AverageCost", true)]
        [CurrencyEditor(Visible = Visible.Optional)]
        [EditorSequence("Pricing", 8)]
        [LoggableProperty]
        public double AverageCost { get; set; }
        
        [EditorSequence("Pricing", 9)]
        [RequiredColumn]
        public TaxCodeLink TaxCode { get; set; }

        [EditorSequence("Pricing", 10)]
        [RequiredColumn]
        public PurchaseGLCodeLink PurchaseGL { get; set; }

        [EditorSequence("Pricing", 11)]
        [RequiredColumn]
        public SalesGLCodeLink SellGL { get; set; }

        [EditorSequence("Pricing", 12)]
        [RequiredColumn]
        public CostCentreLink CostCentre { get; set; }

        [EditorSequence("Pricing", 13)]
        public CostSheetSectionLink CostSheetSection { get; set; }
        
        [ProductChargeEditor]
        [EditorSequence("Pricing", 14)]
        public ProductCharge Charge { get; set; }
        
        /// <summary>
        ///     Flag to indicate whether stock movements are to be tracked for this item.
        ///     If set, no stock movements will be recorded, even if the Warehouse and/or default location are set.
        /// </summary>
        [CheckBoxEditor]
        [EditorSequence("Warehousing", 1)]
        public bool NonStock { get; set; } = false;

        /// <summary>
        ///     The Warehouse that this item resides in. DefaultLocation Lookups are limited to this Warehouse only, although
        ///     actual stock holdings can be anywhere (imperfect systems)
        /// </summary>
        [EditorSequence("Warehousing", 2)]
        public StockWarehouseLink Warehouse { get; set; }

        private class StockLocationLookup : LookupDefinitionGenerator<StockLocation, Product>
        {
            // If there are multiple items, they must be all in the same warehouse
            public override Filter<StockLocation> DefineFilter(Product[] items)
            {
                var warehouses = items.Select(x => x.Warehouse.ID).Distinct().ToArray();
                if (warehouses.Length == 1)
                    return new Filter<StockLocation>(x => x.Active).IsEqualTo(true).And(x => x.Warehouse.ID).IsEqualTo(warehouses.First());
                return new Filter<StockLocation>(x => x.ID).IsEqualTo(CoreUtils.FullGuid);
            }

            public override Columns<Product> DefineFilterColumns()
                => Columns.None<Product>().Add(x => x.Warehouse.ID);
        }
        [LookupDefinition(typeof(StockLocationLookup))]
        /// <summary>
        ///     (Optional) The Location to be used when Purchase Orders / Consignments are received.
        ///     If blank, the item will be received into the default location for the Warehouse assign to the product
        ///     If that is also blank, then no stock movement will be recorded when receiving the item
        /// </summary>
        [EditorSequence("Warehousing", 4)]
        public StockLocationLink DefaultLocation { get; set; }

        private class ProductFormLookups : LookupDefinitionGenerator<DigitalForm, Product>
        {
            public override Filter<DigitalForm> DefineFilter(Product[] items)
            {
                // Get all FillableFormTypes where 2nd parameter is typeof(PurchaseOrder)
                return new Filter<DigitalForm>(x => x.Active).IsEqualTo(true).And(x => x.AppliesTo).IsEqualTo("PurchaseOrderItem");
            }

            public override Columns<Product> DefineFilterColumns()
                => Columns.None<Product>();
        }
        [Caption("Incoming QA")]
        [EditorSequence("Warehousing", 5)]
        public DigitalFormLink DigitalForm { get; set; }
        
        [Caption("Mfg Treatment?")]
        //[EditorSequence("Warehousing", 6)]
        [NullEditor]
        [Obsolete("Replaced with TreatmentType", true)]
        public bool IsManufacturingTreatment { get; set; }

        private class TreatmentTypeLookup : LookupDefinitionGenerator<TreatmentType, Product>
        {
            public override Filter<TreatmentType>? DefineFilter(Product[] items)
            {
                return new Filter<TreatmentType>(x => x.Active).IsEqualTo(true);
            }

            public override Columns<TreatmentType> DefineColumns()
            {
                return base.DefineColumns().Add(x => x.Description);
            }
            public override string FormatDisplay(CoreRow row)
            {
                return row.Get<TreatmentType, string>(x => x.Description);
            }
        }
        [LookupDefinition(typeof(TreatmentTypeLookup))]
        [EditorSequence("Warehousing", 6)]
        public TreatmentTypeLink TreatmentType { get; set; }
        
        [NullEditor]
        public string Barcodes { get; set; }

        [Aggregate(typeof(ProductUnitAggregate))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double UnitQty { get; set; }

        [Aggregate(typeof(ProductRemnantAggregate))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double RemnantQty { get; set; }

        [Aggregate(typeof(OnOrderAggregate))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double OnOrder { get; set; }

        [Aggregate(typeof(TotalStockAggregate))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double TotalStock { get; set; }

        [Formula(typeof(ReservedStockFormula))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double ReservedStock { get; set; }

        [Aggregate(typeof(FreeStockAggregate))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double FreeStock { get; set; }

        [Aggregate(typeof(TotalRequiredAggregate))]
        [DoubleEditor(Editable = Editable.Hidden)]
        public double Required { get; set; }

        [Aggregate(typeof(ProductReceivedAggregate))]
        [DateTimeEditor(Editable = Editable.Hidden)]
        public DateTime LastReceived { get; set; }

        [Aggregate(typeof(ProductIssuedAggregate))]
        [DateTimeEditor(Editable = Editable.Hidden)]
        public DateTime LastIssued { get; set; }

        [Obsolete("Replaced with DefaultInstance.Style")]
        [NullEditor]
        public ProductStyleLink DefaultStyle { get; set; }

        [Obsolete("Replaced with DefaultInstance.MinimumStockLevel")]
        [NullEditor]
        public int MinimumStockLevel { get; set; }

        [Obsolete("Replaced with DefaultInstance.Dimensions")]
        [NullEditor]
        public ProductDimensions Dimensions { get; set; }
        
                
        [NullEditor]
        [Obsolete("Replaced with Dimensions", true)]
        // [DoubleEditor]
        // [EditorSequence(4)]
        public double UnitSize { get; set; }

        [NullEditor]
        [Obsolete("Replaced with Dimensions", false)]
        // [EditorSequence(5)]
        public ProductUOMLink Units { get; set; }
        
        [NullEditor]
        [Obsolete("Replaced with Dimensions", true)]
        // [DoubleEditor]
        // [EditorSequence(6)]
        // [Caption("Standard Weight")]
        public double Weight { get; set; }
        
        [NullEditor]
        [Obsolete("Replaced with Problem", true)]
        public string Issues { get; set; }
        
        [EditorSequence("Issues", 1)]
        public ManagedProblem Problem { get; set; }

        public override string ToString()
        {
            return string.Format("{0}: {1} ({2})", Code, Name, DefaultInstance.Dimensions.UnitSize);
        }
        
        public static double CalculateNettCost(ProductPricingStrategy strategy, double basecost, double componentcost)
        {
            if (strategy == ProductPricingStrategy.Kit)
                return basecost + componentcost;
            if (strategy == ProductPricingStrategy.Subcontractor)
                return basecost - componentcost;
            // Standard or Assembly
            return basecost;
        }
    }

    public class FreeStockAggregate : CoreAggregate<Product, StockMovement, double>
    {
        public override Expression<Func<StockMovement, double>> Aggregate => x => x.Qty;

        public override Filter<StockMovement> Filter => new Filter<StockMovement>(x => x.Job).NotLinkValid();

        public override Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>>()
            {
                { StockMovement => StockMovement.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }

    public class OnOrderAggregate : CoreAggregate<Product, PurchaseOrderItem, double>
    {
        public override Expression<Func<PurchaseOrderItem, double>> Aggregate => x => x.Qty;

        //public Expression<Func<PurchaseOrderItem, Guid>> Link => x => x.ProductLink.ID;

        public override Dictionary<Expression<Func<PurchaseOrderItem, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<PurchaseOrderItem, object?>>, Expression<Func<Product, object?>>>()
            {
                { PurchaseOrderItem => PurchaseOrderItem.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }

    public class ProductReceivedAggregate : CoreAggregate<Product, StockMovement, DateTime>
    {
        public override Expression<Func<StockMovement, DateTime>> Aggregate => x => x.Date;

        public override Filter<StockMovement> Filter =>
            new Filter<StockMovement>(x => x.Type).IsEqualTo(StockMovementType.Receive);

        public override Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>>()
            {
                { StockMovement => StockMovement.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Maximum;
    }

    public class ProductRemnantAggregate : CoreAggregate<Product, StockMovement, double>
    {
        public override Expression<Func<StockMovement, double>> Aggregate => x => x.Units;

        public override Filter<StockMovement> Filter => new Filter<StockMovement>(x => x.IsRemnant).IsEqualTo(true);

        public override Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>>()
            {
                { StockMovement => StockMovement.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }

    public class ProductUnitAggregate : CoreAggregate<Product, StockMovement, double>
    {
        public override Expression<Func<StockMovement, double>> Aggregate => x => x.Units;

        public override Filter<StockMovement> Filter => new Filter<StockMovement>(x => x.IsRemnant).IsEqualTo(false);

        public override Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>>()
            {
                { StockMovement => StockMovement.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }

    public class ReservedStockFormula : IFormula<Product, double>
    {
        public Expression<Func<Product, double>> Value => x => x.TotalStock;
        public Expression<Func<Product, double>>[] Modifiers => new Expression<Func<Product, double>>[] { x => x.FreeStock };
        public FormulaOperator Operator => FormulaOperator.Subtract;
        public FormulaType Type => FormulaType.Virtual;
    }

    public class StockShortageFormula : IFormula<Product, double>
    {
        public Expression<Func<Product, double>> Value => x => x.TotalStock;
        public Expression<Func<Product, double>>[] Modifiers => new Expression<Func<Product, double>>[] { x => x.Required };
        public FormulaOperator Operator => FormulaOperator.Subtract;
        public FormulaType Type => FormulaType.Virtual;
    }

    public class TotalRequiredAggregate : CoreAggregate<Product, JobRequisitionItem, double>
    {
        public override Expression<Func<JobRequisitionItem, double>> Aggregate => x => x.TotalQty;

        public override Dictionary<Expression<Func<JobRequisitionItem, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<JobRequisitionItem, object?>>, Expression<Func<Product, object?>>>()
            {
                { JobMaterialRequisitionItem => JobMaterialRequisitionItem.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }

    public class TotalStockAggregate : CoreAggregate<Product, StockMovement, double>
    {
        public override Expression<Func<StockMovement, double>> Aggregate => x => x.Qty;

        public override Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>>()
            {
                { StockMovement => StockMovement.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }
    public class ProductIssuedAggregate : CoreAggregate<Product, StockMovement, DateTime>
    {
        public override Expression<Func<StockMovement, DateTime>> Aggregate => x => x.Date;

        public override Filter<StockMovement> Filter =>
            new Filter<StockMovement>(x => x.Type).IsEqualTo(StockMovementType.Issue);

        public override Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object?>>, Expression<Func<Product, object?>>>()
            {
                { StockMovement => StockMovement.Product.ID, Product => Product.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Maximum;
    }
}