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

namespace Comal.Classes
{

    // public class StockHoldingViewQtyAggregate : CoreAggregate<StockHolding, double>
    // {
    //     public override Expression<Func<StockHolding, double>> Aggregate => x => x.Qty;
    //     public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    // }    
    //
    // public class StockHoldingViewUnitsFormula : IFormula<StockHoldingView, double>
    // {
    //     public Expression<Func<StockHoldingView, double>> Value => x => x.Qty;
    //
    //     public Expression<Func<StockHoldingView, double>>[] Modifiers => new Expression<Func<StockHoldingView, double>>[] { x => x.Dimensions.Value };
    //
    //     public FormulaOperator Operator => FormulaOperator.Divide;
    // }
    //
    // public class StockHoldingViewIsRemnantCondition : ICondition<StockHoldingView, double, object>
    // {
    //     public Expression<Func<StockHoldingView, double>> Left => x => x.Dimensions.Value;
    //
    //     public Condition Condition => Condition.LessThan;
    //
    //     public Expression<Func<StockHoldingView, double>> Right => x => x.Product.Dimensions.Value;
    //
    //     public Expression<Func<StockHoldingView, object>> True => x => true;
    //
    //     public Expression<Func<StockHoldingView, object>> False => x => null;
    // }
    //
    // public class StockHoldingView : Entity, IRemotable, IPersistent, IView<StockMovement, IStockHolding>, IStockHolding
    // {
    //     public ProductLink Product { get; set; }
    //     
    //     public ProductStyleLink Style { get; set; }
    //     
    //     public StockLocationLink Location { get; set; }
    //     
    //     public JobLink Job { get; set; }
    //     
    //     public StockDimensions Dimensions { get; set; }
    //
    //     [Condition(typeof(StockHoldingViewIsRemnantCondition))]
    //     public bool IsRemnant { get; set; }
    //
    //     [Aggregate(typeof(StockHoldingViewQtyAggregate))]
    //     public double Qty { get; set; }
    //     
    //     [Formula(typeof(StockHoldingViewUnitsFormula))]
    //     public double Units { get; set; }
    //     
    //     protected override void Init()
    //     {
    //         base.Init();
    //         Product = new ProductLink();
    //         Location = new StockLocationLink();
    //         Job = new JobLink();
    //         Style = new ProductStyleLink();
    //         Dimensions = new StockDimensions();
    //     }        
    // }

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

        public override Dictionary<Expression<Func<StockMovement, object>>, Expression<Func<StockHolding, object>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object>>, Expression<Func<StockHolding, object>>>()
            {
                { StockMovement => StockMovement.Product.ID, StockHolding => StockHolding.Product.ID },
                { StockMovement => StockMovement.Job.ID, StockHolding => StockHolding.Job.ID },
                { StockMovement => StockMovement.Location.ID, StockHolding => StockHolding.Location.ID },
                { StockMovement => StockMovement.Style.ID, StockHolding => StockHolding.Style.ID },
                { StockMovement => StockMovement.Dimensions.UnitSize, StockHolding => StockHolding.Dimensions.UnitSize }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }

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

        public override Dictionary<Expression<Func<StockMovement, object>>, Expression<Func<StockHolding, object>>> Links =>
            new Dictionary<Expression<Func<StockMovement, object>>, Expression<Func<StockHolding, object>>>()
            {
                { StockMovement => StockMovement.Product.ID, StockHolding => StockHolding.Product.ID },
                { StockMovement => StockMovement.Job.ID, StockHolding => StockHolding.Job.ID },
                { StockMovement => StockMovement.Location.ID, StockHolding => StockHolding.Location.ID },
                { StockMovement => StockMovement.Style.ID, StockHolding => StockHolding.Style.ID },
                { StockMovement => StockMovement.Dimensions.UnitSize, StockHolding => StockHolding.Dimensions.UnitSize }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Sum;
    }

    public class StockHoldingWeightFormula : IFormula<StockHolding, double>
    {
        public Expression<Func<StockHolding, double>> Value => x => x.Qty;

        public Expression<Func<StockHolding, double>>[] Modifiers => new Expression<Func<StockHolding, double>>[] { x => x.Dimensions.Weight };

        public FormulaOperator Operator => FormulaOperator.Multiply;
        
        public FormulaType Type => FormulaType.Virtual;
    }

    public class StockHoldingIsRemnantCondition : ICondition<StockHolding, double, object>
    {
        public Expression<Func<StockHolding, double>> Left => x => x.Dimensions.Value;

        public Condition Condition => Condition.LessThan;

        public Expression<Func<StockHolding, double>> Right => x => x.Product.Dimensions.Value;

        public Expression<Func<StockHolding, object>> True => x => true;

        public Expression<Func<StockHolding, object>> False => x => null;
        
        public ConditionType Type => ConditionType.Virtual;
    }
    
    public class StockHoldingUnionGenerator : AutoEntityUnionGenerator<IStockHolding>
    {
        protected override void Configure()
        {
            AddTable<StockMovement>();
        }

        public override bool Distinct => true;

        public override Column<IStockHolding>[] IDColumns => new Column<IStockHolding>[]
        {
            new Column<IStockHolding>(x => x.Job.ID),
            new Column<IStockHolding>(x => x.Location.ID),
            new Column<IStockHolding>(x => x.Product.ID),
            new Column<IStockHolding>(x => x.Style.ID),
            new Column<IStockHolding>(x => x.Dimensions.Unit.ID),
            new Column<IStockHolding>(x => x.Dimensions.Quantity),
            new Column<IStockHolding>(x => x.Dimensions.Length),
            new Column<IStockHolding>(x => x.Dimensions.Width),
            new Column<IStockHolding>(x => x.Dimensions.Height),
            new Column<IStockHolding>(x => x.Dimensions.Weight),
        };
    }
    
    [UserTracking(typeof(StockMovement))]
    [AutoEntity(typeof(StockHoldingUnionGenerator))]
    public class StockHolding : StockEntity, IRemotable, IPersistent, IOneToMany<StockLocation>, IOneToMany<Product>, 
        IStockHolding, ILicense<WarehouseLicense>
    {
        
        public override ProductLink Product { get; set; }

        public ProductStyleLink Style { get; set; }

        public StockLocationLink Location { get; set; }

        public JobLink Job { get; set; }

        [RequiredColumn]
        [DimensionsEditor(typeof(StockDimensions), AllowEditingUnit = false)]
        public override StockDimensions Dimensions { get; set; }

        [Condition(typeof(StockHoldingIsRemnantCondition))]
        public bool IsRemnant { get; set; }
        
        [Aggregate(typeof(StockHoldingUnitAggregate))]
        [DoubleEditor(Editable = Editable.Disabled)]
        public double Units { get; set; }
        
        [Aggregate(typeof(StockHoldingQuantityAggregate))]
        [DoubleEditor(Editable = Editable.Disabled)]
        public double Qty { get; set; }
        
        [Formula(typeof(StockHoldingWeightFormula))]
        public double Weight { get; set; }
        
        //[DoubleEditor(Editable = Editable.Disabled)]
        /*[NullEditor]
        [Obsolete("Replaced with Dimensions", true)]
        public double UnitSize { get; set; }*/
        
        protected override void Init()
        {
            base.Init();
            Location = new StockLocationLink();
            Job = new JobLink();
            Style = new ProductStyleLink();
        }
    }
}