using Comal.Classes;
using InABox.Core;
using InABox.Scripting;

namespace PRSDimensionUtils;

public static class DimensionUtils
{ 
    private static Dictionary<Guid, ScriptDocument>? _dimensionscriptcache;
    
    public static void ResetDimensionScriptCache() => _dimensionscriptcache = null;
         
    public static void ReloadDimensionScriptCache(Guid[]? ids, Func<Filter<ProductDimensionUnit>?,Columns<ProductDimensionUnit>,CoreTable> reload)
    {

        _dimensionscriptcache ??= new Dictionary<Guid, ScriptDocument>();

        var scripts = reload(
            ids != null
                ? new Filter<ProductDimensionUnit>(x => x.ID).InList(ids)
                : null,
            Columns.None<ProductDimensionUnit>()
                .Add(x => x.ID)
                .Add(x => x.Conversion)
        ).ToDictionary<ProductDimensionUnit, Guid, String>(x => x.ID, x => x.Conversion);

    
        foreach (var id in scripts.Keys)
        {
            var doc = !String.IsNullOrWhiteSpace(scripts[id]) ? new ScriptDocument(scripts[id]) : null;
            if (doc?.Compile() == true)
                _dimensionscriptcache[id] = doc;
            else
                _dimensionscriptcache.Remove(id);
        }
    }
    public static void ReloadDimensionScriptCache(Guid[]? ids, IQueryProvider<ProductDimensionUnit> query)
    {
        ReloadDimensionScriptCache(ids, (f, c) => query.Query(f, c));
    }

    public static void ConvertDimensions(
        IDimensions dimensions,
        ref double quantity,
        IQueryProvider<ProductDimensionUnit> reload) => ConvertDimensions(dimensions, ref quantity, (f, c) => reload.Query(f, c));
    
    public static void ConvertDimensions(
        IDimensions dimensions,
        ref double quantity,
        Func<Filter<ProductDimensionUnit>?,Columns<ProductDimensionUnit>,CoreTable> reload)
    {
        if (_dimensionscriptcache == null)
            ReloadDimensionScriptCache(null, reload);
        
        if (_dimensionscriptcache?.TryGetValue(dimensions.Unit.ID, out ScriptDocument? script) == true)
        {
            script.SetValue("Quantity", quantity);
            script.SetValue("Dimensions", dimensions);
            script.Execute("Module", DimensionUnit.ConvertDimensionsMethodName());
            quantity = Convert.ToDouble(script.GetValue("Quantity"));
        }
    }

    public static double ConvertDimensions(IDimensions dimensions, double quantity, Func<Filter<ProductDimensionUnit>?, Columns<ProductDimensionUnit>, CoreTable> reload)
    {
        ConvertDimensions(dimensions, ref quantity, reload);
        return quantity;
    }
    public static double ConvertDimensions(IDimensions dimensions, double quantity, IQueryProvider<ProductDimensionUnit> query)
    {
        ConvertDimensions(dimensions, ref quantity, query);
        return quantity;
    }

    /// <summary>
    /// Convert the dimensions on a <see cref="PurchaseOrderItem"/>, and adjust
    /// its <see cref="PurchaseOrderItem.Cost"/> and <see
    /// cref="PurchaseOrderItem.Qty"/> accordingly.
    /// </summary>
    public static void ConvertDimensions(this PurchaseOrderItem entity, IQueryProvider<ProductDimensionUnit> query)
    {
        var dimensions = entity.Dimensions;
        var qty = entity.Qty;
        ConvertDimensions(
            dimensions, 
            ref qty,
            query);
        if (!qty.IsEffectivelyEqual(entity.Qty))
        {
            entity.Cost = entity.Cost * entity.Qty / (qty.IsEffectivelyEqual(0.0) ? 1.0 : qty);
            entity.Qty = qty;
        }
    }
}