namespace Microsoft.Maui.Controls.Design
{
	using System;
	using System.ComponentModel;
	using System.Linq;
 
	public abstract class KnownValuesDesignTypeConverter : TypeConverter
	{
		protected abstract string[] KnownValues { get; }
 
		protected virtual bool ExclusiveToKnownValues { get; } = false;
 
		// This tells XAML this converter can be used to process strings
		// Without this the values won't show up as hints
		public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
			=> sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
 
		public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
			=> new(KnownValues);
 
		public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
			=> ExclusiveToKnownValues;
 
		public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
			=> true;
 
		public override bool IsValid(ITypeDescriptorContext context, object value)
		{
			if (!ExclusiveToKnownValues)
				return true;
 
			return KnownValues.Any(v => value?.ToString()?.Equals(v, StringComparison.Ordinal) ?? false);
		}
	}
}