using System;
using System.ComponentModel;
using System.Globalization;

namespace DTS.Common.Classes.DSP
{
    /// <summary>
    /// this converter is used to display DSPFilterCollection in a property grid
    /// </summary>
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Minor Code Smell", "S101:Types should be named in PascalCase", Justification = "Acronym")]
    public class DSPFilterConverter : ArrayConverter
    {
        private DSPFilterCollection _collection = null;
        private static readonly object MyLock = new object();
        private DSPFilterType[] _values = null;
        private DSPFilterCollection GetCollection()
        {
            lock (MyLock)
            {
                if (null == _collection)
                {
                    _collection = DSPFilterCollection.GetDSPFilterCollection();
                }
                return _collection;
            }
        }
        public DSPFilterType [] Values
        {
            get
            {
                lock (MyLock)
                {
                    if (null == _values)
                    {
                        var collection = GetCollection();

                        var array = new DSPFilterType[collection.Count];
                        collection.CopyTo(array, 0);
                        _values = array;
                    }
                }
                return _values;
            }
        }
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (sourceType == typeof(string)) { return true; }
            return base.CanConvertFrom(context, sourceType);
        }
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            var result = Array.Find(Values, x => x.DisplayString == (string)value);
            if (result != null) { return result; }
            return base.ConvertFrom(context, culture, value);
        }
        public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
        {
            return true;
        }
        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
        {
            return true;
        }
        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
        {
            var collection = GetCollection();
            return new StandardValuesCollection(collection);
        }
    }
}