// Copyright (c) 2024- schick Informatik
// Description: Helpers to display localized Enum values in Comboboxes
// https://stackoverflow.com/questions/29658721/enum-in-wpf-comboxbox-with-localized-names
//

using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Markup;

namespace BreCalClient
{

    #region class EnumToStringConverter

    public sealed class EnumToStringConverter : IValueConverter
    {
        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null)
            { return null; }

            return Resources.Resources.ResourceManager.GetString(value.ToString() ?? "");            
        }

        public object? ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string str = (string)value;

            foreach (object enumValue in Enum.GetValues(targetType))
            {
                if (str == Resources.Resources.ResourceManager.GetString(enumValue.ToString() ?? ""))
                { return enumValue; }
            }
            return null;
        }
    }

    #endregion

    #region class EnumerateExtension

    public sealed class EnumerateExtension : MarkupExtension
    {
        public Type Type { get; set; }

        public EnumerateExtension(Type type)
        {
            this.Type = type;
        }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            string[] names = Enum.GetNames(Type);

            // skip value "0" == "Unknown" (we dont want this selectable in the Combobox)
            // NOTE: This will only work in the future if the first element is always "undefined" aka unused

            string[] values = new string[names.Length - 1];
            for (int i = 0; i < names.Length - 1; i++) 
            { 
                values[i] = Resources.Resources.ResourceManager.GetString(names[i + 1]) ?? names[i]; 
            }

            return values;
        }
    }

    #endregion

}