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

namespace AIPractice.LabellerServer.WPF
{
    [MarkupExtensionReturnType(typeof(IValueConverter))]
    public class BoolToVisibleConverter : MarkupExtension, IValueConverter
    {
        public static BoolToVisibleConverter Converter { get; private set; }

        static BoolToVisibleConverter()
        {
            Converter = new BoolToVisibleConverter();
        }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return Converter ?? (Converter = new BoolToVisibleConverter());
        }

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                var b = (bool)value;
                return b ? Visibility.Visible : Visibility.Collapsed;
            }
            return Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }


    [MarkupExtensionReturnType(typeof(IValueConverter))]
    public class LabelNameConverter : MarkupExtension, IValueConverter
    {
        public static LabelNameConverter Converter { get; private set; }

        static LabelNameConverter()
        {
            Converter = new LabelNameConverter();
        }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return Converter ?? (Converter = new LabelNameConverter());
        }

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                var name = (string)value;
                return string.IsNullOrEmpty(name) ? "默认标签" : name;
            }
            return "默认标签";
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}