using Avalonia;
using Avalonia.Controls;
using Avalonia.Data;
using Avalonia.Data.Converters;
using Avalonia.Markup.Xaml;
using Avalonia.Markup.Xaml.MarkupExtensions;
using System;
using System.Collections.Generic;
using System.Globalization;

namespace ShakerApp
{
    /// <summary>
    /// 多语言绑定时使用，没有其他任何功能
    /// </summary>
    public class ResourceBindingExtensions
    {
        public static readonly AttachedProperty<object?> BindingExtensionProperty = AvaloniaProperty.RegisterAttached<Control, object?>("BindingExtension", typeof(Control), defaultValue: null);
        public static object? GetBindingExtension(Control control) => control.GetValue(BindingExtensionProperty);
        public static void SetBindingExtension(Control control, object? value) => control.SetValue(BindingExtensionProperty, value);
    }
    public class ResourceBinding : MarkupExtension
    {
        private PathConverter converter = new PathConverter();

        public ResourceBinding(string path)
        {
            this.Path = path;
        }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            var provideValueTargetService = (IProvideValueTarget)serviceProvider.GetService(typeof(IProvideValueTarget))!;

            var targetObject = provideValueTargetService.TargetObject as Control;
            var targetProperty = provideValueTargetService.TargetProperty as AvaloniaProperty;
            if (targetObject == null || targetProperty == null) return null;
            Binding binding = new Binding()
            {
                Path = Path,
                Converter = converter,
                ConverterParameter = new KeyValuePair<Control,AvaloniaProperty>(targetObject,targetProperty),
                Mode = BindingMode.OneWay,
                UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
            };
            targetObject.Bind(ResourceBindingExtensions.BindingExtensionProperty, binding);

            return null;
        }

        /// <summary>
        /// The source path (for CLR bindings).
        /// </summary>
        public string Path { get; set; }

        private class PathConverter : IValueConverter
        {
            public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
            {
                if (parameter is KeyValuePair<Control, AvaloniaProperty> p && value is string v)
                {
                    p.Key.Bind(p.Value, new DynamicResourceExtension(v));
                }
                return "";
            }

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

    }
}