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

namespace Melskin.Converters;

/// <summary>
/// 比较两个值是否相等的多值转换器。
/// </summary>
public class ComparisionConverter : IMultiValueConverter
{
    /// <summary>
    /// ComparisionConverter 类的唯一实例，用于比较两个值是否相等。此静态实例遵循单例模式，确保在整个应用程序中仅创建一次该转换器对象。
    /// </summary>
    public static readonly ComparisionConverter Instance = new();

    /// <inheritdoc />
    public object Convert(object[]? values, System.Type targetType, object parameter, CultureInfo culture)
    {
        if (values == null || values.Length < 2 || values.Any(v => v == null || v == DependencyProperty.UnsetValue))
        {
            return false;
        }
        return values[0].Equals(values[1]);
    }

    /// <inheritdoc />
    public object[] ConvertBack(object value, System.Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}