using System.Globalization;
using Avalonia.Data.Converters;
using Avalonia.Media;
using ClaudeDo.Ui.ViewModels.Islands;

namespace ClaudeDo.Ui.Converters;

// One-expression converters. Each is only worth a class because Avalonia XAML can't
// instantiate a generic FuncValueConverter as a resource; they stay one per type so the
// x:Key names in App.axaml keep resolving. Anything with real logic gets its own file.

public sealed class UpperCaseConverter : OneWayConverter
{
    public static UpperCaseConverter Instance { get; } = new();
    public override object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value?.ToString()?.ToUpperInvariant();
}

public sealed class StrikeIfTrueConverter : OneWayConverter
{
    public static StrikeIfTrueConverter Instance { get; } = new();
    public override object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value is true ? TextDecorations.Strikethrough : null;
}

public sealed class BoolToItalicConverter : OneWayConverter
{
    public override object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value is true ? FontStyle.Italic : FontStyle.Normal;
}

public sealed class BoolToDraftOpacityConverter : OneWayConverter
{
    public override object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value is true ? 0.7 : 1.0;
}

// Drives ListBoxItem.Focusable for TasksIslandView's flat Rows list: a HeaderRow container must
// not be a tab stop, a TaskRowViewModel container must behave like any other row.
public sealed class NotHeaderRowConverter : OneWayConverter
{
    public static NotHeaderRowConverter Instance { get; } = new();
    public override object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        => value is not HeaderRow;
}

public abstract class OneWayConverter : IValueConverter
{
    public abstract object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture);

    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
        => throw new NotSupportedException();
}