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

namespace CursorLang.Views;

/// <summary>
/// Shows an element when the value matches one of those listed in the parameter,
/// separated by commas. Needed so that the anchor point settings and the screen
/// settings are not shown at the same time.
/// </summary>
public sealed class EnumToVisibilityConverter : IValueConverter
{
    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
    {
        string? current = value?.ToString();
        bool matches = parameter?.ToString()?
            .Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries)
            .Any(expected => expected == current) ?? false;

        return matches ? Visibility.Visible : Visibility.Collapsed;
    }

    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) =>
        Binding.DoNothing;
}

/// <summary>
/// A colour into a "#RRGGBB" notation: the alpha is not shown, because
/// transparency is a separate setting.
/// </summary>
public sealed class ColorToHexConverter : IValueConverter
{
    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture) =>
        value is Color color ? $"#{color.R:X2}{color.G:X2}{color.B:X2}" : string.Empty;

    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) =>
        Binding.DoNothing;
}

/// <summary>
/// A colour into a brush — for the palette swatches in the list.
/// </summary>
public sealed class ColorToBrushConverter : IValueConverter
{
    public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture) =>
        value is Color color ? new SolidColorBrush(color) : Brushes.Transparent;

    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) =>
        value is SolidColorBrush brush ? brush.Color : Binding.DoNothing;
}