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

namespace VideoDownloader.App;

/// <summary>컬렉션 카운트 → 빈 상태 표시용 (0일 때 Visible)</summary>
public class InverseCountToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        => (value is int i && i > 0) ? Visibility.Collapsed : Visibility.Visible;

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

/// <summary>다운로드 상태 문자열 → 표시 여부. parameter="done" 이면 완료일 때만 Visible(UC-A11 완료 아이콘).</summary>
public class StatusToVisibilityConverter : IValueConverter
{
    public static readonly StatusToVisibilityConverter Done = new();

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        => value is string s && s == "완료" ? Visibility.Visible : Visibility.Collapsed;

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

/// <summary>UC-D10 세그먼트 진행도(0~1) → 블록 배경색(진행 중 강조/대기 트랙).</summary>
public class SegmentFillConverter : IValueConverter
{
    public static readonly SegmentFillConverter Instance = new();

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        => value is double d && d >= 1.0
            ? System.Windows.Media.Brushes.DodgerBlue
            : value is double p && p > 0
                ? (System.Windows.Media.Brush)System.Windows.Application.Current.FindResource("AccentBrush")
                : (System.Windows.Media.Brush)System.Windows.Application.Current.FindResource("TrackBrush");

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