using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Data;

namespace FluidExplorer.Helpers;

/// <summary>bool → Visibility（ConverterParameter="invert" 可反转）。</summary>
public sealed class BoolToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        var flag = value is bool b && b;
        if (parameter is string s && s.Equals("invert", StringComparison.OrdinalIgnoreCase)) flag = !flag;
        return flag ? Visibility.Visible : Visibility.Collapsed;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => value is Visibility v && v == Visibility.Visible;
}

/// <summary>字符串非空 → Visible。</summary>
public sealed class StringToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
        => string.IsNullOrWhiteSpace(value as string) ? Visibility.Collapsed : Visibility.Visible;

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => throw new NotSupportedException();
}

/// <summary>数量 &gt; 0 → Visible。</summary>
public sealed class CountToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
        => value is int count && count > 0 ? Visibility.Visible : Visibility.Collapsed;

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => throw new NotSupportedException();
}

/// <summary>bool 取反。</summary>
public sealed class InverseBoolConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
        => value is bool b && !b;

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => value is bool b && !b;
}

/// <summary>回收站/图库等视图才显示的操作按钮。</summary>
public sealed class KindToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        var current = value?.ToString();
        var expected = parameter as string;
        return string.Equals(current, expected, StringComparison.OrdinalIgnoreCase) ? Visibility.Visible : Visibility.Collapsed;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => throw new NotSupportedException();
}

/// <summary>作业状态 → 中文文案（状态栏/队列面板用）。</summary>
public sealed class JobStateTextConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
        => value is Services.Operations.JobState state
            ? state switch
            {
                Services.Operations.JobState.Queued => "排队中",
                Services.Operations.JobState.Running => "进行中",
                Services.Operations.JobState.Paused => "已暂停",
                Services.Operations.JobState.Completed => "已完成",
                Services.Operations.JobState.CompletedWithErrors => "已完成（部分出错）",
                Services.Operations.JobState.Cancelled => "已取消",
                Services.Operations.JobState.Failed => "失败",
                _ => state.ToString()
            }
            : string.Empty;

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => throw new NotSupportedException();
}

/// <summary>作业 → 进度明细文案：条目数 / 体积 / 速度 / 剩余时间。</summary>
public sealed class JobProgressTextConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        if (value is not Services.Operations.FileOperationJob job) return string.Empty;
        var parts = new List<string> { $"{job.CompletedItems:N0} / {job.TotalItems:N0} 个项目" };
        if (job.TotalBytes > 0)
            parts.Add($"{Models.FileEntry.FormatSize(job.CompletedBytes)} / {Models.FileEntry.FormatSize(job.TotalBytes)}");
        if (job.BytesPerSecond > 1) parts.Add($"{Models.FileEntry.FormatSize((long)job.BytesPerSecond)}/s");
        if (job.Eta is { } eta && eta.TotalSeconds > 1 && eta.TotalHours < 24)
            parts.Add($"剩余 {eta:mm\\:ss}");
        if (!string.IsNullOrEmpty(job.Error)) parts.Add(job.Error!);
        return string.Join(" · ", parts);
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => throw new NotSupportedException();
}

/// <summary>作业 → 暂停/继续按钮图标。</summary>
public sealed class JobPauseGlyphConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
        => value is Services.Operations.JobState.Paused ? "\uE768" : "\uE769";

    public object ConvertBack(object value, Type targetType, object parameter, string language)
        => throw new NotSupportedException();
}