/// <summary>
///     Diagnostic overlay that displays real-time lazy parsing stats for a
///     <see cref = "MokaJsonViewer"/>. Add this component alongside your viewer
///     and set <see cref = "Enabled"/> to control visibility.
/// </summary>
public sealed partial class MokaJsonDebugOverlay : ComponentBase
{
    /// <summary>
    ///     The viewer instance to read debug stats from.
    /// </summary>
    [Parameter]
    public MokaJsonViewer? Viewer { get; set; }

    /// <summary>
    ///     Whether the overlay is visible. Default is <c>true</c>.
    /// </summary>
    [Parameter]
    public bool Enabled { get; set; } = true;
    private LazyDebugStats? Stats => Viewer?.DebugStats;
    private string CacheHitRateClass => Stats?.CacheHitRate switch
    {
        >= 80 => "moka-json-debug-good",
        >= 50 => "moka-json-debug-warn",
        _ => "moka-json-debug-bad"
    };

    private static string FormatBytes(long bytes) => bytes switch
    {
        < 1024 => $"{bytes} B",
        < 1024 * 1024 => $"{bytes / 1024.0:F1} KB",
        < 1024L * 1024 * 1024 => $"{bytes / (1024.0 * 1024):F1} MB",
        _ => $"{bytes / (1024.0 * 1024 * 1024):F2} GB"};
    private static string FormatMs(TimeSpan ts) => ts.TotalMilliseconds < 1 ? $"{ts.TotalMicroseconds:F0}us" : $"{ts.TotalMilliseconds:F1}ms";
    private static string TruncatePath(string path, int max = 30) => path.Length <= max ? path : "..." + path[^(max - 3)..];
}