LazyBearWorks/LazyBear.MCP/TUI/Components/LogsTab.razor

@using LazyBear.MCP.Services.Logging

<Rows>
    <Markup Content="Runtime Logs" Foreground="@UiPalette.Text" Decoration="@Spectre.Console.Decoration.Bold" />
    <Markup Content="Left/Right change level. Up/Down move. PageUp/PageDown/Home/End scroll." Foreground="@UiPalette.TextMuted" />
    <Markup Content=" " />

    <Columns>
        @foreach (var filter in Filters)
        {
            var isActive = string.Equals(filter, SelectedFilter, StringComparison.Ordinal);
            <Markup Content="@($" {filter} ")"
                    Foreground="@(isActive ? UiPalette.SelectionForeground : UiPalette.Text)"
                    Background="@(isActive ? UiPalette.AccentSoft : UiPalette.SurfaceMuted)"
                    Decoration="@(isActive ? Spectre.Console.Decoration.Bold : Spectre.Console.Decoration.None)" />
            <Markup Content=" " />
        }
    </Columns>

    <Markup Content=" " />

    @if (Entries.Count == 0)
    {
        <Border BorderColor="@UiPalette.Frame" BoxBorder="@Spectre.Console.BoxBorder.Rounded" Padding="@(new Spectre.Console.Padding(0, 0, 0, 0))">
            <Markup Content="No log entries yet." Foreground="@UiPalette.TextDim" />
        </Border>
    }
    else
    {
        <Select TItem="int"
                Options="@GetOptions()"
                Value="@GetNormalizedIndex()"
                FocusedValue="@GetNormalizedIndex()"
                Formatter="@FormatEntry"
                Expand="true"
                BorderStyle="@Spectre.Console.BoxBorder.Rounded"
                SelectedIndicator="@('>')" />
    }

    <Markup Content=" " />
    <Markup Content="@GetDetailsHeader()" Foreground="@UiPalette.TextMuted" />
    <Markup Content="@GetDetailsText()" Foreground="@UiPalette.Text" />
</Rows>

@code {
    private static readonly string[] Filters = ["All", "Info", "Warn", "Error"];

    [Parameter, EditorRequired] public IReadOnlyList<LogEntry> Entries { get; set; } = Array.Empty<LogEntry>();
    [Parameter] public int SelectedIndex { get; set; }
    [Parameter] public EventCallback<int> SelectedIndexChanged { get; set; }
    [Parameter] public string SelectedFilter { get; set; } = "All";
    [Parameter] public int ViewportRows { get; set; } = 5;
    [Parameter] public bool IsStickyToBottom { get; set; }

    private int[] GetOptions() => Enumerable.Range(0, Entries.Count).ToArray();

    private int GetNormalizedIndex() => Entries.Count == 0 ? 0 : Math.Clamp(SelectedIndex, 0, Entries.Count - 1);

    private string GetDetailsHeader()
    {
        if (Entries.Count == 0)
        {
            return $"Filter: {SelectedFilter}";
        }

        var selected = Entries[Math.Clamp(SelectedIndex, 0, Entries.Count - 1)];
        var position = Math.Clamp(SelectedIndex, 0, Entries.Count - 1) + 1;
        var sticky = IsStickyToBottom ? "sticky" : "manual";
        return $"{position}/{Entries.Count} | {selected.Timestamp:HH:mm:ss} | {selected.Level} | {selected.ShortCategory} | {sticky}";
    }

    private string GetDetailsText()
    {
        if (Entries.Count == 0)
        {
            return "Incoming log entries will appear here.";
        }

        var selected = Entries[Math.Clamp(SelectedIndex, 0, Entries.Count - 1)];
        var details = string.IsNullOrWhiteSpace(selected.Exception)
            ? selected.Message
            : $"{selected.Message} | {selected.Exception}";

        return Fit(details, Math.Max(Console.WindowWidth - 12, 32));
    }

    private static Spectre.Console.Color GetLevelColor(LogEntry entry) => entry.Level switch
    {
        LogLevel.Error or LogLevel.Critical => UiPalette.Danger,
        LogLevel.Warning => UiPalette.Warning,
        LogLevel.Information => UiPalette.Text,
        _ => UiPalette.TextMuted
    };

    private string FormatEntry(int index)
    {
        var entry = Entries[index];
        var level = entry.Level switch
        {
            LogLevel.Error => "ERR",
            LogLevel.Critical => "CRT",
            LogLevel.Warning => "WRN",
            LogLevel.Information => "INF",
            LogLevel.Debug => "DBG",
            _ => "TRC"
        };

        var text = $"{entry.Timestamp:HH:mm:ss}  {level,-3}  {entry.ShortCategory,-18}  {entry.Message}";
        return Fit(text, Math.Max(Console.WindowWidth - 12, 32));
    }

    private static string Fit(string text, int width)
    {
        if (width <= 0)
        {
            return string.Empty;
        }

        if (text.Length <= width)
        {
            return text.PadRight(width);
        }

        if (width <= 3)
        {
            return text[..width];
        }

        return text[..(width - 3)] + "...";
    }
}