using Serilog.Core;
using Serilog.Events;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Controls;

namespace SharepointToolbox.Infrastructure.Logging;

/// <summary>
/// Custom Serilog sink that writes timestamped, color-coded entries to a WPF RichTextBox.
/// Format: HH:mm:ss [LEVEL] Message — green=info/success, orange=warning, red=error.
/// All writes dispatch to the UI thread via Application.Current.Dispatcher.
/// </summary>
public class LogPanelSink : ILogEventSink
{
    private readonly RichTextBox _richTextBox;

    public LogPanelSink(RichTextBox richTextBox)
    {
        _richTextBox = richTextBox;
    }

    public void Emit(LogEvent logEvent)
    {
        var message = logEvent.RenderMessage();
        var timestamp = logEvent.Timestamp.ToString("HH:mm:ss");
        var level = logEvent.Level.ToString().ToUpperInvariant()[..4]; // INFO, WARN, ERRO, FATL
        var text = $"{timestamp} [{level}] {message}";
        var color = GetColor(logEvent.Level);

        Application.Current?.Dispatcher.InvokeAsync(() =>
        {
            var para = new Paragraph(new Run(text) { Foreground = new SolidColorBrush(color) })
            {
                Margin = new Thickness(0)
            };
            _richTextBox.Document.Blocks.Add(para);
            _richTextBox.ScrollToEnd();
        });
    }

    private static Color GetColor(LogEventLevel level) => level switch
    {
        LogEventLevel.Warning => Colors.Orange,
        LogEventLevel.Error or LogEventLevel.Fatal => Colors.Red,
        _ => Colors.LimeGreen
    };
}