using System.Collections.ObjectModel;
using System.Windows.Threading;

namespace SSPCTester.UI.Services;

/// <summary>
/// UI 日志接收器：把日志事件投递到 UI 线程的 ObservableCollection，供日志面板绑定。
/// </summary>
public sealed class UiLogSink
{
    private readonly Dispatcher _dispatcher = Dispatcher.CurrentDispatcher;
    public ObservableCollection<LogEntry> Entries { get; } = new();

    public int MaxEntries { get; set; } = 500;

    public void Add(UiLogLevel level, string message)
    {
        var entry = new LogEntry(DateTime.Now, level, message);
        if (_dispatcher.CheckAccess()) Append(entry);
        else _dispatcher.BeginInvoke(() => Append(entry));
    }

    private void Append(LogEntry entry)
    {
        Entries.Add(entry);
        while (Entries.Count > MaxEntries) Entries.RemoveAt(0);
    }
}

public enum UiLogLevel { Info, Success, Warning, Error }

public sealed record LogEntry(DateTime Time, UiLogLevel Level, string Message)
{
    public string TimeText => Time.ToString("HH:mm:ss.fff");
}