using OF_DL.Enumerations;
using Serilog;
using Serilog.Core;
using Serilog.Events;

namespace OF_DL.Services;

public class LoggingService : ILoggingService
{
    private readonly ILogEventSink? _optionalErrorSink;

    public LoggingService(ILogEventSink? optionalErrorSink = null)
    {
        _optionalErrorSink = optionalErrorSink;
        LevelSwitch = new LoggingLevelSwitch();
        InitializeLogger();
    }

    /// <summary>
    /// Gets the level switch that controls runtime logging verbosity.
    /// </summary>
    public LoggingLevelSwitch LevelSwitch { get; }

    /// <summary>
    /// Updates the minimum logging level at runtime.
    /// </summary>
    /// <param name="newLevel">The new minimum log level.</param>
    public void UpdateLoggingLevel(LoggingLevel newLevel)
    {
        LevelSwitch.MinimumLevel = (LogEventLevel)newLevel;
        Log.Debug("Logging level updated to: {LoggingLevel}", newLevel);
    }

    /// <summary>
    /// Returns the current minimum logging level.
    /// </summary>
    public LoggingLevel GetCurrentLoggingLevel() => (LoggingLevel)LevelSwitch.MinimumLevel;

    private void InitializeLogger()
    {
        // Set the initial level to Error (until we've read from config)
        LevelSwitch.MinimumLevel = LogEventLevel.Error;

        LoggerConfiguration loggerConfiguration = new LoggerConfiguration()
            .MinimumLevel.ControlledBy(LevelSwitch)
            .WriteTo.File("logs/OFDL.txt", rollingInterval: RollingInterval.Day);

        if (_optionalErrorSink != null)
        {
            loggerConfiguration = loggerConfiguration.WriteTo.Sink(_optionalErrorSink,
                LogEventLevel.Error);
        }

        Log.Logger = loggerConfiguration.CreateLogger();

        Log.Debug("Logging service initialized");
    }
}