using Microsoft.Extensions.Logging;
using MQTTnet.Diagnostics;
using System;
using System.Threading;

namespace MQTTnet.Server.Logging
{
    public class MqttNetLoggerWrapper : IMqttNetLogger
    {
        readonly ILogger<MqttServer> _logger;

        public MqttNetLoggerWrapper(ILogger<MqttServer> logger)
        {
            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
        }

        public event EventHandler<MqttNetLogMessagePublishedEventArgs> LogMessagePublished;

        public IMqttNetLogger CreateChildLogger(string source)
        {
            return new MqttNetLogger(source);
        }

        public void Publish(MqttNetLogLevel level, string source, string message, object[] parameters, Exception exception)
        {
            var convertedLogLevel = ConvertLogLevel(level);
            _logger.Log(convertedLogLevel, exception, message, parameters);

            var logMessagePublishedEvent = LogMessagePublished;
            if (logMessagePublishedEvent != null)
            {
                var logMessage = new MqttNetLogMessage
                {
                    Timestamp = DateTime.UtcNow,
                    ThreadId = Thread.CurrentThread.ManagedThreadId,
                    Source = source,
                    Level = level,
                    Message = message,
                    Exception = exception
                };

                logMessagePublishedEvent.Invoke(this, new MqttNetLogMessagePublishedEventArgs(logMessage));
            }
        }

        public void Publish(MqttNetLogLevel logLevel, string message, object[] parameters, Exception exception)
        {
            Publish(logLevel, null, message, parameters, exception);
        }

        static LogLevel ConvertLogLevel(MqttNetLogLevel logLevel)
        {
            switch (logLevel)
            {
                case MqttNetLogLevel.Error: return LogLevel.Error;
                case MqttNetLogLevel.Warning: return LogLevel.Warning;
                case MqttNetLogLevel.Info: return LogLevel.Information;
                case MqttNetLogLevel.Verbose: return LogLevel.Debug;
            }

            return LogLevel.Debug;
        }
    }
}