using log4net;
using System;

namespace GitConverter.Lib.Logging
{
    /// <summary>
    /// Adapter that forwards library logging calls to a log4net <see cref="ILog"/> instance.
    /// </summary>
    /// <remarks>
    /// - The adapter keeps the library free of direct log4net references except for the adapter itself.
    /// - Constructor validates the provided <see cref="ILog"/> to fail fast if misconfigured.
    /// </remarks>
    public sealed class Log4NetAdapter : IAppLogger
    {
        private readonly ILog _log;

        /// <summary>
        /// Creates a new adapter that forwards calls to the specified <paramref name="log"/>.
        /// </summary>
        /// <param name="log">A non-null log4net logger instance.</param>
        /// <exception cref="ArgumentNullException">Thrown when <paramref name="log"/> is null.</exception>
        public Log4NetAdapter(ILog log)
        {
            _log = log ?? throw new ArgumentNullException(nameof(log));
        }

        public void Debug(string message)
        {
            try { _log.Debug(message); }
            catch { /* swallow to avoid logging causing application failures */ }
        }

        public void Info(string message)
        {
            try { _log.Info(message); }
            catch { /* swallow to avoid logging causing application failures */ }
        }

        public void Warn(string message)
        {
            try { _log.Warn(message); }
            catch { /* swallow to avoid logging causing application failures */ }
        }

        public void Error(string message, Exception ex = null)
        {
            try
            {
                if (ex != null) _log.Error(message, ex);
                else _log.Error(message);
            }
            catch { /* swallow to avoid logging causing application failures */ }
        }
    }
}