using System;
using System.IO;

namespace sharp.logging
{
    public class FileLogger : LoggingBackend, IDisposable
    {
        FileStream fileStream;
        TextWriter writer;

        public FileLogger(string filename)
        {
            openLogFile(filename);
        }

        private void openLogFile(string filename)
        {
            fileStream = new FileStream(filename, FileMode.Append);
            writer = new StreamWriter(fileStream);
        }

        public void Close()
        {
            if (writer != null)
            {
                writer.Close();
                fileStream.Close();
            }
        }

        public void Dispose()
        {
            if (writer != null)
            {
                writer.Close();
                writer.Dispose();
                writer = null;
            }
            if (fileStream != null)
            {
                fileStream.Close();
                fileStream.Dispose();
                fileStream = null;
            }
        }

        protected override void MessageReceived(LogLevel logLevel, string[] lines)
        {
            if (writer == null)
            {
                throw new ObjectDisposedException("FileLogger has already been disposed");
            }
            foreach (String line in lines)
            {
                writer.WriteLine(line);
                writer.Flush();
            }
        }


    }
}