namespace ChadSoft.Logging
{
    using System;

    /// <summary>
    /// Static class used for logging.
    /// </summary>
    public static class Logger
    {
        // The format string used to format text-based logging messages
        // {0}: Level;  {1}: Message
        private const string FORMAT_STRING = "{0}: {1}";

        /// <summary>
        /// Logs the specified Debug message.
        /// </summary>
        /// <param name="message">The message.</param>
        public static void Debug(string message) { Log(LogLevel.Debug, message); }
        /// <summary>
        /// Logs the specified Debug message.
        /// </summary>
        /// <param name="format">The message format.</param>
        /// <param name="args">The message arguments.</param>
        public static void Debug(string format, params object[] args) { Log(LogLevel.Debug, format, args); }

        /// <summary>
        /// Logs the specified Informational message.
        /// </summary>
        /// <param name="message">The message.</param>
        public static void Info(string message) { Log(LogLevel.Info, message); }
        /// <summary>
        /// Logs the specified Informational message.
        /// </summary>
        /// <param name="format">The message format.</param>
        /// <param name="args">The message arguments.</param>
        public static void Info(string format, params object[] args) { Log(LogLevel.Info, format, args); }

        /// <summary>
        /// Logs the specified Error message.
        /// </summary>
        /// <param name="format">The message format.</param>
        /// <param name="args">The message arguments.</param>
        public static void Error(string format, params object[] args) { Log(LogLevel.Error, format, args); }
        /// <summary>
        /// Logs the specified exception.
        /// </summary>
        /// <param name="ex">The ex.</param>
        public static void Error(Exception ex) { Log(LogLevel.Error, ex.Message); }


        /// <summary>
        /// Logs a message at the specified level.
        /// </summary>
        /// <param name="level">The error level.</param>
        /// <param name="message">The message.</param>
        public static void Log(LogLevel level, string message)
        {
            var logMessage = String.Format(FORMAT_STRING, level, message);

            // NOTE: Plug in and/or replace logging mechanism here

            switch (level)
            {
                case LogLevel.Debug:
                    System.Diagnostics.Debug.WriteLine(logMessage);
                    break;
                case LogLevel.Info:
                case LogLevel.Warn:
                    Console.WriteLine(logMessage);
                    break;
                case LogLevel.Error:
                case LogLevel.Fatal:
                    Console.Error.WriteLine(logMessage);
                    break;
            }
        }
        /// <summary>
        /// Logs a message at the specified level using the supplied format string and arguments.
        /// </summary>
        /// <param name="level">The error level.</param>
        /// <param name="format">The format string.</param>
        /// <param name="args">The arguments.</param>
        public static void Log(LogLevel level, string format, params object[] args)
        {
            Log(level, String.Format(format, args));
        }
    }

}