using System;

namespace ServiceStack.Logging
{
    /// <summary>
	/// Default logger is to System.Diagnostics.Debug.WriteLine
    /// 
    /// Made public so its testable
    /// </summary>
    public class DebugLogger : ILog
    {
        const string DEBUG = "DEBUG: ";
        const string ERROR = "ERROR: ";
        const string FATAL = "FATAL: ";
        const string INFO = "INFO: ";
        const string WARN = "WARN: ";

        /// <summary>
        /// Initializes a new instance of the <see cref="DebugLogger"/> class.
        /// </summary>
        public DebugLogger(string type)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="DebugLogger"/> class.
        /// </summary>
        public DebugLogger(Type type)
        {
        }

        /// <summary>
        /// Logs the specified message.
        /// </summary>
        private static void Log(object message, Exception exception)
        {
            string msg = message?.ToString() ?? string.Empty;
            if (exception != null)
            {
                msg += ", Exception: " + exception.Message;
            }
            System.Diagnostics.Debug.WriteLine(msg);
        }

        /// <summary>
        /// Logs the format.
        /// </summary>
        private static void LogFormat(object message, params object[] args)
        {
            string msg = message?.ToString() ?? string.Empty;
            System.Diagnostics.Debug.WriteLine(string.Format(msg, args));
        }

        /// <summary>
        /// Logs the specified message.
        /// </summary>
        private static void Log(object message)
        {
            string msg = message?.ToString() ?? string.Empty;
            System.Diagnostics.Debug.WriteLine(msg);
        }

        public void Debug(object message, Exception exception)
        {
            Log(DEBUG + message, exception);
        }

        public bool IsDebugEnabled { get; set; }

        public void Debug(object message)
        {
            Log(DEBUG + message);
        }

        public void DebugFormat(string format, params object[] args)
        {
            LogFormat(DEBUG + format, args);
        }

        public void Error(object message, Exception exception)
        {
            Log(ERROR + message, exception);
        }

        public void Error(object message)
        {
            Log(ERROR + message);
        }

        public void ErrorFormat(string format, params object[] args)
        {
            LogFormat(ERROR + format, args);
        }

        public void Fatal(object message, Exception exception)
        {
            Log(FATAL + message, exception);
        }

        public void Fatal(object message)
        {
            Log(FATAL + message);
        }

        public void FatalFormat(string format, params object[] args)
        {
            LogFormat(FATAL + format, args);
        }

        public void Info(object message, Exception exception)
        {
            Log(INFO + message, exception);
        }

        public void Info(object message)
        {
            Log(INFO + message);
        }

        public void InfoFormat(string format, params object[] args)
        {
            LogFormat(INFO + format, args);
        }

        public void Warn(object message, Exception exception)
        {
            Log(WARN + message, exception);
        }

        public void Warn(object message)
        {
            Log(WARN + message);
        }

        public void WarnFormat(string format, params object[] args)
        {
            LogFormat(WARN + format, args);
        }
    }
}