using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Factory.FactoryMethod
{
	abstract class LogFactory
	{
		// factory method 패턴
		protected abstract ILog GetLog();

		public void Log(string message)
		{
			ILog logger = GetLog(); // 어떤 로그타입을 사용할 지 결정되지 않음
			logger.write($"{DateTime.Now}: {message}");
		}

		public static LogFactory GetLogger()
		{
			string logType = ConfigurationManager.AppSettings["LogType"];
			switch (logType)
			{
				case "DB":
					return new DbLogFactory();
				case "XML":
					return new XmlLogFactory();
				default:
					throw new ApplicationException();
			}
		}
	}
}