using System;
using System.Collections.Generic;
using System.Linq;
using System.Diagnostics;
using System.Text;

namespace PatcherServer.Helper
{
	public class LogHelper : TraceListener {
		public static void Initialize() {
			Instance = new LogHelper();
		}

		public LogHelper() {
			Messages = new List<string>();
		}

		public EventHandler<LogEventArgs> LogEvent;

		public override void Write(string message) {
			WriteLine(message);
		}

		public override void WriteLine(string message) {
			if (LogEvent != null) {
				LogEvent(this, new LogEventArgs(message));
			}
			Messages.Add(message);

			CheckForOverflow();
		}

		private void CheckForOverflow() {
			if (Messages.Count > MAXLOGCOUNT) {
				Messages.RemoveRange(0, Messages.Count - MAXLOGCOUNT);
			}
		}

		public static LogHelper Instance { get; private set; }
		public List<string> Messages { get; private set; }

		private const int MAXLOGCOUNT = 20;
	}

	public class LogEventArgs : EventArgs {
		public LogEventArgs(string message) {
			this.Message = message;
		}
		public string Message { get; private set; }
	}
}