//
// report.cs: report errors and warnings.
//
// Author: Miguel de Icaza (miguel@ximian.com)
//
// (C) 2001 Ximian, Inc. (http://www.ximian.com)
//

//
// FIXME: currently our class library does not support custom number format strings
//
using System;
using System.Text;
using System.Collections;
using System.Diagnostics;

namespace Mono.MonoBASIC {

	/// <summary>
	///   This class is used to report errors and warnings t te user.
	/// </summary>
	public class Report {
		/// <summary>  
		///   Errors encountered so far
		/// </summary>
		static public int Errors;

		/// <summary>  
		///   Warnings encountered so far
		/// </summary>
		static public int Warnings;

		/// <summary>  
		///   Whether errors should be throw an exception
		/// </summary>
		static public bool Fatal;
		
		/// <summary>  
		///   Whether warnings should be considered errors
		/// </summary>
		static public bool WarningsAreErrors;

		/// <summary>  
		///   Whether to dump a stack trace on errors. 
		/// </summary>
		static public bool Stacktrace;
		
		//
		// If the 'expected' error code is reported then the
                // compilation succeeds.
		//
		// Used for the test suite to excercise the error codes
		//
		static int expected_error = 0;

		//
		// Keeps track of the warnings that we are ignoring
		//
		static Hashtable warning_ignore_table;
		
		static public int ProcessResults(bool quiet)
		{
			if (!quiet)
			{
				if (Report.ExpectedError != 0)
					Console.WriteLine("Failed to report expected Error " + Report.ExpectedError);
					
				if (Errors == 0) 
				{
					if (Warnings == 0) 
						Console.WriteLine("Compilation succeeded");
					else
						Console.WriteLine("Compilation succeeded: {0} warning(s)", Warnings);
				}
				else
					Console.WriteLine("Compilation failed: {0} Error(s), {1} warnings",	Errors, Warnings);
			}
			return (Errors == 0)?0:1;
		}
		
		static void Check (int code)
		{
			if (code == expected_error)
			{
				if (Fatal)
					throw new Exception ();
				
				Environment.Exit (0);
			}
		}
		
		static private void RealError (string msg)
		{
			Errors++;
			Console.WriteLine (msg);

			if (Stacktrace)
				Console.WriteLine (new StackTrace ().ToString ());
			if (Fatal)
				throw new Exception (msg);
		}

		static public void Error (int code, Location l, string text)
		{
			string msg = String.Format (
				"{0}({1},{2}) error BC{3:0000}: {4}", l.Name, l.Row, l.Col, code, text);
			
			RealError (msg);
			Check (code);
		}

		static public void Warning (int code, Location l, string text)
		{
			if (warning_ignore_table != null){
				if (warning_ignore_table.Contains (code))
					return;
			}
			
			if (WarningsAreErrors)
				Error (code, l, text);
			else {
				if (Location.IsNull (l))
					Console.WriteLine(String.Format("{0} warning BC{1:0000}: {2}",
						l.Name, code, text));
				else
					Console.WriteLine(String.Format("{0}({1},{2}) warning BC{3:0000}: {4}",
						l.Name, l.Row, l.Col, code, text));
				Warnings++;
				Check (code);

				if (Stacktrace)
					Console.WriteLine (new StackTrace ().ToString ());
			}
		}
		
		static public void Warning (int code, string text)
		{
			Warning (code, Location.Null, text);
		}

		static public void Warning (int code, int level, string text)
		{
			if (RootContext.WarningLevel >= level)
				Warning (code, Location.Null, text);
		}

		static public void Warning (int code, int level, Location l, string text)
		{
			if (RootContext.WarningLevel >= level)
				Warning (code, l, text);
		}

		static public void Error (int code, string text)
		{
			string msg = String.Format ("error BC{0:0000}: {1}", code, text);
			
			RealError (msg);
			Check (code);
		}

		static public void Message (Message m)
		{
			if (m is ErrorMessage)
				Error (m.code, m.text);
			else
				Warning (m.code, m.text);
		}

		static public void SetIgnoreWarning (int code)
		{
			if (warning_ignore_table == null)
				warning_ignore_table = new Hashtable ();

			warning_ignore_table [code] = true;
		}
		
                static public int ExpectedError {
                        set {
                                expected_error = value;
                        }
                        get {
                                return expected_error;
                        }
                }

		public static int DebugFlags = 0;

		[Conditional ("MCS_DEBUG")]
		static public void Debug (string message, params object[] args)
		{
			Debug (4, message, args);
		}
			
		[Conditional ("MCS_DEBUG")]
		static public void Debug (int category, string message, params object[] args)
		{
			if ((category & DebugFlags) == 0)
				return;

			StringBuilder sb = new StringBuilder (message);

			if ((args != null) && (args.Length > 0)) {
				sb.Append (": ");

				bool first = true;
				foreach (object arg in args) {
					if (first)
						first = false;
					else
						sb.Append (",");
					if (arg == null)
						sb.Append ("null");
					else if (arg is ICollection)
						sb.Append (PrintCollection ((ICollection) arg));
					else
						sb.Append (arg);
				}
			}

			Console.WriteLine (sb.ToString ());
		}

		static public string PrintCollection (ICollection collection)
		{
			StringBuilder sb = new StringBuilder ();

			sb.Append (collection.GetType ());
			sb.Append ("(");

			bool first = true;
			foreach (object o in collection) {
				if (first)
					first = false;
				else
					sb.Append (",");
				sb.Append (o);
			}

			sb.Append (")");
			return sb.ToString ();
		}
	}

	public class Message {
		public int code;
		public string text;
		
		public Message (int code, string text)
		{
			this.code = code;
			this.text = text;
		}
	}

	public class WarningMessage : Message {
		public WarningMessage (int code, string text) : base (code, text)
		{
		}
	}

	public class ErrorMessage : Message {
		public ErrorMessage (int code, string text) : base (code, text)
		{
		}

		//
		// For compatibility reasons with old code.
		//
		public static void report_error (string error)
		{
			Console.Write ("ERROR: ");
			Console.WriteLine (error);
		}
	}

	public enum TimerType {
		FindMembers	= 0,
		TcFindMembers	= 1,
		MemberLookup	= 2,
		CachedLookup	= 3,
		CacheInit	= 4,
		MiscTimer	= 5,
		CountTimers	= 6
	}

	public enum CounterType {
		FindMembers	= 0,
		MemberCache	= 1,
		MiscCounter	= 2,
		CountCounters	= 3
	}

	public class Timer
	{
		static DateTime[] timer_start;
		static TimeSpan[] timers;
		static long[] timer_counters;
		static long[] counters;

		static Timer ()
		{
			timer_start = new DateTime [(int) TimerType.CountTimers];
			timers = new TimeSpan [(int) TimerType.CountTimers];
			timer_counters = new long [(int) TimerType.CountTimers];
			counters = new long [(int) CounterType.CountCounters];

			for (int i = 0; i < (int) TimerType.CountTimers; i++) {
				timer_start [i] = DateTime.Now;
				timers [i] = TimeSpan.Zero;
			}
		}

		[Conditional("TIMER")]
		static public void IncrementCounter (CounterType which)
		{
			++counters [(int) which];
		}

		[Conditional("TIMER")]
		static public void StartTimer (TimerType which)
		{
			timer_start [(int) which] = DateTime.Now;
		}

		[Conditional("TIMER")]
		static public void StopTimer (TimerType which)
		{
			timers [(int) which] += DateTime.Now - timer_start [(int) which];
			++timer_counters [(int) which];
		}

		[Conditional("TIMER")]
		static public void ShowTimers ()
		{
			ShowTimer (TimerType.FindMembers, "- FindMembers timer");
			ShowTimer (TimerType.TcFindMembers, "- TypeContainer.FindMembers timer");
			ShowTimer (TimerType.MemberLookup, "- MemberLookup timer");
			ShowTimer (TimerType.CachedLookup, "- CachedLookup timer");
			ShowTimer (TimerType.CacheInit, "- Cache init");
			ShowTimer (TimerType.MiscTimer, "- Misc timer");

			ShowCounter (CounterType.FindMembers, "- Find members");
			ShowCounter (CounterType.MemberCache, "- Member cache");
			ShowCounter (CounterType.MiscCounter, "- Misc counter");
		}

		static public void ShowCounter (CounterType which, string msg)
		{
			Console.WriteLine ("{0} {1}", counters [(int) which], msg);
		}

		static public void ShowTimer (TimerType which, string msg)
		{
			Console.WriteLine (
				"[{0:00}:{1:000}] {2} (used {3} times)",
				(int) timers [(int) which].TotalSeconds,
				timers [(int) which].Milliseconds, msg,
				timer_counters [(int) which]);
		}
	}

	public class InternalErrorException : Exception {
		public InternalErrorException ()
			: base ("Internal error")
		{
		}

		public InternalErrorException (string message)
			: base (message)
		{
		}
	}
}