namespace NUnit.TextUI 
{
	using System;
	using System.IO;
	using System.Reflection;
	using NUnit.Framework;
	using NUnit.Runner;

	/// <summary>A command line based tool to run tests.</summary><remarks>
	/// <code>
	/// C:\NUnitConsole.exe /t [/wait] TestCaseClass
	/// </code>
	/// TestRunner expects the name of a TestCase class as argument.
	/// If this class defines a static <c>Suite</c> property it 
	/// will be invoked and the returned test is run. Otherwise all 
	/// the methods starting with "Test" having no arguments are run.
	///
	/// When the wait command line argument is given TestRunner
	/// waits until the users types RETURN.
	///
	/// TestRunner prints a trace as the tests are executed followed by a
	/// summary at the end.</remarks>
	public class TestRunner : BaseTestRunner 
	{
		int fColumn = 0;
		TextWriter fWriter = Console.Out;

		/// <summary>
		/// Constructs a TestRunner.
		/// </summary>
		public TestRunner() {}

		/// <summary>
		/// Constructs a TestRunner using the given stream for all the output
		/// </summary>
		public TestRunner(TextWriter writer) : this() 
		{
			if (writer != null)
			{
				fWriter= writer;
			}
			else
			{
				throw new ArgumentNullException("writer");
			}
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="test"></param>
		/// <param name="t"></param>
		public override void AddError(ITest test, Exception t) 
		{
			lock(this)
				this.Writer.Write("E");
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="test"></param>
		/// <param name="t"></param>
		public override void AddFailure(ITest test, AssertionFailedError t) 
		{
			lock (this)
				this.Writer.Write("F");
		}

		/// <summary>Creates the TestResult to be used for the test run.</summary>
		protected TestResult CreateTestResult() 
		{
			return new TestResult();
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="suite"></param>
		/// <param name="wait"></param>
		/// <returns></returns>
		protected TestResult DoRun(ITest suite, bool wait) 
		{
			TestResult result= CreateTestResult();
			result.AddListener(this);
			long startTime= System.DateTime.Now.Ticks;
			suite.Run(result);
			long endTime= System.DateTime.Now.Ticks;
			long runTime= (endTime-startTime) / 10000;
			Writer.WriteLine();
			Writer.WriteLine("Time: "+ElapsedTimeAsString(runTime));
			Print(result);

			Writer.WriteLine();
            
			if (wait) 
			{
				Writer.WriteLine("<RETURN> to continue");
				try 
				{
					Console.ReadLine();
				}
				catch(Exception) 
				{
				}
			}
			return result;    
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="test"></param>
    
		public override void EndTest(ITest test) 
		{
		}
		/// <summary>
		/// 
		/// </summary>
		/// <returns></returns>
		public override ITestLoader GetLoader() 
		{
			return new StandardLoader();
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="result"></param>
		public void Print(TestResult result) 
		{
			lock(this) 
			{
				PrintErrors(result);
				PrintFailures(result);
				PrintHeader(result);
			}
		}

		/// <summary>Prints the errors to the standard output.</summary>
		public void PrintErrors(TestResult result) 
		{
			if (result.ErrorCount != 0) 
			{
				if (result.ErrorCount == 1)
					Writer.WriteLine("There was "+result.ErrorCount+" error:");
				else
					Writer.WriteLine("There were "+result.ErrorCount+" errors:");
                
				int i= 1;
				foreach (TestFailure failure in result.Errors) 
				{
					Writer.WriteLine(i++ + ") "+failure+"("+failure.ThrownException.GetType().ToString()+")");
					Writer.Write(GetFilteredTrace(failure.ThrownException));
				}
			}
		}

		/// <summary>Prints failures to the standard output.</summary>
		public void PrintFailures(TestResult result) 
		{
			if (result.FailureCount != 0) 
			{
				if (result.FailureCount == 1)
					Writer.WriteLine("There was " + result.FailureCount + " failure:");
				else
					Writer.WriteLine("There were " + result.FailureCount + " failures:");
				int i = 1;
				foreach (TestFailure failure in result.Failures) 
				{
					Writer.Write(i++ + ") " + failure.FailedTest);
					Exception t= failure.ThrownException;
					if (t.Message != "")
						Writer.WriteLine(" \"" + Truncate(t.Message) + "\"");
					else 
					{
						Writer.WriteLine();
						Writer.Write(GetFilteredTrace(failure.ThrownException));
					}
				}
			}
		}

		/// <summary>Prints the header of the report.</summary>
		public void PrintHeader(TestResult result) 
		{
			if (result.WasSuccessful) 
			{
				Writer.WriteLine();
				Writer.Write("OK");
				Writer.WriteLine (" (" + result.RunCount + " tests)");
                
			} 
			else 
			{
				Writer.WriteLine();
				Writer.WriteLine("FAILURES!!!");
				Writer.WriteLine("Tests Run: "+result.RunCount+ 
					", Failures: "+result.FailureCount+
					", Errors: "+result.ErrorCount);
			}
		}

		/// <summary>Runs a Suite extracted from a TestCase subclass.</summary>
		static public void Run(Type testClass) 
		{
			Run(new TestSuite(testClass));
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="suite"></param>
		static public void Run(ITest suite) 
		{
			TestRunner aTestRunner= new TestRunner();
			aTestRunner.DoRun(suite, false);
		}

		/// <summary>Runs a single test and waits until the user
		/// types RETURN.</summary>
		static public void RunAndWait(ITest suite) 
		{
			TestRunner aTestRunner= new TestRunner();
			aTestRunner.DoRun(suite, true);
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="message"></param>
		protected override void RunFailed(string message) 
		{
			Console.Error.WriteLine(message);
			Environment.ExitCode = 1;
			throw new ApplicationException(message);
		}

		/// <summary>Starts a test run. Analyzes the command line arguments
		/// and runs the given test suite.</summary>
		public TestResult Start(string[] args) 
		{
			bool wait = false;
			string testCase = ProcessArguments(args, ref wait);
			if (testCase.Equals(""))
				throw new ApplicationException("Usage: NUnitConsole.exe [/wait] testCaseName, where\n"
					+ "name is the name of the TestCase class");

			try 
			{
				ITest suite = GetTest(testCase);
				return DoRun(suite, wait);
			} 
			catch (Exception e) 
			{
				throw new ApplicationException("Could not create and run test suite.", e);
			}
		}
		/// <summary>
		/// 
		/// </summary>
		/// <param name="test"></param>
		public override void StartTest(ITest test) 
		{
			lock (this) 
			{
				Writer.Write(".");
				if (fColumn++ >= 40) 
				{
					Writer.WriteLine();
					fColumn = 0;
				}
			}
		}
		/// <summary>
		/// 
		/// </summary>
		protected TextWriter Writer 
		{
			get { return fWriter; }
		}
	}
}