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package junit.textui;

import java.io.PrintStream;
import java.text.NumberFormat;
import java.util.Enumeration;

import junit.framework.AssertionFailedError;
import junit.framework.Test;
import junit.framework.TestFailure;
import junit.framework.TestListener;
import junit.framework.TestResult;
import junit.runner.BaseTestRunner;

public class ResultPrinter implements TestListener
{
	PrintStream fWriter;
	int fColumn= 0;

	public ResultPrinter(PrintStream writer)
	{
		fWriter= writer;
	}

	/* API for use by textui.TestRunner */

	synchronized void print(TestResult result, long runTime)
	{
		printHeader(runTime);
		printErrors(result);
		printFailures(result);
		printFooter(result);
	}

	void printWaitPrompt()
	{
		getWriter().println();
		getWriter().println(" to continue");
	}

	/* Internal methods */

	protected void printHeader(long runTime)
	{
		getWriter().println();
		getWriter().println("Time: " + elapsedTimeAsString(runTime));
	}

	protected void printErrors(TestResult result)
	{
		printDefects(result.errors(), result.errorCount(), "error");
	}

	protected void printFailures(TestResult result)
	{
		printDefects(result.failures(), result.failureCount(), "failure");
	}

	protected void printDefects(Enumeration booBoos, int count, String type)
	{
		if (count == 0)
			return;
		if (count == 1)
		{
			getWriter().println("There was " + count + " " + type + ":");
		}
		else
		{
			getWriter().println("There were " + count + " " + type + "s:");
		}
		for (int i= 1; booBoos.hasMoreElements(); i++)
		{
			printDefect(booBoos.nextElement(), i);
		}
	}

	public void printDefect(TestFailure booBoo, int count)
	{ // only public for testing purposes
		printDefectHeader(booBoo, count);
		printDefectTrace(booBoo);
	}

	protected void printDefectHeader(TestFailure booBoo, int count)
	{
		// I feel like making this a println, then adding a line giving the throwable a chance to print something
		// before we get to the stack trace.
		getWriter().print(count + ") " + booBoo.failedTest());
	}

	protected void printDefectTrace(TestFailure booBoo)
	{
		getWriter().print(BaseTestRunner.getFilteredTrace(booBoo.trace()));
	}

	protected void printFooter(TestResult result)
	{
		if (result.wasSuccessful())
		{
			getWriter().println();
			getWriter().print("OK");
			getWriter().println(" (" + result.runCount() + " test" + (result.runCount() == 1 ? "" : "s") + ")");

		}
		else
		{
			getWriter().println();
			getWriter().println("FAILURES!!!");
			getWriter().println("Tests run: " + result.runCount() + ",  Failures: " + result.failureCount() + ",  Errors: " + result.errorCount());
		}
		getWriter().println();
	}

	/**
	 * Returns the formatted string of the elapsed time.
	 * Duplicated from BaseTestRunner. Fix it.
	 */
	protected String elapsedTimeAsString(long runTime)
	{
		return NumberFormat.getInstance().format((double) runTime / 1000);
	}

	public PrintStream getWriter()
	{
		return fWriter;
	}

	/**
	 * @see junit.framework.TestListener#addError(Test, Throwable)
	 */
	public void addError(Test test, Throwable t)
	{
		getWriter().print("E");
	}

	/**
	 * @see junit.framework.TestListener#addFailure(Test, AssertionFailedError)
	 */
	public void addFailure(Test test, AssertionFailedError t)
	{
		getWriter().print("F");
	}

	/**
	 * @see junit.framework.TestListener#endTest(Test)
	 */
	public void endTest(Test test)
	{
	}

	/**
	 * @see junit.framework.TestListener#startTest(Test)
	 */
	public void startTest(Test test)
	{
		getWriter().print(".");
		if (fColumn++ >= 40)
		{
			getWriter().println();
			fColumn= 0;
		}
	}

}