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("<RETURN> 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((TestFailure) 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;
		}
	}

}