/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

package org.apache.cassandra;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.taskdefs.optional.junit.IgnoredTestListener;
import org.apache.tools.ant.taskdefs.optional.junit.JUnitResultFormatter;
import org.apache.tools.ant.taskdefs.optional.junit.JUnitTest;
import org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner;
import org.apache.tools.ant.taskdefs.optional.junit.JUnitVersionHelper;
import org.apache.tools.ant.taskdefs.optional.junit.XMLConstants;
import org.apache.tools.ant.util.DOMElementWriter;
import org.apache.tools.ant.util.DateUtils;
import org.apache.tools.ant.util.FileUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;

import junit.framework.AssertionFailedError; // checkstyle: permit this import
import junit.framework.Test; // checkstyle: permit this import

import static org.apache.cassandra.config.CassandraRelevantProperties.SUN_JAVA_COMMAND;
import static org.apache.cassandra.config.CassandraRelevantProperties.TEST_CASSANDRA_SUITENAME;
import static org.apache.cassandra.config.CassandraRelevantProperties.TEST_CASSANDRA_TESTTAG;
import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;

/**
 * Prints XML output of the test to a specified Writer.
 *
 * @see FormatterElement
 */

public class CassandraXMLJUnitResultFormatter implements JUnitResultFormatter, XMLConstants, IgnoredTestListener {

    private static final double ONE_SECOND = 1000.0;

    /** constant for unnnamed testsuites/cases */
    private static final String UNKNOWN = "unknown";

    private static DocumentBuilder getDocumentBuilder() {
        try {
            return DocumentBuilderFactory.newInstance().newDocumentBuilder();
        } catch (final Exception exc) {
            throw new ExceptionInInitializerError(exc);
        }
    }

    private static final String tag = TEST_CASSANDRA_TESTTAG.getString();

    /*
     * Set the property for the test suite name so that log configuration can pick it up
     * and log to a file specific to this test suite
     */
    static
    {
        String command = SUN_JAVA_COMMAND.getString();
        String args[] = command.split(" ");
        TEST_CASSANDRA_SUITENAME.setString(args[1]);
    }

    /**
     * The XML document.
     */
    private Document doc;

    /**
     * The wrapper for the whole testsuite.
     */
    private Element rootElement;

    /**
     * Element for the current test.
     *
     * The keying of this map is a bit of a hack: tests are keyed by caseName(className) since
     * the Test we get for Test-start isn't the same as the Test we get during test-assumption-fail,
     * so we can't easily match Test objects without manually iterating over all keys and checking
     * individual fields.
     */
    private final Hashtable<String, Element> testElements = new Hashtable<String, Element>();

    private Element propsElement;
    private Element systemOutputElement;

    /**
     * tests that failed.
     */
    private final Hashtable failedTests = new Hashtable();

    /**
     * Tests that were skipped.
     */
    private final Hashtable<String, Test> skippedTests = new Hashtable<String, Test>();
    /**
     * Tests that were ignored. See the note above about the key being a bit of a hack.
     */
    private final Hashtable<String, Test> ignoredTests = new Hashtable<String, Test>();
    /**
     * Timing helper.
     */
    private final Hashtable<String, Long> testStarts = new Hashtable<String, Long>();
    /**
     * Where to write the log to.
     */
    private OutputStream out;

    /** No arg constructor. */
    public CassandraXMLJUnitResultFormatter() {
    }

    /** {@inheritDoc}. */
    public void setOutput(final OutputStream out) {
        this.out = out;
    }

    /** {@inheritDoc}. */
    public void setSystemOutput(final String out) {
        systemOutputElement = formatOutput(SYSTEM_OUT, out);
    }

    /** {@inheritDoc}. */
    public void setSystemError(final String out) {
        rootElement.appendChild(formatOutput(SYSTEM_ERR, out));
    }

    /**
     * The whole testsuite started.
     * @param suite the testsuite.
     */
    public void startTestSuite(final JUnitTest suite) {
        doc = getDocumentBuilder().newDocument();
        rootElement = doc.createElement(TESTSUITE);
        String n = suite.getName();
        if (n != null && !tag.isEmpty())
            n = n + "-" + tag;
        rootElement.setAttribute(ATTR_NAME, n == null ? UNKNOWN : n);

        //add the timestamp
        final String timestamp = DateUtils.format(new Date(),
                DateUtils.ISO8601_DATETIME_PATTERN);
        rootElement.setAttribute(TIMESTAMP, timestamp);
        //and the hostname.
        rootElement.setAttribute(HOSTNAME, getHostname());

        // Output properties
        propsElement = doc.createElement(PROPERTIES);
        final Properties props = suite.getProperties();
        if (props != null) {
            final Enumeration e = props.propertyNames();
            while (e.hasMoreElements()) {
                final String name = (String) e.nextElement();
                final Element propElement = doc.createElement(PROPERTY);
                propElement.setAttribute(ATTR_NAME, name);
                propElement.setAttribute(ATTR_VALUE, props.getProperty(name));
                propsElement.appendChild(propElement);
            }
        }
    }

    /**
     * get the local hostname
     * @return the name of the local host, or "localhost" if we cannot work it out
     */
    private String getHostname()  {
        String hostname = "localhost";
        try {
            final InetAddress localHost = InetAddress.getLocalHost();
            if (localHost != null) {
                hostname = localHost.getHostName();
            }
        } catch (final UnknownHostException e) {
            // fall back to default 'localhost'
        }
        return hostname;
    }

    /**
     * The whole testsuite ended.
     * @param suite the testsuite.
     * @throws BuildException on error.
     */
    public void endTestSuite(final JUnitTest suite) throws BuildException {
        rootElement.setAttribute(ATTR_TESTS, "" + suite.runCount());
        rootElement.setAttribute(ATTR_FAILURES, "" + suite.failureCount());
        rootElement.setAttribute(ATTR_ERRORS, "" + suite.errorCount());
        rootElement.setAttribute(ATTR_SKIPPED, "" + suite.skipCount());
        rootElement.setAttribute(ATTR_TIME, "" + (suite.getRunTime() / ONE_SECOND));
        if (suite.failureCount() > 0 || suite.errorCount() > 0)
        {
            // only include properties and system-out if there's failure/error
            rootElement.appendChild(propsElement);
            if (null != systemOutputElement)
                rootElement.appendChild(systemOutputElement);
        }
        if (out != null) {
            Writer wri = null;
            try {
                wri = new BufferedWriter(new OutputStreamWriter(out, "UTF8"));
                wri.write("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n");
                (new DOMElementWriter()).write(rootElement, wri, 0, "  ");
            } catch (final IOException exc) {
                throw new BuildException("Unable to write log file", exc);
            } finally {
                if (wri != null) {
                    try {
                        wri.flush();
                    } catch (final IOException ex) {
                        // ignore
                    }
                }
                if (out != System.out && out != System.err) {
                    FileUtils.close(wri);
                }
            }
        }
    }

    /**
     * Interface TestListener.
     *
     * <p>A new Test is started.
     * @param t the test.
     */
    public void startTest(final Test t) {
        testStarts.put(createDescription(t), currentTimeMillis());
    }

    private static String createDescription(final Test test) throws BuildException {
        if (!tag.isEmpty())
            return JUnitVersionHelper.getTestCaseName(test) + "-" + tag +"(" + JUnitVersionHelper.getTestCaseClassName(test) + ")";
        return JUnitVersionHelper.getTestCaseName(test) + "(" + JUnitVersionHelper.getTestCaseClassName(test) + ")";
    }

    /**
     * Interface TestListener.
     *
     * <p>A Test is finished.
     * @param test the test.
     */
    public void endTest(final Test test) {
        final String testDescription = createDescription(test);

        // Fix for bug #5637 - if a junit.extensions.TestSetup is
        // used and throws an exception during setUp then startTest
        // would never have been called
        if (!testStarts.containsKey(testDescription)) {
            startTest(test);
        }
        Element currentTest;
        if (!failedTests.containsKey(test) && !skippedTests.containsKey(testDescription) && !ignoredTests.containsKey(testDescription)) {
            currentTest = doc.createElement(TESTCASE);
            String n = JUnitVersionHelper.getTestCaseName(test);
            if (n != null && !tag.isEmpty())
                n = n + "-" + tag;
            currentTest.setAttribute(ATTR_NAME,
                                     n == null ? UNKNOWN : n);
            // a TestSuite can contain Tests from multiple classes,
            // even tests with the same name - disambiguate them.
            currentTest.setAttribute(ATTR_CLASSNAME,
                    JUnitVersionHelper.getTestCaseClassName(test));
            rootElement.appendChild(currentTest);
            testElements.put(createDescription(test), currentTest);
        } else {
            currentTest = testElements.get(testDescription);
        }

        final Long l = testStarts.get(createDescription(test));
        currentTest.setAttribute(ATTR_TIME,
            "" + ((currentTimeMillis() - l) / ONE_SECOND));
    }

    /**
     * Interface TestListener for JUnit &lt;= 3.4.
     *
     * <p>A Test failed.
     * @param test the test.
     * @param t the exception.
     */
    public void addFailure(final Test test, final Throwable t) {
        formatError(FAILURE, test, t);
    }

    /**
     * Interface TestListener for JUnit &gt; 3.4.
     *
     * <p>A Test failed.
     * @param test the test.
     * @param t the assertion.
     */
    public void addFailure(final Test test, final AssertionFailedError t) {
        addFailure(test, (Throwable) t);
    }

    /**
     * Interface TestListener.
     *
     * <p>An error occurred while running the test.
     * @param test the test.
     * @param t the error.
     */
    public void addError(final Test test, final Throwable t) {
        formatError(ERROR, test, t);
    }

    private void formatError(final String type, final Test test, final Throwable t) {
        if (test != null) {
            endTest(test);
            failedTests.put(test, test);
        }

        Element currentTest;
        if (test != null) {
            currentTest = testElements.get(createDescription(test));
        } else {
            currentTest = rootElement;
        }

        // A test can trigger both addFailure and addError (e.g. assertion failure during the test
        // body followed by an error during teardown). The JUnit XML spec allows only one status
        // child per <testcase>, so if one already exists we append the new message to it rather
        // than adding a second child element (which would break XML parsers that enforce this rule).
        Element existing = (Element) currentTest.getElementsByTagName(FAILURE).item(0);
        if (existing == null)
            existing = (Element) currentTest.getElementsByTagName(ERROR).item(0);

        if (existing != null)
        {
            final String message = t.getMessage();
            if (message != null && message.length() > 0)
            {
                String prev = existing.getAttribute(ATTR_MESSAGE);
                existing.setAttribute(ATTR_MESSAGE, prev.isEmpty() ? message : prev + " | " + message);
            }
            final String strace = JUnitTestRunner.getFilteredTrace(t);
            existing.appendChild(doc.createTextNode("\n--- additional error ---\n" + strace));
            return;
        }

        final Element nested = doc.createElement(type);
        currentTest.appendChild(nested);

        final String message = t.getMessage();
        if (message != null && message.length() > 0) {
            nested.setAttribute(ATTR_MESSAGE, t.getMessage());
        }
        nested.setAttribute(ATTR_TYPE, t.getClass().getName());

        final String strace = JUnitTestRunner.getFilteredTrace(t);
        final Text trace = doc.createTextNode(strace);
        nested.appendChild(trace);
    }

    private Element formatOutput(final String type, final String output) {
        final Element nested = doc.createElement(type);
        nested.appendChild(doc.createCDATASection(output));
        return nested;
    }

    public void testIgnored(final Test test) {
        formatSkip(test, JUnitVersionHelper.getIgnoreMessage(test));
        if (test != null) {
            ignoredTests.put(createDescription(test), test);
        }
    }


    public void formatSkip(final Test test, final String message) {
        if (test != null) {
            endTest(test);
        }

        final Element nested = doc.createElement("skipped");

        if (message != null) {
            nested.setAttribute("message", message);
        }

        Element currentTest;
        if (test != null) {
            currentTest = testElements.get(createDescription(test));
        } else {
            currentTest = rootElement;
        }

        currentTest.appendChild(nested);

    }

    public void testAssumptionFailure(final Test test, final Throwable failure) {
        formatSkip(test, failure.getMessage());
        skippedTests.put(createDescription(test), test);

    }
} // XMLJUnitResultFormatter
