package org.apache.tomcat.maven.it;

/*
 * 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.
 */


import org.apache.http.HttpResponse;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.maven.it.VerificationException;
import org.apache.maven.it.Verifier;
import org.apache.maven.it.util.ResourceExtractor;
import org.junit.After;
import org.junit.Before;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.Collections;
import java.util.List;

/**
 * Base class for all tests which have a war-project using the tomcat-maven-plugin below project-resources.
 *
 * @author Mark Michaelis
 */
public abstract class AbstractWarProjectIT
{
    protected Logger logger = LoggerFactory.getLogger( getClass() );

    /**
     * This URL will be queried for content. It will also be used to wait for the startup of the webapp.
     *
     * @return the URL to ping
     */
    protected abstract String getWebappUrl();

    /**
     * Artifact ID of the war project. Needed to uninstall any artifacts.
     *
     * @return artifact ID of the war project under test
     */
    protected abstract String getWarArtifactId();

    /**
     * HttpClient to use to connect to the deployed web-application.
     */
    private CloseableHttpClient httpClient;

    /**
     * Helper for Maven-Integration-Tests.
     */
    protected Verifier verifier;

    /**
     * Where the war project got placed to.
     */
    protected File webappHome;

    @Before
    public void setUp()
        throws Exception
    {

        httpClient = HttpClientBuilder.create().build();

        webappHome = ResourceExtractor.simpleExtractResources( getClass(), "/" + getWarArtifactId() );
        verifier = new Verifier( webappHome.getAbsolutePath() );

        boolean debugVerifier = Boolean.getBoolean( "verifier.maven.debug" );

        verifier.setMavenDebug( debugVerifier );
        verifier.setDebugJvm( Boolean.getBoolean( "verifier.debugJvm" ) );
        verifier.displayStreamBuffers();

        verifier.deleteArtifact( "org.apache.tomcat.maven.it", getWarArtifactId(), "1.0-SNAPSHOT", "war" );
    }

    @After
    public void tearDown()
        throws Exception
    {
        httpClient.close();
        verifier.resetStreams();
        verifier.deleteArtifact( "org.apache.tomcat.maven.it", getWarArtifactId(), "1.0-SNAPSHOT", "war" );
    }

    /**
     * Executes mvn verify and retrieves the response from the web application.
     *
     * @return the response given
     * @throws VerificationException if the verifier failed to execute the goal
     * @throws InterruptedException  if the execution got interrupted in some way
     */
    protected final String executeVerifyWithGet()
        throws VerificationException, InterruptedException, IOException
    {
        final String[] responseBodies = new String[]{ null };

        final Thread thread = new Thread( "webapp-response-retriever" )
        {
            @Override
            public void run()
            {
                responseBodies[0] = getResponseBody( getTimeout() );
            }
        };

        thread.start();

        logger.info( "Executing verify on " + webappHome.getAbsolutePath() );

        verifier.setCliOptions( getCliOptions() );

        verifier.executeGoal( getGoal() );

        verifier.displayStreamBuffers();

        thread.join();

        return responseBodies[0];
    }


    protected String getGoal()
    {
        return "verify";
    }

    protected List<String> getCliOptions()
    {
        return Collections.emptyList();
    }

    private String getResponseBody( int timeout )
    {
        String responseBody = null;
        final long startTime = System.currentTimeMillis();
        final long endTime = startTime + timeout;
        long currentTime = System.currentTimeMillis();
        try
        {
            while ( pingUrl() != 200 && currentTime < endTime )
            {
                logger.debug( "Ping..." );
                Thread.sleep( 500 );
                currentTime = System.currentTimeMillis();
            }
            if ( currentTime < endTime )
            {
                responseBody = getResponseBody();
                logger.debug( "Received: " + responseBody );
            }
            else
            {
                logger.error( "Timeout met while trying to access web application." );
            }
        }
        catch ( IOException e )
        {
            logger.error( "Exception while trying to access web application.", e );
        }
        catch ( InterruptedException e )
        {
            logger.error( "Exception while trying to access web application.", e );
        }
        return responseBody;
    }

    private String getResponseBody()
        throws IOException
    {
        HttpGet httpGet = new HttpGet( getWebappUrl() );
        httpGet.setConfig( RequestConfig.custom() //
                               .setSocketTimeout( getTimeout() ) //
                               .setConnectTimeout( getTimeout() ) //
                               .build() );
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        return httpClient.execute( httpGet, responseHandler );
    }

    private int pingUrl()
    {
        final HttpHead httpHead = new HttpHead( getWebappUrl() );
        try
        {
            final HttpResponse response = httpClient.execute( httpHead );
            return response.getStatusLine().getStatusCode();
        }
        catch ( IOException e )
        {
            logger.debug( "Ignoring exception while pinging URL " + httpHead.getURI(), e );
            return -1;
        }
    }

    protected int getTimeout()
    {
        return 15000;
    }

    protected static String getHttpItPort()
    {
        return System.getProperty( "its.http.port" );
    }

    protected static String getHttpsItPort()
    {
        return System.getProperty( "its.https.port" );
    }

    protected static String getAjpItPort()
    {
        return System.getProperty( "its.ajp.port" );
    }

}