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/*
 * 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.tuscany.sca.binding.atom;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Date;

import junit.framework.Assert;

import org.apache.abdera.Abdera;
import org.apache.abdera.factory.Factory;
import org.apache.abdera.i18n.iri.IRI;
import org.apache.abdera.model.Collection;
import org.apache.abdera.model.Content;
import org.apache.abdera.model.Entry;
import org.apache.abdera.model.Feed;
import org.apache.abdera.parser.Parser;
import org.apache.abdera.protocol.Response.ResponseType;
import org.apache.abdera.protocol.client.AbderaClient;
import org.apache.abdera.protocol.client.ClientResponse;
import org.apache.abdera.protocol.client.RequestOptions;
import org.apache.tuscany.sca.node.Contribution;
import org.apache.tuscany.sca.node.ContributionLocationHelper;
import org.apache.tuscany.sca.node.Node;
import org.apache.tuscany.sca.node.NodeFactory;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

/**
 * Tests use of server provided feed entity tags for Atom binding in Tuscany.
 * Tests conditional gets (e.g. get if-none-match) or conditional posts (post if-match)
 * using entity tags and last modified entries in headers. 
 * Uses the SCA provided Provider composite to act as a server.
 * Uses the Abdera provided Client to act as a client.
 * 
 * @version $Rev: 823832 $ $Date: 2009-10-10 09:14:20 +0000 (Sat, 10 Oct 2009) $
 */
public class ProviderFeedEntityTagsTestCase {
    public final static String providerURI = "http://localhost:8084/customer";

    protected static Node scaProviderNode;

    protected static CustomerClient testService;
    protected static Abdera abdera;
    protected static AbderaClient client;
    protected static Parser abderaParser;    
    protected static String eTag;
    protected static Date lastModified;
    protected static final SimpleDateFormat dateFormat = new SimpleDateFormat( "EEE, dd MMM yyyy HH:mm:ss Z" ); // RFC 822 date time

    @BeforeClass
    public static void init() throws Exception {
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.init");
        String contribution = ContributionLocationHelper.getContributionLocation(ProviderEntryEntityTagsTestCase.class);

        scaProviderNode = NodeFactory.newInstance().createNode("org/apache/tuscany/sca/binding/atom/Provider.composite", new Contribution("provider", contribution));
        scaProviderNode.start();

        abdera = new Abdera();
        client = new AbderaClient(abdera);
        abderaParser = Abdera.getNewParser();
    }

    @AfterClass
    public static void destroy() throws Exception {
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.destroy");
        if (scaProviderNode != null) {
            scaProviderNode.stop();
            scaProviderNode.destroy();
        }
    }

    @Test
    public void testPrelim() throws Exception {
        Assert.assertNotNull(scaProviderNode);
        Assert.assertNotNull( client );
    }

    @Test
    public void testFeedBasics() throws Exception {    
        // System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedBasics");
        // Normal feed request
        ClientResponse res = client.get(providerURI);
        Assert.assertNotNull(res);
        try {
            // Assert feed provided since no predicates
            Assert.assertEquals(200, res.getStatus());
            Assert.assertEquals(ResponseType.SUCCESS, res.getType());
            // AtomTestCaseUtils.printResponseHeaders( "Feed response headers:", "   ", res );
            // System.out.println("Feed response content:");
            // AtomTestCaseUtils.prettyPrint(abdera, res.getDocument());

            // Perform other tests on feed.
            // Warning. AbderaClient.getEntityTag is very particular on tag pattern.
            // Document<Feed> doc = res.getDocument();
            String body = read( res.getInputStream() );
            // RFC 4287 requires non-null id, title, updated elements
            Assert.assertTrue( -1 != body.indexOf( "</id>" ));
            Assert.assertTrue( -1 != body.indexOf( "</title>" ));
            Assert.assertTrue( -1 != body.indexOf( "</updated>" ));

            eTag = res.getHeader("ETag");
            Assert.assertNotNull( eTag );
            lastModified = res.getLastModified();
            Assert.assertNotNull( lastModified );
        } finally {
            res.release();
        }
    }    

    @Test
    public void testUnmodifiedGetIfMatch() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedUnmodifiedGetIfMatch");
        // Feed request with predicates
        RequestOptions opts = new RequestOptions();
        final String contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-Match", eTag);

        ClientResponse res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            String thisETag = res.getHeader("ETag");
            Assert.assertNotNull( thisETag );
            Date thisLastModified = res.getLastModified();
            Assert.assertNotNull( thisLastModified );

            // Should return 200 - Feed provided since it matches etag.
            Assert.assertEquals(200, res.getStatus());
            Assert.assertEquals(ResponseType.SUCCESS, res.getType());
            // AtomTestCaseUtils.printResponseHeaders( "Feed response headers:", "   ", res );
            // System.out.println("Feed response content:");
            // AtomTestCaseUtils.prettyPrint(abdera, res.getDocument());
        } finally {
            res.release();
        }
    }    

    @Test
    public void testUnmodifiedGetIfNoneMatch() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedUnmodifiedGetIfNoneMatch");
        // Feed request with predicates
        RequestOptions opts = new RequestOptions();
        final String contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-None-Match", eTag);

        ClientResponse res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            // Should return 304 - Feed not provided since it matches ETag.
            Assert.assertEquals(304, res.getStatus());
        } finally {
            res.release();
        }
    }    

    // @Test @Ignore Intermitently fails, see TUSCANY-3299
    public void testUnmodifiedGetIfUnModified() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedUnmodifiedGetIfUnModified");
        // Feed request with predicates
        RequestOptions opts = new RequestOptions();
        final String contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-Unmodified-Since", dateFormat.format( new Date() ));

        ClientResponse res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            // Should return 304 - Feed not provided since feed is modified since.
            Assert.assertEquals(304, res.getStatus());
        } finally {
            res.release();
        }
    }    

    @Test
    public void testUnmodifiedGetIfModified() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedUnmodifiedGetIfModified");
        // Feed request with predicates
        RequestOptions opts = new RequestOptions();
        final String contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-Modified-Since", dateFormat.format( new Date( 0 ) ));

        ClientResponse res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            // Should return 200 - Feed provided since feed is changed.
            Assert.assertEquals(200, res.getStatus());
            Assert.assertEquals(ResponseType.SUCCESS, res.getType());

            String thisETag = res.getHeader("ETag");
            Assert.assertNotNull( thisETag );
            Date thisLastModified = res.getLastModified();
            Assert.assertNotNull( thisLastModified );                        
        } finally {
            res.release();
        }
    }    

    @Test
    public void testModifiedGetIfNoneMatch() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedModifiedGetIfNoneMatch");
        // Post some new content to the feed.
        Factory factory = abdera.getFactory();
        String customerName = "Fred Farkle";
        Entry entry = factory.newEntry();
        entry.setTitle("customer " + customerName);
        entry.setUpdated(new Date());
        entry.addAuthor("Apache Tuscany");
        Content content = abdera.getFactory().newContent();
        content.setContentType(Content.Type.TEXT);
        content.setValue(customerName);
        entry.setContentElement(content);

        RequestOptions opts = new RequestOptions();
        String contentType = "application/atom+xml; type=entry"; 
        opts.setContentType(contentType);
        IRI colUri = new IRI(providerURI).resolve("customer");
        ClientResponse res = client.post(colUri.toString(), entry, opts);

        // Feed request with predicates
        opts = new RequestOptions();
        contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-None-Match", eTag);

        res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            // Should return 304 - Feed not provided since it matches ETag.
            Assert.assertEquals(304, res.getStatus());
            // AtomTestCaseUtils.printResponseHeaders( "Feed response headers:", "   ", res );
            // System.out.println("Feed response content:");
            // AtomTestCaseUtils.prettyPrint(abdera, res.getDocument());
        } finally {
            res.release();
        }
    }    

    @Test
    public void testModifiedGetIfMatch() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedModifiedGetIfMatch");
        // Feed request with predicates
        RequestOptions opts = new RequestOptions();
        final String contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-Match", eTag);

        ClientResponse res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            String thisETag = res.getHeader("ETag");
            Assert.assertNotNull( thisETag );
            Date thisLastModified = res.getLastModified();
            Assert.assertNotNull( thisLastModified );

            // Should return 200 - value since feed is changed
            Assert.assertEquals(200, res.getStatus());
            Assert.assertEquals(ResponseType.SUCCESS, res.getType());

            // AtomTestCaseUtils.printResponseHeaders( "Feed modified if-none-match response headers:", "   ", res );
            // System.out.println("Feed response content:");
            // AtomTestCaseUtils.prettyPrint(abdera, res.getDocument());
        } finally {
            res.release();
        }
    }    

    @Test
    public void testModifiedGetIfUnModified() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedUnmodifiedGetIfUnModified");
        // Feed request with predicates
        RequestOptions opts = new RequestOptions();
        final String contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-Unmodified-Since", dateFormat.format( new Date() ));

        ClientResponse res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            // Should return 304 - Feed not provided since feed is modified since.      
            Assert.assertEquals(304, res.getStatus());
        } finally {
            res.release();
        }
    }    

    @Test
    public void testModifiedGetIfModified() throws Exception {    
        //System.out.println(">>>ProviderFeedEntityTagsTestCase.testFeedUnmodifiedGetIfModified");
        // Feed request with predicates
        RequestOptions opts = new RequestOptions();
        final String contentType = "application/atom+xml"; 
        opts.setContentType(contentType);
        opts.setHeader( "If-Modified-Since", dateFormat.format( lastModified ));

        ClientResponse res = client.get(providerURI, opts);
        Assert.assertNotNull(res);
        try {
            // Should return 200 - Feed provided since feed is changed.
            Assert.assertEquals(200, res.getStatus());
            Assert.assertEquals(ResponseType.SUCCESS, res.getType());

            String thisETag = res.getHeader("ETag");
            Assert.assertNotNull( thisETag );
            Date thisLastModified = res.getLastModified();
            Assert.assertNotNull( thisLastModified );                        
        } finally {
            res.release();
        }
    }    


    public static void printFeed( String title, String indent, Feed feed ) {
        if ( feed == null ) {
            System.out.println( title + " feed is null");
            return;
        }

        System.out.println( title );
        System.out.println( indent + "id=" + feed.getId() );
        System.out.println( indent + "title=" + feed.getTitle() );
        System.out.println( indent + "updated=" + feed.getUpdated() );
        System.out.println( indent + "author=" + feed.getAuthor() );
        Collection collection = feed.getCollection();
        if ( collection == null ) {
            System.out.println( indent + "collection=null" );
        } else {
            System.out.println( indent + "collection=" + collection );
        }
        // System.out.println( indent + "collection size=" + feed.getCollection() );
        // for (Collection collection : workspace.getCollections()) {
        //    if (collection.getTitle().equals("customers")) {
        //       String expected = uri + "customers";
        //       String actual = collection.getResolvedHref().toString();
        //       assertEquals(expected, actual);
        //    }
        // }

    }

    /**
     * Read response ream from the given socket.
     * @param socket
     * @return
     * @throws IOException
     */
    private static String read(InputStream inputStream) throws IOException {
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new InputStreamReader( inputStream ));
            StringBuffer sb = new StringBuffer();
            String str;
            while ((str = reader.readLine()) != null) {
                sb.append(str);
            }
            return sb.toString();
        } finally {
            if (reader != null) {
                reader.close();
            }
        }
    }
}
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