/*
 * The MIT License
 *
 * Copyright (c) 2004-2009, Sun Microsystems, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.jvnet.hudson.test;

import hudson.FilePath;
import hudson.Launcher;
import hudson.Util;
import hudson.model.AbstractBuild;
import hudson.model.BuildListener;
import hudson.scm.ChangeLogParser;
import hudson.scm.NullSCM;
import hudson.scm.SCM;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.net.URL;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * {@link SCM} useful for testing that extracts the given resource as a zip file.
 *
 * @author Kohsuke Kawaguchi
 */
public class ExtractResourceWithChangesSCM extends NullSCM {
    private final URL firstZip;
    private final URL secondZip;
    private final String moduleRoot;
    
    public ExtractResourceWithChangesSCM(URL firstZip, URL secondZip) {
        if ((firstZip == null) || (secondZip == null))
            throw new IllegalArgumentException();
        this.firstZip = firstZip;
        this.secondZip = secondZip;
        this.moduleRoot = null;
    }

    public ExtractResourceWithChangesSCM(URL firstZip, URL secondZip, String moduleRoot) {
        if ((firstZip == null) || (secondZip == null))
            throw new IllegalArgumentException();
        this.firstZip = firstZip;
        this.secondZip = secondZip;
        this.moduleRoot = moduleRoot;
    }

    @Override
    public FilePath getModuleRoot(FilePath workspace) {
        if (moduleRoot!=null) {
            return workspace.child(moduleRoot);
        }
        return workspace;
    }
    
    @Override
    public boolean checkout(AbstractBuild<?,?> build, Launcher launcher, FilePath workspace, BuildListener listener, File changeLogFile) throws IOException, InterruptedException {
        if (workspace.exists()) {
            listener.getLogger().println("Deleting existing workspace " + workspace.getRemote());
            workspace.deleteRecursive();
        }
        listener.getLogger().println("Staging first zip: " + firstZip);
        workspace.unzipFrom(firstZip.openStream());
        listener.getLogger().println("Staging second zip: " + secondZip);
        workspace.unzipFrom(secondZip.openStream());

        // Get list of files changed in secondZip.
        ZipInputStream zip = new ZipInputStream(secondZip.openStream());
        ZipEntry e;
        ExtractChangeLogParser.ExtractChangeLogEntry changeLog = new ExtractChangeLogParser.ExtractChangeLogEntry(secondZip.toString());

        try {
            while ((e = zip.getNextEntry()) != null) {
                if (!e.isDirectory())
                    changeLog.addFile(new ExtractChangeLogParser.FileInZip(e.getName()));
            }
        }
        finally {
            zip.close();
        }
        saveToChangeLog(changeLogFile, changeLog);

        return true;
    }

    @Override
    public ChangeLogParser createChangeLogParser() {
        return new ExtractChangeLogParser();
    }

    private static String escapeForXml(String string) {
        return Util.xmlEscape(Util.fixNull(string));
    }

    public void saveToChangeLog(File changeLogFile, ExtractChangeLogParser.ExtractChangeLogEntry changeLog) throws IOException {
        FileOutputStream outputStream = new FileOutputStream(changeLogFile);

        PrintStream stream = new PrintStream(outputStream, false, "UTF-8");

        stream.println("<?xml version='1.0' encoding='UTF-8'?>");
        stream.println("<extractChanges>");
        stream.println("<entry>");
        stream.println("<zipFile>" + escapeForXml(changeLog.getZipFile()) + "</zipFile>");
        stream.println("<file>");

        for (String fileName : changeLog.getAffectedPaths()) {
            stream.println("<fileName>" + escapeForXml(fileName) + "</fileName>");
        }

        stream.println("</file>");
        stream.println("</entry>");
        stream.println("</extractChanges>");

        stream.close();
    }

    /**
     * Don't write 'this', so that subtypes can be implemented as anonymous class.
     */
    private Object writeReplace() { return new Object(); }
}

@@ -4711,42 +4711,8 @@
 %3E%22);
-%0A        stream.println(%22%3Cfile%3E%22);
 %0A%0A  
@@ -4768,24 +4768,62 @@
 dPaths()) %7B%0A
+            stream.println(%22%3Cfile%3E%22);%0A
             
@@ -4897,23 +4897,16 @@
 %22);%0A    
-    %7D%0A%0A
         
@@ -4924,32 +4924,43 @@
 tln(%22%3C/file%3E%22);%0A
+        %7D%0A%0A
         stream.p

Fix changelog generation in ExtractResourceWithChangesSCM when several files are changed at once (used in the fix for JENKINS-22622)