/*****************************************************************************
 * Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License Version
 * 1.0 (the "License"). You may not use this file except in compliance with
 * the License. A copy of the License is available at http://www.sun.com/
 *
 * The Original Code is the CVS Client Library.
 * The Initial Developer of the Original Code is Robert Greig.
 * Portions created by Robert Greig are Copyright (C) 2000.
 * All Rights Reserved.
 *
 * Contributor(s): Robert Greig.
 *****************************************************************************/
package org.netbeans.lib.cvsclient.response;

import java.io.*;
import java.util.*;
import java.text.*;

import org.netbeans.lib.cvsclient.admin.*;
import org.netbeans.lib.cvsclient.event.*;
import org.netbeans.lib.cvsclient.file.*;
import org.netbeans.lib.cvsclient.util.*;

/**
 * Sends a diff of a particular file, indicating that the file currently
 * checked-out needs to be updated by the patch sent with this response.
 * @author  Milos Kleint
 */
class RcsDiffResponse implements Response {

    private static final boolean DEBUG = false;

    /**
     * The local path of the new file.
     */
    private String localPath;

    /**
     * The full repository path of the file.
     */
    private String repositoryPath;

    /**
     * The entry line.
     */
    private String entryLine;

    /**
     * The file mode.
     */
    private String mode;

    /**
     * fullpath to the file being processed.
     */
    protected String localFile;
    
    /** 
     * The date Formatter used to parse and format dates.
     * Format is: "EEE MMM dd HH:mm:ss yyyy"
     */
    private DateFormat dateFormatter;

    /**
     * Process the data for the response.
     * @param r the buffered reader allowing the client to read the server's
     * response. Note that the actual response name has already been read
     * and the reader is positioned just before the first argument, if any.
     * @param services various services that are useful to response handlers
     * @throws ResponseException if something goes wrong handling this response
     */
    public void process(LoggedDataInputStream dis, ResponseServices services)
            throws ResponseException {
        try {
            localPath = dis.readLine();
            repositoryPath = dis.readLine();
            entryLine = dis.readLine();
            mode = dis.readLine();

            String nextLine = dis.readLine();

            boolean useGzip = (nextLine.charAt(0) == 'z');

            int length = Integer.parseInt(useGzip ? nextLine.substring(1)
                                          : nextLine);

            if (DEBUG) {
                System.err.println("Got update response."); //NOI18N
                System.err.println("LocalPath is          : " + localPath); //NOI18N
                System.err.println("Repository path is    : " + repositoryPath); //NOI18N
                System.err.println("Entries line is       : " + entryLine); //NOI18N
                System.err.println("Mode is               : " + mode); //NOI18N
                System.err.println("Next line (length) is : " + nextLine); //NOI18N
                System.err.println("File length is        : " + length); //NOI18N
            }

            // now read in the file
            final String filePath = services.convertPathname(localPath,
                                                             repositoryPath);

            final File newFile = new File(filePath);
            localFile = newFile.getAbsolutePath();
            final Entry entry = new Entry(entryLine);

            FileHandler fileHandler = useGzip ? services.getGzipFileHandler()
                    : services.getUncompressedFileHandler();
            //              FileHandler fileHandler = useGzip ? getGzippedFileHandler()
            //                                                : getUncompressedFileHandler();
            fileHandler.setNextFileDate(services.getNextFileDate());

            // check if the file is binary
            if (entry.isBinary()) {
                // should actually not happen. it's possible to send pathces for text files only..
                //TODO add BugLog print here
            }
            else {
                fileHandler.writeRcsDiffFile(filePath, mode, dis, length);
            }

            // we set the date the file was last modified in the Entry line
            // so that we can easily determine whether the file has been
            // untouched
            // for files with conflicts skip the setting of the conflict field.
            //NOT SURE THIS IS NESSESARY HERE..
            String conflictString = null;
            if ((entry.getConflict() != null) &&
                    (entry.getConflict().charAt(0) == Entry.HAD_CONFLICTS)) {
                if (entry.getConflict().charAt(1) ==
                        Entry.TIMESTAMP_MATCHES_FILE) {
                    final Date d = new Date(newFile.lastModified());
                    conflictString = getEntryConflict(d, true);
                }
                else {
                    conflictString = entry.getConflict().substring(1);
                }
            }
            else {
                final Date d = new Date(newFile.lastModified());
                conflictString = getEntryConflict(d, false);
            }
            entry.setConflict(conflictString);

            // update the admin files (i.e. within the CVS directory)
            services.updateAdminData(localPath, repositoryPath, entry);

            FileUpdatedEvent e = new FileUpdatedEvent(this, filePath);
            services.getEventManager().fireCVSEvent(e);
            //System.err.println("Finished writing file");
        }
        catch (IOException e) {
            throw new ResponseException(e);
        }
    }

    /**
     * Returns the Conflict field for the file's entry.
     * Can be overriden by subclasses.
     * (For example the MergedResponse that sets the "result of merge" there.)
     * @param date the date to put in
     * @param hadConflicts if there were conflicts (e.g after merge)
     * @return the conflict field
     */
    protected String getEntryConflict(Date date, boolean hadConflicts) {
        return getDateFormatter().format(date);
    }

    /**
     * Is this a terminal response, i.e. should reading of responses stop
     * after this response. This is true for responses such as OK or
     * an error response
     */
    public boolean isTerminalResponse() {
        return false;
    }
    
    /**
     * Returns the DateFormatter instance that parses and formats date Strings.
     * The exact format matches the one in Entry.getLastModifiedDateFormatter() method.
     *
     */
    protected DateFormat getDateFormatter() {
        if (dateFormatter == null) {
            dateFormatter = new SimpleDateFormat(Entry.getLastModifiedDateFormatter().toPattern(), Locale.US);
            dateFormatter.setTimeZone(TimeZone.getTimeZone("GMT+0000")); //NOI18N
        }
        return dateFormatter;
    }
    
}