/*
 * Copyright 2004 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.lowagie.text.pdf;

import java.io.OutputStream;
import java.security.cert.Certificate;
import java.util.List;

import com.lowagie.text.DocWriter;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.interfaces.PdfEncryptionSettings;
import com.lowagie.text.pdf.interfaces.PdfViewerPreferences;

/**
 * Concatenates PDF documents including form fields. The rules for the form field
 * concatenation are the same as in Acrobat. All the documents are kept in memory unlike
 * PdfCopy.
 * @author  Paulo Soares (psoares@consiste.pt)
 */
public class PdfCopyFields
	implements PdfViewerPreferences, PdfEncryptionSettings {
    
    private PdfCopyFieldsImp fc;
    
    /**
     * Creates a new instance.
     * @param os the output stream
     * @throws DocumentException on error
     */    
    public PdfCopyFields(OutputStream os) throws DocumentException {
        fc = new PdfCopyFieldsImp(os);
    }
    
    /**
     * Creates a new instance.
     * @param os the output stream
     * @param pdfVersion the pdf version the output will have
     * @throws DocumentException on error
     */    
    public PdfCopyFields(OutputStream os, char pdfVersion) throws DocumentException {
        fc = new PdfCopyFieldsImp(os, pdfVersion);
    }
    
    /**
     * Concatenates a PDF document.
     * @param reader the PDF document
     * @throws DocumentException on error
     */    
    public void addDocument(PdfReader reader) throws DocumentException {
        fc.addDocument(reader);
    }
    
    /**
     * Concatenates a PDF document selecting the pages to keep. The pages are described as a
     * <CODE>List</CODE> of <CODE>Integer</CODE>. The page ordering can be changed but
     * no page repetitions are allowed.
     * @param reader the PDF document
     * @param pagesToKeep the pages to keep
     * @throws DocumentException on error
     */    
    public void addDocument(PdfReader reader, List pagesToKeep) throws DocumentException {
        fc.addDocument(reader, pagesToKeep);
    }

    /**
     * Concatenates a PDF document selecting the pages to keep. The pages are described as
     * ranges. The page ordering can be changed but
     * no page repetitions are allowed.
     * @param reader the PDF document
     * @param ranges the comma separated ranges as described in {@link SequenceList}
     * @throws DocumentException on error
     */    
    public void addDocument(PdfReader reader, String ranges) throws DocumentException {
        fc.addDocument(reader, SequenceList.expand(ranges, reader.getNumberOfPages()));
    }

    /** Sets the encryption options for this document. The userPassword and the
     *  ownerPassword can be null or have zero length. In this case the ownerPassword
     *  is replaced by a random string. The open permissions for the document can be
     *  AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
     *  AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
     *  The permissions can be combined by ORing them.
     * @param userPassword the user password. Can be null or empty
     * @param ownerPassword the owner password. Can be null or empty
     * @param permissions the user permissions
     * @param strength128Bits <code>true</code> for 128 bit key length, <code>false</code> for 40 bit key length
     * @throws DocumentException if the document is already open
     */
    public void setEncryption(byte userPassword[], byte ownerPassword[], int permissions, boolean strength128Bits) throws DocumentException {
    	fc.setEncryption(userPassword, ownerPassword, permissions, strength128Bits ? PdfWriter.STANDARD_ENCRYPTION_128 : PdfWriter.STANDARD_ENCRYPTION_40);
    }
    
    /**
     * Sets the encryption options for this document. The userPassword and the
     *  ownerPassword can be null or have zero length. In this case the ownerPassword
     *  is replaced by a random string. The open permissions for the document can be
     *  AllowPrinting, AllowModifyContents, AllowCopy, AllowModifyAnnotations,
     *  AllowFillIn, AllowScreenReaders, AllowAssembly and AllowDegradedPrinting.
     *  The permissions can be combined by ORing them.
     * @param strength true for 128 bit key length. false for 40 bit key length
     * @param userPassword the user password. Can be null or empty
     * @param ownerPassword the owner password. Can be null or empty
     * @param permissions the user permissions
     * @throws DocumentException if the document is already open
     */
    public void setEncryption(boolean strength, String userPassword, String ownerPassword, int permissions) throws DocumentException {
        setEncryption(DocWriter.getISOBytes(userPassword), DocWriter.getISOBytes(ownerPassword), permissions, strength);
    }
 
    /**
     * Closes the output document.
     */    
    public void close() {
        fc.close();
    }

    /**
     * Opens the document. This is usually not needed as addDocument() will do it
     * automatically.
     */    
    public void open() {
        fc.openDoc();
    }

    /**
     * Adds JavaScript to the global document
     * @param js the JavaScript
     */    
    public void addJavaScript(String js) {
        fc.addJavaScript(js, !PdfEncodings.isPdfDocEncoding(js));
    }

    /**
     * Sets the bookmarks. The list structure is defined in
     * <CODE>SimpleBookmark#</CODE>.
     * @param outlines the bookmarks or <CODE>null</CODE> to remove any
     */    
    public void setOutlines(List outlines) {
        fc.setOutlines(outlines);
    }
    
    /** Gets the underlying PdfWriter.
     * @return the underlying PdfWriter
     */    
    public PdfWriter getWriter() {
        return fc;
    }

    /**
     * Gets the 1.5 compression status.
     * @return <code>true</code> if the 1.5 compression is on
     */
    public boolean isFullCompression() {
        return fc.isFullCompression();
    }
    
    /**
     * Sets the document's compression to the new 1.5 mode with object streams and xref
     * streams. It can be set at any time but once set it can't be unset.
     * <p>
     * If set before opening the document it will also set the pdf version to 1.5.
     */
    public void setFullCompression() {
        fc.setFullCompression();
    }

	/**
	 * @see com.lowagie.text.pdf.interfaces.PdfEncryptionSettings#setEncryption(byte[], byte[], int, int)
	 */
	public void setEncryption(byte[] userPassword, byte[] ownerPassword, int permissions, int encryptionType) throws DocumentException {
		fc.setEncryption(userPassword, ownerPassword, permissions, encryptionType);
	}

	/**
	 * @see com.lowagie.text.pdf.interfaces.PdfViewerPreferences#addViewerPreference(com.lowagie.text.pdf.PdfName, com.lowagie.text.pdf.PdfObject)
	 */
	public void addViewerPreference(PdfName key, PdfObject value) {
		fc.addViewerPreference(key, value);	
	}

	/**
	 * @see com.lowagie.text.pdf.interfaces.PdfViewerPreferences#setViewerPreferences(int)
	 */
	public void setViewerPreferences(int preferences) {
		fc.setViewerPreferences(preferences);
	}

	/**
	 * @see com.lowagie.text.pdf.interfaces.PdfEncryptionSettings#setEncryption(java.security.cert.Certificate[], int[], int)
	 */
	public void setEncryption(Certificate[] certs, int[] permissions, int encryptionType) throws DocumentException {
		fc.setEncryption(certs, permissions, encryptionType);
	}    
}