/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

import javax.mail.*;
import javax.mail.internet.*;

/*
 * Copy folder hierarchies between different Stores. This is a useful 
 * utility to populate new (and possibly empty) mail stores. Specify
 * both the source and destination folders as URLs.
 *	
 * @author John Mani
 * @author Bill Shannon
 */

public class populate {

    static boolean force = false;
    static boolean skipSpecial = false;
    static boolean clear = false;
    static boolean dontPreserveFlags = false;
    static boolean warn = false;

    public static void main(String argv[]) {
	String srcURL = null;
	String dstURL = null;
	boolean debug = false;

	int optind;

	for (optind = 0; optind < argv.length; optind++) {
	    if (argv[optind].equals("-s")) {
		srcURL = argv[++optind];
	    } else if (argv[optind].equals("-d")) {
		dstURL = argv[++optind];
	    } else if (argv[optind].equals("-D")) {
		debug = true;
	    } else if (argv[optind].equals("-f")) {
		force = true;
	    } else if (argv[optind].equals("-S")) {
		skipSpecial = true;
	    } else if (argv[optind].equals("-c")) {
		clear = true;
	    } else if (argv[optind].equals("-P")) {
		dontPreserveFlags = true;
	    } else if (argv[optind].equals("-W")) {
		warn = true;
	    } else if (argv[optind].equals("--")) {
		optind++;
		break;
	    } else if (argv[optind].startsWith("-")) {
		printUsage();
		System.exit(1);
	    } else {
		break;
	    }
	}

	try {

	    if (srcURL == null || dstURL == null) {
		printUsage();
		System.exit(1);
	    }

	    Session session = Session.getInstance(
				System.getProperties(), null);
	    session.setDebug(debug);

	    // Get source folder
	    URLName srcURLName = new URLName(srcURL);
	    Folder srcFolder;
	    // Check if the source URL has a folder specified. If
	    // not, we use the default folder
	    if (srcURLName.getFile() == null) {
		Store s = session.getStore(srcURLName);
		s.connect();
		srcFolder = s.getDefaultFolder();
	    } else {
		srcFolder = session.getFolder(new URLName(srcURL));
		if (!srcFolder.exists()) {
		    System.out.println("source folder does not exist");
		    srcFolder.getStore().close();
		    System.exit(1);
		}
	    }

	    // Set up destination folder
	    URLName dstURLName = new URLName(dstURL);
	    Folder dstFolder;
	    // Check if the destination URL has a folder specified. If
	    // not, we use the source folder name
	    if (dstURLName.getFile() == null) {
		Store s = session.getStore(dstURLName);
		s.connect();
		dstFolder = s.getFolder(srcFolder.getName());
	    } else
		dstFolder = session.getFolder(dstURLName);

	    if (clear && dstFolder.exists()) {
		if (!dstFolder.delete(true)) {
		    System.out.println("couldn't delete " +
						dstFolder.getFullName());
		    return;
		}
	    }
	    copy(srcFolder, dstFolder);

	    // Close the respective stores.
	    srcFolder.getStore().close();
	    dstFolder.getStore().close();

	} catch (MessagingException mex) {
	    System.out.println(mex.getMessage());
	    mex.printStackTrace();
	}
    }

    private static void copy(Folder src, Folder dst)
		throws MessagingException {
	System.out.println("Populating " + dst.getFullName());

	Folder ddst = dst;
	Folder[] srcFolders = null;
	if ((src.getType() & Folder.HOLDS_FOLDERS) != 0)
	    srcFolders = src.list();
	boolean srcHasChildren = srcFolders != null && srcFolders.length > 0;

	if (!dst.exists()) {
	    // Create it.
	    boolean dstHoldsOnlyFolders = false;
	    if (!dst.create(src.getType())) {
		// might not be able to create a folder that holds both
		if (!dst.create(srcHasChildren ? Folder.HOLDS_FOLDERS :
						Folder.HOLDS_MESSAGES)) {
		    // might only be able to create one type (Gmail)
		    if (!dst.create(Folder.HOLDS_MESSAGES)) {
			System.out.println("couldn't create " +
							    dst.getFullName());
			return;
		    }
		}
		dstHoldsOnlyFolders = srcHasChildren;
	    }

	    // Copy over any messges from src to dst
	    if ((src.getType() & Folder.HOLDS_MESSAGES) != 0) {
		src.open(Folder.READ_ONLY);
		if (dstHoldsOnlyFolders) {
		    if (src.getMessageCount() > 0) {
			System.out.println("Unable to copy messages from " +
			    src.getFullName() + " to " + dst.getFullName() +
			    " because destination holds only folders");
		    }
		} else
		    copyMessages(src, dst);
		src.close(false);
	    }
	} else  {
	    System.out.println(dst.getFullName() + " already exists");
	    // Copy over any messges from src to dst
	    if (force && (src.getType() & Folder.HOLDS_MESSAGES) != 0) {
		src.open(Folder.READ_ONLY);
		copyMessages(src, dst);
		src.close(false);
	    }
	}

	// Copy over subfolders
	if (srcHasChildren) {
	    for (int i = 0; i < srcFolders.length; i++) {
		// skip special directories?
		if (skipSpecial) {
		    if (srcFolders[i].getName().equals("SCCS") ||
			srcFolders[i].getName().equals("Drafts") ||
			srcFolders[i].getName().equals("Trash") ||
			srcFolders[i].getName().equals("Shared Folders"))
			continue;
		}
		copy(srcFolders[i], dst.getFolder(srcFolders[i].getName()));
	    }
	}
    }

    /**
     * Copy message from src to dst.  If dontPreserveFlags is set
     * we first copy the messages to memory, clear all the flags,
     * and then copy to the destination.
     */
    private static void copyMessages(Folder src, Folder dst)
				throws MessagingException {
	Message[] msgs = src.getMessages();
	if (dontPreserveFlags) {
	    for (int i = 0; i < msgs.length; i++) {
		MimeMessage m = new MimeMessage((MimeMessage)msgs[i]);
		m.setFlags(m.getFlags(), false);
		msgs[i] = m;
	    }
	}
	if (warn) {
	    // have to copy messages one at a time
	    for (int i = 0; i < msgs.length; i++) {
		try {
		    src.copyMessages(new Message[] { msgs[i] }, dst);
		} catch (MessagingException mex) {
		    System.out.println("WARNING: Copy of message " + (i + 1) +
			" from " + src.getFullName() +
			" to " + dst.getFullName() +
			" failed: " + mex.toString());
		}
	    }
	} else
	    src.copyMessages(msgs, dst);
    }

    private static void printUsage() {
	System.out.println("populate [-D] [-f] [-S] [-c] " +
			   "-s source_url -d dest_url");
	System.out.println("URLs are of the form: " +
			   "protocol://username:password@hostname/foldername");
	System.out.println("The destination URL does not need a foldername," +
			   " in which case, the source foldername is used");
    }
}