/*
 * zip.java
 *
 * Copyright (C) 2005 Peter Graves
 * $Id$
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

package org.armedbear.lisp;

import static org.armedbear.lisp.Lisp.*;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

// ### zip pathname pathnames
public final class zip extends Primitive
{
    private zip()
    {
        super("zip", PACKAGE_SYS, true, "pathname pathnames &optional topdir");
    }

    @Override
    public LispObject execute(LispObject first, LispObject second)

    {
        Pathname zipfilePathname = coerceToPathname(first);
        byte[] buffer = new byte[4096];
        try {
            String zipfileNamestring = zipfilePathname.getNamestring();
            if (zipfileNamestring == null)
                return error(new SimpleError("Pathname has no namestring: " +
                                              zipfilePathname.writeToString()));
            ZipOutputStream out =
                new ZipOutputStream(new FileOutputStream(zipfileNamestring));
            LispObject list = second;
            while (list != NIL) {
                Pathname pathname = coerceToPathname(list.car());
                String namestring = pathname.getNamestring();
                if (namestring == null) {
                    // Clean up before signalling error.
                    out.close();
                    File zipfile = new File(zipfileNamestring);
                    zipfile.delete();
                    return error(new SimpleError("Pathname has no namestring: " +
                                                  pathname.writeToString()));
                }
                File file = new File(namestring);
                FileInputStream in = new FileInputStream(file);
                ZipEntry entry = new ZipEntry(file.getName());
                out.putNextEntry(entry);
                int n;
                while ((n = in.read(buffer)) > 0)
                    out.write(buffer, 0, n);
                out.closeEntry();
                in.close();
                list = list.cdr();
            }
            out.close();
        }
        catch (IOException e) {
            return error(new LispError(e.getMessage()));
        }
        return zipfilePathname;
    }

    @Override
    public LispObject execute(LispObject first, LispObject second, LispObject third)
    {
        Pathname zipfilePathname = coerceToPathname(first);
        byte[] buffer = new byte[4096];
        try {
            String zipfileNamestring = zipfilePathname.getNamestring();
            if (zipfileNamestring == null)
                return error(new SimpleError("Pathname has no namestring: " +
                                              zipfilePathname.writeToString()));
            ZipOutputStream out =
                new ZipOutputStream(new FileOutputStream(zipfileNamestring));
            Pathname root = (Pathname)coerceToPathname(third);
            String rootPath = root.getDirectoryNamestring();
            int rootPathLength = rootPath.length();
            Set<String> directories = new HashSet<String>();
            LispObject list = second;
            while (list != NIL) {
                Pathname pathname = coerceToPathname(list.car());
                String namestring = pathname.getNamestring();
                if (namestring == null) {
                    // Clean up before signalling error.
                    out.close();
                    File zipfile = new File(zipfileNamestring);
                    zipfile.delete();
                    return error(new SimpleError("Pathname has no namestring: " +
                                                  pathname.writeToString()));
                }
                String directory = "";
                String dir = pathname.getDirectoryNamestring();
                if (dir.length() > rootPathLength) {
                  String d = dir.substring(rootPathLength);
                  int i = 0;
                  int j;
                  while ((j = d.indexOf(Pathname.separator, i)) != -1) {
                    i = j + 1;
                    directory = d.substring(0, j) + Pathname.separator;
                    if (!directories.contains(directory)) {
                      directories.add(directory);
                      ZipEntry entry = new ZipEntry(directory);
                      out.putNextEntry(entry);
                      out.closeEntry();
                    }
                  }
                }
                File file = new File(namestring);
                if (file.isDirectory()) {
                    list = list.cdr();
                    continue;
                }
                FileInputStream in = new FileInputStream(file);
                ZipEntry entry = new ZipEntry(directory + file.getName());
                out.putNextEntry(entry);
                int n;
                while ((n = in.read(buffer)) > 0)
                    out.write(buffer, 0, n);
                out.closeEntry();
                in.close();
                list = list.cdr();
            }
            out.close();
        }
        catch (IOException e) {
            return error(new LispError(e.getMessage()));
        }
        return zipfilePathname;
    }


    private static final Primitive zip = new zip();
}