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/****************************************************************************
**
** Copyright (C) 1992-2009 Nokia. All rights reserved.
** Copyright (C) 2009-2022 Dr. Peter Droste, Omix Visualization GmbH & Co. KG. All rights reserved.
**
** This file is part of Qt Jambi.
**
** ** $BEGIN_LICENSE$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
** 
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
** 
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
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package io.qt.internal.fileengine;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.Enumeration;
import java.util.GregorianCalendar;
import java.util.HashSet;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

import io.qt.core.QDate;
import io.qt.core.QDateTime;
import io.qt.core.QDir;
import io.qt.core.QTime;

// Package private class and methods
class MyJarFile{
    private URLConnection urlConnection;  // do we need to keep this around ?
    private File fileToJarFile;    // we store this object type to differentiate between URLs and direct File IO.
    private URL urlToJarFile;  // we save this to allow for close/reopen based on just this handle
    private JarFile jarFile;
    private int refCount;

    MyJarFile(File fileToJarFile) throws IOException {
        this.fileToJarFile = fileToJarFile;
        openInternal();
    }

    MyJarFile(URL urlToJarFile) throws IOException {
        this.urlToJarFile = urlToJarFile;
        openInternal();
    }

    private void openInternal() throws IOException {
        if(fileToJarFile != null) {  // Direct File I/O Jar file
            jarFile = new JarFile(fileToJarFile);
        } else {
            urlConnection = urlToJarFile.openConnection();
            if((urlConnection instanceof JarURLConnection) == false) {
                IOException thr = new IOException("not a JarURLConnection: " + urlConnection.getClass().getName());
                urlConnection = null;  // we only keep handle when we have active Jar open
                throw thr;
            }
            JarURLConnection jarUrlConnection = (JarURLConnection) urlConnection;
            jarFile = jarUrlConnection.getJarFile();
        }
        refCount = 1;
    }

    // This method may never throw an exception
    void get() {
        synchronized(this) {
            refCount++;
        }
    }

    // This method must cause a double increment on the reopen() case
    // Returns the previous refCount, so 0 means we just reopened, non-zero means we did get()
    int getOrReopen() throws IOException {
        int oldRefCount;
        synchronized (this) {
            oldRefCount = refCount;
            if(refCount <= 0)
                reopen();
            get();
        }
        return oldRefCount;
    }

    // This method may never throw an exception
    void put() {
        JarFile closeJarFile = null;
        synchronized(this) {
            refCount--;
            if(refCount == 0) {
                closeJarFile = jarFile;
                jarFile = null;
            }
        }
        if(closeJarFile != null) {
            try {
                closeJarFile.close();
            } catch(IOException eat) {
            }
            if(urlConnection != null) {
                urlConnection = null;
            }
        }
    }

    void reopen() throws IOException {
        if(jarFile != null)
            throw new IOException("jarFile already open");
        openInternal();
    }

    String getName() {
        return jarFile.getName();
    }

    Enumeration entries() {
        return jarFile.entries();
    }

    JarEntry getJarEntry(String name) {
        return jarFile.getJarEntry(name);
    }

    InputStream getInputStream(ZipEntry ze) throws IOException {
        return jarFile.getInputStream(ze);
    }
    
    void entryList(List result, QDir.Filters filters, Collection filterNames, String mentryName){
        if (!mentryName.endsWith("/") && mentryName.length() > 0)
            mentryName = mentryName + "/";

        Enumeration entries = entries();

        HashSet used = new HashSet();
        while (entries.hasMoreElements()) {
            JarEntry entry = entries.nextElement();

            String entryName = entry.getName();

            // Must be inside this directory
            if (entryName.length() <= mentryName.length() || !mentryName.equals(entryName.substring(0, mentryName.length())) || mentryName.equals(entryName))
                continue;

            // Only one level
            boolean isDir;
            int pos = entryName.indexOf("/", mentryName.length());
            if (pos > 0) {
                entryName = entryName.substring(0, pos);
                isDir = true;
            } else {
                isDir = entry.isDirectory();
                if (!isDir)
                    isDir = QClassPathResourceManager.checkIsDirectory(this, entry);
            }

            if (!filters.isSet(QDir.Filter.Readable))
                continue ;

            if (!filters.isSet(QDir.Filter.Dirs) && isDir)
                continue ;

            if (!filters.isSet(QDir.Filter.Files) && !isDir)
                continue ;

            if (filterNames.size() > 0) {
                if ((!isDir || !filters.isSet(QDir.Filter.AllDirs))
                    && (!QDir.match(filterNames, entryName.substring(mentryName.length())))) {
                    continue;
                }
            }

            if (entryName.endsWith("/") && entryName.length() > 1)
                entryName = entryName.substring(0, entryName.length() - 1);

            entryName = entryName.substring(mentryName.length());

            if (!used.contains(entryName)) {
                used.add(entryName);
                result.add(entryName);
            }
        }
    }
    
    static QDateTime fileTime(ZipEntry ze) {
    	long tm = ze.getTime();
        if (tm == -1)
            return new QDateTime();  // the current time

        Calendar calendar = new GregorianCalendar();
        calendar.setTime(new Date(tm));

        return new QDateTime(new QDate(calendar.get(Calendar.YEAR),
                                       calendar.get(Calendar.MONTH) + 1,
                                       calendar.get(Calendar.DAY_OF_MONTH)),
                             new QTime(calendar.get(Calendar.HOUR_OF_DAY),
                                       calendar.get(Calendar.MINUTE),
                                       calendar.get(Calendar.SECOND),
                                       calendar.get(Calendar.MILLISECOND)));
    }
}