/*

 * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jpackage.internal;

import java.io.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.util.ArrayList;

import java.util.List;

final class WindowsRegistry {

    // Currently we only support HKEY_LOCAL_MACHINE. Native implementation will

    // require support for additinal HKEY if needed.

    private static final int HKEY_LOCAL_MACHINE = 1;

    static {

        System.loadLibrary("jpackage");

    }

    private WindowsRegistry() {}

    /**

     * Reads the registry value for DisableRealtimeMonitoring.

     * @return true if DisableRealtimeMonitoring is set to 0x1,

     *         false otherwise.

     */

    static final boolean readDisableRealtimeMonitoring() {

        final String subKey = "Software\\Microsoft\\"

                  + "Windows Defender\\Real-Time Protection";

        final String value = "DisableRealtimeMonitoring";

        int result = readDwordValue(HKEY_LOCAL_MACHINE, subKey, value, 0);

        return (result == 1);

    }

    static final List<String> readExclusionsPaths() {

        List<String> result = new ArrayList<>();

        final String subKey = "Software\\Microsoft\\"

                + "Windows Defender\\Exclusions\\Paths";

        long lKey = openRegistryKey(HKEY_LOCAL_MACHINE, subKey);

        if (lKey == 0) {

            return result;

        }

        String valueName;

        int index = 0;

        do {

            valueName = enumRegistryValue(lKey, index);

            if (valueName != null) {

                result.add(valueName);

                index++;

            }

        } while (valueName != null);

        closeRegistryKey(lKey);

        return result;

    }

    /**

     * Reads DWORD registry value.

     *

     * @param key one of HKEY predefine value

     * @param subKey registry sub key

     * @param value value to read

     * @param defaultValue default value in case if subKey or value not found

     *                     or any other errors occurred

     * @return value's data only if it was read successfully, otherwise

     *         defaultValue

     */

    private static native int readDwordValue(int key, String subKey,

            String value, int defaultValue);

    /**

     * Open registry key.

     *

     * @param key one of HKEY predefine value

     * @param subKey registry sub key

     * @return native handle to open key

     */

    private static native long openRegistryKey(int key, String subKey);

    /**

     * Enumerates the values for registry key.

     *

     * @param lKey native handle to open key returned by openRegistryKey

     * @param index index of value starting from 0. Increment until this

     *              function returns NULL which means no more values.

     * @return returns value or NULL if error or no more data

     */

    private static native String enumRegistryValue(long lKey, int index);

    /**

     * Close registry key.

     *

     * @param lKey native handle to open key returned by openRegistryKey

     */

    private static native void closeRegistryKey(long lKey);

    /**

     *

     * @param path1 path to compare

     * @param path2 path to compare

     * @return true if paths point to same location

     */

    public static native boolean comparePaths(String path1, String path2);

}