/*

 * Copyright (c) 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.util.ArrayList;

import java.util.List;

import java.util.Objects;

/**

 * Dotted numeric version string.

 * E.g.: 1.0.37, 10, 0.5

 */

class DottedVersion implements Comparable<String> {

    public DottedVersion(String version) {

        components = parseVersionString(version);

        value = version;

    }

    @Override

    public int compareTo(String o) {

        int result = 0;

        int[] otherComponents = parseVersionString(o);

        for (int i = 0; i < Math.min(components.length, otherComponents.length)

                && result == 0; ++i) {

            result = components[i] - otherComponents[i];

        }

        if (result == 0) {

            result = components.length - otherComponents.length;

        }

        return result;

    }

    private static int[] parseVersionString(String version) {

        Objects.requireNonNull(version);

        if (version.isEmpty()) {

            throw new IllegalArgumentException("Version may not be empty string");

        }

        int lastNotZeroIdx = -1;

        List<Integer> components = new ArrayList<>();

        for (var component : version.split("\\.", -1)) {

            if (component.isEmpty()) {

                throw new IllegalArgumentException(String.format(

                        "Version [%s] contains a zero lenght component", version));

            }

            int num = Integer.parseInt(component);

            if (num < 0) {

                throw new IllegalArgumentException(String.format(

                        "Version [%s] contains invalid component [%s]", version,

                        component));

            }

            if (num != 0) {

                lastNotZeroIdx = components.size();

            }

            components.add(num);

        }

        if (lastNotZeroIdx + 1 != components.size()) {

            // Strip trailing zeros.

            components = components.subList(0, lastNotZeroIdx + 1);

        }

        return components.stream().mapToInt(Integer::intValue).toArray();

    }

    @Override

    public String toString() {

        return value;

    }

    final private int[] components;

    final private String value;

}