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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jackrabbit.vault.packaging;

import java.util.ArrayList;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import org.apache.jackrabbit.vault.util.Text;

/**
 * Implements a package version.
 * @since 2.0
 */
public class Version implements Comparable {

    /**
     * The empty version
     */
    public static final Version EMPTY = new Version("", new String[0]);

    /**
     * internal string representation
     */
    private final String str;

    /**
     * All segments of this version
     */
    private final String[] segments;

    /**
     * Creates a new version from the given string.
     *
     * @param str the version string.
     * @return the new version or {@link Version#EMPTY} if {@code str} is an empty string.
     * @since 2.2.4
     */
    @Nonnull
    public static Version create(@Nullable String str) {
        if (str == null || str.length() == 0) {
            return Version.EMPTY;
        }
        return Version.create(Text.explode(str, '.'));
    }

    /**
     * Creates a new version from version segments
     * @param segments version segments
     * @return the new version or {@link Version#EMPTY} if {@code segments} is empty.
     * @since 2.2.4
     */
    @Nonnull
    public static Version create(@Nullable String[] segments) {
        if (segments == null || segments.length == 0) {
            return Version.EMPTY;
        }
        ArrayList segs = new ArrayList(segments.length+1);
        StringBuilder str = new StringBuilder();
        boolean hasQualifier = false;
        for (String s: segments) {
            // reconstruct version string
            if (str.length() > 0) {
                str.append('.');
            }
            str.append(s);

            // split first qualifier
            if (hasQualifier) {
                segs.add(s);
            } else {
                int dash = s.indexOf('-');
                if (dash < 0) {
                    segs.add(s);
                } else if (dash > 0) {
                    hasQualifier = true;
                    segs.add(s.substring(0, dash));
                    if (dash < s.length() - 1) {
                        segs.add(s.substring(dash + 1));
                    }
                }
            }
        }
        return new Version(str.toString(), segs.toArray(new String[segs.size()]));
    }

    /**
     * Internal constructor
     * @param str string
     * @param segments segments
     */
    private Version(@Nonnull String str, @Nonnull String[] segments) {
        this.str = str;
        this.segments = segments;
    }

    @Override
    public int hashCode() {
        return str.hashCode();
    }

    @Override
    public boolean equals(Object o) {
        return this == o ||
                o instanceof Version && str.equals(((Version) o).str);

    }

    @Override
    public String toString() {
        return str;
    }

    /**
     * Returns all segments.
     * @return all segments.
     */
    public String[] getNormalizedSegments() {
        return segments;
    }

    /**
     * Compares this version to the given one, segment by segment without any special
     * "SNAPSHOT" handling.
     *
     *      * Examples:
     * "1" < "2"
     * "1.0" < "2"
     * "2.0.1" < "2.1"
     * "2.1" < "2.1.1"
     * "2.9" < "2.11"
     * "2.1" < "2.1-SNAPSHOT"
     * "2.1" < "2.1-R1234556"
     * "2.1-R12345" < "2.1-SNAPSHOT"
     * 
     *
     * @param o the other version
     * @return  a negative integer, zero, or a positive integer as this version
     *		is less than, equal to, or greater than the specified version.
     */
    public int compareTo(Version o) {
        String[] oSegs = o.getNormalizedSegments();
        for (int i=0; i< Math.min(segments.length, oSegs.length); i++) {
            String s1 = segments[i];
            String s2 = oSegs[i];
            int strCompare = s1.compareTo(s2);
            if (strCompare == 0) {
                continue;
            }
            try {
                int v1 = Integer.parseInt(segments[i]);
                int v2 = Integer.parseInt(oSegs[i]);
                return v1 - v2;
            } catch (NumberFormatException e) {
                // no numbers, use string compare
                return strCompare;
            }
        }
        return segments.length - oSegs.length;
    }

    /**
     * Same as with {@link #compareTo(Version)}.
     * 
     * @param o the other version
     * @return  a negative integer, zero, or a positive integer as this version is less than, equal to, or greater than the specified version.
     * @deprecated since 3.1.32. use {@link #compareTo(Version)}. See JCRVLT-146
     */
    @Deprecated
    public int osgiCompareTo(Version o) {
        return compareTo(o);
    }
}