/*
 * 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.ignite.internal;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import org.apache.ignite.lang.IgniteProductVersion;

/**
 * Ignite version utils.
 */
public class IgniteVersionUtils {
    /** Ignite version in String form. */
    public static final String VER_STR;

    /** Ignite version. */
    public static final IgniteProductVersion VER;

    /** UTC build date formatter. */
    private static final SimpleDateFormat BUILD_TSTAMP_DATE_FORMATTER;

    /** Formatted build date. */
    public static final String BUILD_TSTAMP_STR;

    /** Build timestamp in seconds. */
    public static final long BUILD_TSTAMP;

    /** Build timestamp string property value. */
    private static final String BUILD_TSTAMP_FROM_PROPERTY;

    /** Revision hash. */
    public static final String REV_HASH_STR;

    /** Release date. */
    public static final String RELEASE_DATE_STR;

    /** Compound version. */
    public static final String ACK_VER_STR;

    /** Copyright blurb. */
    public static final String COPYRIGHT;

    /**
     * Static initializer.
     */
    static {
        VER_STR = IgniteProperties.get("ignite.version")
            .replace(".a", "-a") // Backward compatibility fix.
            .replace(".b", "-b")
            .replace(".final", "-final");

        BUILD_TSTAMP_FROM_PROPERTY = IgniteProperties.get("ignite.build");

        //Development ignite.properties file contains ignite.build = 0, so we will add the check for it.
        BUILD_TSTAMP = !BUILD_TSTAMP_FROM_PROPERTY.isEmpty() && Long.parseLong(BUILD_TSTAMP_FROM_PROPERTY) != 0
            ? Long.parseLong(BUILD_TSTAMP_FROM_PROPERTY) : System.currentTimeMillis() / 1000;

        BUILD_TSTAMP_DATE_FORMATTER = new SimpleDateFormat("yyyyMMdd");

        BUILD_TSTAMP_DATE_FORMATTER.setTimeZone(TimeZone.getTimeZone("UTC"));

        BUILD_TSTAMP_STR = formatBuildTimeStamp(BUILD_TSTAMP * 1000);

        COPYRIGHT = BUILD_TSTAMP_STR.substring(0, 4) + " Copyright(C) Apache Software Foundation";

        REV_HASH_STR = IgniteProperties.get("ignite.revision");

        RELEASE_DATE_STR = IgniteProperties.get("ignite.rel.date");

        String rev = REV_HASH_STR.length() > 8 ? REV_HASH_STR.substring(0, 8) : REV_HASH_STR;

        ACK_VER_STR = VER_STR + '#' + BUILD_TSTAMP_STR + "-sha1:" + rev;

        VER = IgniteProductVersion.fromString(VER_STR + '-' + BUILD_TSTAMP + '-' + REV_HASH_STR);
    }

    /**
     * Builds string date representation in "yyyyMMdd" format.
     * "synchronized" because it uses {@link SimpleDateFormat} which is not threadsafe.
     *
     * @param ts Timestamp.
     * @return Timestamp date in UTC timezone.
     */
    public static synchronized String formatBuildTimeStamp(long ts) {
        return BUILD_TSTAMP_DATE_FORMATTER.format(new Date(ts));
    }

    /**
     * Private constructor.
     */
    private IgniteVersionUtils() {
        // No-op.
    }
}