/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.so.db.catalog.utils;


import java.io.Serializable;

/**
 * This class is the base class for object that requires a Version in Catalog DB. The version is built on a string as
 * ASDC provides a number like 1.2 or 2.0 ... This class supports also 1.2.3.4... (Maven like version)
 *
 *
 */
public class MavenLikeVersioning implements Serializable {

    protected String version;

    public String getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    /**
     * This method is used to compare the current object version to a specified one It is assumed that the version is
     * like the maven one, eg: 2.0.1.5.6
     *
     * @param versionToCompare The version that will be used for comparison
     * @return True if the current object is more recent than the specified version, False otherwise
     *
     */
    public boolean isMoreRecentThan(String versionToCompare) {
        if (versionToCompare == null || versionToCompare.trim().isEmpty() || this.version == null
                || this.version.trim().isEmpty()) {
            return false;
        }
        String[] currentVersionArray = this.version.split("\\.");
        String[] specifiedVersionArray = versionToCompare.split("\\.");

        int smalestStringLength = Math.min(currentVersionArray.length, specifiedVersionArray.length);

        for (int currentVersionIndex = 0; currentVersionIndex < smalestStringLength; ++currentVersionIndex) {

            if (Integer.parseInt(currentVersionArray[currentVersionIndex]) < Integer
                    .parseInt(specifiedVersionArray[currentVersionIndex])) {
                return false;
            } else if (Integer.parseInt(currentVersionArray[currentVersionIndex]) > Integer
                    .parseInt(specifiedVersionArray[currentVersionIndex])) {
                return true;
            }
        }
        try {
            // Even if versionToCompare has more digits, it means versionToCompare is more recent
            return Integer.parseInt(currentVersionArray[smalestStringLength - 1]) != Integer
                    .parseInt(specifiedVersionArray[smalestStringLength - 1])
                    || currentVersionArray.length > specifiedVersionArray.length;
        } catch (NumberFormatException e) {
            return false;
        }
    }

    /**
     * This method is used to compare the current object version to a specified one It is assumed that the version is
     * like the maven one, eg: 2.0.1.5.6
     *
     * @param versionToCompare The version that will be used for comparison
     * @return True if the current object is equal to the specified version, False otherwise
     *
     */
    public boolean isTheSameVersion(String versionToCompare) {
        if (versionToCompare == null && this.version == null) {
            return true;
        } else if (versionToCompare == null || "".equals(versionToCompare.trim()) || this.version == null
                || "".equals(this.version.trim())) {
            return false;
        }
        String[] currentVersionArray = this.version.split("\\.");
        String[] specifiedVersionArray = versionToCompare.split("\\.");

        if (currentVersionArray.length != specifiedVersionArray.length) {
            return false;
        }

        for (int currentVersionIndex = 0; currentVersionIndex < currentVersionArray.length; ++currentVersionIndex) {

            if (Integer.parseInt(currentVersionArray[currentVersionIndex]) != Integer
                    .parseInt(specifiedVersionArray[currentVersionIndex])) {
                return false;
            }
        }

        return true;
    }
}