/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 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.aai.setup;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.onap.aai.validation.AAISchemaValidationException;

public class SchemaVersion implements Comparable<SchemaVersion> {

    public static final Pattern VERSION_PATTERN = Pattern.compile("v([1-9][0-9]*)");

    private final Integer value;

    public SchemaVersion(String value) {
        Matcher matcher = VERSION_PATTERN.matcher(value);

        if (!matcher.find()) {
            throw new AAISchemaValidationException(
                    "Invalid Schema Version " + value + ", value doesn't match the expected regex: " + VERSION_PATTERN);
        } else {
            this.value = Integer.parseInt(matcher.group(1));
        }
    }

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

    @Override
    public boolean equals(Object other) {

        if (this == other) {
            return true;
        }

        if (other == null) {
            return false;
        }

        if (!(other instanceof SchemaVersion)) {
            return false;
        }

        SchemaVersion obj = (SchemaVersion) other;
        return this.value.equals(obj.value);
    }

    @Override
    public String toString() {
        return String.valueOf("v" + value);
    }

    @Override
    public int compareTo(SchemaVersion o) {

        if (o == null) {
            return -1;
        }

        return this.value.compareTo(o.value);
    }
}