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Utilities for JPA, JDBC and DataSources
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/*
 * Copyright 2021 OmniFaces
 *
 * 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
 *
 *     https://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.omnifaces.persistence;

import static java.util.Arrays.stream;
import static java.util.logging.Level.WARNING;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Stream.concat;
import static org.omnifaces.persistence.JPA.getCurrentBaseEntityService;
import static org.omnifaces.utils.Lang.startsWithOneOf;

import java.util.logging.Logger;
import java.util.stream.Stream;

import jakarta.persistence.EntityManager;

/**
 * Enumeration of all supported databases.
 */
public enum Database {

    H2,

    MYSQL("MARIA"),

    POSTGRESQL("POSTGRES"),

    UNKNOWN;

    private static final Logger logger = Logger.getLogger(Database.class.getName());

    private String[] names;

    Database(String... aliases) {
        this.names = concat(Stream.of(name()), stream(aliases)).collect(toList()).toArray(new String[0]);
    }

    public static Database of(EntityManager entityManager) {
        var provider = Provider.of(entityManager);
        var entityManagerFactory = entityManager.getEntityManagerFactory();

        try {
            var uppercasedDialectName = provider.getDialectName(entityManagerFactory).toUpperCase();

            for (Database database : values()) {
                if (startsWithOneOf(uppercasedDialectName, database.names)) {
                    return database;
                }
            }
        }
        catch (Exception e) {
            logger.log(WARNING, "Cannot to determine configured Database for " + provider + " by " + entityManagerFactory, e);
        }

        return UNKNOWN;
    }

    public static boolean is(Database database) {
        return getCurrentBaseEntityService().getDatabase() == database;
    }

}