/*
 * SonarQube
 * Copyright (C) 2009-2023 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.db.dialect;

import com.google.common.collect.ImmutableSet;
import java.util.Optional;
import java.util.Set;
import java.util.function.Predicate;
import java.util.function.Supplier;
import org.apache.commons.lang.StringUtils;
import org.sonar.api.utils.MessageException;

public final class DialectUtils {

  private static final Set<Supplier<Dialect>> DIALECTS = ImmutableSet.of(H2::new, Oracle::new, PostgreSql::new, MsSql::new);

  private DialectUtils() {
    // only static stuff
  }

  public static Dialect find(String dialectId, String jdbcConnectionUrl) {
    Optional<Dialect> match = StringUtils.isNotBlank(dialectId) ? findById(dialectId) : findByJdbcUrl(jdbcConnectionUrl);
    return match.orElseThrow(() -> MessageException.of(
      "Unable to determine database dialect to use within sonar with dialect " + dialectId + " jdbc url " + jdbcConnectionUrl));
  }

  private static Optional<Dialect> findByJdbcUrl(String jdbcConnectionUrl) {
    return findDialect(dialect -> dialect != null && dialect.matchesJdbcUrl(StringUtils.trimToEmpty(jdbcConnectionUrl)));
  }

  private static Optional<Dialect> findById(String dialectId) {
    return findDialect(dialect -> dialect != null && dialect.getId().equals(dialectId));
  }

  private static Optional<Dialect> findDialect(Predicate<Dialect> predicate) {
    return DIALECTS.stream()
      .map(Supplier::get)
      .filter(predicate)
      .findFirst();
  }
}
