/*
 * MIT License
 *
 * Copyright (c) 2020-present Cloudogu GmbH and Contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package sonia.scm.store;

import sonia.scm.migration.UpdateException;
import sonia.scm.repository.Repository;
import sonia.scm.repository.RepositoryLocationResolver;
import sonia.scm.update.NamespaceUpdateIterator;

import javax.inject.Inject;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import java.nio.file.Path;
import java.util.Collection;
import java.util.HashSet;
import java.util.function.Consumer;

public class FileNamespaceUpdateIterator implements NamespaceUpdateIterator {

  private final RepositoryLocationResolver locationResolver;
  private final JAXBContext jaxbContext;

  @Inject
  public FileNamespaceUpdateIterator(RepositoryLocationResolver locationResolver) {
    this.locationResolver = locationResolver;
    try {
      jaxbContext = JAXBContext.newInstance(Repository.class);
    } catch (JAXBException ex) {
      throw new IllegalStateException("failed to create jaxb context for repository", ex);
    }
  }

  @Override
  public void forEachNamespace(Consumer<String> namespaceConsumer) {
    Collection<String> namespaces = new HashSet<>();
    locationResolver
      .forClass(Path.class)
      .forAllLocations((repositoryId, path) -> {
        try {
          Repository metadata = (Repository) jaxbContext.createUnmarshaller().unmarshal(path.resolve("metadata.xml").toFile());
          namespaces.add(metadata.getNamespace());
        } catch (JAXBException e) {
          throw new UpdateException("Failed to read metadata for repository " + repositoryId, e);
        }
      });
    namespaces.forEach(namespaceConsumer);
  }
}
