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/*-
 * #%L
 * marid-webapp
 * %%
 * Copyright (C) 2012 - 2018 MARID software development group
 * %%
 * This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 * #L%
 */
package org.marid.ui.webide.base.dao;

import org.marid.applib.dao.ListDao;
import org.marid.applib.repository.Artifact;
import org.marid.ui.webide.base.UserDirectories;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.util.Collection;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.marid.applib.json.MaridJackson.MAPPER;

@Component
public class ArtifactDao implements ListDao {

  private final Path file;

  public ArtifactDao(UserDirectories userDirectories) {
    this.file = userDirectories.getArtifactsFile();
  }

  @Override
  public List load() {
    try (final var reader = Files.newBufferedReader(file, UTF_8)) {
      final var parser = MAPPER.getFactory().createParser(reader);
      return MAPPER.readValues(parser, Artifact.class).readAll();
    } catch (NoSuchFileException x) {
      return List.of();
    } catch (IOException x) {
      throw new UncheckedIOException(x);
    }
  }

  @Override
  public Set getIds() {
    return load().stream().collect(Collectors.toUnmodifiableSet());
  }

  @Override
  public void save(Collection data) {
    try (final var writer = Files.newBufferedWriter(file, UTF_8)) {
      MAPPER.writerFor(Artifact.class).writeValues(writer).writeAll(data);
    } catch (IOException x) {
      throw new UncheckedIOException(x);
    }
  }
}