/*
    * Licensed to The Apereo Foundation under one or more contributor license
    * agreements. See the NOTICE file distributed with this work for additional
    * information regarding copyright ownership.
    *
    *
    * The Apereo Foundation licenses this file to you under the Educational
    * Community 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://opensource.org/licenses/ecl2.txt
   *
   * 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.opencastproject.assetmanager.impl.query;
  
  import static com.entwinemedia.fn.Equality.eq;
  import static com.entwinemedia.fn.Equality.hash;
  
  import org.opencastproject.assetmanager.api.Property;
  import org.opencastproject.assetmanager.api.Snapshot;
  import org.opencastproject.assetmanager.api.query.ARecord;
  import org.opencastproject.assetmanager.impl.persistence.SnapshotDto;
  
  import com.entwinemedia.fn.Fn;
  import com.entwinemedia.fn.data.Opt;
  
  import java.util.List;
  import java.util.Optional;
  
  public final class ARecordImpl implements ARecord {
    private final long snapshotId;
    private final String mediaPackageId;
    private final List<Property> properties;
    private Optional<Snapshot> snapshot;
    private Opt<SnapshotDto> snapshotDto;
  
    public ARecordImpl(
            long snapshotId,
            String mediaPackageId,
            List<Property> properties) {
      this.snapshotId = snapshotId;
      this.mediaPackageId = mediaPackageId;
      this.properties = properties;
      this.snapshot = Optional.empty();
      this.snapshotDto = Opt.none(SnapshotDto.class);
    }
  
    public ARecordImpl(
            long snapshotId,
            String mediaPackageId,
            List<Property> properties,
            Snapshot snapshot) {
      this(snapshotId, mediaPackageId, properties);
      if (snapshot != null) {
        this.snapshot = Optional.of(snapshot);
      }
    }
  
    public ARecordImpl(
            long snapshotId,
            String mediaPackageId,
        List<Property> properties,
            SnapshotDto snapshotDto) {
      this(snapshotId, mediaPackageId, properties);
      if (snapshotDto != null) {
        this.snapshotDto = Opt.some(snapshotDto);
      }
    }
  
  
    /** Get the database ID of the snapshot. */
    public long getSnapshotId() {
      return snapshotId;
    }
  
    @Override public String getMediaPackageId() {
      return mediaPackageId;
    }
  
    @Override public List<Property> getProperties() {
      return properties;
    }
  
    /**
     * Get the snapshot if set.
     * Otherwise try to convert snapshotDto to {@link Snapshot} with method call {@link SnapshotDto#toSnapshot()},
     * cache and return the result.
     *
     * @return the snapshot
     */
    @Override public Optional<Snapshot> getSnapshot() {
      if (snapshot.isEmpty() && snapshotDto.isSome()) {
       snapshot = Optional.of(snapshotDto.get().toSnapshot());
     }
     return snapshot;
   }
 
   /** Get the snapshotDto. */
   public Opt<SnapshotDto> getSnapshotDto() {
     return snapshotDto;
   }
 
   @Override public int hashCode() {
     return hash(snapshotId);
   }
 
   /** Two records are considered equal if their database IDs are equal. */
   @Override public boolean equals(Object that) {
     return (this == that) || (that instanceof ARecordImpl && eqFields((ARecordImpl) that));
   }
 
   private boolean eqFields(ARecordImpl that) {
     return eq(snapshotId, that.snapshotId);
   }
 
   public static final Fn<ARecordImpl, String> getMediaPackageId = new Fn<ARecordImpl, String>() {
     @Override public String apply(ARecordImpl a) {
       return a.getMediaPackageId();
     }
   };
 }