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/*
 * 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.job.api;

import static org.opencastproject.util.data.Collections.nullToNil;
import static org.opencastproject.util.data.Monadics.mlist;

import org.opencastproject.job.api.Incident.Severity;
import org.opencastproject.util.data.Function;
import org.opencastproject.util.data.Function2;
import org.opencastproject.util.jaxb.UtcTimestampAdapter;

import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import javax.xml.bind.annotation.XmlValue;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

/** 1:1 serialization of a {@link Incident}. */
@XmlAccessorType(XmlAccessType.NONE)
@XmlType(name = "incident", namespace = "http://job.opencastproject.org")
@XmlRootElement(name = "incident", namespace = "http://job.opencastproject.org")
public final class JaxbIncident {
  @XmlElement(name = "id")
  private long id;

  @XmlElement(name = "jobId")
  private long jobId;

  @XmlElement(name = "serviceType")
  private String serviceType;

  @XmlElement(name = "processingHost")
  private String processingHost;

  @XmlElement(name = "timestamp")
  @XmlJavaTypeAdapter(UtcTimestampAdapter.class)
  private Date timestamp;

  @XmlElement(name = "severity")
  private Severity severity;

  @XmlElement(name = "code")
  private String code;

  @XmlElementWrapper(name = "descriptionParameters")
  @XmlElement(name = "param")
  private List descriptionParameters;

  @XmlElementWrapper(name = "details")
  @XmlElement(name = "detail")
  private List details;

  /** Constructor for JAXB */
  public JaxbIncident() {
  }

  public JaxbIncident(Incident incident) {
    this.id = incident.getId();
    this.jobId = incident.getJobId();
    this.serviceType = incident.getServiceType();
    this.processingHost = incident.getProcessingHost();
    this.timestamp = new Date(incident.getTimestamp().getTime());
    this.severity = incident.getSeverity();
    this.code = incident.getCode();
    this.descriptionParameters = mlist(incident.getDescriptionParameters().entrySet()).map(Param.mkFn).value();
    this.details = mlist(incident.getDetails()).map(JaxbIncidentDetail.mkFn).value();
  }

  public static final Function mkFn = new Function() {
    @Override
    public JaxbIncident apply(Incident incident) {
      return new JaxbIncident(incident);
    }
  };

  public Incident toIncident() {
    return new IncidentImpl(id, jobId, serviceType, processingHost, timestamp, severity, code,
            mlist(nullToNil(details)).map(JaxbIncidentDetail.toDetailFn).value(), mlist(
                    nullToNil(descriptionParameters)).foldl(new HashMap<>(),
                    new Function2, Param, Map>() {
                      @Override
                      public Map apply(Map sum, Param param) {
                        sum.put(param.getName(), param.getValue());
                        return sum;
                      }
                    }));
  }

  public static final Function toIncidentFn = new Function() {
    @Override
    public Incident apply(JaxbIncident dto) {
      return dto.toIncident();
    }
  };

  /**
   * An description parameter. To read about why this class is necessary, see http://java.net/jira/browse/JAXB-223
   */
  @XmlAccessorType(XmlAccessType.FIELD)
  @XmlType(name = "param", namespace = "http://job.opencastproject.org")
  public static final class Param {
    @XmlAttribute(name = "name")
    private String name;

    @XmlValue
    private String value;

    public static Param mk(Entry entry) {
      final Param dto = new Param();
      dto.name = entry.getKey();
      dto.value = entry.getValue();
      return dto;
    }

    public String getName() {
      return name;
    }

    public String getValue() {
      return value;
    }

    public static final Function, Param> mkFn = new Function, Param>() {
      @Override
      public Param apply(Entry entry) {
        return mk(entry);
      }
    };
  }
}