/**
 * Copyright (c) Istituto Nazionale di Fisica Nucleare (INFN). 2006-2016
 *
 * Licensed under the Apache 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://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.glite.security.voms.admin.persistence.model.audit;

import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;

import javax.persistence.CollectionTable;
import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.Table;

import org.glite.security.voms.admin.event.auditing.NullHelper;
import org.hibernate.annotations.Index;

@Entity
@Table(name = "audit_event")
@org.hibernate.annotations.Table(appliesTo = "audit_event",
    indexes = {@Index(columnNames = {"principal", "event_timestamp"}, name = "ae_principal_idx"),
        @Index(columnNames = {"event_timestamp", "event_type"}, name = "ae_type_idx")})
public class AuditEvent {

  @Id
  @Column(name = "event_id")
  @GeneratedValue(strategy=GenerationType.IDENTITY)
  Long id;

  @Column(name = "principal", nullable = false, length = 255)
  String principal;

  @Column(name = "event_timestamp", nullable = false, updatable = false)
  Date timestamp;

  @Column(name = "event_type", nullable = false, length = 255)
  String type;

  @ElementCollection
  @CollectionTable(name = "audit_event_data", joinColumns = @JoinColumn(name = "event_id") )
  Set<AuditEventData> data = new HashSet<AuditEventData>();

  public Long getId() {

    return id;
  }

  public void setId(Long id) {

    this.id = id;
  }

  public String getPrincipal() {

    return principal;
  }

  public void setPrincipal(String principal) {

    this.principal = principal;
  }

  public Date getTimestamp() {

    return timestamp;
  }

  public void setTimestamp(Date timestamp) {

    this.timestamp = timestamp;
  }

  public String getType() {

    return type;
  }

  public void setType(String type) {

    this.type = type;
  }

  public Set<AuditEventData> getData() {

    return data;
  }

  public void setData(Set<AuditEventData> data) {

    this.data = data;
  }

  public <T> AuditEvent addDataPoint(String name, T value) {
    getData().add(new AuditEventData(name, NullHelper.nullSafeValue(value)));
    return this;
  }

  public String getDataPoint(String name) {

    for (AuditEventData dp : getData()) {
      if (dp.getName().equals(name)) {
        return dp.getValue();
      }
    }

    return null;
  }

  public SortedSet<AuditEventData> getSortedData() {
    SortedSet<AuditEventData> sortedData =
        new TreeSet<AuditEventData>(AuditEventDataNameComparator.INSTANCE);

    sortedData.addAll(getData());

    return Collections.unmodifiableSortedSet(sortedData);
  }

  @Override
  public String toString() {

    return "AuditEvent [id=" + id + ", principal=" + principal + ", timestamp=" + timestamp
        + ", type=" + type + ", data=" + data + "]";
  }

  @Override
  public int hashCode() {

    final int prime = 31;
    int result = 1;
    result = prime * result + ((principal == null) ? 0 : principal.hashCode());
    result = prime * result + ((timestamp == null) ? 0 : timestamp.hashCode());
    result = prime * result + ((type == null) ? 0 : type.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {

    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    AuditEvent other = (AuditEvent) obj;
    if (principal == null) {
      if (other.principal != null)
        return false;
    } else if (!principal.equals(other.principal))
      return false;
    if (timestamp == null) {
      if (other.timestamp != null)
        return false;
    } else if (!timestamp.equals(other.timestamp))
      return false;
    if (type == null) {
      if (other.type != null)
        return false;
    } else if (!type.equals(other.type))
      return false;
    return true;
  }

  public String getShortType() {
    return type.substring(type.lastIndexOf(".") + 1);
  }
}