package envoy.server.data;

import java.time.Instant;
import java.util.Set;

import javax.persistence.*;

/**
 * This class acts as a superclass for all contacts, being {@link User}s and {@link Group}s.
 *
 * @author Maximilian Käfer
 * @since Envoy Server Standalone v0.1-alpha
 */

@Entity
@Table(name = "contacts", uniqueConstraints = { @UniqueConstraint(columnNames = { "name" }) })
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class Contact {

	@Id
	@GeneratedValue
	protected long		id;
	protected String	name;

	@Column(name = "creation_date")
	private Instant creationDate;

	@ManyToMany(fetch = FetchType.EAGER)
	protected Set<Contact> contacts;

	/**
	 * @return a {@link envoy.data.Contact} object of this envoy.server.data.Contact object.
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public abstract envoy.data.Contact toCommon();

	/**
	 * Transforms this contact into a {@link envoy.data.Contact} where the contacts set of contacts
	 * is empty.
	 *
	 * @return a {@link envoy.data.Contact} object of this contact object.
	 * @since Envoy Server Standalone v0.1-beta
	 */
	protected abstract envoy.data.Contact toFlatCommon();

	/**
	 * @return the ID of this contact.
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public long getID() { return id; }

	/**
	 * Sets the ID of this contact.
	 *
	 * @param id to set for this contact
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public void setID(long id) { this.id = id; }

	/**
	 * @return the name of this contact.
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public String getName() { return name; }

	/**
	 * Sets the name of this contact.
	 *
	 * @param name to set for this contact
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public void setName(String name) { this.name = name; }

	/**
	 * @return the contacts
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public Set<Contact> getContacts() { return contacts; }

	/**
	 * @param contacts the contacts to set
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public void setContacts(Set<Contact> contacts) { this.contacts = contacts; }

	/**
	 * @return the creationDate
	 * @since Envoy Server Standalone v0.2-beta
	 */
	public Instant getCreationDate() { return creationDate; }

	/**
	 * @param creationDate the creationDate to set
	 * @since Envoy Server Standalone v0.2-beta
	 */
	public void setCreationDate(Instant creationDate) { this.creationDate = creationDate; }

	@Override
	public String toString() {
		return String.format("%s[id=%d,name=%s,%d contact(s)]", getClass().getSimpleName(), id,
			name, contacts.size());
	}
}