package envoy.server.data;

import java.util.stream.Collectors;

import javax.persistence.*;

/**
 * Represents a group inside the database. Referred to as "server group" as opposed to "group" from
 * Envoy Common.
 *
 * @author Maximilian Käfer
 * @since Envoy Server Standalone v0.1-alpha
 */
@Entity
@NamedQueries({
				@NamedQuery(name = Group.findByName, query = "SELECT g FROM Group g WHERE g.name = :name"),
				@NamedQuery(name = Group.findPendingGroups, query = "SELECT g FROM Group g WHERE g.creationDate > :lastSeen AND :user MEMBER OF g.contacts")
})
public final class Group extends Contact {

	/**
	 * Named query retrieving a group by name (parameter {@code :name}).
	 *
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public static final String findByName = "Group.findByName";

	/**
	 * Named query retrieving all pending groups for a specific user (parameter {@code :user},
	 * {@code :lastSeen}).
	 *
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public static final String findPendingGroups = "Group.findPendingGroups";

	@Override
	public envoy.data.Group toCommon() {
		return new envoy.data.Group(id, name, contacts.parallelStream().map(User.class::cast)
			.map(User::toFlatCommon).collect(Collectors.toSet()));
	}

	@Override
	protected envoy.data.Group toFlatCommon() {
		return toCommon();
	}
}