package envoy.server.data;

import java.time.Instant;
import java.util.*;

import javax.persistence.*;

import envoy.data.Group;

/**
 * @author Maximilian Käfer
 * @since Envoy Server Standalone v0.1-beta
 */
@Entity
@NamedQuery(name = GroupMessage.getPendingGroupMsg, query = "SELECT m FROM GroupMessage m JOIN m.memberMessageStatus s WHERE KEY(s) = :userId AND (m.creationDate > :lastSeen "
	+ "OR m.status = envoy.data.Message$MessageStatus.RECEIVED AND m.receivedDate > :lastSeen "
	+ "OR m.status = envoy.data.Message$MessageStatus.READ AND m.readDate > :lastSeen "
	+ "OR m.lastStatusChangeDate > :lastSeen)")
public final class GroupMessage extends Message {

	/**
	 * Named query retrieving pending group messages sent to a group containing a specific user
	 * (parameter {@code userId}) that were sent after a certain time stamp (parameter
	 * {@code :lastSeen}).
	 *
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public static final String getPendingGroupMsg = "GroupMessage.getPendingGroupMsg";

	@ElementCollection
	private Map<Long, envoy.data.Message.MessageStatus> memberMessageStatus;

	@Column(name = "last_status_change_date")
	protected Instant lastStatusChangeDate;

	/**
	 * The constructor for a database object.
	 *
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public GroupMessage() {}

	/**
	 * Constructs a database groupMessage from a common groupMessage.
	 *
	 * @param groupMessage         the {@link envoy.data.GroupMessage} to convert into a database
	 *                             {@link GroupMessage}
	 * @param lastStatusChangeDate the time stamp to set
	 * @since Envoy Server Standalone v0.2-beta
	 */
	public GroupMessage(envoy.data.GroupMessage groupMessage, Instant lastStatusChangeDate) {
		super(groupMessage);
		memberMessageStatus			= groupMessage.getMemberStatuses();
		this.lastStatusChangeDate	= lastStatusChangeDate;
	}

	/**
	 * Converts this groupMessage into an instance of {@link envoy.data.GroupMessage}.
	 *
	 * @return a {@link envoy.data.GroupMessage} containing the same values as this groupMessage
	 * @since Envoy Server Standalone v0.1-beta
	 */
	@Override
	public envoy.data.GroupMessage toCommon() {
		return prepareBuilder().buildGroupMessage((Group) recipient.toCommon(),
			new HashMap<>(memberMessageStatus));
	}

	/**
	 * @return the memberMessageStatus
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public Map<Long, envoy.data.Message.MessageStatus> getMemberMessageStatus() {
		return memberMessageStatus;
	}

	/**
	 * @param memberMessageStatus the memberMessageStatus to set
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public void setMemberMessageStatus(
		Map<Long, envoy.data.Message.MessageStatus> memberMessageStatus) {
		this.memberMessageStatus = memberMessageStatus;
	}

	/**
	 * @return the date at which one of the member statuses changed last
	 * @since Envoy Server Standalone v0.2-beta
	 */
	public Instant getLastStatusChangeDate() { return lastStatusChangeDate; }

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