package envoy.server.data;

import java.util.Date;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import envoy.data.MessageBuilder;

/**
 * This class serves as a way to let Hibernate communicate with the server
 * without bringing the dependency of JPA/Hibernate into the client.<br>
 * It will be referenced as "database message" to clarify between the different
 * message objects.<br>
 * <br>
 * Project: <strong>envoy-server-standalone</strong><br>
 * File: <strong>Message.java</strong><br>
 * Created: <strong>02.01.2020</strong><br>
 *
 * @author Kai S. K. Engelbart
 * @since Envoy Server Standalone v0.1-alpha
 */
@Entity
@Table(name = "messages")
@NamedQueries(
	{ @NamedQuery(
		query = "SELECT m FROM Message m WHERE m.recipient =:recipient AND m.status = envoy.data.Message$MessageStatus.SENT",
		name = "getUnreadMessages"
	) }
)
public class Message {

	@Id
	private long id;

	@ManyToOne(cascade = CascadeType.PERSIST)
	private User sender;

	@ManyToOne(cascade = CascadeType.PERSIST)
	private User recipient;

	@Temporal(TemporalType.TIMESTAMP)
	private Date creationDate;

	@Temporal(TemporalType.TIMESTAMP)
	private Date receivedDate;

	@Temporal(TemporalType.TIMESTAMP)
	private Date readDate;

	private String								text;
	private envoy.data.Message.MessageStatus	status;
	private byte[]								attachment;
	private boolean								forwarded;

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

	/**
	 * Constructs a database message from a common message.
	 *
	 * @param message the {@link envoy.data.Message} to convert into a database
	 *                {@link Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public Message(envoy.data.Message message) {
		PersistenceManager persMan = PersistenceManager.getInstance();
		id				= message.getId();
		status			= message.getStatus();
		text			= message.getText();
		creationDate	= message.getCreationDate();
		receivedDate	= message.getReceivedDate();
		readDate		= message.getReadDate();
		sender			= persMan.getUserById(message.getSenderId());
		recipient		= persMan.getUserById(message.getRecipientId());
		forwarded		= message.isForwarded();
		// TODO: attachment = message.getAttachment().toByteArray();DOES NOT WORK YET
	}

	/**
	 * Converts this message into an instance of {@link envoy.data.Message}.
	 *
	 * @return a {@link envoy.data.Message} containing the same values as this
	 *         message
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public envoy.data.Message toCommonMessage() {
		// TODO: Attachment
		envoy.data.Message message = new MessageBuilder(sender.getID(), recipient.getID(), id).setText(text)
			.setDate(creationDate)
			.setStatus(status)
			.setForwarded(forwarded)
			.build();
		message.setReceivedDate(receivedDate);
		message.setReadDate(readDate);
		return message;
	}

	/**
	 * @return the id of a {link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public long getID() { return id; }

	/**
	 * @param id the id to set
	 * @since Envoy Server Standalone v0.1-alpha
	 * @see Message#getID()
	 */
	public void setId(long id) { this.id = id; }

	/**
	 * @return the sender of a {link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public User getSender() { return sender; }

	/**
	 * @param sender the sender to set
	 * @since Envoy Server Standalone v0.1-alpha
	 * @see Message#getSender()
	 */
	public void setSender(User sender) { this.sender = sender; }

	/**
	 * @return the recipient of a {link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public User getRecipient() { return recipient; }

	/**
	 * @param recipient the recipient to set
	 * @since Envoy Server Standalone v0.1-alpha
	 * @see Message#getRecipient()
	 */
	public void setRecipient(User recipient) { this.recipient = recipient; }

	/**
	 * @return the date at which a {link envoy.data.Message} has been created
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public Date getCreationDate() { return creationDate; }

	/**
	 * @param creationDate the creation date to set
	 * @since Envoy Server Standalone v0.1-alpha
	 * @see Message#getCreationDate()
	 */
	public void setCreationDate(Date creationDate) { this.creationDate = creationDate; }

	/**
	 * @return the date at which a {link envoy.data.Message} has been received by
	 *         the server
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public Date getReceivedDate() { return receivedDate; }

	/**
	 * @param receivedDate the received date to set
	 * @since Envoy Server Standalone v0.1-alpha
	 * @see Message#getReceivedDate()
	 */
	public void setReceivedDate(Date receivedDate) { this.receivedDate = receivedDate; }

	/**
	 * @return the date at which a {link envoy.data.Message} has been read
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public Date getReadDate() { return readDate; }

	/**
	 * @param readDate the read date to set
	 * @since Envoy Server Standalone v0.1-alpha
	 * @see Message#getReadDate()
	 */
	public void setReadDate(Date readDate) { this.readDate = readDate; }

	/**
	 * @return the status of a {link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public envoy.data.Message.MessageStatus getStatus() { return status; }

	/**
	 * @param status the new status of a {link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public void setStatus(envoy.data.Message.MessageStatus status) { this.status = status; }

	/**
	 * @return the text content of a {link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public String getText() { return text; }

	/**
	 * @param text the new text content of a {@link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public void setText(String text) { this.text = text; }

	/**
	 * @return the attachment of a {@link envoy.data.Message}
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public byte[] getAttachment() { return attachment; }

	/**
	 * @param attachment the new attachment
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public void setAttachment(byte[] attachment) { this.attachment = attachment; }

	/**
	 * @return whether this message is a forwarded message
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public boolean isForwarded() { return forwarded; }

	/**
	 * @param forwarded this message should be a forwarded message.
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public void setForwarded(boolean forwarded) { this.forwarded = forwarded; }
}