package envoy.server.data;

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

import javax.persistence.*;

import envoy.data.User.UserStatus;

/**
 * This class enables the storage of user specific data inside a database using Hibernate. Its
 * objects will be referred to as database users as opposed to the common user objects present on
 * both the client and the server.
 *
 * @author Kai S. K. Engelbart
 * @author Maximilian Käfer
 * @since Envoy Server Standalone v0.1-alpha
 */
@Entity
@NamedQueries({
				@NamedQuery(name = User.findByName, query = "SELECT u FROM User u WHERE u.name = :name"),
				@NamedQuery(name = User.findContacts, query = "SELECT u.contacts FROM User u WHERE u = :user"),
				@NamedQuery(name = User.searchByName, query = "SELECT u FROM User u WHERE (lower(u.name) LIKE lower(:searchPhrase) AND u <> :context AND :context NOT MEMBER OF u.contacts)")
})
public final class User extends Contact {

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

	/**
	 * Named query retrieving the contacts of a given user (parameter {@code :user}).
	 *
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public static final String findContacts = "User.findContacts";

	/**
	 * Named query searching for users with a name like a search phrase (parameter
	 * {@code :searchPhrase}) that are not in the contact list of a given user (parameter
	 * {@code :context}).
	 *
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public static final String searchByName = "User.searchByName";

	@Column(name = "password_hash")
	private String passwordHash;

	@Column(name = "auth_token")
	private String authToken;

	@Column(name = "auth_token_expiration")
	private Instant authTokenExpiration;

	@Column(name = "last_seen")
	private Instant lastSeen;

	@Column(name = "latest_contact_deletion")
	private Instant latestContactDeletion;

	private UserStatus status;

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

	@Override
	protected envoy.data.User toFlatCommon() {
		return new envoy.data.User(id, name, status, Set.of());
	}

	/**
	 * @return the password hash
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public String getPasswordHash() { return passwordHash; }

	/**
	 * @param passwordHash the password hash to set
	 * @since Envoy Server Standalone v0.1-beta
	 */
	public void setPasswordHash(String passwordHash) { this.passwordHash = passwordHash; }

	/**
	 * @return the authentication token
	 * @since Envoy Server v0.2-beta
	 */
	public String getAuthToken() { return authToken; }

	/**
	 * @param authToken the authentication token to set
	 * @since Envoy Server v0.2-beta
	 */
	public void setAuthToken(String authToken) { this.authToken = authToken; }

	/**
	 * @return the time at which the authentication token expires
	 * @since Envoy Server v0.2-beta
	 */
	public Instant getAuthTokenExpiration() { return authTokenExpiration; }

	/**
	 * @param authTokenExpiration the authentication token expiration timestamp to set
	 * @since Envoy Server v0.2-beta
	 */
	public void setAuthTokenExpiration(Instant authTokenExpiration) {
		this.authTokenExpiration = authTokenExpiration;
	}

	/**
	 * @return the last date the user has been online
	 * @since Envoy Server Standalone v0.2-beta
	 */
	public Instant getLastSeen() { return lastSeen; }

	/**
	 * @param lastSeen the latest date at which the user has been online to set
	 * @since Envoy Server Standalone v0.2-beta
	 */
	public void setLastSeen(Instant lastSeen) { this.lastSeen = lastSeen; }

	/**
	 * @return the status
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public UserStatus getStatus() { return status; }

	/**
	 * @param status the status to set
	 * @since Envoy Server Standalone v0.1-alpha
	 */
	public void setStatus(UserStatus status) { this.status = status; }

	/**
	 * @return the latestContactDeletion
	 * @since Envoy Server v0.3-beta
	 */
	public Instant getLatestContactDeletion() { return latestContactDeletion; }

	/**
	 * @param latestContactDeletion the latestContactDeletion to set
	 * @since Envoy Server v0.3-beta
	 */
	public void setLatestContactDeletion(Instant latestContactDeletion) {
		this.latestContactDeletion = latestContactDeletion;
	}
}