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/******************************************************************************
 *                                                                            *
 *                    Copyright 2018 Subterranean Security                    *
 *                                                                            *
 *  Licensed under the Apache License, Version 2.0 (the "License");           *
 *  you may not use this file except in compliance with the License.          *
 *  You may obtain a copy of the License at                                   *
 *                                                                            *
 *      http://www.apache.org/licenses/LICENSE-2.0                            *
 *                                                                            *
 *  Unless required by applicable law or agreed to in writing, software       *
 *  distributed under the License is distributed on an "AS IS" BASIS,         *
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
 *  See the License for the specific language governing permissions and       *
 *  limitations under the License.                                            *
 *                                                                            *
 *****************************************************************************/
package com.sandpolis.server.vanilla.auth;

import java.security.KeyPair;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import com.sandpolis.core.util.CryptoUtil;
import com.sandpolis.core.util.CryptoUtil.SAND5.ReciprocalKeyPair;
import com.sandpolis.server.vanilla.store.group.Group;

/**
 * An {@link AuthenticationMechanism} that uses a SAND5 keypair for
 * authentication.
 * 
 * @author cilki
 * @since 5.0.0
 */
@Entity
@Table(name = "KeyMechanisms")
public class KeyMechanism extends AuthenticationMechanism {

	@Id
	@Column
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int db_id;

	/**
	 * The mechanism ID.
	 */
	@Column(nullable = false, unique = true)
	private long id;

	@ManyToOne(optional = false, cascade = CascadeType.ALL)
	@JoinColumn(referencedColumnName = "db_id")
	private Group group;

	@OneToOne(optional = false, cascade = CascadeType.ALL)
	@JoinColumn(referencedColumnName = "db_id")
	private ReciprocalKeyPair client;

	@OneToOne(optional = false, cascade = CascadeType.ALL)
	@JoinColumn(referencedColumnName = "db_id")
	private ReciprocalKeyPair server;

	/**
	 * Create a new {@link KeyMechanism} with the given attributes.
	 * 
	 * @param group  The group associated with the mechanism
	 * @param client The client keypair
	 * @param server The server keypair
	 */
	public KeyMechanism(Group group, ReciprocalKeyPair client, ReciprocalKeyPair server) {
		if (group == null)
			throw new IllegalArgumentException();
		if (client == null)
			throw new IllegalArgumentException();
		if (server == null)
			throw new IllegalArgumentException();

		this.group = group;
		this.client = client;
		this.server = server;
	}

	KeyMechanism() {
	}

	/**
	 * Get the client-side keypair.
	 * 
	 * @return The client's keypair
	 */
	public ReciprocalKeyPair getClient() {
		return client;
	}

	/**
	 * Get the server-side keypair.
	 * 
	 * @return The server's keypair
	 */
	public ReciprocalKeyPair getServer() {
		return server;
	}

	/**
	 * Generate a new {@link KeyMechanism} for the given {@link Group}.
	 * 
	 * @param group The {@link Group} to receive the new mechanism
	 * @return A new {@link KeyMechanism}
	 */
	public static KeyMechanism generate(Group group) {
		if (group == null)
			throw new IllegalArgumentException();

		KeyPair k1 = CryptoUtil.SAND5.generate();
		KeyPair k2 = CryptoUtil.SAND5.generate();

		return new KeyMechanism(group, new ReciprocalKeyPair(k1.getPrivate().getEncoded(), k2.getPublic().getEncoded()),
				new ReciprocalKeyPair(k2.getPrivate().getEncoded(), k1.getPublic().getEncoded()));
	}

}