/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    https://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.testacl

import grails.gorm.DetachedCriteria
import groovy.transform.ToString
import org.codehaus.groovy.util.HashCodeHelper
import org.hibernate.ObjectNotFoundException

@ToString(cache=true, includeNames=true, includePackage=false)
class UserRole implements Serializable {

	private static final long serialVersionUID = 1

	User user
	Role role

	UserRole(User u, Role r) {
		user = u
		role = r
	}

	@Override
	boolean equals(other) {
		if (!(other instanceof UserRole)) {
			return false
		}

		other.user?.id == user?.id && other.role?.id == role?.id
	}

	@Override
	int hashCode() {
		int hashCode = HashCodeHelper.initHash()
		if (user) {
			hashCode = HashCodeHelper.updateHash(hashCode, user.id)
		}
		if (role) {
			hashCode = HashCodeHelper.updateHash(hashCode, role.id)
		}
		hashCode
	}

	static UserRole get(long userId, long roleId) {
		criteriaFor(userId, roleId).get()
	}

	static boolean exists(long userId, long roleId) {
		criteriaFor(userId, roleId).count()
	}

	private static DetachedCriteria criteriaFor(long userId, long roleId) {
		UserRole.where {
			user == User.load(userId) &&
			role == Role.load(roleId)
		}
	}

	static UserRole create(User user, Role role, boolean flush = false) {
		def instance = new UserRole(user: user, role: role)
		instance.save(flush: flush, insert: true)
		instance
	}

	static boolean remove(User u, Role r, boolean flush = false) {
		if (u == null || r == null) return false

		int rowCount = UserRole.where { user == u && role == r }.deleteAll()

		if (flush) { UserRole.withSession { it.flush() } }

		rowCount
	}

	static void removeAll(User u, boolean flush = false) {
		if (u == null) return

		UserRole.where { user == u }.deleteAll()

		if (flush) { UserRole.withSession { it.flush() } }
	}

	static void removeAll(Role r, boolean flush = false) {
		if (r == null) return

		UserRole.where { role == r }.deleteAll()

		if (flush) { UserRole.withSession { it.flush() } }
	}

	static constraints = {
		role validator: { Role r, UserRole ur ->
			if (ur.user == null || ur.user.id == null) return
			boolean existing = false
			UserRole.withNewSession {
				try {
					existing = UserRole.exists(ur.user.id, r.id)
				} catch (ObjectNotFoundException ignored) {
					// no-op
				}
			}
			if (existing) {
				return 'userRole.exists'
			}
		}
	}

	static mapping = {
		id composite: ['user', 'role']
		version false
	}
}
