/*
 * 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
 *
 *   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.epam.dlab.backendapi.service;

import com.epam.dlab.auth.UserInfo;
import com.epam.dlab.backendapi.dao.UserRoleDao;
import com.epam.dlab.backendapi.resources.dto.UserRoleDto;
import com.epam.dlab.backendapi.roles.UserRoles;
import com.epam.dlab.exceptions.DlabException;
import com.epam.dlab.exceptions.ResourceNotFoundException;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

@Singleton
public class UserRoleServiceImpl implements UserRoleService {
	private static final String ROLE_NOT_FOUND_MSG = "Any of role : %s were not found";
	private static final String ADMIN = "admin";

	@Inject
	private UserRoleDao userRoleDao;

	@Override
	public List<UserRoleDto> getUserRoles(UserInfo user) {
		List<UserRoleDto> all = userRoleDao.findAll();
		if (UserRoles.isAdmin(user)) {
			return all;
		} else if (UserRoles.isProjectAdmin(user)) {
			return all
					.stream()
					.filter(role -> !role.getId().equalsIgnoreCase(ADMIN))
					.collect(Collectors.toList());
		} else {
			throw new DlabException(String.format("User %s doesn't have appropriate permission", user));
		}
	}

	@Override
	public void createRole(UserRoleDto dto) {
		userRoleDao.insert(dto);
	}

	@Override
	public void updateRole(UserRoleDto dto) {
		checkAnyRoleFound(Collections.singleton(dto.getId()), userRoleDao.update(dto));
	}

	@Override
	public void removeRole(String roleId) {
		userRoleDao.remove(roleId);
	}

	private void checkAnyRoleFound(Set<String> roleIds, boolean anyRoleFound) {
		if (!anyRoleFound) {
			throw new ResourceNotFoundException(String.format(ROLE_NOT_FOUND_MSG, roleIds));
		}
	}
}