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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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 io.gravitee.am.gateway.service.impl;

import io.gravitee.am.gateway.service.UserService;
import io.gravitee.am.gateway.service.exception.TechnicalManagementException;
import io.gravitee.am.gateway.service.exception.UserNotFoundException;
import io.gravitee.am.gateway.service.model.NewUser;
import io.gravitee.am.gateway.service.model.UpdateUser;
import io.gravitee.am.model.User;
import io.gravitee.am.model.common.Page;
import io.gravitee.am.repository.exceptions.TechnicalException;
import io.gravitee.am.repository.management.api.UserRepository;
import io.gravitee.common.utils.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Component;

import java.util.Date;
import java.util.Optional;
import java.util.Set;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author Titouan COMPIEGNE (titouan.compiegne at graviteesource.com)
 * @author GraviteeSource Team
 */
@Component
public class UserServiceImpl implements UserService {

    /**
     * Logger.
     */
    private final Logger LOGGER = LoggerFactory.getLogger(UserServiceImpl.class);

    @Autowired
    private UserRepository userRepository;

    private PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();


    @Override
    public Set findByDomain(String domain) {
        try {
            LOGGER.debug("Find users by domain: {}", domain);
            return userRepository.findByDomain(domain);
        } catch (TechnicalException ex) {
            LOGGER.error("An error occurs while trying to find users by domain", ex);
            throw new TechnicalManagementException("An error occurs while trying to find users by domain", ex);
        }
    }

    @Override
    public Page findByDomain(String domain, int page, int size) {
        try {
            LOGGER.debug("Find users by domain: {}", domain);
            return userRepository.findByDomain(domain, page, size);
        } catch (TechnicalException ex) {
            LOGGER.error("An error occurs while trying to find users by domain", ex);
            throw new TechnicalManagementException("An error occurs while trying to find users by domain", ex);
        }
    }

    @Override
    public User findById(String id) {
        try {
            LOGGER.debug("Find user by id : {}", id);
            Optional userOpt = userRepository.findById(id);

            if (!userOpt.isPresent()) {
                throw new UserNotFoundException(id);
            }

            return userOpt.get();
        } catch (TechnicalException ex) {
            LOGGER.error("An error occurs while trying to find a user using its ID", id, ex);
            throw new TechnicalManagementException(
                    String.format("An error occurs while trying to find a user using its ID: %s", id), ex);
        }
    }


    @Override
    public User loadUserByUsernameAndDomain(String domain, String username) {
        try {
            LOGGER.debug("Find user by username and domain: {} {}", username, domain);
            Optional userOpt = userRepository.findByUsernameAndDomain(username, domain);

            if (!userOpt.isPresent()) {
                throw new UserNotFoundException(domain, username);
            }

            return userOpt.get();
        } catch (TechnicalException ex) {
            LOGGER.error("An error occurs while trying to find a user using its ID: {} for the domain {}", username, domain, ex);
            throw new TechnicalManagementException(
                    String.format("An error occurs while trying to find a user using its ID: %s for the domain %s", username, domain), ex);
        }
    }

    @Override
    public User create(String domain, NewUser newUser) {
        try {
            LOGGER.debug("Create a new user {} for domain {}", newUser, domain);

            String userId = UUID.toString(UUID.random());

            User user = new User();
            user.setId(userId);
            user.setDomain(domain);
            user.setUsername(newUser.getUsername());

            if (newUser.getPassword() != null) {
                user.setPassword(passwordEncoder.encode(newUser.getPassword()));
            }

            user.setFirstName(newUser.getFirstName());
            user.setLastName(newUser.getLastName());
            user.setEmail(newUser.getEmail());
            user.setSource(newUser.getSource());
            user.setClient(newUser.getClient());
            user.setLoggedAt(newUser.getLoggedAt());
            user.setLoginsCount(newUser.getLoginsCount());
            user.setAdditionalInformation(newUser.getAdditionalInformation());
            user.setCreatedAt(new Date());
            user.setUpdatedAt(user.getCreatedAt());
            return userRepository.create(user);
        } catch (TechnicalException ex) {
            LOGGER.error("An error occurs while trying to create a user", ex);
            throw new TechnicalManagementException("An error occurs while trying to create a user", ex);
        }
    }

    @Override
    public User update(String domain, String id, UpdateUser updateUser) {
        try {
            LOGGER.debug("Update a user {} for domain {}", id, domain);

            Optional userOpt = userRepository.findById(id);
            if (!userOpt.isPresent()) {
                throw new UserNotFoundException(id);
            }

            User oldUser = userOpt.get();

            if (updateUser.getPassword() != null) {
                oldUser.setPassword(passwordEncoder.encode(updateUser.getPassword()));
            }

            oldUser.setFirstName(updateUser.getFirstName());
            oldUser.setLastName(updateUser.getLastName());
            oldUser.setEmail(updateUser.getEmail());
            oldUser.setSource(updateUser.getSource());
            oldUser.setClient(updateUser.getClient());
            oldUser.setLoggedAt(updateUser.getLoggedAt());
            oldUser.setLoginsCount(updateUser.getLoginsCount());
            oldUser.setUpdatedAt(new Date());
            oldUser.setAdditionalInformation(updateUser.getAdditionalInformation());

            User user = userRepository.update(oldUser);

            return user;
        } catch (TechnicalException ex) {
            LOGGER.error("An error occurs while trying to update a user", ex);
            throw new TechnicalManagementException("An error occurs while trying to update a user", ex);
        }
    }

    @Override
    public void delete(String userId) {
        try {
            LOGGER.debug("Delete user {}", userId);

            Optional optUser = userRepository.findById(userId);
            if (! optUser.isPresent()) {
                throw new UserNotFoundException(userId);
            }

            userRepository.delete(userId);
        } catch (TechnicalException ex) {
            LOGGER.error("An error occurs while trying to delete user: {}", userId, ex);
            throw new TechnicalManagementException(
                    String.format("An error occurs while trying to delete user: %s", userId), ex);
        }
    }


}