<%#
 Copyright 2013-2017 the original author or authors from the JBooter project.

 This file is part of the JBooter project, see https://jbooter.github.io/
 for more information.

 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 <%=packageName%>.service;

import <%=packageName%>.domain.Authority;
import <%=packageName%>.domain.User;
import <%=packageName%>.repository.AuthorityRepository;
import <%=packageName%>.repository.UserRepository;
<%_ if (searchEngine == 'elasticsearch') { _%>
import <%=packageName%>.repository.search.UserSearchRepository;
<%_ } _%>

import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.social.connect.Connection;
import org.springframework.social.connect.ConnectionRepository;
import org.springframework.social.connect.UserProfile;
import org.springframework.social.connect.UsersConnectionRepository;
import org.springframework.stereotype.Service;

import java.util.HashSet;
import java.util.Locale;
import java.util.Optional;
import java.util.Set;

@Service
public class SocialService {

    private final Logger log = LoggerFactory.getLogger(SocialService.class);

    private final UsersConnectionRepository usersConnectionRepository;

    private final AuthorityRepository authorityRepository;

    private final PasswordEncoder passwordEncoder;

    private final UserRepository userRepository;

    private final MailService mailService;
    <%_ if (searchEngine == 'elasticsearch') { _%>

    private final UserSearchRepository userSearchRepository;
    <%_ } _%>

    public SocialService(UsersConnectionRepository usersConnectionRepository, AuthorityRepository authorityRepository,
            PasswordEncoder passwordEncoder, UserRepository userRepository,
            MailService mailService<% if (searchEngine == 'elasticsearch') { %>, UserSearchRepository userSearchRepository<% } %>) {

        this.usersConnectionRepository = usersConnectionRepository;
        this.authorityRepository = authorityRepository;
        this.passwordEncoder = passwordEncoder;
        this.userRepository = userRepository;
        this.mailService = mailService;
        <%_ if (searchEngine == 'elasticsearch') { _%>
        this.userSearchRepository = userSearchRepository;
        <%_ } _%>
    }

    public void deleteUserSocialConnection(String login) {
        ConnectionRepository connectionRepository = usersConnectionRepository.createConnectionRepository(login);
        connectionRepository.findAllConnections().keySet().stream()
            .forEach(providerId -> {
                connectionRepository.removeConnections(providerId);
                log.debug("Delete user social connection providerId: {}", providerId);
            });
    }

    public void createSocialUser(Connection<?> connection, String langKey) {
        if (connection == null) {
            log.error("Cannot create social user because connection is null");
            throw new IllegalArgumentException("Connection cannot be null");
        }
        UserProfile userProfile = connection.fetchUserProfile();
        String providerId = connection.getKey().getProviderId();
        String imageUrl = connection.getImageUrl();
        User user = createUserIfNotExist(userProfile, langKey, providerId, imageUrl);
        createSocialConnection(user.getLogin(), connection);
        mailService.sendSocialRegistrationValidationEmail(user, providerId);
    }

    private User createUserIfNotExist(UserProfile userProfile, String langKey, String providerId, String imageUrl) {
        String email = userProfile.getEmail();
        String userName = userProfile.getUsername();
        if (!StringUtils.isBlank(userName)) {
            userName = userName.toLowerCase(Locale.ENGLISH);
        }
        if (StringUtils.isBlank(email) && StringUtils.isBlank(userName)) {
            log.error("Cannot create social user because email and login are null");
            throw new IllegalArgumentException("Email and login cannot be null");
        }
        if (StringUtils.isBlank(email) && userRepository.findOneByLogin(userName).isPresent()) {
            log.error("Cannot create social user because email is null and login already exist, login -> {}", userName);
            throw new IllegalArgumentException("Email cannot be null with an existing login");
        }
        if (!StringUtils.isBlank(email)) {
            Optional<User> user = userRepository.findOneByEmail(email);
            if (user.isPresent()) {
                log.info("User already exist associate the connection to this account");
                return user.get();
            }
        }

        String login = getLoginDependingOnProviderId(userProfile, providerId);
        String encryptedPassword = passwordEncoder.encode(RandomStringUtils.random(10));
        Set<Authority> authorities = new HashSet<>(1);
        authorities.add(authorityRepository.findOne("ROLE_USER"));

        User newUser = new User();
        newUser.setLogin(login);
        newUser.setPassword(encryptedPassword);
        newUser.setFirstName(userProfile.getFirstName());
        newUser.setLastName(userProfile.getLastName());
        newUser.setEmail(email);
        newUser.setActivated(true);
        newUser.setAuthorities(authorities);
        newUser.setLangKey(langKey);
        newUser.setImageUrl(imageUrl);

        <%_ if (searchEngine == 'elasticsearch') { _%>
        userSearchRepository.save(newUser);
        <%_ } _%>
        return userRepository.save(newUser);
    }

    /**
     * @return login if provider manage a login like Twitter or Github otherwise email address.
     *         Because provider like Google or Facebook didn't provide login or login like "12099388847393"
     */
    private String getLoginDependingOnProviderId(UserProfile userProfile, String providerId) {
        switch (providerId) {
            case "twitter":
                return userProfile.getUsername().toLowerCase();
            default:
                return userProfile.getEmail();
        }
    }

    private void createSocialConnection(String login, Connection<?> connection) {
        ConnectionRepository connectionRepository = usersConnectionRepository.createConnectionRepository(login);
        connectionRepository.addConnection(connection);
    }
}