/*
    * 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 org.apache.syncope.wa.starter.webauthn;
  
  import com.fasterxml.jackson.core.type.TypeReference;
  import com.yubico.data.CredentialRegistration;
  import java.util.Collection;
  import java.util.List;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  import org.apache.syncope.common.lib.SyncopeClientException;
  import org.apache.syncope.common.lib.types.ClientExceptionType;
  import org.apache.syncope.common.lib.wa.WebAuthnAccount;
  import org.apache.syncope.common.lib.wa.WebAuthnDeviceCredential;
  import org.apache.syncope.common.rest.api.service.wa.WebAuthnRegistrationService;
  import org.apache.syncope.wa.bootstrap.WARestClient;
  import org.apereo.cas.configuration.CasConfigurationProperties;
  import org.apereo.cas.util.crypto.CipherExecutor;
  import org.apereo.cas.webauthn.WebAuthnUtils;
  import org.apereo.cas.webauthn.storage.BaseWebAuthnCredentialRepository;
  import org.jooq.lambda.Unchecked;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class WAWebAuthnCredentialRepository extends BaseWebAuthnCredentialRepository {
  
      protected static final Logger LOG = LoggerFactory.getLogger(WAWebAuthnCredentialRepository.class);
  
      protected final WARestClient waRestClient;
  
      public WAWebAuthnCredentialRepository(final CasConfigurationProperties properties,
              final WARestClient waRestClient) {
          super(properties, CipherExecutor.noOpOfStringToString());
          this.waRestClient = waRestClient;
      }
  
      protected WebAuthnRegistrationService service() {
          return waRestClient.getService(WebAuthnRegistrationService.class);
      }
  
      @Override
      public boolean removeRegistrationByUsername(
              final String username,
              final CredentialRegistration credentialRegistration) {
  
          String id = credentialRegistration.getCredential().getCredentialId().getHex();
          service().delete(username, id);
          return true;
      }
  
      @Override
      public boolean removeAllRegistrations(final String username) {
          service().delete(username);
          return true;
      }
  
      @Override
      public Stream<? extends CredentialRegistration> stream() {
          return service().list().
                  stream().
                  map(WebAuthnAccount::getCredentials).
                  flatMap(Collection::stream).
                  map(Unchecked.function(record -> {
                      String json = getCipherExecutor().decode(record.getJson());
                      return WebAuthnUtils.getObjectMapper().readValue(json, new TypeReference<>() {
                      });
                  }));
      }
  
      @Override
      protected void update(final String username, final Collection<CredentialRegistration> records) {
          try {
              List<WebAuthnDeviceCredential> credentials = records.stream().
                      map(Unchecked.function(record -> {
                          String json = getCipherExecutor().encode(WebAuthnUtils.getObjectMapper().
                                  writeValueAsString(record));
                          return new WebAuthnDeviceCredential.Builder().
                                  json(json).
                                  identifier(record.getCredential().getCredentialId().getHex()).
                                  build();
                      })).
                      collect(Collectors.toList());
  
             WebAuthnAccount account = service().read(username);
             if (account != null) {
                 account.getCredentials().addAll(credentials);
                 service().update(username, account);
             } else {
                 account = new WebAuthnAccount.Builder().credentials(credentials).build();
                 service().create(username, account);
             }
         } catch (final Exception e) {
             LOG.error(e.getMessage(), e);
         }
     }
 
     @Override
     public Collection<CredentialRegistration> getRegistrationsByUsername(final String username) {
         try {
             return service().read(username).getCredentials().stream().
                     map(Unchecked.function(record -> {
                         String json = getCipherExecutor().decode(record.getJson());
                         return WebAuthnUtils.getObjectMapper()
                                 .readValue(json, new TypeReference<CredentialRegistration>() {
                                 });
                     })).
                     collect(Collectors.toList());
         } catch (SyncopeClientException e) {
             if (e.getType() == ClientExceptionType.NotFound) {
                 LOG.info("Could not locate account for {}", username);
             } else {
                 LOG.error(e.getMessage(), e);
             }
         } catch (Exception e) {
             LOG.error(e.getMessage(), e);
         }
         return List.of();
     }
 }