/*
    * Copyright 2019 the original author or authors.
    *
    * 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 org.bremersee.dccon.config;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import lombok.extern.slf4j.Slf4j;
  import org.bremersee.data.ldaptive.LdaptiveProperties;
  import org.springframework.beans.factory.ObjectProvider;
  import org.springframework.boot.context.event.ApplicationReadyEvent;
  import org.springframework.context.annotation.Profile;
  import org.springframework.context.event.EventListener;
  import org.springframework.stereotype.Component;
  import org.springframework.util.Assert;
  
  /**
   * The kinit password file configuration.
   *
   * @author Christian Bremer
   */
  @Profile("cli")
  @Component
  @Slf4j
  public class KinitPasswordFileConfiguration {
  
    private final DomainControllerProperties properties;
  
    private final LdaptiveProperties ldaptiveProperties;
  
    /**
     * Instantiates a new kinit password file configuration.
     *
     * @param properties the properties
     * @param ldaptivePropertiesProvider the provider of the ldaptive properties
     */
    public KinitPasswordFileConfiguration(
        DomainControllerProperties properties,
        ObjectProvider<LdaptiveProperties> ldaptivePropertiesProvider) {
      this.properties = properties;
      this.ldaptiveProperties = ldaptivePropertiesProvider.getIfAvailable();
    }
  
    /**
     * Init.
     */
    @EventListener(ApplicationReadyEvent.class)
    public void init() {
      if (ldaptiveProperties == null) {
        log.warn("Kinit password file cannot be created because ldaptive properties are not "
            + "present. You have to enable profile 'ldap'.");
      } else {
        Assert.hasText(properties.getKinitAdministratorName(),
            "Kinit administrator name must be present.");
        Assert.hasText(properties.getKinitPasswordFile(),
            "Kinit password file must be specified.");
        final File file = new File(properties.getKinitPasswordFile());
        if (!file.exists()) {
          try (final FileOutputStream out = new FileOutputStream(file)) {
            out.write(ldaptiveProperties.getBindCredential().getBytes(StandardCharsets.UTF_8));
            out.flush();
          } catch (IOException e) {
            log.error("Creating kinit password file failed.");
          }
        }
        Assert.isTrue(file.exists(), "Kinit password file must exist.");
      }
    }
  
  }