/*
    * This file is part of dependency-check-core.
    *
    * 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.
   *
   * Copyright (c) 2023 Jeremy Long. All Rights Reserved.
   */
  package org.owasp.dependencycheck.data.update.nvd.api;
  
  import io.github.jeremylong.openvulnerability.client.nvd.DefCveItem;
  
  import java.io.BufferedInputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Files;
  import java.util.concurrent.Callable;
  import java.util.zip.GZIPInputStream;
  
  import org.owasp.dependencycheck.data.nvd.ecosystem.CveEcosystemMapper;
  import org.owasp.dependencycheck.data.nvdcve.CveDB;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Stores a collection of NVD CVE Data from the NVD API into the database.
   *
   * @author Jeremy Long
   */
  public class NvdApiProcessor implements Callable<NvdApiProcessor> {
  
      /**
       * The Logger for use throughout the class.
       */
      private static final Logger LOGGER = LoggerFactory.getLogger(NvdApiProcessor.class);
      /**
       * A reference to the database.
       */
      private final CveDB cveDB;
      /**
       * The file containing the data to inject.
       */
      private File jsonFile;
      /**
       * Reference to the CVE Ecosystem Mapper object.
       */
      private final CveEcosystemMapper mapper = new CveEcosystemMapper();
      /**
       * The start time.
       */
      private final long startTime;
      /**
       * The end time.
       */
      private long endTime = 0;
  
      /**
       * Create a new processor to put the NVD data into the database.
       *
       * @param cveDB a reference to the database.
       * @param jsonFile the JSON data file to inject.
       * @param startTime the start time of the update process.
       */
      public NvdApiProcessor(final CveDB cveDB, File jsonFile, long startTime) {
          this.cveDB = cveDB;
          this.jsonFile = jsonFile;
          this.startTime = startTime;
      }
  
      /**
       * Create a new processor to put the NVD data into the database.
       *
       * @param cveDB a reference to the database
       * @param jsonFile the JSON data file to inject.
       */
      public NvdApiProcessor(final CveDB cveDB, File jsonFile) {
          this(cveDB, jsonFile, System.currentTimeMillis());
      }
  
      @Override
      public NvdApiProcessor call() throws Exception {
          if (jsonFile.getName().endsWith(".jsonarray.gz")) {
              try (InputStream fis = Files.newInputStream(jsonFile.toPath());
                   InputStream is = new BufferedInputStream(new GZIPInputStream(fis));
                   CveItemSource<DefCveItem> itemSource = new JsonArrayCveItemSource(is)) {
                  updateCveDb(itemSource);
              }
          } else if (jsonFile.getName().endsWith(".gz")) {
              try (InputStream fis = Files.newInputStream(jsonFile.toPath());
                  InputStream is = new BufferedInputStream(new GZIPInputStream(fis));
                  CveItemSource<DefCveItem> itemSource = new CveApiJson20CveItemSource(is)) {
                 updateCveDb(itemSource);
             }
         } else {
             try (InputStream fis = Files.newInputStream(jsonFile.toPath());
                  InputStream is = new BufferedInputStream(fis);
                  CveItemSource<DefCveItem> itemSource = new JsonArrayCveItemSource(is)) {
                 updateCveDb(itemSource);
             }
         }
         endTime = System.currentTimeMillis();
         return this;
     }
 
     private void updateCveDb(CveItemSource<DefCveItem> itemSource) throws IOException {
         while (itemSource.hasNext()) {
             DefCveItem entry = itemSource.next();
             try {
                 cveDB.updateVulnerability(entry, mapper.getEcosystem(entry));
             } catch (Exception ex) {
                 LOGGER.error("Failed to process " + entry.getCve().getId(), ex);
             }
         }
     }
 
     /**
      * Calculates how long the update process took.
      *
      * @return the number of milliseconds that the update process took
      */
     public long getDurationMillis() {
         return endTime - startTime;
     }
 }