/*
    * Copyright 2017 Andrew Rucker Jones.
    *
    * 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 com.opencsv.bean.concurrent;
  
  import com.opencsv.bean.BeanVerifier;
  import com.opencsv.bean.CsvToBeanFilter;
  import com.opencsv.bean.MappingStrategy;
  import com.opencsv.bean.exceptionhandler.CsvExceptionHandler;
  import com.opencsv.bean.util.OpencsvUtils;
  import com.opencsv.bean.util.OrderedObject;
  import com.opencsv.exceptions.*;
  import org.apache.commons.lang3.ArrayUtils;
  import org.apache.commons.lang3.ObjectUtils;
  
  import java.util.*;
  import java.util.concurrent.BlockingQueue;
  
  /**
   * A class that encapsulates the job of creating a bean from a line of CSV input
   * and making it possible to run those jobs in parallel.
   * @param <T> The type of the bean being created
   * @author Andrew Rucker Jones
   * @since 4.0
   */
  public class ProcessCsvLine<T> implements Runnable {
      private final long lineNumber;
      private final MappingStrategy<? extends T> mapper;
      private final CsvToBeanFilter filter;
      private final List<BeanVerifier<T>> verifiers;
      private final String[] line;
      private final BlockingQueue<OrderedObject<T>> resultantBeanQueue;
      private final BlockingQueue<OrderedObject<CsvException>> thrownExceptionsQueue;
      private final SortedSet<Long> expectedRecords;
      private final CsvExceptionHandler exceptionHandler;
  
      /**
       * The only constructor for creating a bean out of a line of input.
       * @param lineNumber Which record in the input file is being processed
       * @param mapper The mapping strategy to be used
       * @param filter A filter to remove beans from the running, if necessary.
       *   May be null.
       * @param verifiers The list of verifiers to run on beans after creation
       * @param line The line of input to be transformed into a bean
       * @param resultantBeanQueue A queue in which to place the bean created
       * @param thrownExceptionsQueue A queue in which to place a thrown
       *   exception, if one is thrown
       * @param expectedRecords A list of outstanding record numbers so gaps
       *                        in ordering due to filtered input or exceptions
       *                        while converting can be detected.
       * @param exceptionHandler The handler for exceptions thrown during record
       *                         processing
       */
      public ProcessCsvLine(
              long lineNumber, MappingStrategy<? extends T> mapper, CsvToBeanFilter filter,
              List<BeanVerifier<T>> verifiers, String[] line,
              BlockingQueue<OrderedObject<T>> resultantBeanQueue,
              BlockingQueue<OrderedObject<CsvException>> thrownExceptionsQueue,
              SortedSet<Long> expectedRecords, CsvExceptionHandler exceptionHandler) {
          this.lineNumber = lineNumber;
          this.mapper = mapper;
          this.filter = filter;
          this.verifiers = ObjectUtils.defaultIfNull(new ArrayList<>(verifiers), Collections.emptyList());
          this.line = ArrayUtils.clone(line);
          this.resultantBeanQueue = resultantBeanQueue;
          this.thrownExceptionsQueue = thrownExceptionsQueue;
          this.expectedRecords = expectedRecords;
          this.exceptionHandler = exceptionHandler;
      }
  
      @Override
      public void run() {
          try {
              if (filter == null || filter.allowLine(line)) {
                  T obj = processLine();
                  ListIterator<BeanVerifier<T>> verifierList = verifiers.listIterator();
                  boolean keep = true;
                  while(keep && verifierList.hasNext()) {
                      keep = verifierList.next().verifyBean(obj);
                  }
                  if (keep) {
                      OpencsvUtils.queueRefuseToAcceptDefeat(
                              resultantBeanQueue,
                              new OrderedObject<>(lineNumber, obj));
                  }
                  else {
                      expectedRecords.remove(lineNumber);
                 }
             }
             else {
                 expectedRecords.remove(lineNumber);
             }
         } catch (CsvException e) {
             expectedRecords.remove(lineNumber);
             e.setLine(line);
             OpencsvUtils.handleException(e, lineNumber, exceptionHandler, thrownExceptionsQueue);
         } catch (Exception e) {
             expectedRecords.remove(lineNumber);
             throw new RuntimeException(e);
         }
     }
 
     /**
      * Creates a single object from a line from the CSV file.
      * @return Object containing the values.
      * @throws CsvBeanIntrospectionException Thrown on error creating bean.
      * @throws CsvBadConverterException If a custom converter cannot be
      *   initialized properly
      * @throws CsvFieldAssignmentException A more specific subclass of this
      *   exception is thrown for any problem decoding and assigning a field
      *   of the input to a bean field
      * @throws CsvChainedException If multiple exceptions are thrown for the
      * same input line
      */
     private T processLine()
             throws CsvBeanIntrospectionException,
             CsvBadConverterException, CsvFieldAssignmentException,
             CsvChainedException {
         return mapper.populateNewBean(line);
     }
 }