/*
    * Copyright (c) 2001-2017, Zoltan Farkas All Rights Reserved.
    *
    * This library is free software; you can redistribute it and/or
    * modify it under the terms of the GNU Lesser General Public
    * License as published by the Free Software Foundation; either
    * version 2.1 of the License, or (at your option) any later version.
    *
    * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   *
   * Additionally licensed with:
   *
   * 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.spf4j.io.csv;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.NoSuchElementException;
  
  final class CsvReader2Iterator implements Iterator<Iterable<String>> {
  
    private final CsvReader reader;
  
    private final List<String> row;
  
    private boolean haveParsedRow;
  
    CsvReader2Iterator(final CsvReader preader) {
      this.reader = preader;
      haveParsedRow = false;
      row = new ArrayList<>();
    }
  
    private CsvReader.TokenType readRow() throws IOException, CsvParseException {
      row.clear();
      CsvReader.TokenType token;
      boolean loop = true;
      do {
        token = reader.next();
        switch (token) {
          case ELEMENT:
            row.add(reader.getElement().toString());
            break;
          case END_DOCUMENT:
          case END_ROW:
            loop = false;
            break;
          default:
            throw new IllegalStateException("Illegal token " + token);
        }
      } while (loop);
      haveParsedRow = !row.isEmpty();
      return token;
    }
  
    @Override
    public boolean hasNext() {
      if (!haveParsedRow) {
        try {
          CsvReader.TokenType token = readRow();
          if (haveParsedRow) {
            return true;
          } else {
            return token != CsvReader.TokenType.END_DOCUMENT;
          }
        } catch (IOException ex) {
          throw new UncheckedIOException(ex);
        } catch (CsvParseException ex) {
          throw new UncheckedCsvParseException(ex);
        }
      } else {
        return true;
      }
    }
  
    @Override
    public Iterable<String> next() {
      if (!hasNext()) {
       throw new NoSuchElementException();
     } else {
       haveParsedRow = false;
       return row;
     }
   }
 
   @Override
   public String toString() {
     return "CsvReader2Iterator{" + "reader=" + reader + ", row=" + row + ", haveParsedRow=" + haveParsedRow + '}';
   }
 
 }