/*
    * Copyright 2010 James Pether Sörling
    *
    * 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.
   *
   *	$Id$
   *  $HeadURL$
  */
  package com.hack23.cia.service.external.worldbank.impl;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.beans.factory.annotation.Qualifier;
  import org.springframework.oxm.Unmarshaller;
  import org.springframework.stereotype.Component;
  
  import com.hack23.cia.model.external.worldbank.indicators.impl.IndicatorElement;
  import com.hack23.cia.model.external.worldbank.indicators.impl.IndicatorsElement;
  import com.hack23.cia.service.external.worldbank.api.DataFailureException;
  import com.hack23.cia.service.external.worldbank.api.WorldBankIndicatorApi;
  
  /**
   * The Class WorldbankIndicatorApiImpl.
   */
  @Component
  final class WorldbankIndicatorApiImpl extends AbstractWorldBankApiImpl implements WorldBankIndicatorApi {
  
  	/** The Constant LOGGER. */
  	private static final Logger LOGGER = LoggerFactory.getLogger(WorldbankIndicatorApiImpl.class);
  
  	/** The Constant INDICATORS. */
  	private static final String INDICATORS = "http://api.worldbank.org/indicators?per_page=5000";
  
  	private static final String PAGE_NUMBER = "&page=";
  
  	/** The Constant PROBLEM_GETTING_WORLDBANK_INDICATOR_LIST. */
  	private static final String PROBLEM_GETTING_WORLDBANK_INDICATOR_LIST = "Problem getting worldbank indicator list";
  
  	private static final int SECOND_PAGE = 2;
  
  	/**
  	 * The Constant
  	 * XMLNS_WB_HTTP_INDICATORS_WORLDBANK_EXTERNAL_MODEL_CIA_HACK23_COM_IMPL.
  	 */
  	private static final String XMLNS_WB_HTTP_INDICATORS_WORLDBANK_EXTERNAL_MODEL_CIA_HACK23_COM_IMPL = "xmlns:wb=\"http://indicators.worldbank.external.model.cia.hack23.com/impl\"";
  
  
  	/** The indicators unmarshaller. */
  	@Autowired
  	@Qualifier("worldbankOrgIndicatorsMarshaller")
  	private Unmarshaller indicatorsUnmarshaller;
  
  	/**
  	 * Instantiates a new worldbank indicator api impl.
  	 */
  	public WorldbankIndicatorApiImpl() {
  		super();
  	}
  
  	/* (non-Javadoc)
  	 * @see com.hack23.cia.service.external.worldbank.api.WorldBankIndicatorApi#getIndicators()
  	 */
  	@Override
  	public List<IndicatorElement> getIndicators() throws DataFailureException {
  		final List<IndicatorElement> result = new ArrayList<>();
  
  		try {
  			final IndicatorsElement firstPage = (IndicatorsElement) getXmlAgent().unmarshallXml(indicatorsUnmarshaller,
  					INDICATORS, null, XMLNS_WB_HTTP_WWW_WORLDBANK_ORG,
  					XMLNS_WB_HTTP_INDICATORS_WORLDBANK_EXTERNAL_MODEL_CIA_HACK23_COM_IMPL);
  			result.addAll(firstPage.getIndicator());
  
  			for (int pageNumber = SECOND_PAGE; pageNumber < firstPage.getPages().intValue(); pageNumber++) {
  				final IndicatorsElement otherPageResult = (IndicatorsElement) getXmlAgent().unmarshallXml(indicatorsUnmarshaller,
  						INDICATORS + PAGE_NUMBER + pageNumber, null, XMLNS_WB_HTTP_WWW_WORLDBANK_ORG,
  						XMLNS_WB_HTTP_INDICATORS_WORLDBANK_EXTERNAL_MODEL_CIA_HACK23_COM_IMPL);
  				result.addAll(otherPageResult.getIndicator());
  			}
  
  		} catch (final Exception e) {
  			LOGGER.warn(PROBLEM_GETTING_WORLDBANK_INDICATOR_LIST);
  			throw new DataFailureException(e);
  		}
  
  		return result;
 	}
 
 }