/*
 * This is eMonocot, a global online biodiversity information resource.
 *
 * Copyright © 2011–2015 The Board of Trustees of the Royal Botanic Gardens, Kew and The University of Oxford
 *
 * eMonocot is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * eMonocot 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 Affero General Public License for more details.
 *
 * The complete text of the GNU Affero General Public License is in the source repository as the file
 * ‘COPYING’.  It is also available from <http://www.gnu.org/licenses/>.
 */
package org.emonocot.portal.remoting;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.emonocot.persistence.dao.JobInstanceDao;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.batch.core.JobInstance;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Repository;
import org.springframework.web.client.RestTemplate;

/**
 *
 * @author ben
 *
 */
@Repository
public class JobInstanceDaoImpl implements JobInstanceDao {

	/**
	 * Logger.
	 */
	private static Logger logger = LoggerFactory.getLogger(JobInstanceDaoImpl.class);

	protected static HttpHeaders httpHeaders = new HttpHeaders();

	static {
		List<MediaType> acceptableMediaTypes = new ArrayList<MediaType>();
		acceptableMediaTypes.add(MediaType.APPLICATION_JSON);
		httpHeaders.setAccept(acceptableMediaTypes);
		httpHeaders.setContentType(MediaType.APPLICATION_JSON);
	}

	/**
	 *
	 */
	 private String baseUri;

	 /**
	  *
	  */
	 private String resourceDir = "jobInstance";

	 /**
	  *
	  */
	 private RestTemplate restTemplate;

	 /**
	  *
	  */
	 @Autowired
	 public void setRestTemplate(RestTemplate restTemplate) {
		 this.restTemplate = restTemplate;
	 }

	 /**
	  *
	  * @param newBaseUri
	  *            Set the base uri
	  */
	 public final void setBaseUri(final String newBaseUri) {
		 this.baseUri = newBaseUri;
	 }

	 /**
	  * @param identifier the identifier of the job instance to load
	  * @return a job instance
	  */
	 public final JobInstance load(final Long identifier) {
		 return restTemplate.getForObject(baseUri + "/"  + resourceDir + "/"
				 + identifier, JobInstance.class);
	 }

	 /**
	  * @param id the id of the job instance to delete
	  */
	 public final void delete(final Long id) {
		 restTemplate.delete(baseUri + "/" + resourceDir + "/" + id);
	 }

	 /**
	  * @param jobInstance the job execution to save
	  */
	 public final void save(final JobInstance jobInstance) {
		 logger.debug("POST: " + baseUri + "/"+ resourceDir);
		 restTemplate.postForObject(baseUri+ "/" + resourceDir, jobInstance,
				 JobInstance.class);
	 }

	 @Override
	 public List<JobInstance> list(Integer page, Integer size) {
		 HttpEntity<JobInstance> requestEntity = new HttpEntity<JobInstance>(httpHeaders);
		 Map<String,Object> uriVariables = new HashMap<String,Object>();
		 uriVariables.put("resource", resourceDir);
		 if(size == null) {
			 uriVariables.put("limit", "");
		 } else {
			 uriVariables.put("limit", size);
		 }

		 if(page == null) {
			 uriVariables.put("start", "");
		 } else {
			 uriVariables.put("start", page);
		 }


		 ParameterizedTypeReference<List<JobInstance>> typeRef = new ParameterizedTypeReference<List<JobInstance>>() {};
		 HttpEntity<List<JobInstance>> responseEntity = restTemplate.exchange(baseUri + "/{resource}?limit={limit}&start={start}", HttpMethod.GET,
				 requestEntity, typeRef,uriVariables);
		 return responseEntity.getBody();
	 }

}