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/*
    Blue Crystal: Document Digital Signature Tool
    Copyright (C) 2007-2015  Sergio Leal

    This program 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.

    This program 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.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */



package bluecrystal.service.loader;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.security.cert.CRLException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509CRL;
import java.util.Date;
import java.util.HashMap;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LCRLoaderImpl implements LCRLoader {
	static final Logger LOG = LoggerFactory.getLogger(LCRLoaderImpl.class);
	private static CacheManager localCache = null;
	
	private static String cacheType = Messages.getString("LCRLoader.cacheType");
	static {
		try {
			localCache = (CacheManager) Class
			        .forName(cacheType)
			        .newInstance();
//			if(repoLoader==null){
//				LOG.error("Could not load Repoloader ");
//			}
		} catch (Exception e) {
//			LOG.error("Could not load Repoloader ", e);
			e.printStackTrace();
		}
	}
	
	
	
	public LCRLoaderImpl() {
		super();
	}
	


	public X509CRL get(byte[] dists, Date date) throws CertificateException, CRLException, IOException {
		String url = new String(dists);
		return get(url, date);
	}
	
	public X509CRL get(List dists, Date date) throws CertificateException, CRLException, IOException{
		for( String nextDist : dists){
			try {
				LOG.debug("Buscando: "+ nextDist);

				return get(nextDist, date);
			} catch (IOException e) {
				LOG.error("Could not load CRL ", e);
			}
		}
		return null;
		
	}
	private X509CRL get(String dists, Date date) throws CertificateException, CRLException, IOException {
		String url = new String(dists);
		X509CRL ret = getInCache(url, date);;
		if( ret != null){
			LOG.debug(":: LCR encontrada no cache: "+url);
		}else{
			LOG.debug(":: LCR tentando baixar : "+url);
			X509CRL crl = getFresh(url);
			LOG.debug(":: LCR carregada de: "+url);
			if(crl != null){
				addToCache(url, crl);
			}
			ret = crl;
		}

		LOG.debug(":: X509CRL get: "+ret);
		return ret;
		
	}	


	private X509CRL getFresh(String url) throws CertificateException, CRLException, IOException {
		byte [] encoded = getFromServer(url);
		return decode(encoded);
	}
	private X509CRL decode(byte[] encoded) throws CertificateException, IOException, CRLException {
		InputStream inStream = new ByteArrayInputStream(encoded);
		CertificateFactory cf = CertificateFactory.getInstance("X.509"); //$NON-NLS-1$
		 X509CRL crl = (X509CRL)cf.generateCRL(inStream);
		 inStream.close();
		 return crl;
	}
	private byte[] getFromServer(String url) throws MalformedURLException, IOException {
		return ExternalLoaderHttp.getfromUrl(url);
	}
	private X509CRL getInCache(String url, Date date) {
		return localCache.getInCache(url, date);
	}
//	private boolean checkInCache(String url, Date date) {
//		return localCache.checkInCache(url, date);
//	}
	private void addToCache(String key, X509CRL crl) {
		localCache.addToCache(key, crl);
		
	}

}