/*******************************************************************************
 *******************************************************************************/
package at.gv.egiz.eidas.specific.connector.config;

import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import at.gv.egiz.eaaf.core.api.idp.ISPConfiguration;
import at.gv.egiz.eaaf.core.exceptions.EAAFConfigurationException;
import at.gv.egiz.eaaf.core.exceptions.EAAFException;
import at.gv.egiz.eaaf.core.impl.idp.conf.AbstractConfigurationImpl;
import at.gv.egiz.eaaf.core.impl.utils.KeyValueUtils;
import at.gv.egiz.eidas.specific.connector.MSeIDASNodeConstants;

@Service("BasicMSSpecificNodeConfig")
public class BasicConfigurationProvider extends AbstractConfigurationImpl{
	private static final Logger log = LoggerFactory.getLogger(BasicConfigurationProvider.class);
	
	private Map<String, ISPConfiguration> spConfigCache = new HashMap<String, ISPConfiguration>(); 
	
	public BasicConfigurationProvider(String configPath) throws EAAFConfigurationException {
		super(configPath);
		
	}

	@Override
	public ISPConfiguration getServiceProviderConfiguration(String entityId) throws EAAFConfigurationException {
		if (!spConfigCache.containsKey(entityId)) {
			log.debug("SP: " + entityId + " is NOT cached. Starting load operation ...  ");
			Map<String, String> allSPs = getBasicMOAIDConfigurationWithPrefix(MSeIDASNodeConstants.PROP_CONFIG_SP_LIST_PREFIX);	
			for (String key : allSPs.keySet()) {
				if (key.endsWith(MSeIDASNodeConstants.PROP_CONFIG_SP_UNIQUEIDENTIFIER) && 
						allSPs.get(key).equals(entityId)) {
					String listId = KeyValueUtils.getParentKey(key);					
					log.trace("Find SP configuration with list-Id: " + listId + ". Extracting configuration elements ... ");
					Map<String, String> spConfig = KeyValueUtils.getSubSetWithPrefix(allSPs, listId + KeyValueUtils.KEY_DELIMITER);
					spConfigCache.put(entityId, 
							new ServiceProviderConfiguration(spConfig, this));
					break;
				}				
			}
			
			if (spConfigCache.containsKey(entityId)) 
				log.info("SP: " + entityId + " is loaded. Continuing auth. process ... ");			
			else {
				log.warn("SP: " + entityId + " is NOT found in configuration. Stopping auth. process ... ");
				return null;
				
			}
			
		} else 
			log.trace("SP: " + entityId + " is already cached. Use configuration from there ... ");

		
		return spConfigCache.get(entityId);
	}

	@Override
	public <T> T getServiceProviderConfiguration(String entityId, Class<T> decorator) throws EAAFConfigurationException {
		ISPConfiguration spConfig = getServiceProviderConfiguration(entityId);
		if (spConfig != null && decorator != null) {
			if (decorator.isInstance(spConfig))
				return (T)spConfig;
			else
				log.error("SPConfig: " + spConfig.getClass().getName() + " is NOT instance of: " + decorator.getName());
								
		}
		
		return null;
		
	}

	@Override
	public String validateIDPURL(URL url) throws EAAFException {
		log.trace("Validate requested URL: " + url);
		String urlPrefixFromConfig = getBasicConfiguration(MSeIDASNodeConstants.PROP_CONFIG_APPLICATION_PUBLIC_URL_PREFIX);
		if (StringUtils.isEmpty(urlPrefixFromConfig)) {
			log.warn("Application config containts NO URL prefix");
			throw new EAAFConfigurationException("config.27", 
					new Object[] {"Application config containts NO " 
							+ getApplicationSpecificKeyPrefix() + MSeIDASNodeConstants.PROP_CONFIG_APPLICATION_PUBLIC_URL_PREFIX });
			
		}
		
		//remove last slash
		if (urlPrefixFromConfig.endsWith("/"))
			urlPrefixFromConfig = urlPrefixFromConfig.substring(0, urlPrefixFromConfig.length()-1);
		
		if (getBasicMOAIDConfigurationBoolean(
				MSeIDASNodeConstants.PROP_CONFIG_APPLICATION_PUBLIC_URL_REQUEST_VALIDATION, false)) {
			if (url != null && url.toExternalForm().startsWith(urlPrefixFromConfig))
				return urlPrefixFromConfig;
				
			log.info("URL: " + url + " does NOT match to allowed application prefix: " + urlPrefixFromConfig);
			return null;
			
		} else {
			return urlPrefixFromConfig;
			
		}
	}

	@Override
	public String getApplicationSpecificKeyPrefix() {	
		return MSeIDASNodeConstants.PROP_CONFIG_APPLICATION_PREFIX;	
		
	}

	@Override
	protected String getBackupConfigPath() {
		return null;
		
	}
	

}