/*******************************************************************************
 * Copyright 2018 A-SIT Plus GmbH
 * AT-specific eIDAS Connector has been developed in a cooperation between EGIZ, 
 * A-SIT Plus GmbH, A-SIT, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "License");
 * You may not use this work except in compliance with the License.
 * You may obtain a copy of the License at:
 * https://joinup.ec.europa.eu/news/understanding-eupl-v12
 *
 * 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.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
package at.asitplus.eidas.specific.modules.authmodule_eIDASv2.service;

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.annotation.PostConstruct;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import at.asitplus.eidas.specific.modules.authmodule_eIDASv2.Constants;
import at.gv.egiz.eaaf.core.api.idp.IConfigurationWithSP;
import at.gv.egiz.eaaf.core.exceptions.EAAFConfigurationException;
import at.gv.egiz.eaaf.core.impl.utils.KeyValueUtils;
import eu.eidas.auth.commons.attribute.AttributeRegistries;
import eu.eidas.auth.commons.attribute.AttributeRegistry;

@Service("attributeRegistry")
public class eIDASAttributeRegistry {
	private static final Logger log = LoggerFactory.getLogger(eIDASAttributeRegistry.class);	
	@Autowired private IConfigurationWithSP basicConfig;
	
	private AttributeRegistry coreAttributeRegistry;
	 
	private String eidasAttributesFile;
	private String additionalAttributesFile;
	
	@PostConstruct
	private void initialize() throws RuntimeException {
		try {
			if (eidasAttributesFile.isEmpty()) {
				log.error("Basic eIDAS addribute definition NOT defined");
				throw new EAAFConfigurationException("config.30", 
						new Object[] {"eidas-attributes.xml"});
			
			}
        
			boolean additionalAttrAvailabe = false;
			if (!additionalAttributesFile.isEmpty()) {
				File file = new File(additionalAttributesFile);
				if (file.exists())
					additionalAttrAvailabe = true;
								
			}
			
			if (!additionalAttrAvailabe) {
				log.info("Start eIDAS ref. impl. Core without additional eIDAS attribute definitions ... ");
				coreAttributeRegistry = AttributeRegistries.fromFiles(eidasAttributesFile, null);
				
			} else {
				//load attribute definitions
				log.info("Start eIDAS ref. impl. Core with additional eIDAS attribute definitions ... ");
				coreAttributeRegistry = AttributeRegistries.fromFiles(eidasAttributesFile, null, additionalAttributesFile);

			}
						
        } catch (Throwable e) {
			log.error("Can NOT initialize eIDAS attribute definition." , e);
			new RuntimeException("Can NOT initialize eIDAS attribute definition.", e);
			
		}        	
	}
	
	
    public AttributeRegistry getCoreAttributeRegistry() {
        return coreAttributeRegistry;
    }

	public Map<String, Boolean> getAttributeSetFromConfiguration() {
		Map<String, Boolean> result = new HashMap<String, Boolean>();
		
		/*TODO: select set for representation if mandates should be used.
		 * It's an open task in respect to requested eIDAS attributes and isRequired flag,
		 * because there can be a decision problem in case of natural or legal person representation!
		 * From an Austrian use-case point of view, an Austrian service provider can support mandates for 
		 * natural and legal persons at the same time. However, we CAN NOT request attributes for natural AND
		 * legal persons on the same time, because it's not possible to represent both simultaneously.
		 */
		Map<String, String> configAttributes = 
				basicConfig.getBasicConfigurationWithPrefix(
						Constants.CONIG_PROPS_EIDAS_NODE_ATTRIBUTES_REQUESTED_ONLYNATURAL);
		for (String el: configAttributes.values()) {
			if (StringUtils.isNotEmpty(el.trim())) {
				List<String> attrDef = KeyValueUtils.getListOfCSVValues(el.trim());
				boolean isRequired = false;
				if (attrDef.size() == 2)
					isRequired = Boolean.parseBoolean(attrDef.get(1));
				
				result.put(attrDef.get(0), isRequired);
				
			}			
		}
		
		log.trace("Load #" + result.size() + " requested attributes from configuration");
		return result;
		
	}


	public void setEidasAttributesFile(String eidasAttributesFile) {
		this.eidasAttributesFile = eidasAttributesFile;
	}

	public void setAdditionalAttributesFile(String additionalAttributesFile) {
		this.additionalAttributesFile = additionalAttributesFile;
	}
	
	
}