package at.asitplus.eidas.specific.modules.authmodule_eIDASv2.utils;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.joda.time.DateTime;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.ImmutableList;

import at.asitplus.eidas.specific.modules.authmodule_eIDASv2.Constants;
import at.gv.egiz.eaaf.core.impl.data.Trible;
import eu.eidas.auth.commons.attribute.AttributeDefinition;
import eu.eidas.auth.commons.attribute.AttributeValue;
import eu.eidas.auth.commons.attribute.AttributeValueMarshaller;
import eu.eidas.auth.commons.attribute.AttributeValueMarshallingException;
import eu.eidas.auth.commons.protocol.eidas.impl.PostalAddress;

public class eIDASResponseUtils {
	private static final Logger log = LoggerFactory.getLogger(eIDASResponseUtils.class);
	
	public static final String PERSONALIDENIFIER_VALIDATION_PATTERN = "^[A-Z,a-z]{2}/[A-Z,a-z]{2}/.*";
	 
	/**
	 * Validate a eIDAS PersonalIdentifier attribute value 
	 * This validation is done according to eIDAS SAML Attribute Profile -  Section 2.2.3 Unique Identifier 
	 * 
	 * @param uniqueID eIDAS attribute value of a unique identifier
	 * @return true if the uniqueID matches to eIDAS to Unique Identifier specification, otherwise false
	 */
	public static boolean validateEidasPersonalIdentifier(String uniqueID) {
		Pattern pattern = Pattern.compile(PERSONALIDENIFIER_VALIDATION_PATTERN );
		Matcher matcher = pattern.matcher(uniqueID);	
		return matcher.matches();
		
	}
	
	
	/**
	 * Parse an eIDAS PersonalIdentifier attribute value into it components. 
	 * This processing is done according to eIDAS SAML Attribute Profile -  Section 2.2.3 Unique Identifier 
	 * 
	 * @param uniqueID eIDAS attribute value of a unique identifier
	 * @return {@link Trible} that contains: 
	 * 				<br> First : citizen country
	 * 				<br> Second: destination country
	 * 				<br> Third : unique identifier
	 * 	<br> or null if the attribute value has a wrong format
	 */					
	public static Trible<String, String, String> parseEidasPersonalIdentifier(String uniqueID) {
		if (!validateEidasPersonalIdentifier(uniqueID)) {
			log.error("eIDAS attribute value for " + Constants.eIDAS_ATTR_PERSONALIDENTIFIER 
					+ " looks wrong formated. Value:" + ((String)uniqueID));				
			return null;
			
		}		
		return Trible.newInstance(uniqueID.substring(0, 2), uniqueID.substring(3, 5), uniqueID.substring(6)); 
		
	}

    public static List<String> translateStringListAttribute(AttributeDefinition<?> attributeDefinition, ImmutableList<? extends AttributeValue<?>> attributeValues) {
        final List<String> stringListAttribute = new ArrayList<String>();
        AttributeValueMarshaller<?> attributeValueMarshaller = attributeDefinition.getAttributeValueMarshaller();
        for (AttributeValue<?> attributeValue : attributeValues) {
            String valueString = null;
            try {
                valueString = attributeValueMarshaller.marshal((AttributeValue) attributeValue);
                stringListAttribute.add(valueString);
            } catch (AttributeValueMarshallingException e) {
                throw new IllegalStateException(e);
                
            }
        }
        
        return stringListAttribute;
        
    }
    
    public static DateTime translateDateAttribute(AttributeDefinition<?> attributeDefinition, ImmutableList<? extends AttributeValue<?>> attributeValues) {
        if (attributeValues.size() != 0) {
            final AttributeValue<?> firstAttributeValue = attributeValues.get(0);
            return (DateTime) firstAttributeValue.getValue();

        }
        
        return null;
    }
    
    public static PostalAddress translateAddressAttribute(AttributeDefinition<?> attributeDefinition, ImmutableList<? extends AttributeValue<?>> attributeValues) {
        final AttributeValue<?> firstAttributeValue = attributeValues.get(0);
        return (PostalAddress) firstAttributeValue.getValue();

    }
	
}