/*
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * 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.gv.egovernment.moa.id.config.webgui.validation.task.impl;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Pattern;

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

import at.gv.egiz.components.configuration.api.Configuration;
import at.gv.egiz.components.configuration.api.ConfigurationException;
import at.gv.egiz.eaaf.core.impl.utils.KeyValueUtils;
import at.gv.egovernment.moa.id.commons.config.MOAIDConfigurationConstants;
import at.gv.egovernment.moa.id.commons.validation.ValidationHelper;
import at.gv.egovernment.moa.id.config.webgui.exception.ConfigurationTaskValidationException;
import at.gv.egovernment.moa.id.config.webgui.exception.ValidationObjectIdentifier;
import at.gv.egovernment.moa.id.config.webgui.helper.LanguageHelper;
import at.gv.egovernment.moa.id.config.webgui.validation.task.AbstractTaskValidator;
import at.gv.egovernment.moa.id.config.webgui.validation.task.IDynamicLoadableTaskValidator;
import at.gv.egovernment.moa.util.MiscUtil;

/**
 * @author tlenz
 *
 */
public class ServicesProtocolSTORKTask extends AbstractTaskValidator implements IDynamicLoadableTaskValidator {
	private static final Logger log = LoggerFactory.getLogger(ServicesProtocolSTORKTask.class);
	private static final List<String> KEYWHITELIST;
		
	static {
		ArrayList<String> temp = new ArrayList<String>();		
		KEYWHITELIST = Collections.unmodifiableList(temp);
	}
	
	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.config.webgui.validation.task.ITaskValidator#getKeyPrefix()
	 */
	@Override
	public String getKeyPrefix() {
		return "";
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.config.webgui.validation.task.ITaskValidator#getName()
	 */
	@Override
	public String getName() {
		return "Service - General Configuration Task";
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.config.webgui.validation.task.ITaskValidator#postProcessing(java.util.Map, java.util.List, at.gv.egiz.components.configuration.api.Configuration)
	 */
	@Override
	public Map<String, String> postProcessing(Map<String, String> input,
			List<String> keysToDelete, Configuration dbconfig) {
		Map<String, String> newConfigValues = new HashMap<String, String>();
		
		try {
			//search actually stored service configurations
			List<String> storedServices = new ArrayList<String>();
			for (String prefix : getModulValidatorPrefix()) {
				String[] storedService = dbconfig.findConfigurationId(prefix + ".%." + MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER);
				if (storedService != null && storedService.length > 0)
					storedServices.addAll(Arrays.asList(storedService));
			}
		
			String GUIServiceUniqueID = input.get(MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER);
			String selectedServiceKey = null;
			for (String serviceKey : storedServices) {
				String storedUniqueId = dbconfig.getStringValue(serviceKey);
				if (storedUniqueId.equals(GUIServiceUniqueID)) {
					selectedServiceKey = KeyValueUtils.getPrefixFromKey(serviceKey, MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER);
					log.debug("Find service with key: " + selectedServiceKey + " --> Start STORK attribute provider postProcessing.");
					break;
				}
				
			}

			//load actually stored attribute provider names for service
			Map<String, String> storedAttributeProviders = new HashMap<String, String>();
			if (MiscUtil.isNotEmpty(selectedServiceKey)) {
				String[] storedAttribteProviderNames = dbconfig.findConfigurationId(
						selectedServiceKey + "." 
						+ MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST
						+ ".%." + MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_NAME);
				if (storedAttribteProviderNames != null) {
					for (String el : storedAttribteProviderNames) {
						String attrProviderName = dbconfig.getStringValue(el);
						storedAttributeProviders.put(attrProviderName, el);
						
					}					
				}				
			}
			
			Map<String, String> storkAttrProviders = KeyValueUtils.getSubSetWithPrefix(input, MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST);
			Iterator<Entry<String, String>> interator = storkAttrProviders.entrySet().iterator();
			while (interator.hasNext()) {
				Entry<String, String> current = interator.next();
				if (current.getKey().endsWith(MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_NAME)) {
					String guiAttrProviderName = current.getValue();
					if (storedAttributeProviders.containsKey(guiAttrProviderName)) {
						log.trace("STORK attribute provider: " + guiAttrProviderName
								+ " is already stored");
						storedAttributeProviders.remove(guiAttrProviderName);
						
					} else {
						log.trace("Add new STORK attribute provider: " + guiAttrProviderName
								+ " to service");
						
					}
				}
			}
			
			if (!storedAttributeProviders.isEmpty()) {
				log.trace("Remove STORK attribute providers from configuration.");
				for (String el : storedAttributeProviders.values()) {
					String removeString = KeyValueUtils.getPrefixFromKey(el, MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_NAME);
					keysToDelete.add(removeString + "*");
					log.debug("Remove STORK attribute provider with key:" + removeString + "*");
					
				}
				
			}
		
		} catch (ConfigurationException e) {
			log.error("Configuration access FAILED.", e);
			
		}
		
		
		if (newConfigValues.isEmpty())
			return null;
		else
			return newConfigValues;
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.config.webgui.validation.task.AbstractTaskValidator#tastValidate(java.util.Map)
	 */
	@Override
	protected void taskValidate(Map<String, String> input)
			throws ConfigurationTaskValidationException {				
		List<ValidationObjectIdentifier> errors = new ArrayList<ValidationObjectIdentifier>();

		//TODO: add in further version
		//STORK MIS attribute provider requires PublicService Target and therefore VIDP config is actually used.
		
//		//check V-IDP specific Target configurations
//		String isBusinessService = input.get(MOAIDConfigurationConstants.SERVICE_BUSINESSSERVICE);
//		if (!Boolean.parseBoolean(isBusinessService)) {
//			log.info("STORK V-IDP only allowed as business Service.");
//			errors.add(new ValidationObjectIdentifier(
//					MOAIDConfigurationConstants.SERVICE_BUSINESSSERVICE, 
//					"BusinessService",
//					"STORK V-IDP only allowed as business Service."));
//		}
		
		String identificationType = input.get(MOAIDConfigurationConstants.SERVICE_AUTH_TARGET_BUSINESS_TYPE);
		//TODO: add in further version
		//STORK MIS attribute provider requires PublicService Target and therefore VIDP config is actually used.
//		if (MiscUtil.isEmpty(identificationType) || 
//				!MOAIDConfigurationConstants.IDENIFICATIONTYPE_STORK.equals(identificationType)) {
		if (MiscUtil.isNotEmpty(identificationType) && 
				!(MOAIDConfigurationConstants.IDENIFICATIONTYPE_STORK.equals(identificationType) 
						|| MOAIDConfigurationConstants.IDENIFICATIONTYPE_EIDAS.equals(identificationType))) {
			log.info("STORK V-IDP only allowes identification numbers with STORK prefix.");
			errors.add(new ValidationObjectIdentifier(
					MOAIDConfigurationConstants.SERVICE_AUTH_TARGET_BUSINESS_TYPE, 
					"BusinessService - IdentificationType",
					"STORK V-IDP only allowes identification numbers with STORK prefix"));
			
		}
		
		
		Map<String, String> storkAttrProviders = KeyValueUtils.getSubSetWithPrefix(input, MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST);		
		Iterator<Entry<String, String>> interator = storkAttrProviders.entrySet().iterator();
		while (interator.hasNext()) {
			Entry<String, String> current = interator.next();
			if (current.getKey().endsWith(MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_NAME)) {
				log.trace("Validate STORK attribute provider with key: " + current.getKey() + " value: " + current.getValue());
				String index = KeyValueUtils.getParentKey(current.getKey());
				
				//validate attribute provider name
				String attrProviderName = current.getValue();
				if (MiscUtil.isEmpty(attrProviderName)) {
					log.info("AttributeProviderPlugin Name is empty.");
					errors.add(new ValidationObjectIdentifier(
							MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST
							+ "." + index + "." + MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_NAME, 
							"STORK - Attribute Provider",
							LanguageHelper.getErrorString("validation.stork.ap.name.empty")));
					
				} else {
					if (!MOAIDConfigurationConstants.ALLOWED_STORKATTRIBUTEPROVIDERS.contains(attrProviderName)) {
						log.info("AttributeProviderPlugin Name is not supported.");
						errors.add(new ValidationObjectIdentifier(
								MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST
								+ "." + index + "." + MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_NAME, 
								"STORK - Attribute Provider",
								LanguageHelper.getErrorString("validation.stork.ap.name.valid")));
					}				
				}
				
				String attrProviderURL = storkAttrProviders.get(index + "." + MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_URL); 
				String attrProviderAttr = storkAttrProviders.get(index + "." + MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_ATTRIBUTES);
				
				if (MiscUtil.isEmpty(attrProviderURL) || !ValidationHelper.validateURL(attrProviderURL)) {
					log.info("AttributeProviderPlugin URL has no valid form.");
					errors.add(new ValidationObjectIdentifier(
							MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST
							+ "." + index + "." + MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_URL, 
							"STORK - Attribute Provider",
							LanguageHelper.getErrorString("validation.stork.ap.url.valid")));
				}

				
				if (MiscUtil.isEmpty(attrProviderAttr) || !attrProviderAttr.matches("[a-zA-Z]+(, ?[a-zA-Z]+)*")) {
					log.info("AttributeProviderPlugin attributes are empty or do not match csv format.");
					errors.add(new ValidationObjectIdentifier(
							MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST
							+ "." + index + "." + MOAIDConfigurationConstants.SERVICE_AUTH_STORK_ATTRIBUTPROVIDER_LIST_ATTRIBUTES, 
							"STORK - Attribute Provider",
							LanguageHelper.getErrorString("validation.stork.ap.attributes.valid")));
				}
					
			}
		}
			
		if (!errors.isEmpty())
			throw new ConfigurationTaskValidationException(errors);
				
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.config.webgui.validation.task.AbstractTaskValidator#getAllAllowedKeys()
	 */
	@Override
	public List<Pattern> getAllAllowedPatterns() {
		return generatePatternsFromKeys(KEYWHITELIST);
	}

	/* (non-Javadoc)
	 * @see at.gv.egovernment.moa.id.config.webgui.validation.task.IDynamicLoadableTaskValidator#getModulValidatorPrefix()
	 */
	@Override
	public List<String> getModulValidatorPrefix() {
		return Arrays.asList(
				MOAIDConfigurationConstants.PREFIX_MOAID_SERVICES_VIDP
				);
	}

}