/*
 * 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.Collections;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import at.gv.egiz.components.configuration.api.Configuration;
import at.gv.egiz.components.configuration.api.ConfigurationException;
import at.gv.egovernment.moa.id.commons.config.MOAIDConfigurationConstants;
import at.gv.egovernment.moa.id.commons.config.persistence.MOAIDConfiguration;
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.ITaskValidator;
import at.gv.egovernment.moa.util.MiscUtil;

/**
 * @author tlenz
 *
 */
public class ServicesGeneralInformationTask extends AbstractTaskValidator implements ITaskValidator {
	private static final Logger log = LoggerFactory.getLogger(ServicesGeneralInformationTask.class);
	private static final List<String> KEYWHITELIST;
	
	private static MOAIDConfiguration dbconfig;	
	
	static {
		ArrayList<String> temp = new ArrayList<String>();		
		KEYWHITELIST = Collections.unmodifiableList(temp);
	}
	

	@Autowired
	public void setDatabaseConfiguration(MOAIDConfiguration config) {
		dbconfig = config;
		
	}
	
	/* (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) {
		return null;
	}

	/* (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 {		
		if (dbconfig == null) {
			throw new ConfigurationTaskValidationException(
					new ValidationObjectIdentifier("internal", "Internal Error", "Configuration is not readable!"));
			
		}
		
		List<ValidationObjectIdentifier> errors = new ArrayList<ValidationObjectIdentifier>();
				
		String check = input.get(MOAIDConfigurationConstants.SERVICE_FRIENDLYNAME);
		if (MiscUtil.isNotEmpty(check)) {
			if (ValidationHelper.containsNotValidCharacter(check, false)) {
				log.warn("OAFriendlyName contains potentail XSS characters: " + check);
				errors.add(new ValidationObjectIdentifier(
						MOAIDConfigurationConstants.SERVICE_FRIENDLYNAME, 
						"FriendlyName",
						LanguageHelper.getErrorString("validation.general.oafriendlyname.valid", 
						new Object[] {ValidationHelper.getNotValidCharacter(false)})));
			}
		} else {
			log.info("OA friendlyName is empty");
			errors.add(new ValidationObjectIdentifier(
					MOAIDConfigurationConstants.SERVICE_FRIENDLYNAME, 
					"FriendlyName",
					LanguageHelper.getErrorString("validation.general.oafriendlyname.empty")));
		}
		
		String isBusinessService = input.get(MOAIDConfigurationConstants.SERVICE_BUSINESSSERVICE);
		if (MiscUtil.isEmpty(isBusinessService)) {
			log.info("OA businessservice flag is empty");
			errors.add(new ValidationObjectIdentifier(
					MOAIDConfigurationConstants.SERVICE_BUSINESSSERVICE, 
					"BusinessService",
					LanguageHelper.getErrorString("validation.general.businessservice.empty")));
			
		}
		
		String servicePrefixId = input.get(MOAIDConfigurationConstants.PREFIX_MOAID_SERVICES);
		if (MiscUtil.isNotEmpty(servicePrefixId)) {
	        String uniqueServiceID = input.get(MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER);
	        if (MiscUtil.isEmpty(uniqueServiceID)) {
	        	log.info("Empty unique service identifier");
	        	errors.add(new ValidationObjectIdentifier(
						MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER, 
						"Unique Identifier",
						LanguageHelper.getErrorString("validation.general.oaidentifier.empty")));	        	
	        	
	        } else {	
	            if (!ValidationHelper.validateURL(uniqueServiceID)) {
	            	log.warn("Unique serice identifier is not a valid URL: " + uniqueServiceID);
	            	errors.add(new ValidationObjectIdentifier(
							MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER, 
							"Unique Identifier",
							LanguageHelper.getErrorString("validation.general.oaidentifier.valid")));
	            		                
	            } else {
	            	//check uniqueness of service identifier
	            	try {
		            	String[] allServiceKeys = dbconfig.findConfigurationId(
		            			MOAIDConfigurationConstants.PREFIX_MOAID_SERVICES
		            			+".%."
		            			+ MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER);
		            	if (allServiceKeys != null) {
			            	List<String> foundKeys = new ArrayList<String>();
			            	for (String elKey : allServiceKeys) {
			            		String elValue = dbconfig.getStringValue(elKey);
			            		if (uniqueServiceID.startsWith(elValue) || 
			            				(elValue != null && elValue.startsWith(uniqueServiceID))) {
			            			log.debug("Found service with key: " + elKey
			            					+ " and uniqueID: " + elValue
			            					+ " which maches to edited service with uniqueID:"
			            					+ uniqueServiceID);
			            			foundKeys.add(elKey);
			            			
			            		}
			            		
			            	}
			            	if ((foundKeys.size() > 1) || 
			            			((foundKeys.size() == 1) && !foundKeys.get(0).startsWith(servicePrefixId) )) {
			            		log.info("The service identifier is not unique");
			            		errors.add(new ValidationObjectIdentifier(
										MOAIDConfigurationConstants.SERVICE_UNIQUEIDENTIFIER, 
										"Unique Identifier",
										LanguageHelper.getErrorString("validation.general.oaidentifier.notunique")));
			            		
			            	}
		            	}
		            	
	            	} catch (ConfigurationException e) {
	            		log.error("Configuration not readable!", e);
	            		new ValidationObjectIdentifier("internal", "Internal Error", "Configuration is not readable!");
	            		
	            	}
	            }
	        }			
			
		} else {
			throw new ConfigurationTaskValidationException(
					new ValidationObjectIdentifier("internal", "Internal Error", "No MOA-ID service prefix! Can not check uniqueness of service configuration."));
			
		}
		
		
		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);
	}

}