/*******************************************************************************
 * Copyright 2019 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.connector.config;

import java.net.MalformedURLException;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.i18n.CookieLocaleResolver;
import org.thymeleaf.templateresolver.FileTemplateResolver;

import at.asitplus.eidas.specific.connector.MSeIDASNodeConstants;
import at.gv.egiz.eaaf.core.api.idp.IConfiguration;
import at.gv.egiz.eaaf.core.impl.utils.FileUtils;

/**
 * @author tlenz
 *
 */
@Configuration
@EnableWebMvc
public class StaticResourceConfiguration extends WebMvcConfigurerAdapter {
	private static final Logger log = LoggerFactory.getLogger(StaticResourceConfiguration.class);
	private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {
			"/"
		};
	
	private static final String DEFAULT_MESSAGE_SOURCE = "classpath:properties/status_messages";
	
	@Autowired private IConfiguration basicConfig;
	

	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {
		String staticResources = basicConfig.getBasicConfiguration(MSeIDASNodeConstants.PROP_CONFIG_WEBCONTENT_STATIC_PATH);
		try {
			if (StringUtils.isNotEmpty(staticResources)) {
				String absPath = FileUtils.makeAbsoluteURL(staticResources , basicConfig.getConfigurationRootDirectory());
				if (!absPath.endsWith("/"))
					absPath += "/";
					
				registry.addResourceHandler("/static/**").addResourceLocations(absPath);
				log.info("Add Ressourcefolder: " + absPath + " for static Web content");
				
			} else
				log.debug("No Ressourcefolder for static Web content");
				
		} catch (MalformedURLException e) {
			log.warn("Can NOT initialize ressourcefolder for static Web content", e);
			
		}
		
		registry.addResourceHandler("/**").addResourceLocations(CLASSPATH_RESOURCE_LOCATIONS);
			   
	}
	
	 @Bean
	 public ReloadableResourceBundleMessageSource internalMessageSource(){
		final ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();

	    //add default message source
	    messageSource.setBasename(DEFAULT_MESSAGE_SOURCE);	      	        
	    messageSource.setDefaultEncoding("UTF-8");
	    return messageSource;
	        
	 }
	 
	 @Bean
	 public ReloadableResourceBundleMessageSource messageSource(){
		 final ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
	    messageSource.setDefaultEncoding("UTF-8");
	    messageSource.setParentMessageSource(internalMessageSource());
	    	
	    final String staticResources = basicConfig.getBasicConfiguration(MSeIDASNodeConstants.PROP_CONFIG_WEBCONTENT_PROPERTIES_PATH);
		try {
			if (StringUtils.isNotEmpty(staticResources)) {
				final String absPath = FileUtils.makeAbsoluteURL(staticResources , basicConfig.getConfigurationRootDirectory());
				messageSource.setBasename(absPath);
								
			} else
				log.debug("No Ressourcefolder for dynamic Web content templates");
				
		} catch (final MalformedURLException e) {
			log.warn("Can NOT initialize ressourcefolder for dynamic Web content templates", e);
				
		}
				
		return messageSource;
			
	 }
	 
	 @Bean
	 public CookieLocaleResolver localeResolver(){
		 final CookieLocaleResolver localeResolver = new CookieLocaleResolver();
	     localeResolver.setCookieName("currentLanguage");
	     localeResolver.setCookieMaxAge(3600);
	     return localeResolver;
	 }
		
	 @Bean(name="templateResolver")
	 public FileTemplateResolver templateResolver() {
		final String staticResources = basicConfig.getBasicConfiguration(MSeIDASNodeConstants.PROP_CONFIG_WEBCONTENT_TEMPLATES_PATH);
		try {
			if (StringUtils.isNotEmpty(staticResources)) {
				String absPath = FileUtils.makeAbsoluteURL(staticResources , basicConfig.getConfigurationRootDirectory());
				if (!absPath.endsWith("/"))
					absPath += "/";

				if (absPath.startsWith("file:"))
					absPath = absPath.substring("file:".length());
					
				final FileTemplateResolver viewResolver = new FileTemplateResolver();
				viewResolver.setPrefix(absPath);
				viewResolver.setSuffix(".html");
				viewResolver.setTemplateMode("HTML5");
				viewResolver.setCacheable(false);
									
			    log.info("Add Ressourcefolder: " + absPath + " for dynamic Web content templates");
				return viewResolver ;
													
			} else
				log.debug("No Ressourcefolder for dynamic Web content templates");
					
		} catch (final MalformedURLException e) {
			log.warn("Can NOT initialize ressourcefolder for dynamic Web content templates", e);
				
		}
			
			//TODO: implement some backup solution
		return null;
			
	}
}