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/**

* Copyright (C) 2014 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.remote.config;

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

import javax.servlet.ServletContext;

import org.apache.log4j.Logger;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.DependsOn;

import org.springframework.context.annotation.Import;

import org.springframework.http.MediaType;

import org.springframework.web.accept.ContentNegotiationManager;

import org.springframework.web.context.support.ServletContextResource;

import org.springframework.web.servlet.ViewResolver;

import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;

import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;

import org.springframework.web.servlet.config.annotation.InterceptorRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import org.springframework.web.servlet.view.ContentNegotiatingViewResolver;

import org.springframework.web.servlet.view.XmlViewResolver;

import eu.etaxonomy.cdm.remote.controller.interceptor.LocaleContextHandlerInterceptor;

import eu.etaxonomy.cdm.remote.view.PatternViewResolver;

/**

 * This is the main configuration for spring MVC application context.

 *

 *

 * <h3>NOTE:</h3>

 *  For a detailed overview on the spring MVC and application context configuration and

 *  bootstrapping of this web application see:

 *  {@link http://dev.e-taxonomy.eu/trac/wiki/cdmlib-remote-webappConfigurationAndBootstrapping}

 *

 *

 * @author a.kohlbecker

 \* @since Jul 1, 2014

 *

 */

// @EnableWebMvc // do not add this since we are overriding WebMvcConfigurationSupport directly

@Import(value={PreloadedBeans.class}) // can not be replaced by @DependsOn("...") ?

//@DependsOn("objectMapperConfigurer")

public abstract class CdmSpringMVCConfig extends WebMvcConfigurationSupport  {

    /**

     * turn caching off FOR DEBUGING ONLY !!!!

     */

    private static final boolean XML_VIEW_CACHING = true;

    public static final Logger logger = Logger.getLogger(CdmSpringMVCConfig.class);

    @Autowired

    protected ServletContext servletContext;

    @Autowired // is initialized in PreloadedBeans.class

    private LocaleContextHandlerInterceptor localeContextHandlerInterceptor;

    Collection<Class<? extends Object>> allCdmTypes = null;

//    ========================== JSP =================================

//    public static final String[] WEB_JAR_RESOURCE_PATTERNS = {"css/", "images/", "lib/", "swagger-ui.js"};

//    public static final String WEB_JAR_RESOURCE_LOCATION = "classpath:META-INF/resources/";

//

//    public static final String WEB_JAR_VIEW_RESOLVER_PREFIX = "/WEB-INF/jsp/";

//    public static final String WEB_JAR_VIEW_RESOLVER_SUFFIX = ".jsp";

//    @Override

//    public void addResourceHandlers(ResourceHandlerRegistry registry) {

//      registry.addResourceHandler(WEB_JAR_RESOURCE_PATTERNS)

//              .addResourceLocations("/")

//              .addResourceLocations(WEB_JAR_RESOURCE_LOCATION).setCachePeriod(0);

//    }

//  @Bean

//  public InternalResourceViewResolver getInternalResourceViewResolverJsp() {

//    InternalResourceViewResolver resolver = new InternalResourceViewResolver();

//    resolver.setOrder(0);

//    resolver.setPrefix(WEB_JAR_VIEW_RESOLVER_PREFIX);

//    resolver.setSuffix(WEB_JAR_VIEW_RESOLVER_SUFFIX);

//    // view names (or name patterns) that can be handled

//    resolver.setViewNames(new String[]{...});

//    return resolver;

//  }

//  ======================================================================

    public CdmSpringMVCConfig() {

        super();

        logger.debug("contructor");

    }

    @Bean

    @DependsOn({"requestMappingHandlerAdapter"})

    public XmlViewResolver getOaiXmlViewResolver() {

        XmlViewResolver resolver = new XmlViewResolver();

      resolver.setOrder(1);

      resolver.setLocation(new ServletContextResource(servletContext,"/WEB-INF/oai-views.xml"));

      resolver.setCache(XML_VIEW_CACHING);

      return resolver;

    }

    /* (non-Javadoc)

     * @see org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration#addInterceptors(org.springframework.web.servlet.config.annotation.InterceptorRegistry)

     */

    @Override

    protected void addInterceptors(InterceptorRegistry registry) {

        // TODO does it work?

        registry.addInterceptor(localeContextHandlerInterceptor);

        logger.debug("addInterceptors");

    }

    @Override

    protected void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {

      // DefaultServletHandlerConfigurer: delegates unhandled requests by forwarding to

      // the Servlet container's "default" servlet, since the DispatcherServlet is mapped to "/"

      // so static content ad welcome files are handled by the default servlet

      configurer.enable();

      logger.debug("configureDefaultServletHandling");

    }

    @Override

    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {

        configurer

        .favorPathExtension(true)

        .favorParameter(false)

        .defaultContentType(MediaType.APPLICATION_JSON)

        .mediaType("xml", MediaType.APPLICATION_XML)

        .mediaType("dc", MediaType.APPLICATION_XML)

        .mediaType("rdf", MediaType.APPLICATION_XML)

        .mediaType("rdfxml", MediaType.APPLICATION_XML)

        .mediaType("json", MediaType.APPLICATION_JSON);

        logger.debug("configureContentNegotiation");

    }

    /**

     * Create the CNVR.  Specify the view resolvers to use explicitly.  Get Spring to inject

     * the ContentNegotiationManager created by the configurer (see previous method).

     */

   @Bean

   public ViewResolver contentNegotiatingViewResolver(ContentNegotiationManager manager) {

       List<ViewResolver> resolvers = new ArrayList<ViewResolver>();

       resolvers.add(getPatternViewResolver("xml"));

       resolvers.add(getPatternViewResolver("json"));

       resolvers.add(getPatternViewResolver("rdf"));

       ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();

       resolver.setOrder(2);

       resolver.setContentNegotiationManager(manager);

       resolver.setViewResolvers(resolvers);

       logger.debug("contentNegotiatingViewResolver");

       return resolver;

       }

   private ViewResolver getPatternViewResolver(String type) {

       PatternViewResolver resolver = new PatternViewResolver();

       resolver.setLocation(new ServletContextResource(servletContext, "/WEB-INF/"+  type + "-views.xml"));

       resolver.setCache(XML_VIEW_CACHING);

       return resolver;

   }

}