/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * 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.
   */
  
  package org.apache.myfaces.tobago.facelets;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import javax.servlet.annotation.WebFilter;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletRequestWrapper;
  import javax.servlet.http.HttpServletResponse;
  import java.io.IOException;
  import java.lang.invoke.MethodHandles;
  
  // XXX hack, whould be nice to find a ES6/TypeScript conform way.
  
  @WebFilter(urlPatterns = "/*")
  public class HackResourceExtentionFilter implements Filter {
  
    private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
    private String prefix;
  
    @Override
    public void init(final FilterConfig filterConfig) throws ServletException {
      if (LOG.isInfoEnabled()) {
        LOG.info("Filter initialized.");
      }
      final String version = Package.getPackage("org.apache.myfaces.tobago.component").getImplementationVersion();
      final String contextPath = filterConfig.getServletContext().getContextPath();
      prefix = contextPath + "/tobago/standard/" + version + "/js/";
    }
  
    @Override
    public void doFilter(
        final ServletRequest servletRequest, final ServletResponse servletResponse, final FilterChain filterChain)
        throws IOException, ServletException {
      if (servletRequest instanceof HttpServletRequest && servletResponse instanceof HttpServletResponse) {
        final HttpServletRequest request = (HttpServletRequest) servletRequest;
        final String requestUri = request.getRequestURI();
        if (requestUri.startsWith(prefix) && !requestUri.endsWith(".js") && !requestUri.endsWith(".map")) {
          HttpServletRequestWrapper wrapper = new HttpServletRequestWrapper(request) {
            @Override
            public String getRequestURI() {
              return super.getRequestURI() + ".js";
            }
            @Override
            public String getServletPath() {
              return super.getServletPath() + ".js";
            }
  
            @Override
            public StringBuffer getRequestURL() {
              final StringBuffer buffer = super.getRequestURL();
              buffer.append(".js");
              return buffer;
            }
          };
          filterChain.doFilter(wrapper, servletResponse);
        } else {
          filterChain.doFilter(servletRequest, servletResponse);
        }
      } else {
        filterChain.doFilter(servletRequest, servletResponse);
      }
    }
  
    @Override
    public void destroy() {
    }
  }