/*
    * 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.commons.monitoring.reporting.web.handler.internal;
  
  import org.apache.commons.monitoring.configuration.Configuration;
  import org.apache.commons.monitoring.reporting.web.handler.api.Regex;
  import org.apache.commons.monitoring.reporting.web.handler.api.TemplateHelper;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import java.lang.reflect.Method;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.regex.Pattern;
  
  public class EndpointInfo {
      private final Map<Pattern, Invoker> invokers = new HashMap<Pattern, Invoker>();
  
      public Map<Pattern, Invoker> getInvokers() {
          return invokers;
      }
  
      public static EndpointInfo build(final Class<?> endpointClass, final String id, final String rootMapping) {
          final EndpointInfo info = new EndpointInfo();
          final Object instance = Configuration.newInstance(endpointClass);
          for (final Method method : endpointClass.getMethods()) {
              if (method.getDeclaringClass() == Object.class) {
                  continue;
              }
  
              final Regex regex = method.getAnnotation(Regex.class);
              if (regex != null) {
                  final Pattern pattern = Pattern.compile(rootMapping + regex.value());
                  final Invoker invoker = new Invoker(instance, method, id);
                  int partIdx = 1; // regex index, it starts from 1
                  for (final Class<?> clazz : method.getParameterTypes()) {
                      if (HttpServletRequest.class.equals(clazz)) {
                          invoker.addRequestParameter();
                      } else if (HttpServletResponse.class.equals(clazz)) {
                          invoker.addResponseParameter();
                      } else if (TemplateHelper.class.equals(clazz)) {
                          invoker.addTemplateHelper(id);
                      } else {
                          invoker.addSegmentParameter(clazz, partIdx);
                          partIdx++;
                      }
                  }
                  info.invokers.put(pattern, invoker);
              }
          }
          return info;
      }
  }