/**
   * Generates assembler classes if the API returns more than one object.
   *
   * @param resources
   * @param templateGroup
   */
  private void generateModelClassesForInput(
      List<Resource> resources, StringTemplateGroup templateGroup) {
    List<String> generatedClasses = new ArrayList<String>();
    for (Resource resource : resources) {
      if (resource.getEndPoints() != null) {
        for (Endpoint endpoint : resource.getEndPoints()) {
          if (endpoint.getOperations() != null) {
            for (EndpointOperation operation : endpoint.getOperations()) {
              ResourceMethod method =
                  operation.generateMethod(
                      endpoint, resource, dataTypeMappingProvider, nameGenerator);
              if (method.getInputModel() != null) {
                Model model = method.getInputModel();
                if (model != null) {
                  if (!generatedClasses.contains(model.getName())) {
                    List<String> imports = new ArrayList<String>();
                    imports.addAll(this.config.getDefaultModelImports());
                    for (ModelField param : model.getFields()) {
                      param.setName(reservedWordMapper.translate(param.getName()));
                      for (String importDef :
                          param
                              .getFieldDefinition(
                                  this.getDataTypeMappingProvider(), config, nameGenerator)
                              .getImportDefinitions()) {
                        if (!imports.contains(importDef)) {
                          imports.add(importDef);
                        }
                      }
                    }
                    StringTemplate template = templateGroup.getInstanceOf(MODEL_OBJECT_TEMPLATE);

                    template.setAttribute("fields", model.getFields());
                    template.setAttribute("imports", imports);
                    template.setAttribute("extends", config.getDefaultModelBaseClass());
                    template.setAttribute(
                        "annotationPackageName", languageConfig.getAnnotationPackageName());
                    template.setAttribute("className", model.getGenratedClassName());
                    template.setAttribute(PACKAGE_NAME, config.getModelPackageName());
                    File aFile =
                        new File(
                            languageConfig.getModelClassLocation()
                                + model.getGenratedClassName()
                                + languageConfig.getClassFileExtension());
                    writeFile(aFile, template.toString(), "Input model class");
                    generatedClasses.add(model.getName());
                  }
                }
              }
            }
          }
        }
      }
    }
  }
  /**
   * Generates one API class for each resource and each end point in the resource is translated as
   * method.
   *
   * @param resources
   * @param templateGroup
   */
  private void generateAPIClasses(List<Resource> resources, StringTemplateGroup templateGroup) {

    for (Resource resource : resources) {
      try {
        List<ResourceMethod> methods = new ArrayList<ResourceMethod>();
        List<String> imports = new ArrayList<String>();
        imports.addAll(this.config.getDefaultServiceImports());
        methods =
            resource.generateMethods(
                resource, dataTypeMappingProvider, nameGenerator, languageConfig);
        StringTemplate template = templateGroup.getInstanceOf(API_OBJECT_TEMPLATE);
        String className = resource.generateClassName(nameGenerator);

        if (className != null) {
          List<ResourceMethod> filteredMethods = new ArrayList<ResourceMethod>();
          for (ResourceMethod method : methods) {
            if (!this.getCodeGenRulesProvider().isMethodIgnored(className, method.getName())) {
              filteredMethods.add(method);
            }
          }
          template.setAttribute("imports", imports);
          template.setAttribute(PACKAGE_NAME, config.getApiPackageName());
          template.setAttribute("annotationPackageName", languageConfig.getAnnotationPackageName());
          template.setAttribute("modelPackageName", config.getModelPackageName());
          template.setAttribute("exceptionPackageName", languageConfig.getExceptionPackageName());
          template.setAttribute("resource", className);
          template.setAttribute("methods", filteredMethods);
          template.setAttribute("extends", config.getServiceBaseClass(className));

          File aFile =
              new File(
                  languageConfig.getResourceClassLocation()
                      + resource.generateClassName(nameGenerator)
                      + languageConfig.getClassFileExtension());
          writeFile(aFile, template.toString(), "API Classes");
        }
      } catch (RuntimeException t) {
        System.out.println(
            "Failed generating api class for the resource : " + resource.getResourcePath());
        throw t;
      }
    }
  }
  private void generateOutputWrappers(List<Resource> resources, StringTemplateGroup templateGroup) {
    List<String> generatedClasses = new ArrayList<String>();
    StringTemplate template = templateGroup.getInstanceOf(WRAPPER_OBJECT_TEMPLATE);
    if (template == null) {
      System.out.println("WrapperObject template not found to generate output wrappers");
      return;
    }

    for (Resource resource : resources) {
      if (resource.getEndPoints() != null) {
        for (Endpoint endpoint : resource.getEndPoints()) {
          if (endpoint.getOperations() != null) {
            for (EndpointOperation operation : endpoint.getOperations()) {
              ResourceMethod method =
                  operation.generateMethod(
                      endpoint, resource, dataTypeMappingProvider, nameGenerator);
              if (codeGenRulesProvider.isModelIgnored(
                  nameGenerator.applyMethodNamingPolicy(method.getReturnClassName()))) {
                continue;
              }
              if (method.getListWrapperModel() != null) {
                Model model = method.getListWrapperModel();
                method.setReturnClassName(model.getName());
                if (model != null) {
                  if (!generatedClasses.contains(model.getName())) {
                    List<String> imports = new ArrayList<String>();
                    imports.addAll(this.config.getDefaultModelImports());
                    for (ModelField param : model.getFields()) {
                      for (String importDef :
                          param
                              .getFieldDefinition(
                                  this.getDataTypeMappingProvider(), config, nameGenerator)
                              .getImportDefinitions()) {
                        if (!imports.contains(importDef)) {
                          imports.add(importDef);
                        }
                      }
                    }
                    template = templateGroup.getInstanceOf(WRAPPER_OBJECT_TEMPLATE);

                    template.setAttribute("fields", model.getFields());
                    template.setAttribute("imports", imports);
                    template.setAttribute("extends", config.getDefaultModelBaseClass());
                    template.setAttribute(
                        "annotationPackageName", languageConfig.getAnnotationPackageName());
                    template.setAttribute("className", model.getGenratedClassName());
                    template.setAttribute(PACKAGE_NAME, config.getModelPackageName());
                    File aFile =
                        new File(
                            languageConfig.getModelClassLocation()
                                + model.getGenratedClassName()
                                + languageConfig.getClassFileExtension());
                    writeFile(aFile, template.toString(), "List wrapper model class");
                    generatedClasses.add(model.getName());
                  }
                }
              }
            }
          }
        }
      }
    }
  }