/*
    * #%L
    * wcm.io
    * %%
    * Copyright (C) 2022 wcm.io
    * %%
    * Licensed 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.
   * #L%
   */
  package io.wcm.siteapi.processor.impl.content;
  
  import static com.adobe.cq.export.json.ExporterConstants.SLING_MODEL_EXTENSION;
  import static com.adobe.cq.export.json.ExporterConstants.SLING_MODEL_SELECTOR;
  import static io.wcm.siteapi.processor.ProcessorConstants.PROCESSOR_CONTENT;
  import static io.wcm.siteapi.processor.ProcessorConstants.PROPERTY_SUFFIX;
  
  import java.io.IOException;
  
  import javax.servlet.RequestDispatcher;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.sling.api.SlingHttpServletResponse;
  import org.jetbrains.annotations.NotNull;
  import org.osgi.service.component.annotations.Component;
  import org.osgi.service.component.annotations.ConfigurationPolicy;
  import org.osgi.service.component.propertytypes.ServiceRanking;
  import org.osgi.service.metatype.annotations.AttributeDefinition;
  import org.osgi.service.metatype.annotations.Designate;
  import org.osgi.service.metatype.annotations.ObjectClassDefinition;
  
  import io.wcm.siteapi.processor.Processor;
  import io.wcm.siteapi.processor.ProcessorRequestContext;
  import io.wcm.siteapi.processor.SlingHttpServletProcessor;
  
  /**
   * Page content.
   * Forwards request to "model.json" version view of the page.
   */
  @Designate(ocd = ContentProcessor.Config.class)
  @Component(service = Processor.class, configurationPolicy = ConfigurationPolicy.REQUIRE,
      property = PROPERTY_SUFFIX + "=" + PROCESSOR_CONTENT)
  @ServiceRanking(-500)
  public class ContentProcessor implements SlingHttpServletProcessor {
  
    @ObjectClassDefinition(
        name = "wcm.io Site API Content Processor",
        description = "Provides model.json content of a page.")
    @interface Config {
  
      @AttributeDefinition(
          name = "Enabled",
          description = "Processor is enabled.")
      boolean enabled() default false;
  
    }
  
    @Override
    public void process(@NotNull ProcessorRequestContext context, @NotNull SlingHttpServletResponse response)
        throws ServletException, IOException {
      String modelJsonUri = context.getPage().getPath() + "." + SLING_MODEL_SELECTOR + "." + SLING_MODEL_EXTENSION;
      RequestDispatcher requestDispatcher = context.getRequest().getRequestDispatcher(modelJsonUri);
      if (requestDispatcher != null) {
        requestDispatcher.forward(context.getRequest(), response);
      }
      else {
        response.sendError(HttpServletResponse.SC_NOT_FOUND);
      }
    }
  
  }