package com.atlassian.plugins.rest.module.template;
   
   import java.io.IOException;
   import java.io.OutputStreamWriter;
   import java.util.Map;
   
   import org.apache.commons.lang.StringUtils;
   
   import com.atlassian.templaterenderer.TemplateRenderer;
  import com.atlassian.plugins.rest.common.template.Renderer;
  import com.google.common.base.Preconditions;
  import com.google.common.collect.Maps;
  import com.sun.jersey.api.core.HttpContext;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  public class RendererImpl implements Renderer {
      private final TemplateRenderer templateRenderer;
      private final OutputStreamWriter writer;
      private final HttpContext httpContext;
      private final HttpServletRequest httpServletRequest;
      private final HttpServletResponse httpServletResponse;
  
      RendererImpl(final TemplateRenderer templateRenderer, final OutputStreamWriter writer,
                   final HttpContext httpContext, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {
          this.templateRenderer = Preconditions.checkNotNull(templateRenderer);
          this.writer = Preconditions.checkNotNull(writer);
          this.httpContext = Preconditions.checkNotNull(httpContext);
          this.httpServletRequest = httpServletRequest;
          this.httpServletResponse = httpServletResponse;
      }
  
      public void render(final Object model, final String template) throws IOException {
          final Map<String, Object> context = Maps.newHashMap();
          context.put("it", model);
          context.put("renderer", this);
          context.put("httpContext", httpContext);
          context.put("request", httpServletRequest);
          context.put("response", httpServletResponse);
  
          templateRenderer.render(getAbsolutePath(model.getClass(), template), context, writer);
      }
  
      private String getAbsolutePath(final Class<?> resourceClass, String path) {
          // absolute path
          if (StringUtils.startsWith(path, "/")) {
              return path;
          }
  
          // undefined, defaults to index
          if (StringUtils.isEmpty(path) || StringUtils.equals(path, "/")) {
              path = "index";
          }
  
          return getAbsolutePath(resourceClass) + '/' + path;
      }
  
      private String getAbsolutePath(final Class<?> resourceClass) {
          return '/' + resourceClass.getName().replace('.', '/').replace('$', '/');
      }
  }