package org.jcr_blog.commons.gravatar;
   
   import com.google.common.base.Joiner;
   import com.google.common.hash.Hashing;
   import java.util.ArrayList;
   import java.util.List;
   import javax.enterprise.context.ApplicationScoped;
   import javax.inject.Named;
   
  /**
   *
   * @author Sebastian Prehn <sebastian.prehn@planetswebdesign.de>
   */
  @Named
  @ApplicationScoped
  public class Gravatar {
  
      private static final String GRAVATAR_URL_HTTP = "http://www.gravatar.com/avatar/";
      private static final String GRAVATAR_URL_HTTPS = "https://secure.gravatar.com/avatar/";
      
      /**
       * Creates the Gravatar URL for the given email address.
       * Uses gravatar defaults: size (80), default rating (general audience).
       * Default Icon is mystery-man.
       * @param email the email address of the gravatar user
       * @return the gravatar url
       */
      public String fromMail(final String email) {
          return fromParameter(new Parameter(email).secure(false).defaultImage(DefaultImage.MysteryMan));
      }
  
      /**
       * Creates the Gravatar URL for the given email address.
       * Uses gravatar defaults: size (80), default rating (general audience).
       * Default Icon is mystery-man.
       * @param email the email address of the gravatar user
       * @param secure use (https) or none secure (http) connection
       * @return the gravatar url
       */
      public String fromMail(final String email, final boolean secure) {
          return fromParameter(new Parameter(email).secure(secure).defaultImage(DefaultImage.MysteryMan));
      }
  
      public String fromParameter(final Parameter param) {
          if (param == null) {
              throw new IllegalArgumentException("param must not be null");
          }
          StringBuilder result = new StringBuilder();
          result.append(param.isSecure() ? GRAVATAR_URL_HTTPS : GRAVATAR_URL_HTTP);
          result.append(Hashing.md5().hashBytes(param.getEmail().toLowerCase().trim().getBytes()).toString());
          result.append(".jpg");
          
          final List<String> params = new ArrayList<String>();
  
          if (param.getSize() != null) {
              params.add("s=" + param.getSize());
          }
          if (param.getRating() != null) {
              params.add("r=" + param.getRating().getCode());
          }
          if (param.getDefaultImage() != null) {
              params.add("d=" + param.getDefaultImage().getCode());
          }
          if(param.isForceDefault()) {
              params.add("f=y");
          }
          if (!params.isEmpty()) {
              result.append("?");
              result.append(Joiner.on("&").join(params.iterator()));
          }
  
          return result.toString();
      }
  }