/*
 * 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.jclouds.chef.predicates;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Iterables.any;
import static com.google.common.collect.Iterables.get;

import org.jclouds.chef.domain.CookbookVersion;
import org.jclouds.chef.domain.Resource;

import com.google.common.base.Predicate;
import com.google.common.base.Splitter;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Multimap;

/**
 * Container for cookbook filters (predicates).
 * 
 * This class has static methods that create customized predicates to use with
 * {@link org.jclouds.chef.ChefService}.
 */
public class CookbookVersionPredicates {
   /**
    * @see #containsRecipes
    */
   public static Predicate<CookbookVersion> containsRecipe(String recipe) {
      return containsRecipes(checkNotNull(recipe, "recipe must be defined"));
   }

   /**
    * Note that the default recipe of a cookbook is its name. Otherwise, you
    * prefix the recipe with the name of the cookbook. ex. {@code apache2} will
    * be the default recipe where {@code apache2::mod_proxy} is a specific one
    * in the cookbook.
    * 
    * @param recipes
    *           names of the recipes.
    * @return true if the cookbook version contains a recipe in the list.
    */
   public static Predicate<CookbookVersion> containsRecipes(String... recipes) {
      checkNotNull(recipes, "recipes must be defined");
      final Multimap<String, String> search = LinkedListMultimap.create();
      for (String recipe : recipes) {
         if (recipe.indexOf("::") != -1) {
            Iterable<String> nameRecipe = Splitter.on("::").split(recipe);
            search.put(get(nameRecipe, 0), get(nameRecipe, 1) + ".rb");
         } else {
            search.put(recipe, "default.rb");
         }
      }
      return new Predicate<CookbookVersion>() {
         @Override
         public boolean apply(final CookbookVersion cookbookVersion) {
            return search.containsKey(cookbookVersion.getCookbookName())
                  && any(search.get(cookbookVersion.getCookbookName()), new Predicate<String>() {

                     @Override
                     public boolean apply(final String recipeName) {
                        return any(cookbookVersion.getRecipes(), new Predicate<Resource>() {

                           @Override
                           public boolean apply(Resource resource) {
                              return resource.getName().equals(recipeName);
                           }

                        });
                     }

                  });
         }

         @Override
         public String toString() {
            return "containsRecipes(" + search + ")";
         }
      };
   }
}