content: /*
   * Copyright 2017, The Android Open Source Project
   *
   * 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.
   */
  
  package com.example.android.persistence.db;
  
  import com.example.android.persistence.db.entity.CommentEntity;
  import com.example.android.persistence.db.entity.ProductEntity;
  import com.example.android.persistence.model.Product;
  
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  import java.util.Random;
  import java.util.concurrent.TimeUnit;
  
  /**
   * Generates data to pre-populate the database
   */
  public class DataGenerator {
  
      private static final String[] FIRST = new String[]{
              "Special edition", "New", "Cheap", "Quality", "Used"};
      private static final String[] SECOND = new String[]{
              "Three-headed Monkey", "Rubber Chicken", "Pint of Grog", "Monocle"};
      private static final String[] DESCRIPTION = new String[]{
              "is finally here", "is recommended by Stan S. Stanman",
              "is the best sold product on Mêlée Island", "is \uD83D\uDCAF", "is ❤️", "is fine"};
      private static final String[] COMMENTS = new String[]{
              "Comment 1", "Comment 2", "Comment 3", "Comment 4", "Comment 5", "Comment 6"};
  
      public static List<ProductEntity> generateProducts() {
          List<ProductEntity> products = new ArrayList<>(FIRST.length * SECOND.length);
          Random rnd = new Random();
          for (int i = 0; i < FIRST.length; i++) {
              for (int j = 0; j < SECOND.length; j++) {
                  ProductEntity product = new ProductEntity();
                  product.setName(FIRST[i] + " " + SECOND[j]);
                  product.setDescription(product.getName() + " " + DESCRIPTION[j]);
                  product.setPrice(rnd.nextInt(240));
                  product.setId(FIRST.length * i + j + 1);
                  products.add(product);
              }
          }
          return products;
      }
  
      public static List<CommentEntity> generateCommentsForProducts(
              final List<ProductEntity> products) {
          List<CommentEntity> comments = new ArrayList<>();
          Random rnd = new Random();
  
          for (Product product : products) {
              int commentsNumber = rnd.nextInt(5) + 1;
              for (int i = 0; i < commentsNumber; i++) {
                  CommentEntity comment = new CommentEntity();
                  comment.setProductId(product.getId());
                  comment.setText(COMMENTS[i] + " for " + product.getName());
                  comment.setPostedAt(new Date(System.currentTimeMillis()
                          - TimeUnit.DAYS.toMillis(commentsNumber - i) + TimeUnit.HOURS.toMillis(i)));
                  comments.add(comment);
              }
          }
  
          return comments;
      }
  }
  