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/*
 * SonarQube, open source software quality management tool.
 * Copyright (C) 2008-2014 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * SonarQube is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * SonarQube is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package org.sonar.api.utils;

/**
 * @since 3.6
 */
public class Paging {

  private final int pageSize;
  private final int pageIndex;
  private final int total;

  private Paging(int pageSize, int pageIndex, int total) {
    this.pageSize = pageSize;
    this.pageIndex = pageIndex;
    this.total = total;
  }

  /**
   * Page index, starting with 1.
   */
  public int pageIndex() {
    return pageIndex;
  }

  /**
   * Maximum number of items per page. It is greater than 0.
   */
  public int pageSize() {
    return pageSize;
  }

  /**
   * Total number of items. It is greater than or equal 0.
   */
  public int total() {
    return total;
  }

  public int offset(){
    return (pageIndex - 1) * pageSize;
  }

  /**
   * Number of pages. It is greater than or equal 0.
   */
  public int pages() {
    int p = total / pageSize;
    if (total % pageSize > 0) {
      p++;
    }
    return p;
  }

  /**
   *
   * @since 4.1
   */
  public boolean hasNextPage(){
    return pageIndex() < pages();
  }

  public static Paging create(int pageSize, int pageIndex, int totalItems) {
    if (pageSize<1) {
      throw new IllegalArgumentException("Page size must be strictly positive. Got " + pageSize);
    }
    if (pageIndex<1) {
      throw new IllegalArgumentException("Page index must be strictly positive. Got " + pageIndex);
    }
    if (totalItems<0) {
      throw new IllegalArgumentException("Total items must be positive. Got " + totalItems);
    }
    return new Paging(pageSize, pageIndex, totalItems);
  }
}