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package com.clickntap.utils;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Pager implements Serializable {

  private int pageNumber;

  private int numberOfLinks;

  private int numberOfRows;

  private List page;

  private int numberOfPages;

  private int size;

  private int fromRow;

  private int toRow;

  public Pager(int numberOfLinks, int numberOfRows) {
    this.pageNumber = 1;
    this.numberOfLinks = numberOfLinks > 0 ? numberOfLinks : 5;
    this.numberOfRows = numberOfRows > 0 ? numberOfRows : 5;
  }

  public Pager selectPage(List list, int pageNumber) throws Exception {
    this.pageNumber = pageNumber > 0 ? pageNumber : 1;
    size = (list != null ? list.size() : 0);
    numberOfPages = size / numberOfRows;
    if (size % numberOfRows > 0)
      numberOfPages++;
    if (pageNumber > numberOfPages)
      pageNumber = numberOfPages;
    fromRow = ((pageNumber - 1) * numberOfRows);
    toRow = fromRow + numberOfRows;
    if (toRow >= size)
      toRow = size;
    if (fromRow < 0)
      fromRow = 0;
    if (list != null)
      page = list.subList(fromRow, toRow);
    return this;
  }

  public List getLinks() {
    List links = new ArrayList();

    int s, e;
    int m = (numberOfLinks / 2);

    if (pageNumber > numberOfPages - m) {
      e = numberOfPages;
      s = e - numberOfLinks + 1;
      if (s < 1)
        s = 1;
    } else {
      s = pageNumber - m;
      if (s < 1)
        s = 1;
      e = s + numberOfLinks - 1;
      if (e > numberOfPages)
        e = numberOfPages;
    }

    for (int i = s; i <= e; i++)
      links.add(i);

    return links;
  }

  public List getPage() {
    return page;
  }

  public int getLastPage() {
    return getNumberOfPages();
  }

  public int getNumberOfPages() {
    return numberOfPages;
  }

  public int getFromRow() {
    return fromRow;
  }

  public int getToRow() {
    return toRow - 1;
  }

  public int getPageNumber() {
    return pageNumber;
  }

  public void setPageNumber(int pageNumber) {
    this.pageNumber = pageNumber;
  }

  public boolean isFirst() {
    return pageNumber == 1;
  }

  public boolean isLast() {
    return pageNumber == numberOfPages || size == 0;
  }

  public int getPrevPage() {
    return (!isFirst() ? pageNumber - 1 : 1);
  }

  public int getNextPage() {
    return (!isLast() ? pageNumber + 1 : numberOfPages);
  }

  public int getSize() {
    return size;
  }

  public void refreshList(List list) throws Exception {
    selectPage(list, getPageNumber());
  }

}