<?php

/*
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  | CiviCRM version 5                                                  |
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  | Copyright CiviCRM LLC (c) 2004-2017                                |
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  | This file is a part of CiviCRM.                                    |
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  | CiviCRM is free software; you can copy, modify, and distribute it  |
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 */

/**
 *  File for the DateTest class
 *
 *  (PHP 5)
 *
 * @author Jon Goldberg <jon@megaphonetech.com>
 */

/**
 *  Test CRM_Utils_Date functions.
 *
 * @package   CiviCRM
 * @group headless
 */
class CRM_Utils_DateTest extends CiviUnitTestCase {

  public function setUp() {
    // There are only unit tests here at present, we can skip database loading.
    return TRUE;
  }

  public function tearDown() {
    // There are only unit tests here at present, we can skip database loading.
    return TRUE;
  }

  public function fromToData() {
    $cases = array();
    // Absolute dates
    $cases[] = array('20170901000000', '20170913235959', 0, '09/01/2017', '09/13/2017');
    // "Today" relative date filter
    $date = new DateTime();
    $expectedFrom = $date->format('Ymd') . '000000';
    $expectedTo = $date->format('Ymd') . '235959';
    $cases[] = array($expectedFrom, $expectedTo, 'this.day', '', '');
    // "yesterday" relative date filter
    $date = new DateTime();
    $date->sub(new DateInterval('P1D'));
    $expectedFrom = $date->format('Ymd') . '000000';
    $expectedTo = $date->format('Ymd') . '235959';
    $cases[] = array($expectedFrom, $expectedTo, 'previous.day', '', '');
    return $cases;
  }

  /**
   * Test that getFromTo returns the correct dates.
   *
   * @dataProvider fromToData
   * @param $expectedFrom
   * @param $expectedTo
   * @param $relative
   * @param $from
   * @param $to
   */
  public function testGetFromTo($expectedFrom, $expectedTo, $relative, $from, $to) {
    $obj = new CRM_Utils_Date();
    list($calculatedFrom, $calculatedTo) = $obj->getFromTo($relative, $from, $to);
    $this->assertEquals($expectedFrom, $calculatedFrom);
    $this->assertEquals($expectedTo, $calculatedTo);
  }

  /**
   * Test relativeToAbsolute function on a range of fiscal year options.
   *
   * Go backwards one year at a time through the sequence.
   */
  public function testRelativeToAbsoluteFiscalYear() {
    $sequence = ['this', 'previous', 'previous_before'];
    Civi::settings()->set('fiscalYearStart', ['M' => 7, 'd' => 1]);
    $fiscalYearStartYear = (strtotime('now') > strtotime((date('Y-07-01')))) ? date('Y') : (date('Y') - 1);

    foreach ($sequence as $relativeString) {
      $date = CRM_Utils_Date::relativeToAbsolute($relativeString, 'fiscal_year');
      $this->assertEquals([
        'from' => $fiscalYearStartYear . '0701',
        'to' => ($fiscalYearStartYear + 1) . '0630'
      ], $date, 'relative term is ' . $relativeString);

      $fiscalYearStartYear--;
    }
  }

  /**
   * Test relativeToAbsolute function on a range of year options.
   *
   * Go backwards one year at a time through the sequence.
   */
  public function testRelativeToAbsoluteYear() {
    $sequence = ['this', 'previous', 'previous_before'];
    $year = date('Y');

    foreach ($sequence as $relativeString) {
      $date = CRM_Utils_Date::relativeToAbsolute($relativeString, 'year');
      $this->assertEquals([
        'from' => $year . '0101',
        'to' => $year . '1231',
      ], $date, 'relative term is ' . $relativeString);

      $year--;
    }
  }

  /**
   * Test relativeToAbsolute function on a range of year options.
   *
   * Go backwards one year at a time through the sequence.
   */
  public function testRelativeToAbsoluteYearRange() {
    $sequence = ['previous_2'];
    $lastYear = (date('Y') - 1);

    foreach ($sequence as $relativeString) {
      $date = CRM_Utils_Date::relativeToAbsolute($relativeString, 'year');
      // For previous 2 years the range is e.g 2016-01-01 to 2017-12-31 so we have to subtract
      // one from the range count to reflect the calendar year being one less apart due
      // to it being from the beginning of one to the end of the next.
      $offset = (substr($relativeString, -1, 1)) - 1;
      $this->assertEquals([
        'from' => $lastYear - $offset . '0101',
        'to' => $lastYear  . '1231',
      ], $date, 'relative term is ' . $relativeString);
    }
  }

  /**
   * Test relativeToAbsolute function on a range of year options.
   *
   * Go backwards one year at a time through the sequence.
   */
  public function testRelativeToAbsoluteFiscalYearRange() {
    $sequence = ['previous_2', 'previous_3', 'previous_4'];
    Civi::settings()->set('fiscalYearStart', ['M' => 7, 'd' => 1]);
    $lastFiscalYearEnd = (strtotime('now') > strtotime((date('Y-07-01')))) ? (date('Y')) : (date('Y') - 1);

    foreach ($sequence as $relativeString) {
      $date = CRM_Utils_Date::relativeToAbsolute($relativeString, 'fiscal_year');
      // For previous 2 years the range is e.g 2015-07-01 to 2017-06-30 so we have to subtract
      // one from the range count to reflect the calendar year being one less apart due
      // to it being from the beginning of one to the end of the next.
      $offset = (substr($relativeString, -1, 1));
      $this->assertEquals([
        'from' => $lastFiscalYearEnd - $offset . '0701',
        'to' => $lastFiscalYearEnd  . '0630',
      ], $date, 'relative term is ' . $relativeString);
    }
  }

}