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<?php |
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namespace BusinessDays; |
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/** |
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* Class Calculator |
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* |
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* @package BusinessDays |
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*/ |
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class Calculator { |
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const MONDAY = 1; |
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const TUESDAY = 2; |
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const WEDNESDAY = 3; |
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const THURSDAY = 4; |
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const FRIDAY = 5; |
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const SATURDAY = 6; |
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const SUNDAY = 7; |
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const WEEK_DAY_FORMAT = 'N'; |
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const HOLIDAY_FORMAT = 'm-d'; |
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const FREE_DAY_FORMAT = 'Y-m-d'; |
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/** @var \DateTime[] */ |
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private $holidays = array(); |
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/** @var \DateTime[] */ |
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private $freeDays = array(); |
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/** @var int[] */ |
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private $freeWeekDays = array(self::SATURDAY, self::SUNDAY); |
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/** |
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* @param \DateTime[] $holidays Array of holidays that repeats each year. (Only month and date is used to match). |
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* |
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* @return $this |
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*/ |
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public function setHolidays(array $holidays) { |
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$this->holidays = $holidays; |
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} |
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/** |
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* @return \DateTime[] |
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*/ |
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private function getHolidays() { |
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return $this->holidays; |
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} |
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/** |
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* @param \DateTime[] $freeDays Array of free days that dose not repeat. |
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* |
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* @return $this |
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*/ |
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public function setFreeDays(array $freeDays) { |
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$this->freeDays = $freeDays; |
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} |
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/** |
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* @return \DateTime[] |
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*/ |
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private function getFreeDays() { |
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return $this->freeDays; |
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} |
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/** |
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* @param int[] $freeWeekDays Array of days of the week which are not business days. |
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* |
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* @return $this |
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*/ |
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public function setFreeWeekDays(array $freeWeekDays) { |
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$this->freeWeekDays = $freeWeekDays; |
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} |
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/** |
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* @return int[] |
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*/ |
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private function getFreeWeekDays() { |
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if (count($this->freeWeekDays) >= 7) { |
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throw new \InvalidArgumentException('Too many non business days provided'); |
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} |
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return $this->freeWeekDays; |
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} |
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/** |
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* @param int $x |
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* |
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* @return $x |
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*/ |
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private function determineSign($x) { |
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return $x > 0 ? 1 : -1; |
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} |
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/** |
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* @param int $howManyDays |
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* |
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* @return $newBusinessDate |
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*/ |
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public function addBusinessDays(\DateTime $date, $amount) { |
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$dates = $this->getBusinessDays($date, $amount); |
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return $dates[array_key_last($dates)]; |
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} |
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/** |
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* @param datetime $startDate |
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* @param int $howManyDays |
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* |
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* @return array $businessDates |
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*/ |
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public function getBusinessDays(\DateTime $date, $amount) { |
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if ($amount === 0 || is_nan($amount)) { return array($date); } |
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$dates = array(); |
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$sign = $this->determineSign($amount); |
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$absIncrement = abs($amount); |
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$newdate = clone $date; |
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$iterator = 0; |
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while ($iterator < $absIncrement) { |
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$newdate->modify($sign . ' day'); |
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if ($this->isBusinessDay($newdate)) { |
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$dates[] = clone $newdate; |
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$iterator++; |
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} |
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} |
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return $dates; |
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} |
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/** |
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* @param \DateTime $date |
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* |
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* @return bool |
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*/ |
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public function isBusinessDay(\DateTime $date) { |
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if ($this->isFreeWeekDayDay($date) || $this->isHoliday($date) || $this->isFreeDay($date)) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* @param \DateTime $date |
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* |
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* @return bool |
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*/ |
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public function isFreeWeekDayDay(\DateTime $date) { |
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$currentWeekDay = (int)$date->format(self::WEEK_DAY_FORMAT); |
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if (in_array($currentWeekDay, $this->getFreeWeekDays())) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @param \DateTime $date |
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* |
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* @return bool |
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*/ |
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public function isHoliday(\DateTime $date) { |
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$holidayFormatValue = $date->format(self::HOLIDAY_FORMAT); |
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foreach ($this->getHolidays() as $holiday) { |
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if ($holidayFormatValue == $holiday->format(self::HOLIDAY_FORMAT)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param \DateTime $date |
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* |
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* @return bool |
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*/ |
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public function isFreeDay(\DateTime $date) { |
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$freeDayFormatValue = $date->format(self::FREE_DAY_FORMAT); |
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foreach ($this->getFreeDays() as $freeDay) { |
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if ($freeDayFormatValue == $freeDay->format(self::FREE_DAY_FORMAT)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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