<?php

namespace Carbon\Traits;

/**
 * Trait Week.
 *
 * week and ISO week number, year and count in year.
 *
 * Depends on the following properties:
 *
 * @property int $daysInYear
 * @property int $dayOfWeek
 * @property int $dayOfYear
 * @property int $year
 *
 * Depends on the following methods:
 *
 * @method static addWeeks(int $weeks = 1)
 * @method static copy()
 * @method static dayOfYear(int $dayOfYear)
 * @method string getTranslationMessage(string $key, ?string $locale = null, ?string $default = null, $translator = null)
 * @method static next(int|string $day = null)
 * @method static startOfWeek(int $day = 1)
 * @method static subWeeks(int $weeks = 1)
 * @method static year(int $year = null)
 */
trait Week
{
	/**
	 * Set/get the week number of year using given first day of week and first
	 * day of year included in the first week. Or use ISO format if no settings
	 * given.
	 *
	 * @param int|null $year      if null, act as a getter, if not null, set the year and return current instance.
	 * @param int|null $dayOfWeek first date of week from 0 (Sunday) to 6 (Saturday)
	 * @param int|null $dayOfYear first day of year included in the week #1
	 *
	 * @return int|static
	 */
	public function isoWeekYear($year = null, $dayOfWeek = null, $dayOfYear = null)
	{
		return $this->weekYear(
		    $year,
		    $dayOfWeek ?? 1,
		    $dayOfYear ?? 4
		);
	}


	/**
	 * Set/get the week number of year using given first day of week and first
	 * day of year included in the first week. Or use US format if no settings
	 * given (Sunday / Jan 6).
	 *
	 * @param int|null $year      if null, act as a getter, if not null, set the year and return current instance.
	 * @param int|null $dayOfWeek first date of week from 0 (Sunday) to 6 (Saturday)
	 * @param int|null $dayOfYear first day of year included in the week #1
	 *
	 * @return int|static
	 */
	public function weekYear($year = null, $dayOfWeek = null, $dayOfYear = null)
	{
		$dayOfWeek = $dayOfWeek ?? $this->getTranslationMessage('first_day_of_week') ?? 0;
		$dayOfYear = $dayOfYear ?? $this->getTranslationMessage('day_of_first_week_of_year') ?? 1;

		if ($year !== null) {
		    $year = (int) round($year);

		    if ($this->weekYear(null, $dayOfWeek, $dayOfYear) === $year) {
		        return $this->avoidMutation();
		    }

		    $week = $this->week(null, $dayOfWeek, $dayOfYear);
		    $day = $this->dayOfWeek;
		    $date = $this->year($year);
		    switch ($date->weekYear(null, $dayOfWeek, $dayOfYear) - $year) {
		        case 1:
		            $date = $date->subWeeks(26);

		            break;
		        case -1:
		            $date = $date->addWeeks(26);

		            break;
		    }

		    $date = $date->addWeeks($week - $date->week(null, $dayOfWeek, $dayOfYear))->startOfWeek($dayOfWeek);

		    if ($date->dayOfWeek === $day) {
		        return $date;
		    }

		    return $date->next($day);
		}

		$year = $this->year;
		$day = $this->dayOfYear;
		$date = $this->avoidMutation()->dayOfYear($dayOfYear)->startOfWeek($dayOfWeek);

		if ($date->year === $year && $day < $date->dayOfYear) {
		    return $year - 1;
		}

		$date = $this->avoidMutation()->addYear()->dayOfYear($dayOfYear)->startOfWeek($dayOfWeek);

		if ($date->year === $year && $day >= $date->dayOfYear) {
		    return $year + 1;
		}

		return $year;
	}


	/**
	 * Get the number of weeks of the current week-year using given first day of week and first
	 * day of year included in the first week. Or use ISO format if no settings
	 * given.
	 *
	 * @param int|null $dayOfWeek first date of week from 0 (Sunday) to 6 (Saturday)
	 * @param int|null $dayOfYear first day of year included in the week #1
	 *
	 * @return int
	 */
	public function isoWeeksInYear($dayOfWeek = null, $dayOfYear = null)
	{
		return $this->weeksInYear(
		    $dayOfWeek ?? 1,
		    $dayOfYear ?? 4
		);
	}


	/**
	 * Get the number of weeks of the current week-year using given first day of week and first
	 * day of year included in the first week. Or use US format if no settings
	 * given (Sunday / Jan 6).
	 *
	 * @param int|null $dayOfWeek first date of week from 0 (Sunday) to 6 (Saturday)
	 * @param int|null $dayOfYear first day of year included in the week #1
	 *
	 * @return int
	 */
	public function weeksInYear($dayOfWeek = null, $dayOfYear = null)
	{
		$dayOfWeek = $dayOfWeek ?? $this->getTranslationMessage('first_day_of_week') ?? 0;
		$dayOfYear = $dayOfYear ?? $this->getTranslationMessage('day_of_first_week_of_year') ?? 1;
		$year = $this->year;
		$start = $this->avoidMutation()->dayOfYear($dayOfYear)->startOfWeek($dayOfWeek);
		$startDay = $start->dayOfYear;
		if ($start->year !== $year) {
		    $startDay -= $start->daysInYear;
		}
		$end = $this->avoidMutation()->addYear()->dayOfYear($dayOfYear)->startOfWeek($dayOfWeek);
		$endDay = $end->dayOfYear;
		if ($end->year !== $year) {
		    $endDay += $this->daysInYear;
		}

		return (int) round(($endDay - $startDay) / 7);
	}


	/**
	 * Get/set the week number using given first day of week and first
	 * day of year included in the first week. Or use US format if no settings
	 * given (Sunday / Jan 6).
	 *
	 * @param int|null $week
	 * @param int|null $dayOfWeek
	 * @param int|null $dayOfYear
	 *
	 * @return int|static
	 */
	public function week($week = null, $dayOfWeek = null, $dayOfYear = null)
	{
		$date = $this;
		$dayOfWeek = $dayOfWeek ?? $this->getTranslationMessage('first_day_of_week') ?? 0;
		$dayOfYear = $dayOfYear ?? $this->getTranslationMessage('day_of_first_week_of_year') ?? 1;

		if ($week !== null) {
		    return $date->addWeeks(round($week) - $this->week(null, $dayOfWeek, $dayOfYear));
		}

		$start = $date->avoidMutation()->dayOfYear($dayOfYear)->startOfWeek($dayOfWeek);
		$end = $date->avoidMutation()->startOfWeek($dayOfWeek);
		if ($start > $end) {
		    $start = $start->subWeeks(26)->dayOfYear($dayOfYear)->startOfWeek($dayOfWeek);
		}
		$week = (int) ($start->diffInDays($end) / 7 + 1);

		return $week > $end->weeksInYear($dayOfWeek, $dayOfYear) ? 1 : $week;
	}


	/**
	 * Get/set the week number using given first day of week and first
	 * day of year included in the first week. Or use ISO format if no settings
	 * given.
	 *
	 * @param int|null $week
	 * @param int|null $dayOfWeek
	 * @param int|null $dayOfYear
	 *
	 * @return int|static
	 */
	public function isoWeek($week = null, $dayOfWeek = null, $dayOfYear = null)
	{
		return $this->week(
		    $week,
		    $dayOfWeek ?? 1,
		    $dayOfYear ?? 4
		);
	}
}
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