<?php

declare(strict_types = 1);

/**
 * This file is part of the 'Yasumi' package.
 *
 * The easy PHP Library for calculating holidays.
 *
 * Copyright (c) 2015 - 2026 AzuyaLabs
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @author Sacha Telgenhof <me at sachatelgenhof dot com>
 */

namespace Yasumi\Provider;

use Yasumi\Exception\UnknownLocaleException;
use Yasumi\Holiday;

/**
 * Trait CommonHolidays.
 *
 * Trait containing commonly known holidays that are celebrated in all / many countries in the world.
 */
trait CommonHolidays
{
    /**
     * New Year's Day.
     *
     * New Year's Day is observed on January 1, the first day of the year on the modern Gregorian calendar as well as
     * the Julian calendar. As a date in the Gregorian calendar of Christendom, New Year's Day liturgically marked the
     * Feast of the Circumcision of Christ, and is still observed as such in the Anglican Church and Lutheran Church.
     * In present day, with most countries now using the Gregorian calendar as their de facto calendar, New Year's Day
     * is probably the most celebrated public holiday, often observed with fireworks at the stroke of midnight as the
     * new year starts in each time zone.
     *
     * @see https://en.wikipedia.org/wiki/New_Year%27s_Day
     *
     * @param int    $year     the year for which New Year's Day need to be created
     * @param string $timezone the timezone in which New Year's Day is celebrated
     * @param string $locale   the locale for which New Year's Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function newYearsDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday('newYearsDay', [], new \DateTime("{$year}-1-1", DateTimeZoneFactory::getDateTimeZone($timezone)), $locale, $type);
    }

    /**
     * International Workers' Day.
     *
     * International Workers' Day, also known as Labour Day in some places, is a celebration of laborers and the working
     * classes that is promoted by the international labor movement, Anarchists, Socialists, and Communists and occurs
     * every year on May Day, 1 May, an ancient European spring holiday. 1 May was chosen as the date for International
     * Workers' Day by the Socialists and Communists of the Second International to commemorate the Haymarket affair in
     * Chicago that occurred on 4 May, 1886.
     *
     * @see https://en.wikipedia.org/wiki/International_Workers%27_Day
     *
     * @param int    $year     the year for which International Workers' Day need to be created
     * @param string $timezone the timezone in which International Workers' Day is celebrated
     * @param string $locale   the locale for which International Workers' Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function internationalWorkersDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'internationalWorkersDay',
            [],
            new \DateTime("{$year}-5-1", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * St. Martin's Day.
     *
     * St. Martin's Day, also known as the Feast of St. Martin, Martinstag or Martinmas, the Feast of St Martin of Tours
     * or Martin le Miséricordieux, is a time for feasting celebrations. This is the time when autumn wheat seeding was
     * completed, and the annual slaughter of fattened cattle produced "Martinmas beef". Historically, hiring fairs were
     * held where farm laborers would seek new posts. November 11 is the feast day of St. Martin of Tours, who started
     * out as a Roman soldier.
     *
     * @see https://en.wikipedia.org/wiki/St._Martin%27s_Day
     *
     * @param int    $year     the year for which St. Martin's Day need to be created
     * @param string $timezone the timezone in which St. Martin's Day is celebrated
     * @param string $locale   the locale for which St. Martin's Day need to be displayed in.
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function stMartinsDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'stMartinsDay',
            [],
            new \DateTime("{$year}-11-11", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * International Women's Day.
     *
     * International Women's Day (IWD) is celebrated on March 8 every year.[3] It is a focal point in the movement for women's rights.
     *
     * @see https://en.wikipedia.org/wiki/International_Women%27s_Day
     *
     * @param int    $year     the year for which International Women's Day need to be created
     * @param string $timezone the timezone in which International Women's Day is celebrated
     * @param string $locale   the locale for which International Women's Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function internationalWomensDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'internationalWomensDay',
            [],
            new \DateTime("{$year}-03-08", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * New Year's Eve.
     *
     * New Year's Eve is observed on December 31, the last day of the year on the modern Gregorian calendar as well as
     * the Julian calendar. In present day, with most countries now using the Gregorian calendar as their de facto
     * calendar, New Year's Eve is probably the most celebrated holiday, often observed with fireworks at the stroke of
     * midnight as the new year starts in each time zone.
     *
     * @see https://en.wikipedia.org/wiki/New_Year%27s_Eve
     *
     * @param int    $year     the year for which New Year's Eve need to be created
     * @param string $timezone the timezone in which New Year's Eve is celebrated
     * @param string $locale   the locale for which New Year's Eve need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function newYearsEve(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday('newYearsEve', [], new \DateTime("{$year}-12-31", DateTimeZoneFactory::getDateTimeZone($timezone)), $locale, $type);
    }

    /**
     * Valentine's Day.
     *
     * Valentine's Day, also known as Saint Valentine's Day or the Feast of Saint Valentine, is a celebration observed
     * on February 14 each year. It is celebrated in many countries around the world, although it is not a public
     * holiday in most of them. In 18th-century England, it evolved into an occasion in which lovers expressed their
     * love for each other by presenting flowers, offering confectionery, and sending greeting cards (known as
     * "valentines").
     *
     * @see https://en.wikipedia.org/wiki/Valentine%27s_Day
     *
     * @param int    $year     the year for which Valentine's Day need to be created
     * @param string $timezone the timezone in which Valentine's Day is celebrated
     * @param string $locale   the locale for which Valentine's Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function valentinesDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'valentinesDay',
            [],
            new \DateTime("{$year}-2-14", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * World Animal Day.
     *
     * World Animal Day is an international day of action for animal rights and welfare celebrated annually on October
     * 4, the Feast Day of St Francis of Assisi, the patron saint of animals. It started in 1931 at a convention of
     * ecologists in Florence, Italy who wished to highlight the plight of endangered species.
     *
     * @see https://en.wikipedia.org/wiki/World_Animal_Day
     *
     * @param int    $year     the year for which World Animal Day need to be created
     * @param string $timezone the timezone in which World Animal Day is celebrated
     * @param string $locale   the locale for which World Animal Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function worldAnimalDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'worldAnimalDay',
            [],
            new \DateTime("{$year}-10-4", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * Father's Day.
     *
     * Father's Day is a celebration honoring fathers and celebrating fatherhood, paternal bonds, and the influence of
     * fathers in society. Many countries celebrate it on the third Sunday of June, though it is also celebrated widely
     * on other days by many other countries. Father's Day was created to complement Mother's Day, a celebration that
     * honors mothers and motherhood.
     *
     * @see https://en.wikipedia.org/wiki/Father%27s_Day
     *
     * @param int    $year     the year for which Father's Day need to be created
     * @param string $timezone the timezone in which Father's Day is celebrated
     * @param string $locale   the locale for which Father's Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function fathersDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'fathersDay',
            [],
            new \DateTime("third sunday of june {$year}", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * Mother's Day.
     *
     * Mother's Day is a modern celebration honoring one's own mother, as well as motherhood, maternal bonds, and the
     * influence of mothers in society. It is celebrated on various days in many parts of the world, most commonly in
     * the months of March or May. It complements similar celebrations honoring family members, such as Father's Day and
     * Siblings Day.
     *
     * @see https://en.wikipedia.org/wiki/Mother%27s_Day
     *
     * @param int    $year     the year for which Mother's Day need to be created
     * @param string $timezone the timezone in which Mother's Day is celebrated
     * @param string $locale   the locale for which Mother's Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function mothersDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'mothersDay',
            [],
            new \DateTime("second sunday of may {$year}", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * Victory in Europe Day.
     *
     * Victory in Europe Day, generally known as V-E Day, VE Day, or simply V Day was the public holiday celebrated on 8
     * May 1945 (7 May in Commonwealth realms) to mark the formal acceptance by the Allies of World War II of Nazi
     * Germany's unconditional surrender of its armed forces. It thus marked the end of World War II in Europe. Some
     * countries commemorate the end of the war on a different date.
     *
     * @see https://en.wikipedia.org/wiki/Victory_in_Europe_Day
     *
     * @param int    $year     the year for which Victory in Europe Day need to be created
     * @param string $timezone the timezone in which Victory in Europe Day is celebrated
     * @param string $locale   the locale for which Victory in Europe Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function victoryInEuropeDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'victoryInEuropeDay',
            [],
            new \DateTime("{$year}-5-8", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * Armistice Day.
     *
     * Armistice Day is commemorated every year on 11 November to mark the armistice signed between the Allies of World
     * War I and Germany at Compiègne, France, for the cessation of hostilities on the Western Front of World War I.
     * The date was declared a national holiday in many allied nations, to commemorate those members of the armed forces
     * who were killed during war. An exception is Italy, where the end of the war is commemorated on 4 November, the
     * day of the Armistice of Villa Giusti. In the Netherlands, Denmark and Norway World War I is not commemorated as
     * the three countries all remained neutral.
     *
     * @see https://en.wikipedia.org/wiki/Armistice_Day
     *
     * @param int    $year     the year for which Armistice Day need to be created
     * @param string $timezone the timezone in which Armistice Day is celebrated
     * @param string $locale   the locale for which Armistice Day need to be displayed in
     * @param string $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                         TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws UnknownLocaleException
     * @throws \InvalidArgumentException
     * @throws \Exception
     */
    protected function armisticeDay(
        int $year,
        string $timezone,
        string $locale,
        string $type = Holiday::TYPE_OFFICIAL,
    ): Holiday {
        return new Holiday(
            'armisticeDay',
            [],
            new \DateTime("{$year}-11-11", DateTimeZoneFactory::getDateTimeZone($timezone)),
            $locale,
            $type
        );
    }

    /**
     * The beginning of summer time.
     *
     * Summer time is also known as daylight save time.
     *
     * @param int         $year     the year for which summer time need to be created
     * @param string      $timezone the timezone in which summer time transition occurs
     * @param string      $locale   the locale for which summer time need to be displayed in
     * @param string|null $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                              TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws \Exception
     */
    protected function summerTime(
        int $year,
        string $timezone,
        string $locale,
        ?string $type = null,
    ): ?Holiday {
        $date = $this->calculateSummerWinterTime($year, $timezone, true);

        if ($date instanceof \DateTimeImmutable) {
            return new Holiday(
                'summerTime',
                [],
                $date,
                $locale,
                $type ?? Holiday::TYPE_SEASON
            );
        }

        return null;
    }

    /**
     * The beginning of winter time.
     *
     * Winter time is also known as standard time.
     *
     * @param int         $year     the year for which summer time need to be created
     * @param string      $timezone the timezone in which summer time transition occurs
     * @param string      $locale   the locale for which summer time need to be displayed in
     * @param string|null $type     The type of holiday. Use the following constants: TYPE_OFFICIAL, TYPE_OBSERVANCE,
     *                              TYPE_SEASON, TYPE_BANK or TYPE_OTHER. By default an official holiday is considered.
     *
     * @throws \Exception
     */
    protected function winterTime(
        int $year,
        string $timezone,
        string $locale,
        ?string $type = null,
    ): ?Holiday {
        $date = $this->calculateSummerWinterTime($year, $timezone, false);

        if ($date instanceof \DateTimeImmutable) {
            return new Holiday(
                'winterTime',
                [],
                $date,
                $locale,
                $type ?? Holiday::TYPE_SEASON
            );
        }

        return null;
    }

    /**
     * Calculates daylight saving time transitions.
     *
     * Daylight saving time is the practice of advancing clocks by one hour during summer months so evening daylight
     * lasts even longer, while sacrificing normal sunrise times.
     *
     * The date of transition between standard time and daylight saving time differs from country to country and
     * sometimes from year to year. Most countries outside Europe and North America do not observe daylight saving
     * time.
     *
     * On the northern hemisphere, summer time starts around March/April. On the southern hemisphere it happens 6
     * months later.
     *
     * @param int    $year     the year for which Easter needs to be calculated
     * @param string $timezone the timezone in which Easter is celebrated
     * @param bool   $summer   whether to calculate the start of summer or winter time
     *
     * @return \DateTimeImmutable|null A DateTime object representing the summer or winter transition time for the given
     *                                 timezone. If no transition time is found, a null value is returned.
     *
     * @throws \Exception
     */
    private function calculateSummerWinterTime(
        int $year,
        string $timezone,
        bool $summer,
    ): ?\DateTimeImmutable {
        $zone = DateTimeZoneFactory::getDateTimeZone($timezone);

        $tsBegin = strtotime(sprintf('%u-01-01 00:00:00', $year));
        if (false === $tsBegin) {
            throw new \RuntimeException(sprintf('unable to create a beginning timestamp for the year `%u`', $year));
        }

        $tsEnd = strtotime(sprintf('%u-12-31 23:59:59', $year));
        if (false === $tsEnd) {
            throw new \RuntimeException(sprintf('unable to create an ending timestamp for the year `%u`', $year));
        }

        $transitions = $zone->getTransitions($tsBegin, $tsEnd);

        $transition = array_shift($transitions);
        if (! is_array($transition)) {
            throw new \RuntimeException('unable to get transition details');
        }

        $dst = $transition['isdst'];

        foreach ($transitions as $transition) {
            if ($transition['isdst'] !== $dst && $transition['isdst'] === $summer) {
                return new \DateTimeImmutable(substr($transition['time'], 0, 10), $zone);
            }
            $dst = $transition['isdst'];
        }

        return null;
    }
}
