<?php
namespace Advently\Calendar;

defined( 'ABSPATH' ) || exit;

/**
 * The stored calendar (option advently_calendar) and the site clock.
 */
final class Option {

	const NAME = 'advently_calendar';

	public static function get(): array {
		$raw = get_option( self::NAME, [] );
		return self::sanitize( is_array( $raw ) ? $raw : [] );
	}

	/**
	 * Config::sanitize() with the coupon kinds and keys that add-ons register.
	 */
	public static function sanitize( array $raw, ?int $year = null ): array {
		/**
		 * Filters the coupon kinds a door can hand out. The first one is the default.
		 *
		 * @param string[] $kinds Coupon kinds.
		 */
		$kinds = (array) apply_filters( 'advently_coupon_kinds', Config::COUPON_KINDS );
		$clean = Config::sanitize( $raw, $year ?? self::year(), $kinds );
		/**
		 * Filters the sanitised calendar config, so add-ons can keep their own keys.
		 *
		 * @param array $clean Sanitised config.
		 * @param array $raw   Config as submitted or stored.
		 */
		return (array) apply_filters( 'advently_sanitize_config', $clean, $raw );
	}

	/**
	 * Whether the owner has saved a calendar yet (the wizard runs until then).
	 */
	public static function exists(): bool {
		return is_array( get_option( self::NAME, null ) );
	}

	/**
	 * Sanitises, stores and returns the config that was actually saved.
	 */
	public static function save( array $raw ): array {
		$config = self::sanitize( $raw );
		update_option( self::NAME, $config, false );
		return $config;
	}

	public static function schedule( array $config ): Schedule {
		return new Schedule( $config['start'], $config['doors'], wp_timezone() );
	}

	/**
	 * "Now" in the site's timezone. The filter exists for the demo site, which
	 * shows December on any day of the year; the plugin never uses it itself.
	 */
	public static function now(): \DateTimeImmutable {
		$now = new \DateTimeImmutable( 'now', wp_timezone() );
		/**
		 * Filters the moment the calendar treats as "now".
		 *
		 * @param \DateTimeImmutable $now Current time in the site's timezone.
		 */
		$filtered = apply_filters( 'advently_now', $now );
		return $filtered instanceof \DateTimeImmutable ? $filtered : $now;
	}

	/**
	 * Year of the default start date (1 December) when nothing is saved yet.
	 */
	private static function year(): int {
		$now = new \DateTimeImmutable( 'now', wp_timezone() );
		return (int) $now->format( 'Y' );
	}
}