<?php

namespace RoosterLMS\Core;

defined( 'ABSPATH' ) || exit;

final class Clock {

	private static ?int $frozen = null;

	private static ?int $frozen_ms = null;

	public static function now(): string {
		return gmdate( 'Y-m-d H:i:s', self::timestamp() );
	}

	public static function timestamp(): int {
		return self::$frozen ?? time();
	}

	public static function milliseconds(): int {
		if ( null !== self::$frozen_ms ) {
			return self::$frozen_ms;
		}
		if ( null !== self::$frozen ) {
			return self::$frozen * 1000;
		}
		return (int) floor( microtime( true ) * 1000 );
	}

	public static function ms_datetime( int $ms ): string {
		$seconds = intdiv( $ms, 1000 );
		$rest    = $ms - $seconds * 1000;
		if ( $rest < 0 ) {
			--$seconds;
			$rest += 1000;
		}
		return gmdate( 'Y-m-d H:i:s', $seconds ) . '.' . str_pad( (string) $rest, 3, '0', STR_PAD_LEFT );
	}

	public static function datetime_ms( ?string $value ): ?int {
		if ( null === $value || '' === $value ) {
			return null;
		}
		$parts   = explode( '.', $value, 2 );
		$seconds = strtotime( $parts[0] . ' UTC' );
		if ( false === $seconds ) {
			return null;
		}
		$fraction = isset( $parts[1] ) ? (int) str_pad( substr( preg_replace( '/\D/', '', $parts[1] ), 0, 3 ), 3, '0' ) : 0;
		return $seconds * 1000 + $fraction;
	}

	public static function site_today(): string {
		return wp_date( 'Y-m-d', self::timestamp(), wp_timezone() );
	}

	public static function org_today( int $org_id ): string {
		$zone = wp_timezone();
		if ( $org_id > 0 ) {
			$org = \RoosterLMS\Domain\Services::org_repo()->get( $org_id );
			if ( null !== $org && '' !== $org->timezone ) {
				try {
					$zone = new \DateTimeZone( $org->timezone );
				} catch ( \Exception $e ) {
					unset( $e );
				}
			}
		}
		return wp_date( 'Y-m-d', self::timestamp(), $zone );
	}

	public static function freeze( ?int $timestamp ): void {
		self::$frozen    = $timestamp;
		self::$frozen_ms = null;
	}

	public static function freeze_ms( ?int $ms ): void {
		self::$frozen_ms = $ms;
		self::$frozen    = null === $ms ? null : intdiv( $ms, 1000 );
	}
}