<?php



#[AllowDynamicProperties]
class WP_Locale_Switcher {
	
	private $stack = array();

	
	private $original_locale;

	
	private $available_languages;

	
	public function __construct() {
		$this->original_locale     = determine_locale();
		$this->available_languages = array_merge( array( 'en_US' ), get_available_languages() );
	}

	
	public function init() {
		add_filter( 'locale', array( $this, 'filter_locale' ) );
		add_filter( 'determine_locale', array( $this, 'filter_locale' ) );
	}

	
	public function switch_to_locale( $locale, $user_id = false ) {
		$current_locale = determine_locale();
		if ( $current_locale === $locale ) {
			return false;
		}

		if ( ! in_array( $locale, $this->available_languages, true ) ) {
			return false;
		}

		$this->stack[] = array( $locale, $user_id );

		$this->change_locale( $locale );

		
		do_action( 'switch_locale', $locale, $user_id );

		return true;
	}

	
	public function switch_to_user_locale( $user_id ) {
		$locale = get_user_locale( $user_id );
		return $this->switch_to_locale( $locale, $user_id );
	}

	
	public function restore_previous_locale() {
		$previous_locale = array_pop( $this->stack );

		if ( null === $previous_locale ) {
			// The stack is empty, bail.
			return false;
		}

		$entry  = end( $this->stack );
		$locale = is_array( $entry ) ? $entry[0] : false;

		if ( ! $locale ) {
			// There's nothing left in the stack: go back to the original locale.
			$locale = $this->original_locale;
		}

		$this->change_locale( $locale );

		
		do_action( 'restore_previous_locale', $locale, $previous_locale[0] );

		return $locale;
	}

	
	public function restore_current_locale() {
		if ( empty( $this->stack ) ) {
			return false;
		}

		$this->stack = array( array( $this->original_locale, false ) );

		return $this->restore_previous_locale();
	}

	
	public function is_switched() {
		return ! empty( $this->stack );
	}

	
	public function get_switched_locale() {
		$entry = end( $this->stack );

		if ( $entry ) {
			return $entry[0];
		}

		return false;
	}

	
	public function get_switched_user_id() {
		$entry = end( $this->stack );

		if ( $entry ) {
			return $entry[1];
		}

		return false;
	}

	
	public function filter_locale( $locale ) {
		$switched_locale = $this->get_switched_locale();

		if ( $switched_locale ) {
			return $switched_locale;
		}

		return $locale;
	}

	
	private function load_translations( $locale ) {
		global $l10n;

		$domains = $l10n ? array_keys( $l10n ) : array();

		load_default_textdomain( $locale );

		foreach ( $domains as $domain ) {
			// The default text domain is handled by `load_default_textdomain()`.
			if ( 'default' === $domain ) {
				continue;
			}

			/*
			 * Unload current text domain but allow them to be reloaded
			 * after switching back or to another locale.
			 */
			unload_textdomain( $domain, true );
			get_translations_for_domain( $domain );
		}
	}

	
	private function change_locale( $locale ) {
		global $wp_locale, $phpmailer;

		$this->load_translations( $locale );

		$wp_locale = new WP_Locale();

		WP_Translation_Controller::get_instance()->set_locale( $locale );

		if ( $phpmailer instanceof WP_PHPMailer ) {
			$phpmailer->SetLanguage();
		}

		
		do_action( 'change_locale', $locale );
	}
}