<?php
/**
 * Bundled translations as a fallback for language packs.
 *
 * @package ThreeDoor
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Picks the bundled .mo file for a locale.
 */
class ThreeDoor_I18n {

	/**
	 * Bundled languages: language code => locale of the bundled file.
	 *
	 * @var array
	 */
	private static $bundled = array(
		'de' => 'de_DE',
		'es' => 'es_ES',
		'fr' => 'fr_FR',
		'it' => 'it_IT',
	);

	/**
	 * Register the loader.
	 *
	 * @return void
	 */
	public static function init() {
		add_action( 'init', array( __CLASS__, 'load' ), 0 );
	}

	/**
	 * Load the bundled file for the current locale, if any.
	 *
	 * @return void
	 */
	public static function load() {
		$file = self::bundled_file( determine_locale() );
		if ( '' !== $file ) {
			load_textdomain( '3task-doorman', $file );
		}
	}

	/**
	 * The bundled file for a locale, or an empty string when a language pack from
	 * translate.wordpress.org is installed or no bundled file fits.
	 *
	 * de_AT and de_CH use de_DE, formal German uses de_DE_formal, es_MX uses es_ES and so on.
	 *
	 * @param string $locale Locale.
	 * @return string
	 */
	public static function bundled_file( $locale ) {
		$locale = (string) $locale;
		if ( file_exists( WP_LANG_DIR . '/plugins/3task-doorman-' . $locale . '.mo' ) ) {
			return '';
		}
		$dir   = THREEDOOR_DIR . 'languages/3task-doorman-';
		$exact = $dir . $locale . '.mo';
		if ( file_exists( $exact ) ) {
			return $exact;
		}
		$language = strtolower( substr( $locale, 0, 2 ) );
		if ( ! isset( self::$bundled[ $language ] ) ) {
			return '';
		}
		$fallback = self::$bundled[ $language ];
		if ( 'de' === $language && false !== strpos( $locale, '_formal' ) ) {
			$fallback = 'de_DE_formal';
		}
		$file = $dir . $fallback . '.mo';
		return file_exists( $file ) ? $file : '';
	}
}