<?php
/**
 * Languages offered in the "Add language" dropdown, and the mapping from a
 * WordPress locale to a language.
 */

declare( strict_types = 1 );

namespace AddBlack\Lang\Language;

defined( 'ABSPATH' ) || exit;

final class LanguagePresets {

	private const PRESETS = array(
		'en' => array( 'English', 'en_US', '🇬🇧', false ),
		'uk' => array( 'Українська', 'uk', '🇺🇦', false ),
		'pl' => array( 'Polski', 'pl_PL', '🇵🇱', false ),
		'de' => array( 'Deutsch', 'de_DE', '🇩🇪', false ),
		'fr' => array( 'Français', 'fr_FR', '🇫🇷', false ),
		'es' => array( 'Español', 'es_ES', '🇪🇸', false ),
		'it' => array( 'Italiano', 'it_IT', '🇮🇹', false ),
		'pt' => array( 'Português', 'pt_PT', '🇵🇹', false ),
		'nl' => array( 'Nederlands', 'nl_NL', '🇳🇱', false ),
		'cs' => array( 'Čeština', 'cs_CZ', '🇨🇿', false ),
		'ro' => array( 'Română', 'ro_RO', '🇷🇴', false ),
		'tr' => array( 'Türkçe', 'tr_TR', '🇹🇷', false ),
		'ja' => array( '日本語', 'ja', '🇯🇵', false ),
		'zh' => array( '中文', 'zh_CN', '🇨🇳', false ),
		'ar' => array( 'العربية', 'ar', '🇸🇦', true ),
		'he' => array( 'עברית', 'he_IL', '🇮🇱', true ),
	);

	/** @return array<string, Language> code => language */
	public function all(): array {
		$out = array();
		foreach ( array_keys( self::PRESETS ) as $code ) {
			$out[ $code ] = $this->make( $code );
		}
		return $out;
	}

	public function get( string $code ): ?Language {
		return isset( self::PRESETS[ $code ] ) ? $this->make( $code ) : null;
	}

	/**
	 * Language for a WordPress locale: the preset with that locale, else the
	 * preset for its language part (de_AT -> Deutsch with locale de_AT), else
	 * a generic entry named after the locale.
	 */
	public function from_locale( string $locale, bool $rtl = false ): Language {
		$locale = '' !== $locale ? $locale : 'en_US';
		foreach ( self::PRESETS as $code => $p ) {
			if ( $p[1] === $locale ) {
				return $this->make( $code );
			}
		}
		$code   = strtolower( (string) preg_replace( '/[^a-z]/i', '', (string) strtok( $locale, '_-' ) ) );
		$code   = '' === $code ? 'en' : $code;
		$preset = $this->get( $code );
		if ( $preset ) {
			return new Language( $code, $code, $preset->name, $locale, $preset->flag, $preset->rtl );
		}
		return new Language( $code, $code, $locale, $locale, '', $rtl );
	}

	private function make( string $code ): Language {
		list( $name, $locale, $flag, $rtl ) = self::PRESETS[ $code ];
		return new Language( $code, $code, $name, $locale, $flag, $rtl );
	}
}