<?php
/**
 * Multilingual sites: Polylang and WPML.
 *
 * @package AriConsent
 */

namespace AriConsent;

defined( 'ABSPATH' ) || exit;

/**
 * Makes everything the site owner types (banner texts, cookie purposes of custom services) translatable
 * per language, and points the privacy policy link at the page in the visitor's language.
 * Texts left blank need nothing: they come from AriConsent's own translations in the active language.
 */
final class Multilingual {

	/**
	 * Group name shown in the translation plugin's string list.
	 */
	const CONTEXT = 'AriConsent';

	/**
	 * Hooks.
	 */
	public static function register() {
		// Polylang keeps no list of strings: it must be told about them on every admin page load.
		add_action( 'admin_init', array( self::class, 'register_polylang_strings' ) );
		// WPML stores strings, so it only needs to hear about them when they change.
		add_action( 'add_option_' . Settings::OPTION, array( self::class, 'register_wpml_strings' ) );
		add_action( 'update_option_' . Settings::OPTION, array( self::class, 'register_wpml_strings' ) );
	}

	/**
	 * Which translation plugin is active.
	 *
	 * @return string 'polylang', 'wpml' or ''.
	 */
	public static function plugin() {
		if ( function_exists( 'pll_register_string' ) && function_exists( 'pll__' ) ) {
			return 'polylang';
		}
		if ( defined( 'ICL_SITEPRESS_VERSION' ) ) {
			return 'wpml';
		}
		return '';
	}

	/**
	 * Owner-entered strings that visitors see, keyed by a stable name.
	 *
	 * @param array<string, mixed> $settings Settings.
	 * @return array<string, string> Name => text.
	 */
	public static function strings( array $settings ) {
		$out = array();
		foreach ( $settings['texts'] as $key => $value ) {
			if ( '' !== trim( (string) $value, " \t\n\r\0\x0B\f" ) ) {
				$out[ 'text_' . $key ] = (string) $value;
			}
		}
		foreach ( $settings['custom_services'] as $service ) {
			foreach ( $service['cookies'] as $i => $cookie ) {
				if ( '' !== trim( (string) $cookie[1], " \t\n\r\0\x0B\f" ) ) {
					$out[ 'cookie_' . $service['id'] . '_' . $i . '_duration' ] = (string) $cookie[1];
				}
				if ( '' !== trim( (string) $cookie[2], " \t\n\r\0\x0B\f" ) ) {
					$out[ 'cookie_' . $service['id'] . '_' . $i ] = (string) $cookie[2];
				}
			}
		}
		return $out;
	}

	/**
	 * Lists the strings in Polylang's Languages > Translations screen.
	 */
	public static function register_polylang_strings() {
		if ( 'polylang' !== self::plugin() ) {
			return;
		}
		foreach ( self::strings( Settings::get() ) as $name => $value ) {
			pll_register_string( $name, $value, self::CONTEXT, 'text_message' === $name );
		}
	}

	/**
	 * Sends the strings to WPML String Translation.
	 */
	public static function register_wpml_strings() {
		if ( 'wpml' !== self::plugin() ) {
			return;
		}
		Settings::flush();
		foreach ( self::strings( Settings::get() ) as $name => $value ) {
			do_action( 'wpml_register_single_string', self::CONTEXT, $name, $value ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- WPML's own hook.
		}
	}

	/**
	 * A string in the current language, or as typed when there is no translation.
	 *
	 * @param string $name  Name from strings().
	 * @param string $value Text as typed by the owner.
	 * @return string
	 */
	public static function translate( $name, $value ) {
		$plugin = self::plugin();
		if ( 'polylang' === $plugin ) {
			$value = pll__( $value );
		} elseif ( 'wpml' === $plugin ) {
			$value = (string) apply_filters( 'wpml_translate_single_string', $value, self::CONTEXT, $name ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- WPML's own hook.
		}

		/**
		 * Filters an owner-entered string before visitors see it, for other translation plugins.
		 *
		 * @param string $value Text.
		 * @param string $name  Stable name, such as text_title or cookie_custom-chat_0.
		 */
		return (string) apply_filters( 'ariconsent_translate_string', $value, $name );
	}

	/**
	 * The privacy policy URL in the current language.
	 *
	 * @param array<string, mixed> $settings Settings.
	 * @return string Empty when there is no policy page.
	 */
	public static function privacy_url( array $settings ) {
		$page = (int) $settings['privacy_page'];
		if ( ! $page ) {
			return (string) get_privacy_policy_url();
		}
		$plugin = self::plugin();
		if ( 'polylang' === $plugin && function_exists( 'pll_get_post' ) ) {
			$translated = (int) pll_get_post( $page );
			$page       = $translated ? $translated : $page;
		} elseif ( 'wpml' === $plugin ) {
			$page = (int) apply_filters( 'wpml_object_id', $page, 'page', true ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- WPML's own hook.
		}
		$url = get_permalink( $page );
		return $url ? (string) $url : '';
	}
}