<?php
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * return 'true', if no update needed,
 * or 'false', if update is impossible to do,
 * or 0, if all languages were updated successfully,
 * or positive integer number of errors occurred on languages update.
 */
function qtranxf_update_gettext_databases_ex( bool $force = false, string $only_for_language = '' ) {
    global $q_config;

    if ( $only_for_language && ! qtranxf_isEnabled( $only_for_language ) ) {
        return false;
    }

    if ( ! is_dir( WP_LANG_DIR ) ) {
        if ( ! @mkdir( WP_LANG_DIR ) ) {
            return false;
        }
    }

    if ( ! $only_for_language ) {
        $next_update = get_option( 'qtranslate_next_update_mo' );
        if ( time() < $next_update && ! $force ) {
            return true;
        }
        update_option( 'qtranslate_next_update_mo', strtotime( '+7days' ) );
    }

    require_once ABSPATH . 'wp-admin/includes/translation-install.php';
    require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
    require_once ABSPATH . 'wp-admin/includes/file.php';
    $wp_version = '';
    include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version - TODO not sure why we need this?!
    $result = translations_api( 'core', array( 'version' => $wp_version ) );

    if ( is_wp_error( $result ) ) {
        qtranxf_add_warning( __( 'Gettext databases <strong>not</strong> updated:', 'qtranslate' ) . ' ' . $result->get_error_message() );

        return false;
    }

    set_time_limit( 300 );

    $langs   = empty( $only_for_language ) ? $q_config['enabled_languages'] : array( $only_for_language );
    $locales = $q_config['locale'];
    $errcnt  = 0;
    foreach ( $result['translations'] as $translation ) {
        $locale = $translation['language'];
        $lang   = null;
        foreach ( $langs as $lng ) {
            if ( ! isset( $locales[ $lng ] ) ) {
                $locales = qtranxf_language_configured( 'locale' );
                if ( ! isset( $locales[ $lng ] ) ) {
                    continue;
                }
            }
            if ( $locales[ $lng ] != $locale ) {
                continue;
            }
            $lang = $lng;
            break;
        }
        if ( ! $lang ) {
            continue;
        }

        $translation       = (object) $translation;
        $skin              = new Automatic_Upgrader_Skin;
        $upgrader          = new Language_Pack_Upgrader( $skin );
        $translation->type = 'core';
        $res               = $upgrader->upgrade( $translation, array( 'clear_update_cache' => false ) );

        if ( is_wp_error( $res ) ) {
            qtranxf_add_warning( sprintf( __( 'Failed to update gettext database for "%s": %s', 'qtranslate' ), $q_config['language_name'][ $lang ], $res->get_error_message() ) );
            ++$errcnt;
        }
    }

    return $errcnt;
}