<?php

namespace Falang\Core;

/**
 * Manages strings translations storage
 *
 * @since 1.2
 * @since 2.1 Stores the strings in a post meta instead of post content to avoid unserialize issues (See Polylang #63)
 */

class Falang_Mo extends \MO {

	/**
	 * Registers the falang_mo custom post type, only at first object creation
	 *
	 * @since 1.2
     * @update 1.3.65 fix _load_textdomain_just_in_time warning thanks to Alexandre Froger
	 */
	public function __construct() {
		//TODO put here or on Falang install
		if ( ! post_type_exists( 'falang_mo' ) ) {
			//$labels = array( 'name' => __( 'String translations', 'falang' ) );
			//register_post_type( 'falang_mo', array( 'labels' => $labels, 'rewrite' => false, 'query_var' => false, '_falang' => true ) );
            if ( ! has_action( 'init', array( __CLASS__, 'initialize_post_type' ) ) ) {
                add_action( 'init', array( __CLASS__, 'initialize_post_type' ) );
            }
		}
	}

    /**
     * init post type use for fixing _load_textdomain_just_in_time
     *
     * @since 1.3.65
     */
    public static function initialize_post_type() {
        $labels = array( 'name' => __( 'String translations', 'falang' ) );
        register_post_type( 'falang_mo', array( 'labels' => $labels, 'rewrite' => false, 'query_var' => false, '_falang' => true ) );
    }

	/**
	 * Returns the post id of the post storing the strings translations
	 *
	 * @since 1.0
     * @since 1.3.10 get language string from cache if exist
	 *
	 * @param object $lang
	 * @return int
	 */
	public static function get_id( $lang ) {
		global $wpdb;

        $ids = wp_cache_get( 'falang_mo_ids' );

		if ( empty( $ids ) ) {
			$ids = $wpdb->get_results( "SELECT post_title, ID FROM $wpdb->posts WHERE post_type='falang_mo'", OBJECT_K );
			wp_cache_add( 'falang_mo_ids', $ids );
		}

		// The mo id for a language can be transiently empty
		return isset( $ids[ 'falang_mo_' . $lang->term_id ] ) ? $ids[ 'falang_mo_' . $lang->term_id ]->ID : null;
	}

	/**
	 * Reads a FALANG_MO object from a custom post meta
	 *
	 * @since 1.2
	 *
	 * @param object $lang The language in which we want to get strings
	 */
	public function import_from_db( $lang ) {
		if ( ! empty( $lang->mo_id ) ) {
			$strings = get_post_meta( $lang->mo_id, '_falang_strings_translations', true );
			if ( is_array( $strings ) ) {
				foreach ( $strings as $msg ) {
					$this->add_entry( $this->make_entry( $msg[0], $msg[1] ) );
				}
			}
		}
	}


	/**
	 * Writes a FALANG_MO object into a custom post meta
	 *
	 * @since 1.2
	 *
	 * @param object $lang The language in which we want to export strings
	 */
	public function export_to_db( $lang ) {
		$this->add_entry( $this->make_entry( '', '' ) ); // Empty string translation, just in case

		// Would be convenient to store the whole object but it would take a huge space in DB
		// So let's keep only the strings in an array
		$strings = array();
		foreach ( $this->entries as $entry ) {
			$strings[] = array( $entry->singular, $this->translate( $entry->singular ) );
		}

		$strings = wp_slash( $strings ); // Avoid breaking slashed strings in update_post_meta. See https://codex.wordpress.org/Function_Reference/update_post_meta#Character_Escaping

		if ( empty( $lang->mo_id ) ) {
			$post = array(
				'post_title'  => 'falang_mo_' . $lang->term_id,
				'post_status' => 'private', // To avoid a conflict with WP Super Cache. See https://wordpress.org/support/topic/polylang_mo-and-404s-take-2
				'post_type'   => 'falang_mo',
			);
			$mo_id = wp_insert_post( $post );
			update_post_meta( $mo_id, '_falang_strings_translations', $strings );
		} else {
			update_post_meta( $lang->mo_id, '_falang_strings_translations', $strings );
		}
	}

	/**
	 * Invalidate the cache when adding a new language
	 *
	 * @since 2.0.5
	 */
	public function clean_cache() {
		wp_cache_delete( 'falang_mo_ids' );
	}

    /**
     * Deletes a string
     *
     * @since 1.3.13
     *
     * @param string $string The source string to remove from the translations.
     * @return void
     */
    public function delete_entry( $string ) {
        unset( $this->entries[ $string ] );
    }

}