<?php

class WCML_Mix_and_Match_Products{

    function __construct(){
        add_action( 'updated_post_meta', array( $this, 'sync_mnm_data'), 10, 4 );
    }

    function sync_mnm_data( $meta_id, $post_id, $meta_key, $meta_value  ){

        if( $meta_key != '_mnm_data' )
            return false;

        global $sitepress, $woocommerce_wpml;

        $post = get_post( $post_id );

        // skip auto-drafts // skip autosave
        if ( $post->post_status == 'auto-draft' || isset( $_POST[ 'autosave' ] ) ) {
            return;
        }

        if( $post->post_type == 'product' ) {

            remove_action( 'updated_post_meta', array( $this, 'sync_mnm_data'), 10, 4 );

            if ( $woocommerce_wpml->products->is_original_product( $post_id ) ) {

                $original_product_id = $post_id;

            } else {

                $original_product_id = $this->woocommerce_wpml->products->get_original_product_id( $post_id );

            }

            $mnm_data = maybe_unserialize( get_post_meta( $original_product_id, '_mnm_data', true ) );
            $product_trid = $sitepress->get_element_trid( $original_product_id, 'post_product' );
            $product_translations = $sitepress->get_element_translations( $product_trid, 'post_product' );

            foreach ( $product_translations as $product_translation ) {

                if (empty($product_translation->original)) {

                    foreach ($mnm_data as $key => $mnm_element) {

                        $trnsl_prod = apply_filters( 'translate_object_id', $key, 'product', true, $product_translation->language_code );
                        $mnm_element['product_id'] = $trnsl_prod;
                        $mnm_data[ $trnsl_prod ] = $mnm_element;
                        unset( $mnm_data[$key]);
                    }

                    update_post_meta($product_translation->element_id, '_mnm_data', $mnm_data);

                }

            }

            add_action( 'updated_post_meta', array( $this, 'sync_mnm_data'), 10, 4 );

        }

    }


}