<?php
/**
 * Commerce Product Resource Sync
 *
 * Syncs all the attached Commerce TV product's target field to point
 * to the resource that it was saved from for quick linking to the resource.
 *
 * NOTE: Using this sync, products can only belong to one resource to link back to.
 */

switch ($modx->event->name) {
    case 'OnDocFormSave':
        // Replace products with the TV name
        $productsTV = $resource->getTVValue('products');
        if (!$productsTV) {
            return;
        }

        // Load Commerce, required to get the model for comProduct
        $path = $modx->getOption('commerce.core_path', null, MODX_CORE_PATH . 'components/commerce/') . 'model/commerce/';
        $params = ['mode' => $modx->getOption('commerce.mode')];
        $commerce = $modx->getService('commerce', 'Commerce', $path, $params);

        // Since product ids are stored as a comma seperated list in the TV, we can
        // extract it into an array to easily manipulate each product
        $productIds = explode(',', $productsTV);

        foreach ($productIds as $productId) {
            $product = $modx->getObject('comProduct', $productId);
            // Make sure product hasn't been removed externally
            if (!$product) {
                continue;
            }
            // Set the target referring back to the modResource id.
            $product->set('target', $id);
            $product->save();
        }

        break;
}