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<?php
/*
Plugin Name: LearnDash - Integration with Aelia Currency Switcher (PROOF OF CONCEPT)
Plugin URI: https://aelia.co/
Description: This plugin tries to pass the LearnDash "course" product to the Aelia Currency Switcher for conversion.
Version: 1.0.0
Author: Aelia
Author URI: https://aelia.co
License: GPLv3
*/
 
/**
 * GPL DISCLAIMER
 * Except when otherwise stated in writing the copyright holders and/or other parties provide the program "as is"
 * without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose. The entire risk as to the quality and performance of the program
 * is with you. should the program prove defective, you assume the cost of all necessary servicing, repair or correction.
 */
 
/**
 * == Changelog ==
 *
 * = 1.0.0 =
 * First release, 04 April 2022.
 */
 
/**
 * Experimental integration with LearnDash. This plugin tries to pass the LearnDash "course" product to
 * the Aelia Currency Switcher for conversion.
 *
 * IMPORTANT
 * This plugin is to be intended as the proof of concept to show the LeadnDash developer how they could easily
 * implement a basic integration  with the Aelia Currency Switcher. It's not meant to be a guarnatee of compatibility,
 * and we cannot provide any support for it.
 */
class WC_LearnDash_Aelia_Currency_Switcher_Integration {
    /**
     * The singleton instance of this class.
     *
     * @var WC_LearnDash_Aelia_Currency_Switcher_Integration
     */
    protected static $_instance;
 
    /**
     * The product type used by LearnDash.
     *
     * @var string
     */
    const PRODUCT_TYPE = 'course';
 
    /**
     * The text domain used by the plugin.
     *
     * @var string
     */
    protected static $text_domain = 'wc-aelia-learndash-integration';
 
    /**
     * The instance of the Pricing Manager used by the Aelia Currency Switcher.
     *
     * @var object
     */
    protected $pricing_manager;
 
    /**
     * Returns the singleton instance of this class.
     *
     * @return WC_LearnDash_Aelia_Currency_Switcher_Integration
     */
    public static function instance(): WC_LearnDash_Aelia_Currency_Switcher_Integration {
        return static::$_instance ?? static::$_instance = new static();
    }
 
  /**
     * Constructor.
     */
    public function __construct() {
        $this->set_hooks();
    }
 
    /**
     * Returns the instance of the Aelia Currency Switcher.
     *
     * @return object|false The plugin instance, or false if the plugin is not
     * active.
     */
    protected function cs() {
        if(!is_object($GLOBALS['woocommerce-aelia-currencyswitcher'])) {
            return false;
        }
        return $GLOBALS['woocommerce-aelia-currencyswitcher'];
    }
 
 
  /**
   * Sets all actions and filters used by the plugin.
   */
    protected function set_hooks() {
        add_action('init', array($this, 'init'), 10);
    }
 
    /**
     * Performs actions when all plugins have been loaded.
     */
    public function init() {
        // Load the plugin's text domain, to allow localisation
        load_plugin_textdomain(self::$text_domain, false, dirname(plugin_basename(__FILE__)) . '/languages/');
 
        // We can only run our custom code if the Currency Switcher is active
        if($this->cs() !== false) {
            $this->pricing_manager = $this->cs()->currencyprices_manager();
 
            add_filter('wc_aelia_currencyswitcher_product_convert_callback', array($this, 'wc_aelia_currencyswitcher_product_convert_callback'), 10, 2);
            add_action('woocommerce_process_product_meta_' . self::PRODUCT_TYPE, array($this, 'woocommerce_process_product_meta'));
        }
    }
 
    /**
     * Event handler fired when a Product is being saved. It processes and saves
     * the Currency Prices associated with the Product.
     *
     * @param int post_id The ID of the Post (product) being saved.
     */
    public function woocommerce_process_product_meta($post_id) {
        $this->pricing_manager->process_product_meta($post_id);
    }
 
    /**
     * Alter the callbacks used by the Currency Switcher, replacing the callback
     * for a "course" type with a custom one.
     *
     * @param callable convert_callback The original callback.
     * @param WC_Product product The callback being converted.
     * @return callable The callback that will convert the product's prices.
     */
    public function wc_aelia_currencyswitcher_product_convert_callback($convert_callback, $product) {
        if($product->is_type(self::PRODUCT_TYPE)) {
            $convert_callback = array($this, 'convert_product_prices');
        }
 
        return $convert_callback;
    }
 
    /**
     * Converts the prices of a "course" product.
     *
     * IMPORTANT
     * This method assumes that a "course" is just another simple product. If that's not the case, the
     * conversion may not work as expected. In that case, the best course of action would be for the
     * authors of LearnDash to add native multi-currency support to their plugin.
     *
     * @param WC_Product product The product whose prices will be converted.
     * @param string currency The target currency.
     * @return WC_Product The product, with the prices converted to the target
     * currency.
     */
    public function convert_product_prices(WC_Product $product, $currency) {
        $product = $this->pricing_manager->convert_simple_product_prices($product, $currency);
 
        return $product;
    }
}
 
WC_LearnDash_Aelia_Currency_Switcher_Integration::instance();