From e89258b799d6d9efc7217823fd230361f73439ef Mon Sep 17 00:00:00 2001
From: Tamara Zuk <tamarazuk@gmail.com>
Date: Sat, 21 Nov 2020 02:36:40 -0500
Subject: [PATCH] Update WooCommerce version check to use WC_Version constant -
 closes #19

---
 woocommerce-product-sku-generator.php | 86 ++++++++++++++++++++++-----
 1 file changed, 70 insertions(+), 16 deletions(-)

diff --git a/woocommerce-product-sku-generator.php b/woocommerce-product-sku-generator.php
index 5f0eeb5..d68a69a 100644
--- a/woocommerce-product-sku-generator.php
+++ b/woocommerce-product-sku-generator.php
@@ -24,15 +24,11 @@
 
 defined( 'ABSPATH' ) or exit;
 
-// WC version check
-if ( ! WC_SKU_Generator::is_plugin_active('woocommerce.php' ) || version_compare( get_option( 'woocommerce_db_version' ), WC_SKU_Generator::MIN_WOOCOMMERCE_VERSION, '<' ) ) {
-	add_action( 'admin_notices', array( 'WC_SKU_Generator', 'render_outdated_wc_version_notice' ) );
+// check if WooCommerce is active
+if ( ! WC_SKU_Generator::is_plugin_active( 'woocommerce.php' ) ) {
 	return;
 }
 
-// Make sure we're loaded after WC and fire it up!
-add_action( 'plugins_loaded', 'wc_sku_generator' );
-
 
 /**
  * Class WC_SKU_Generator
@@ -61,35 +57,52 @@ class WC_SKU_Generator {
 	 */
 	public function __construct() {
 
+		// initialize the plugin
+		add_action( 'plugins_loaded', [ $this, 'initialize' ] );
+
 		// load translations
-		add_action( 'init', array( $this, 'load_translation' ) );
+		add_action( 'init', [ $this, 'load_translation' ] );
+	}
+
+	/**
+	 * Initializes the plugin, bailing if any required conditions are not met,
+	 * including minimum WooCommerce version.
+	 *
+	 * @since 2.4.6-dev.1
+	 */
+	public function initialize() {
+
+		if ( ! $this->is_minimum_wc_version_met() ) {
+			// halt functionality
+			return;
+		}
 
 		if ( is_admin() ) {
 
 			// disable variation SKUs when generated
-			add_action( 'woocommerce_product_write_panel_tabs', array( $this, 'maybe_disable_variation_skus' ), 10, 2 );
+			add_action( 'woocommerce_product_write_panel_tabs', [ $this, 'maybe_disable_variation_skus' ], 10, 2 );
 
 			// generate SKUs when variations are saved via ajax
-			add_action( 'woocommerce_ajax_save_product_variations', array( $this, 'ajax_maybe_generate_variation_skus' ) );
+			add_action( 'woocommerce_ajax_save_product_variations', [ $this, 'ajax_maybe_generate_variation_skus' ] );
 		}
 
 		if ( is_admin() && ! is_ajax() ) {
 
 			// add settings
-			add_filter( 'woocommerce_products_general_settings', array( $this, 'add_settings' ) );
-			add_action( 'admin_print_scripts',                   array( $this, 'admin_js' ) );
+			add_filter( 'woocommerce_products_general_settings', [ $this, 'add_settings' ] );
+			add_action( 'admin_print_scripts',                   [ $this, 'admin_js' ] );
 
 			// add plugin links
-			add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), array( $this, 'add_plugin_links' ) );
+			add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), [ $this, 'add_plugin_links' ] );
 
 			// save the generated SKUs during product edit / bulk edit
-			add_action( 'woocommerce_product_bulk_edit_save', array( $this, 'maybe_save_sku' ) );
-			add_action( 'woocommerce_process_product_meta',   array( $this, 'maybe_save_sku' ), 100, 2 );
+			add_action( 'woocommerce_product_bulk_edit_save', [ $this, 'maybe_save_sku' ] );
+			add_action( 'woocommerce_process_product_meta',   [ $this, 'maybe_save_sku' ], 100, 2 );
 
-			add_action( 'woocommerce_save_product_variation', array( $this, 'maybe_save_varation_sku' ) );
+			add_action( 'woocommerce_save_product_variation', [ $this, 'maybe_save_varation_sku' ] );
 
 			// disable SKU fields when being generated by the plugin
-			add_action( 'init', array( $this, 'maybe_disable_skus' ) );
+			add_action( 'init', [ $this, 'maybe_disable_skus' ] );
 
 			// run every time
 			$this->install();
@@ -207,6 +220,43 @@ public static function is_plugin_active( $plugin_name ) {
 	}
 
 
+	/**
+	 * Returns the currently installed version of WooCommerce.
+	 *
+	 * @since 2.4.6-dev.1
+	 * @return string/null The WooCommerce version number or null.
+	 */
+	private static function get_wc_version() {
+		return defined( 'WC_VERSION' ) && WC_VERSION ? WC_VERSION : null;
+	}
+
+
+	/**
+	 * Determines if the minimum WooCommerce version is met.
+	 *
+	 * @since 2.4.6-dev.1
+	 * @return boolean true if the required version is met, false otherwise
+	 */
+	private function is_minimum_wc_version_met() {
+
+		$version_met = true;
+
+		// if a plugin defines a minimum WC version, render a notice and skip loading the plugin
+		if ( defined( 'self::MIN_WOOCOMMERCE_VERSION' ) && version_compare( self::get_wc_version(), self::MIN_WOOCOMMERCE_VERSION, '<' ) ) {
+
+			if ( is_admin() && ! is_ajax() && ! has_action( 'admin_notices', [ $this, 'render_outdated_wc_version_notice' ] ) ) {
+
+				add_action( 'admin_notices', [ $this, 'render_outdated_wc_version_notice' ] );
+			}
+
+			$version_met = false;
+		}
+
+		return $version_met;
+	}
+
+
+
 	/**
 	 * Renders a notice when WooCommerce version is outdated.
 	 *
@@ -782,3 +832,7 @@ private function upgrade( $installed_version ) {
 function wc_sku_generator() {
 	return WC_SKU_Generator::instance();
 }
+
+
+// fire it up!
+wc_sku_generator();