Inventory_Presser_Addon

	abstract class Inventory_Presser_Addon {
		/**
		 * initialize_updater
		 *
		 * @param  string $class_name    The class name in the add-on plugin's main file that contains the VERSION and LICENSE_ITEM constants
		 * @param  string $plugin_path   The file path to the plugin for which we are checking for updates
		 * @param  string $license_key   The license key provided by inventorypresser.com upon purchase
		 * @param  string $include_betas Set to true if you wish customers to receive update notifications of beta releases
		 * @return void
		 */
		public static function initialize_updater( $class_name, $plugin_path, $license_key, $include_betas = false ) {
			//check for existence of updater class
			if ( ! class_exists('Inventory_Presser_Addon_Updater' ) ) {
				return;
			}

			//Does the plugin class have the VERSION and LICENSE_ITEM constants?
			if ( empty( $class_name::VERSION ) || empty( $class_name::LICENSE_ITEM ) ) {
				return;
			} 

			$updater = new Inventory_Presser_Addon_Updater(
				'https://inventorypresser.com',
				$plugin_path,
				array(
					'version' => $class_name::VERSION, //current version number
					'license' => $license_key,
					'item_id' => $class_name::LICENSE_ITEM, //id of this download in inventorypresser.com
					'author'  => 'Corey Salzano',
					'url'     => home_url(), //the site requesting the update, this site
					'beta'    => $include_betas
				) 
			);
		}
		
		/**
		 * add_license_key_box
		 *
		 * @param  mixed $option_name
		 * @param  mixed $settings_section
		 * @param  mixed $sanitize_values_hook_name
		 * @param  mixed $license_key_key_name
		 * @return void
		 */
		public static function add_license_key_box( $option_name, $settings_section, $sanitize_values_hook_name, $license_key_key_name = 'license_key' )
		{
			add_action(
				'admin_init', function () use ( $option_name, $settings_section, $license_key_key_name ) {

					//is $settings_section an existing section?
					global $wp_settings_sections;
					if ( empty( $wp_settings_sections[INVP::option_page()][$settings_section] ) ) {
						//no, abort
						return;
					}

					$option = get_option( $option_name );
					$current_value = empty( $option[$license_key_key_name] ) ? '' : $option[$license_key_key_name];

					add_settings_field(
						$license_key_key_name, // id
						__( 'License key', 'inventory-presser' ), // title
						function () use ( $option_name, $current_value, $license_key_key_name ) {
							?><p><input type="text" name="<?php echo $option_name; ?>[<?php echo $license_key_key_name; ?>]" class="regular-text code" id="<?php echo $option_name; ?>[<?php echo $license_key_key_name; ?>]" value="<?php echo $current_value; ?>" /></p>
							<p class="description"><?php printf('%s <a href="https://inventorypresser.com/">https://inventorypresser.com/</a> %s', __('Obtain a key at', 'inventory-presser'), __('to receive plugin updates.', 'inventory-presser')); ?></p><?php
						}, // callback
						INVP::option_page(), // page
						$settings_section // section
					);
				}, 20 
			);

			$hook_parameters_count = 'license_key' == $license_key_key_name ? 3 : 4;
			add_filter( $sanitize_values_hook_name, array( __CLASS__, 'sanitize_and_activate_license_key' ), 10, $hook_parameters_count );
		}
		
		/**
		 * make_sure_license_is_activated
		 *
		 * @param  mixed $license_item
		 * @param  mixed $license_key
		 * @return void
		 */
		public static function make_sure_license_is_activated( $license_item, $license_key )
		{
			$license = new Inventory_Presser_Addon_License(
				$license_key,
				$license_item
			);
			if( ! $license->is_active() ) {
				$license->activate(); 
			}
		}
				
		/**
		 * sanitize_and_activate_license_key
		 *
		 * @param  mixed $sanitized
		 * @param  mixed $input
		 * @param  mixed $license_item
		 * @param  mixed $license_key_key_name
		 * @return void
		 */
		public static function sanitize_and_activate_license_key( $sanitized, $input, $license_item, $license_key_key_name = 'license_key' ) {
			if ( isset( $input[$license_key_key_name] ) ) {
				$sanitized[$license_key_key_name] = sanitize_text_field( $input[$license_key_key_name] );
				self::make_sure_license_is_activated( $license_item, $sanitized[$license_key_key_name] );
			}
			return $sanitized;
		}
	}