File woocommerce-delivery-notes.php | WooCommerce Print Invoice & Delivery Note

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<?php
/**
 * Print invoices & delivery notes for WooCommerce orders.
 *
 * Plugin Name: WooCommerce Print Invoice & Delivery Note
 * Plugin URI: https://www.tychesoftwares.com/
 * Description: Print Invoices & Delivery Notes for WooCommerce Orders. 
 * Version: 4.4.1
 * Author: Tyche Softwares
 * Author URI: https://www.tychesoftwares.com/
 * License: GPLv3 or later
 * License URI: http://www.opensource.org/licenses/gpl-license.php
 * Text Domain: woocommerce-delivery-notes
 * Domain Path: /languages
 * Requires PHP: 5.6
 * WC requires at least: 3.0.0
 * WC tested up to: 3.2.0
 *
 * Copyright 2015 Tyche Softwares
 *      
 *     This file is part of WooCommerce Print Invoices & Delivery Notes,
 *     a plugin for WordPress.
 *
 *     WooCommerce Print Invoice & Delivery Note is free software:
 *     You can redistribute it and/or modify it under the terms of the
 *     GNU General Public License as published by the Free Software
 *     Foundation, either version 2 of the License, or (at your option)
 *     any later version.
 *
 *     WooCommerce Print Invoice & Delivery Note is distributed in the hope that
 *     it will be useful, but WITHOUT ANY WARRANTY; without even the
 *     implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *     PURPOSE. See the GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with WordPress. If not, see <http://www.gnu.org/licenses/>.
 */


/**
 * Exit if accessed directly
 */
if ( !defined( 'ABSPATH' ) ) {
    exit; 
}

/**
 * Base class
 */
if ( !class_exists( 'WooCommerce_Delivery_Notes' ) ) {
    /**
     * WooCommerce Delivery Notes
     * 
     * @author Tyche Softwares
     * @package WooCommerce-Delivery-Notes
     */
    final class WooCommerce_Delivery_Notes {
 
        /**
         * The single instance of the class
         */
        protected static $_instance = null;
    
        /**
         * Default properties
         */
        public static $plugin_version = '4.4';
        public static $plugin_url;
        public static $plugin_path;
        public static $plugin_basefile;
        public static $plugin_basefile_path;
        public static $plugin_text_domain;
        
        /**
         * Sub class instances
         */
        public $writepanel;
        public $settings;
        public $print;
        public $theme;

        /**
         * Main Instance
         */
        public static function instance() {
            if( is_null( self::$_instance ) ) {
                self::$_instance = new self();
            }
            return self::$_instance;
        }
    
        /**
         * Cloning is forbidden
         */
        public function __clone() {
            _doing_it_wrong( __FUNCTION__, __( 'Cheatin&#8217; huh?', 'woocommerce-delivery-notes' ), '4.1' );
        }
    
        /**
         * Unserializing instances of this class is forbidden
         */
        public function __wakeup() {
            _doing_it_wrong( __FUNCTION__, __( 'Cheatin&#8217; huh?', 'woocommerce-delivery-notes' ), '4.1' );
        }

        /**
         * Constructor
         */
        public function __construct() {
            $this->define_constants();
            $this->init_hooks();
            
            // Send out the load action
            do_action( 'wcdn_load');
        }

        /**
         * Hook into actions and filters
         */
        public function init_hooks() {
            add_action( 'init', array( $this, 'localise' ) );
            add_action( 'woocommerce_init', array( $this, 'load' ) );
        }

        /**
         * Define WC Constants
         */
        private function define_constants() {
            self::$plugin_basefile_path = __FILE__;
            self::$plugin_basefile = plugin_basename( self::$plugin_basefile_path );
            self::$plugin_url = plugin_dir_url( self::$plugin_basefile );
            self::$plugin_path = trailingslashit( dirname( self::$plugin_basefile_path ) ); 
            self::$plugin_text_domain = trim( dirname( self::$plugin_basefile ) );      
        }
        
        /**
         * Define constant if not already set
         */
        private function define( $name, $value ) {

            if( !defined( $name ) ) {
                define( $name, $value );
            }
        }
        
        /**
         * Include the main plugin classes and functions
         */
        public function include_classes() {
            include_once( 'includes/class-wcdn-print.php' );
            include_once( 'includes/class-wcdn-settings.php' );
            include_once( 'includes/class-wcdn-writepanel.php' );
            include_once( 'includes/class-wcdn-theme.php' );
            if ( is_admin() ) {
                include_once( 'includes/wcdn-welcome.php' );
            }
        }

        /**
         * Function used to init Template Functions.
         * This makes them pluggable by plugins and themes.
         */
        public function include_template_functions() {
            include_once( 'includes/wcdn-template-functions.php' );
            include_once( 'includes/wcdn-template-hooks.php' );
        }
        
        /**
         * Load the localisation 
         */
        public function localise() {                            
            // Load language files from the wp-content/languages/plugins folder
            $mo_file = WP_LANG_DIR . '/plugins/' . self::$plugin_text_domain . '-' . get_locale() . '.mo';
            if( is_readable( $mo_file ) ) {
                load_textdomain( self::$plugin_text_domain, $mo_file );
            }

            // Otherwise load them from the plugin folder
            load_plugin_textdomain( self::$plugin_text_domain, false, dirname( self::$plugin_basefile ) . '/languages/' );
        }
        
        /**
         * Load the main plugin classes and functions
         */
        public function load() {
            // WooCommerce activation required
            if ( $this->is_woocommerce_activated() ) {  
                // Include the classes  
                $this->include_classes();
                            
                // Create the instances
                $this->print = new WooCommerce_Delivery_Notes_Print();
                $this->settings = new WooCommerce_Delivery_Notes_Settings();
                $this->writepanel = new WooCommerce_Delivery_Notes_Writepanel();
                $this->theme = new WooCommerce_Delivery_Notes_Theme();

                // Load the hooks for the template after the objetcs.
                // Like this the template has full access to all objects.
                add_filter( 'plugin_action_links_' . self::$plugin_basefile, array( $this, 'add_settings_link') );
                add_action( 'admin_init', array( $this, 'update' ) );
                add_action( 'init', array( $this, 'include_template_functions' ) );
                
                // Send out the init action
                do_action( 'wcdn_init');
            }
        }
                
        /**
         * Install or update the default settings
         */
        public function update() {
            $option_version = get_option( 'wcdn_version', '1' );

            // Update the settings
            if( version_compare( $option_version, self::$plugin_version, '<' ) ) {
                // Legacy updates
                if( version_compare( $option_version, '4.2.0', '<' ) ) {
                    // Group invoice numbering
                    $invoice_start = intval( get_option( 'wcdn_invoice_number_start', 1 ) );
                    $invoice_counter = intval( get_option( 'wcdn_invoice_number_counter', 0 ) );
                    update_option( 'wcdn_invoice_number_count', $invoice_start + $invoice_counter );    
                    
                    // Translate checkbox values
                    foreach( $this->settings->get_settings() as $value ) {
                        if( isset( $value['id'] ) && isset( $value['type'] ) && $value['type'] == 'checkbox' ) {
                            $autoload = isset( $value['autoload'] ) ? (bool) $value['autoload'] : true;
                            $option = get_option( $value['id'] );
                            if( (bool)$option ) {
                                update_option( $value['id'], 'yes' );   
                            } else {
                                update_option( $value['id'], 'no' );    
                            }
                        }
                    }               
                }
                
                // Set all options that have default values
                foreach( $this->settings->get_settings() as $value ) {
                    if( isset( $value['default'] ) && isset( $value['id'] ) ) {
                        $autoload = isset( $value['autoload'] ) ? (bool) $value['autoload'] : true;
                        add_option( $value['id'], $value['default'], '', ( $autoload ? 'yes' : 'no' ) );
                    }
                }
                
                // Flush the transients in case the endpoint changed
                set_transient( 'wcdn_flush_rewrite_rules', true );

                // Update the settings to the latest version
                update_option( 'wcdn_version', self::$plugin_version );
            }
        }
        
        /**
         * Add settings link to plugin page
         */
        public function add_settings_link( $links ) {
            $url = esc_url( admin_url( add_query_arg( array( 'page' => 'wc-settings', 'tab' => $this->settings->id ), 'admin.php' ) ) );
            $settings = sprintf( '<a href="%s" title="%s">%s</a>' , $url, __( 'Go to the settings page', 'woocommerce-delivery-notes' ) , __( 'Settings', 'woocommerce-delivery-notes' ) );
            array_unshift( $links, $settings );
            return $links;  
        }
                
        /**
         * Check if woocommerce is activated
         */
        public function is_woocommerce_activated() {
            $blog_plugins = get_option( 'active_plugins', array() );
            $site_plugins = get_site_option( 'active_sitewide_plugins', array() );
            $woocommerce_basename = plugin_basename( WC_PLUGIN_FILE );
                    
            if( ( in_array( $woocommerce_basename, $blog_plugins ) || isset( $site_plugins[$woocommerce_basename] ) ) && version_compare( WC_VERSION, '2.2', '>=' ) ) {
                return true;
            } else {
                return false;
            }
        }
        
    }
}

/**
 * Returns the main instance of the plugin to prevent the need to use globals
 */
function WCDN() {
    return WooCommerce_Delivery_Notes::instance();
}

/**
 * Global for backwards compatibility
 */
$GLOBALS['wcdn'] = WCDN();

?>

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