<?php
/**
 * Installation related functions and actions.
 *
 * @author   WooThemes
 * @category Admin
 * @package  WooCommerce/Classes
 * @version  3.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * WC_Install Class.
 */
class WC_Install {

	/** @var array DB updates and callbacks that need to be run per version */
	private static $db_updates = array(
		'2.0.0' => array(
			'wc_update_200_file_paths',
			'wc_update_200_permalinks',
			'wc_update_200_subcat_display',
			'wc_update_200_taxrates',
			'wc_update_200_line_items',
			'wc_update_200_images',
			'wc_update_200_db_version',
		),
		'2.0.9' => array(
			'wc_update_209_brazillian_state',
			'wc_update_209_db_version',
		),
		'2.1.0' => array(
			'wc_update_210_remove_pages',
			'wc_update_210_file_paths',
			'wc_update_210_db_version',
		),
		'2.2.0' => array(
			'wc_update_220_shipping',
			'wc_update_220_order_status',
			'wc_update_220_variations',
			'wc_update_220_attributes',
			'wc_update_220_db_version',
		),
		'2.3.0' => array(
			'wc_update_230_options',
			'wc_update_230_db_version',
		),
		'2.4.0' => array(
			'wc_update_240_options',
			'wc_update_240_shipping_methods',
			'wc_update_240_api_keys',
			'wc_update_240_webhooks',
			'wc_update_240_refunds',
			'wc_update_240_db_version',
		),
		'2.4.1' => array(
			'wc_update_241_variations',
			'wc_update_241_db_version',
		),
		'2.5.0' => array(
			'wc_update_250_currency',
			'wc_update_250_db_version',
		),
		'2.6.0' => array(
			'wc_update_260_options',
			'wc_update_260_termmeta',
			'wc_update_260_zones',
			'wc_update_260_zone_methods',
			'wc_update_260_refunds',
			'wc_update_260_db_version',
		),
		'3.0.0' => array(
			'wc_update_300_webhooks',
			'wc_update_300_grouped_products',
			'wc_update_300_settings',
			'wc_update_300_product_visibility',
			'wc_update_300_db_version',
		),
		'3.1.0' => array(
			'wc_update_310_downloadable_products',
			'wc_update_310_old_comments',
			'wc_update_310_db_version',
		),
		'3.1.2' => array(
			'wc_update_312_shop_manager_capabilities',
			'wc_update_312_db_version',
		),
		'3.2.0' => array(
			'wc_update_320_mexican_states',
			'wc_update_320_db_version',
		),
	);

	/** @var object Background update class */
	private static $background_updater;

	/**
	 * Hook in tabs.
	 */
	public static function init() {
		add_action( 'init', array( __CLASS__, 'check_version' ), 5 );
		add_action( 'init', array( __CLASS__, 'init_background_updater' ), 5 );
		add_action( 'admin_init', array( __CLASS__, 'install_actions' ) );
		add_action( 'in_plugin_update_message-woocommerce/woocommerce.php', array( __CLASS__, 'in_plugin_update_message' ) );
		add_filter( 'plugin_action_links_' . WC_PLUGIN_BASENAME, array( __CLASS__, 'plugin_action_links' ) );
		add_filter( 'plugin_row_meta', array( __CLASS__, 'plugin_row_meta' ), 10, 2 );
		add_filter( 'wpmu_drop_tables', array( __CLASS__, 'wpmu_drop_tables' ) );
		add_filter( 'cron_schedules', array( __CLASS__, 'cron_schedules' ) );
		add_action( 'woocommerce_plugin_background_installer', array( __CLASS__, 'background_installer' ), 10, 2 );
		add_action( 'woocommerce_theme_background_installer', array( __CLASS__, 'theme_background_installer' ), 10, 1 );
	}

	/**
	 * Init background updates
	 */
	public static function init_background_updater() {
		include_once( dirname( __FILE__ ) . '/class-wc-background-updater.php' );
		self::$background_updater = new WC_Background_Updater();
	}

	/**
	 * Check WooCommerce version and run the updater is required.
	 *
	 * This check is done on all requests and runs if the versions do not match.
	 */
	public static function check_version() {
		if ( ! defined( 'IFRAME_REQUEST' ) && get_option( 'woocommerce_version' ) !== WC()->version ) {
			self::install();
			do_action( 'woocommerce_updated' );
		}
	}

	/**
	 * Install actions when a update button is clicked within the admin area.
	 *
	 * This function is hooked into admin_init to affect admin only.
	 */
	public static function install_actions() {
		if ( ! empty( $_GET['do_update_woocommerce'] ) ) {
			self::update();
			WC_Admin_Notices::add_notice( 'update' );
		}
		if ( ! empty( $_GET['force_update_woocommerce'] ) ) {
			do_action( 'wp_wc_updater_cron' );
			wp_safe_redirect( admin_url( 'admin.php?page=wc-settings' ) );
			exit;
		}
	}

	/**
	 * Install WC.
	 */
	public static function install() {
		global $wpdb;

		if ( ! is_blog_installed() ) {
			return;
		}

		if ( ! defined( 'WC_INSTALLING' ) ) {
			define( 'WC_INSTALLING', true );
		}

		// Ensure needed classes are loaded
		include_once( dirname( __FILE__ ) . '/admin/class-wc-admin-notices.php' );

		self::create_options();
		self::create_tables();
		self::create_roles();

		// Register post types
		WC_Post_types::register_post_types();
		WC_Post_types::register_taxonomies();

		// Also register endpoints - this needs to be done prior to rewrite rule flush
		WC()->query->init_query_vars();
		WC()->query->add_endpoints();
		WC_API::add_endpoint();
		WC_Auth::add_endpoint();

		self::create_terms();
		self::create_cron_jobs();
		self::create_files();

		// Queue upgrades/setup wizard
		$current_wc_version    = get_option( 'woocommerce_version', null );
		$current_db_version    = get_option( 'woocommerce_db_version', null );

		WC_Admin_Notices::remove_all_notices();

		// No versions? This is a new install :)
		if ( is_null( $current_wc_version ) && is_null( $current_db_version ) && apply_filters( 'woocommerce_enable_setup_wizard', true ) ) {
			WC_Admin_Notices::add_notice( 'install' );
			set_transient( '_wc_activation_redirect', 1, 30 );

		// No page? Let user run wizard again..
		} elseif ( ! get_option( 'woocommerce_cart_page_id' ) ) {
			WC_Admin_Notices::add_notice( 'install' );
		}

		if ( ! is_null( $current_db_version ) && version_compare( $current_db_version, max( array_keys( self::$db_updates ) ), '<' ) ) {
			WC_Admin_Notices::add_notice( 'update' );
		} else {
			self::update_db_version();
		}

		self::update_wc_version();

		// Flush rules after install
		do_action( 'woocommerce_flush_rewrite_rules' );
		delete_transient( 'wc_attribute_taxonomies' );

		/*
		 * Deletes all expired transients. The multi-table delete syntax is used
		 * to delete the transient record from table a, and the corresponding
		 * transient_timeout record from table b.
		 *
		 * Based on code inside core's upgrade_network() function.
		 */
		$sql = "DELETE a, b FROM $wpdb->options a, $wpdb->options b
			WHERE a.option_name LIKE %s
			AND a.option_name NOT LIKE %s
			AND b.option_name = CONCAT( '_transient_timeout_', SUBSTRING( a.option_name, 12 ) )
			AND b.option_value < %d";
		$wpdb->query( $wpdb->prepare( $sql, $wpdb->esc_like( '_transient_' ) . '%', $wpdb->esc_like( '_transient_timeout_' ) . '%', time() ) );

		// Trigger action
		do_action( 'woocommerce_installed' );
	}

	/**
	 * Update WC version to current.
	 */
	private static function update_wc_version() {
		delete_option( 'woocommerce_version' );
		add_option( 'woocommerce_version', WC()->version );
	}

	/**
	 * Get list of DB update callbacks.
	 *
	 * @since  3.0.0
	 * @return array
	 */
	public static function get_db_update_callbacks() {
		return self::$db_updates;
	}

	/**
	 * Push all needed DB updates to the queue for processing.
	 */
	private static function update() {
		$current_db_version = get_option( 'woocommerce_db_version' );
		$logger             = wc_get_logger();
		$update_queued      = false;

		foreach ( self::get_db_update_callbacks() as $version => $update_callbacks ) {
			if ( version_compare( $current_db_version, $version, '<' ) ) {
				foreach ( $update_callbacks as $update_callback ) {
					$logger->info(
						sprintf( 'Queuing %s - %s', $version, $update_callback ),
						array( 'source' => 'wc_db_updates' )
					);
					self::$background_updater->push_to_queue( $update_callback );
					$update_queued = true;
				}
			}
		}

		if ( $update_queued ) {
			self::$background_updater->save()->dispatch();
		}
	}

	/**
	 * Update DB version to current.
	 * @param string $version
	 */
	public static function update_db_version( $version = null ) {
		delete_option( 'woocommerce_db_version' );
		add_option( 'woocommerce_db_version', is_null( $version ) ? WC()->version : $version );
	}

	/**
	 * Add more cron schedules.
	 * @param  array $schedules
	 * @return array
	 */
	public static function cron_schedules( $schedules ) {
		$schedules['monthly'] = array(
			'interval' => 2635200,
			'display'  => __( 'Monthly', 'woocommerce' ),
		);
		return $schedules;
	}

	/**
	 * Create cron jobs (clear them first).
	 */
	private static function create_cron_jobs() {
		wp_clear_scheduled_hook( 'woocommerce_scheduled_sales' );
		wp_clear_scheduled_hook( 'woocommerce_cancel_unpaid_orders' );
		wp_clear_scheduled_hook( 'woocommerce_cleanup_sessions' );
		wp_clear_scheduled_hook( 'woocommerce_geoip_updater' );
		wp_clear_scheduled_hook( 'woocommerce_tracker_send_event' );

		$ve = get_option( 'gmt_offset' ) > 0 ? '-' : '+';

		wp_schedule_event( strtotime( '00:00 tomorrow ' . $ve . get_option( 'gmt_offset' ) . ' HOURS' ), 'daily', 'woocommerce_scheduled_sales' );

		$held_duration = get_option( 'woocommerce_hold_stock_minutes', '60' );

		if ( '' != $held_duration ) {
			wp_schedule_single_event( time() + ( absint( $held_duration ) * 60 ), 'woocommerce_cancel_unpaid_orders' );
		}

		wp_schedule_event( time(), 'twicedaily', 'woocommerce_cleanup_sessions' );
		wp_schedule_event( strtotime( 'first tuesday of next month' ), 'monthly', 'woocommerce_geoip_updater' );
		wp_schedule_event( time(), apply_filters( 'woocommerce_tracker_event_recurrence', 'daily' ), 'woocommerce_tracker_send_event' );
	}

	/**
	 * Create pages that the plugin relies on, storing page IDs in variables.
	 */
	public static function create_pages() {
		include_once( dirname( __FILE__ ) . '/admin/wc-admin-functions.php' );

		$pages = apply_filters( 'woocommerce_create_pages', array(
			'shop' => array(
				'name'    => _x( 'shop', 'Page slug', 'woocommerce' ),
				'title'   => _x( 'Shop', 'Page title', 'woocommerce' ),
				'content' => '',
			),
			'cart' => array(
				'name'    => _x( 'cart', 'Page slug', 'woocommerce' ),
				'title'   => _x( 'Cart', 'Page title', 'woocommerce' ),
				'content' => '[' . apply_filters( 'woocommerce_cart_shortcode_tag', 'woocommerce_cart' ) . ']',
			),
			'checkout' => array(
				'name'    => _x( 'checkout', 'Page slug', 'woocommerce' ),
				'title'   => _x( 'Checkout', 'Page title', 'woocommerce' ),
				'content' => '[' . apply_filters( 'woocommerce_checkout_shortcode_tag', 'woocommerce_checkout' ) . ']',
			),
			'myaccount' => array(
				'name'    => _x( 'my-account', 'Page slug', 'woocommerce' ),
				'title'   => _x( 'My account', 'Page title', 'woocommerce' ),
				'content' => '[' . apply_filters( 'woocommerce_my_account_shortcode_tag', 'woocommerce_my_account' ) . ']',
			),
		) );

		foreach ( $pages as $key => $page ) {
			wc_create_page( esc_sql( $page['name'] ), 'woocommerce_' . $key . '_page_id', $page['title'], $page['content'], ! empty( $page['parent'] ) ? wc_get_page_id( $page['parent'] ) : '' );
		}

		delete_transient( 'woocommerce_cache_excluded_uris' );
	}

	/**
	 * Default options.
	 *
	 * Sets up the default options used on the settings page.
	 */
	private static function create_options() {
		// Include settings so that we can run through defaults
		include_once( dirname( __FILE__ ) . '/admin/class-wc-admin-settings.php' );

		$settings = WC_Admin_Settings::get_settings_pages();

		foreach ( $settings as $section ) {
			if ( ! method_exists( $section, 'get_settings' ) ) {
				continue;
			}
			$subsections = array_unique( array_merge( array( '' ), array_keys( $section->get_sections() ) ) );

			foreach ( $subsections as $subsection ) {
				foreach ( $section->get_settings( $subsection ) 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' ) );
					}
				}
			}
		}
	}

	/**
	 * Add the default terms for WC taxonomies - product types and order statuses. Modify this at your own risk.
	 */
	public static function create_terms() {
		$taxonomies = array(
			'product_type' => array(
				'simple',
				'grouped',
				'variable',
				'external',
			),
			'product_visibility' => array(
				'exclude-from-search',
				'exclude-from-catalog',
				'featured',
				'outofstock',
				'rated-1',
				'rated-2',
				'rated-3',
				'rated-4',
				'rated-5',
			),
		);

		foreach ( $taxonomies as $taxonomy => $terms ) {
			foreach ( $terms as $term ) {
				if ( ! get_term_by( 'name', $term, $taxonomy ) ) {
					wp_insert_term( $term, $taxonomy );
				}
			}
		}
	}

	/**
	 * Set up the database tables which the plugin needs to function.
	 *
	 * Tables:
	 *		woocommerce_attribute_taxonomies - Table for storing attribute taxonomies - these are user defined
	 *		woocommerce_termmeta - Term meta table - sadly WordPress does not have termmeta so we need our own
	 *		woocommerce_downloadable_product_permissions - Table for storing user and guest download permissions.
	 *			KEY(order_id, product_id, download_id) used for organizing downloads on the My Account page
	 *		woocommerce_order_items - Order line items are stored in a table to make them easily queryable for reports
	 *		woocommerce_order_itemmeta - Order line item meta is stored in a table for storing extra data.
	 *		woocommerce_tax_rates - Tax Rates are stored inside 2 tables making tax queries simple and efficient.
	 *		woocommerce_tax_rate_locations - Each rate can be applied to more than one postcode/city hence the second table.
	 */
	private static function create_tables() {
		global $wpdb;

		$wpdb->hide_errors();

		require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );

		/**
		 * Before updating with DBDELTA, remove any primary keys which could be
		 * modified due to schema updates.
		 */
		if ( $wpdb->get_var( "SHOW TABLES LIKE '{$wpdb->prefix}woocommerce_downloadable_product_permissions';" ) ) {
			if ( ! $wpdb->get_var( "SHOW COLUMNS FROM `{$wpdb->prefix}woocommerce_downloadable_product_permissions` LIKE 'permission_id';" ) ) {
				$wpdb->query( "ALTER TABLE {$wpdb->prefix}woocommerce_downloadable_product_permissions DROP PRIMARY KEY, ADD `permission_id` BIGINT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT;" );
			}
		}

		dbDelta( self::get_schema() );

		$index_exists = $wpdb->get_row( "SHOW INDEX FROM {$wpdb->comments} WHERE column_name = 'comment_type' and key_name = 'woo_idx_comment_type'" );

		if ( is_null( $index_exists ) ) {
			// Add an index to the field comment_type to improve the response time of the query
			// used by WC_Comments::wp_count_comments() to get the number of comments by type.
			$wpdb->query( "ALTER TABLE {$wpdb->comments} ADD INDEX woo_idx_comment_type (comment_type)" );
		}
	}

	/**
	 * Get Table schema.
	 *
	 * https://github.com/woocommerce/woocommerce/wiki/Database-Description/
	 *
	 * A note on indexes; Indexes have a maximum size of 767 bytes. Historically, we haven't need to be concerned about that.
	 * As of WordPress 4.2, however, we moved to utf8mb4, which uses 4 bytes per character. This means that an index which
	 * used to have room for floor(767/3) = 255 characters, now only has room for floor(767/4) = 191 characters.
	 *
	 * Changing indexes may cause duplicate index notices in logs due to https://core.trac.wordpress.org/ticket/34870 but dropping
	 * indexes first causes too much load on some servers/larger DB.
	 *
	 * @return string
	 */
	private static function get_schema() {
		global $wpdb;

		$collate = '';

		if ( $wpdb->has_cap( 'collation' ) ) {
			$collate = $wpdb->get_charset_collate();
		}

		$tables = "
CREATE TABLE {$wpdb->prefix}woocommerce_sessions (
  session_id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  session_key char(32) NOT NULL,
  session_value longtext NOT NULL,
  session_expiry BIGINT UNSIGNED NOT NULL,
  PRIMARY KEY  (session_key),
  UNIQUE KEY session_id (session_id)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_api_keys (
  key_id BIGINT UNSIGNED NOT NULL auto_increment,
  user_id BIGINT UNSIGNED NOT NULL,
  description varchar(200) NULL,
  permissions varchar(10) NOT NULL,
  consumer_key char(64) NOT NULL,
  consumer_secret char(43) NOT NULL,
  nonces longtext NULL,
  truncated_key char(7) NOT NULL,
  last_access datetime NULL default null,
  PRIMARY KEY  (key_id),
  KEY consumer_key (consumer_key),
  KEY consumer_secret (consumer_secret)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_attribute_taxonomies (
  attribute_id BIGINT UNSIGNED NOT NULL auto_increment,
  attribute_name varchar(200) NOT NULL,
  attribute_label varchar(200) NULL,
  attribute_type varchar(20) NOT NULL,
  attribute_orderby varchar(20) NOT NULL,
  attribute_public int(1) NOT NULL DEFAULT 1,
  PRIMARY KEY  (attribute_id),
  KEY attribute_name (attribute_name(20))
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_downloadable_product_permissions (
  permission_id BIGINT UNSIGNED NOT NULL auto_increment,
  download_id varchar(32) NOT NULL,
  product_id BIGINT UNSIGNED NOT NULL,
  order_id BIGINT UNSIGNED NOT NULL DEFAULT 0,
  order_key varchar(200) NOT NULL,
  user_email varchar(200) NOT NULL,
  user_id BIGINT UNSIGNED NULL,
  downloads_remaining varchar(9) NULL,
  access_granted datetime NOT NULL default '0000-00-00 00:00:00',
  access_expires datetime NULL default null,
  download_count BIGINT UNSIGNED NOT NULL DEFAULT 0,
  PRIMARY KEY  (permission_id),
  KEY download_order_key_product (product_id,order_id,order_key(16),download_id),
  KEY download_order_product (download_id,order_id,product_id),
  KEY order_id (order_id)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_order_items (
  order_item_id BIGINT UNSIGNED NOT NULL auto_increment,
  order_item_name TEXT NOT NULL,
  order_item_type varchar(200) NOT NULL DEFAULT '',
  order_id BIGINT UNSIGNED NOT NULL,
  PRIMARY KEY  (order_item_id),
  KEY order_id (order_id)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_order_itemmeta (
  meta_id BIGINT UNSIGNED NOT NULL auto_increment,
  order_item_id BIGINT UNSIGNED NOT NULL,
  meta_key varchar(255) default NULL,
  meta_value longtext NULL,
  PRIMARY KEY  (meta_id),
  KEY order_item_id (order_item_id),
  KEY meta_key (meta_key(32))
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_tax_rates (
  tax_rate_id BIGINT UNSIGNED NOT NULL auto_increment,
  tax_rate_country varchar(2) NOT NULL DEFAULT '',
  tax_rate_state varchar(200) NOT NULL DEFAULT '',
  tax_rate varchar(8) NOT NULL DEFAULT '',
  tax_rate_name varchar(200) NOT NULL DEFAULT '',
  tax_rate_priority BIGINT UNSIGNED NOT NULL,
  tax_rate_compound int(1) NOT NULL DEFAULT 0,
  tax_rate_shipping int(1) NOT NULL DEFAULT 1,
  tax_rate_order BIGINT UNSIGNED NOT NULL,
  tax_rate_class varchar(200) NOT NULL DEFAULT '',
  PRIMARY KEY  (tax_rate_id),
  KEY tax_rate_country (tax_rate_country),
  KEY tax_rate_state (tax_rate_state(2)),
  KEY tax_rate_class (tax_rate_class(10)),
  KEY tax_rate_priority (tax_rate_priority)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_tax_rate_locations (
  location_id BIGINT UNSIGNED NOT NULL auto_increment,
  location_code varchar(200) NOT NULL,
  tax_rate_id BIGINT UNSIGNED NOT NULL,
  location_type varchar(40) NOT NULL,
  PRIMARY KEY  (location_id),
  KEY tax_rate_id (tax_rate_id),
  KEY location_type_code (location_type(10),location_code(20))
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_shipping_zones (
  zone_id BIGINT UNSIGNED NOT NULL auto_increment,
  zone_name varchar(200) NOT NULL,
  zone_order BIGINT UNSIGNED NOT NULL,
  PRIMARY KEY  (zone_id)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_shipping_zone_locations (
  location_id BIGINT UNSIGNED NOT NULL auto_increment,
  zone_id BIGINT UNSIGNED NOT NULL,
  location_code varchar(200) NOT NULL,
  location_type varchar(40) NOT NULL,
  PRIMARY KEY  (location_id),
  KEY location_id (location_id),
  KEY location_type_code (location_type(10),location_code(20))
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_shipping_zone_methods (
  zone_id BIGINT UNSIGNED NOT NULL,
  instance_id BIGINT UNSIGNED NOT NULL auto_increment,
  method_id varchar(200) NOT NULL,
  method_order BIGINT UNSIGNED NOT NULL,
  is_enabled tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY  (instance_id)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_payment_tokens (
  token_id BIGINT UNSIGNED NOT NULL auto_increment,
  gateway_id varchar(200) NOT NULL,
  token text NOT NULL,
  user_id BIGINT UNSIGNED NOT NULL DEFAULT '0',
  type varchar(200) NOT NULL,
  is_default tinyint(1) NOT NULL DEFAULT '0',
  PRIMARY KEY  (token_id),
  KEY user_id (user_id)
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_payment_tokenmeta (
  meta_id BIGINT UNSIGNED NOT NULL auto_increment,
  payment_token_id BIGINT UNSIGNED NOT NULL,
  meta_key varchar(255) NULL,
  meta_value longtext NULL,
  PRIMARY KEY  (meta_id),
  KEY payment_token_id (payment_token_id),
  KEY meta_key (meta_key(32))
) $collate;
CREATE TABLE {$wpdb->prefix}woocommerce_log (
  log_id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  timestamp datetime NOT NULL,
  level smallint(4) NOT NULL,
  source varchar(200) NOT NULL,
  message longtext NOT NULL,
  context longtext NULL,
  PRIMARY KEY (log_id),
  KEY level (level)
) $collate;
		";

		/**
		 * Term meta is only needed for old installs and is now @deprecated by WordPress term meta.
		 */
		if ( ! function_exists( 'get_term_meta' ) ) {
			$tables .= "
CREATE TABLE {$wpdb->prefix}woocommerce_termmeta (
  meta_id BIGINT UNSIGNED NOT NULL auto_increment,
  woocommerce_term_id BIGINT UNSIGNED NOT NULL,
  meta_key varchar(255) default NULL,
  meta_value longtext NULL,
  PRIMARY KEY  (meta_id),
  KEY woocommerce_term_id (woocommerce_term_id),
  KEY meta_key (meta_key(32))
) $collate;
			";
		}

		return $tables;
	}

	/**
	 * Create roles and capabilities.
	 */
	public static function create_roles() {
		global $wp_roles;

		if ( ! class_exists( 'WP_Roles' ) ) {
			return;
		}

		if ( ! isset( $wp_roles ) ) {
			$wp_roles = new WP_Roles();
		}

		// Customer role
		add_role( 'customer', __( 'Customer', 'woocommerce' ), array(
			'read' 					=> true,
		) );

		// Shop manager role
		add_role( 'shop_manager', __( 'Shop manager', 'woocommerce' ), array(
			'level_9'                => true,
			'level_8'                => true,
			'level_7'                => true,
			'level_6'                => true,
			'level_5'                => true,
			'level_4'                => true,
			'level_3'                => true,
			'level_2'                => true,
			'level_1'                => true,
			'level_0'                => true,
			'read'                   => true,
			'read_private_pages'     => true,
			'read_private_posts'     => true,
			'edit_users'             => true,
			'edit_posts'             => true,
			'edit_pages'             => true,
			'edit_published_posts'   => true,
			'edit_published_pages'   => true,
			'edit_private_pages'     => true,
			'edit_private_posts'     => true,
			'edit_others_posts'      => true,
			'edit_others_pages'      => true,
			'publish_posts'          => true,
			'publish_pages'          => true,
			'delete_posts'           => true,
			'delete_pages'           => true,
			'delete_private_pages'   => true,
			'delete_private_posts'   => true,
			'delete_published_pages' => true,
			'delete_published_posts' => true,
			'delete_others_posts'    => true,
			'delete_others_pages'    => true,
			'manage_categories'      => true,
			'manage_links'           => true,
			'moderate_comments'      => true,
			'upload_files'           => true,
			'export'                 => true,
			'import'                 => true,
			'list_users'             => true,
		) );

		$capabilities = self::get_core_capabilities();

		foreach ( $capabilities as $cap_group ) {
			foreach ( $cap_group as $cap ) {
				$wp_roles->add_cap( 'shop_manager', $cap );
				$wp_roles->add_cap( 'administrator', $cap );
			}
		}
	}

	/**
	 * Get capabilities for WooCommerce - these are assigned to admin/shop manager during installation or reset.
	 *
	 * @return array
	 */
	 private static function get_core_capabilities() {
		$capabilities = array();

		$capabilities['core'] = array(
			'manage_woocommerce',
			'view_woocommerce_reports',
		);

		$capability_types = array( 'product', 'shop_order', 'shop_coupon', 'shop_webhook' );

		foreach ( $capability_types as $capability_type ) {

			$capabilities[ $capability_type ] = array(
				// Post type
				"edit_{$capability_type}",
				"read_{$capability_type}",
				"delete_{$capability_type}",
				"edit_{$capability_type}s",
				"edit_others_{$capability_type}s",
				"publish_{$capability_type}s",
				"read_private_{$capability_type}s",
				"delete_{$capability_type}s",
				"delete_private_{$capability_type}s",
				"delete_published_{$capability_type}s",
				"delete_others_{$capability_type}s",
				"edit_private_{$capability_type}s",
				"edit_published_{$capability_type}s",

				// Terms
				"manage_{$capability_type}_terms",
				"edit_{$capability_type}_terms",
				"delete_{$capability_type}_terms",
				"assign_{$capability_type}_terms",
			);
		}

		return $capabilities;
	}

	/**
	 * woocommerce_remove_roles function.
	 */
	public static function remove_roles() {
		global $wp_roles;

		if ( ! class_exists( 'WP_Roles' ) ) {
			return;
		}

		if ( ! isset( $wp_roles ) ) {
			$wp_roles = new WP_Roles();
		}

		$capabilities = self::get_core_capabilities();

		foreach ( $capabilities as $cap_group ) {
			foreach ( $cap_group as $cap ) {
				$wp_roles->remove_cap( 'shop_manager', $cap );
				$wp_roles->remove_cap( 'administrator', $cap );
			}
		}

		remove_role( 'customer' );
		remove_role( 'shop_manager' );
	}

	/**
	 * Create files/directories.
	 */
	private static function create_files() {
		// Install files and folders for uploading files and prevent hotlinking
		$upload_dir      = wp_upload_dir();
		$download_method = get_option( 'woocommerce_file_download_method', 'force' );

		$files = array(
			array(
				'base' 		=> $upload_dir['basedir'] . '/woocommerce_uploads',
				'file' 		=> 'index.html',
				'content' 	=> '',
			),
			array(
				'base' 		=> WC_LOG_DIR,
				'file' 		=> '.htaccess',
				'content' 	=> 'deny from all',
			),
			array(
				'base' 		=> WC_LOG_DIR,
				'file' 		=> 'index.html',
				'content' 	=> '',
			),
		);

		if ( 'redirect' !== $download_method ) {
			$files[] = array(
				'base' 		=> $upload_dir['basedir'] . '/woocommerce_uploads',
				'file' 		=> '.htaccess',
				'content' 	=> 'deny from all',
			);
		}

		foreach ( $files as $file ) {
			if ( wp_mkdir_p( $file['base'] ) && ! file_exists( trailingslashit( $file['base'] ) . $file['file'] ) ) {
				if ( $file_handle = @fopen( trailingslashit( $file['base'] ) . $file['file'], 'w' ) ) {
					fwrite( $file_handle, $file['content'] );
					fclose( $file_handle );
				}
			}
		}
	}

	/**
	 * Show plugin changes. Code adapted from W3 Total Cache.
	 *
	 * @param array $args
	 */
	public static function in_plugin_update_message( $args ) {
		$transient_name = 'wc_upgrade_notice_' . $args['Version'];

		if ( false === ( $upgrade_notice = get_transient( $transient_name ) ) ) {
			$response = wp_safe_remote_get( 'https://plugins.svn.wordpress.org/woocommerce/trunk/readme.txt' );

			if ( ! is_wp_error( $response ) && ! empty( $response['body'] ) ) {
				$upgrade_notice = self::parse_update_notice( $response['body'], $args['new_version'] );
				set_transient( $transient_name, $upgrade_notice, DAY_IN_SECONDS );
			}
		}

		echo apply_filters( 'woocommerce_in_plugin_update_message', wp_kses_post( $upgrade_notice ) );
	}

	/**
	 * Parse update notice from readme file.
	 *
	 * @param  string $content
	 * @param  string $new_version
	 * @return string
	 */
	private static function parse_update_notice( $content, $new_version ) {
		// Output Upgrade Notice.
		$matches        = null;
		$regexp         = '~==\s*Upgrade Notice\s*==\s*=\s*(.*)\s*=(.*)(=\s*' . preg_quote( WC_VERSION ) . '\s*=|$)~Uis';
		$upgrade_notice = '';

		if ( preg_match( $regexp, $content, $matches ) ) {
			$notices = (array) preg_split( '~[\r\n]+~', trim( $matches[2] ) );

			// Convert the full version strings to minor versions.
			$notice_version_parts  = explode( '.', trim( $matches[1] ) );
			$current_version_parts = explode( '.', WC_VERSION );

			if ( 3 !== sizeof( $notice_version_parts ) ) {
				return;
			}

			$notice_version  = $notice_version_parts[0] . '.' . $notice_version_parts[1];
			$current_version = $current_version_parts[0] . '.' . $current_version_parts[1];

			// Check the latest stable version and ignore trunk.
			if ( version_compare( $current_version, $notice_version, '<' ) ) {

				$upgrade_notice .= '</p><p class="wc_plugin_upgrade_notice">';

				foreach ( $notices as $index => $line ) {
					$upgrade_notice .= preg_replace( '~\[([^\]]*)\]\(([^\)]*)\)~', '<a href="${2}">${1}</a>', $line );
				}
			}
		}

		return wp_kses_post( $upgrade_notice );
	}

	/**
	 * Show action links on the plugin screen.
	 *
	 * @param	mixed $links Plugin Action links
	 * @return	array
	 */
	public static function plugin_action_links( $links ) {
		$action_links = array(
			'settings' => '<a href="' . admin_url( 'admin.php?page=wc-settings' ) . '" aria-label="' . esc_attr__( 'View WooCommerce settings', 'woocommerce' ) . '">' . esc_html__( 'Settings', 'woocommerce' ) . '</a>',
		);

		return array_merge( $action_links, $links );
	}

	/**
	 * Show row meta on the plugin screen.
	 *
	 * @param	mixed $links Plugin Row Meta
	 * @param	mixed $file  Plugin Base file
	 * @return	array
	 */
	public static function plugin_row_meta( $links, $file ) {
		if ( WC_PLUGIN_BASENAME == $file ) {
			$row_meta = array(
				'docs'    => '<a href="' . esc_url( apply_filters( 'woocommerce_docs_url', 'https://docs.woocommerce.com/documentation/plugins/woocommerce/' ) ) . '" aria-label="' . esc_attr__( 'View WooCommerce documentation', 'woocommerce' ) . '">' . esc_html__( 'Docs', 'woocommerce' ) . '</a>',
				'apidocs' => '<a href="' . esc_url( apply_filters( 'woocommerce_apidocs_url', 'https://docs.woocommerce.com/wc-apidocs/' ) ) . '" aria-label="' . esc_attr__( 'View WooCommerce API docs', 'woocommerce' ) . '">' . esc_html__( 'API docs', 'woocommerce' ) . '</a>',
				'support' => '<a href="' . esc_url( apply_filters( 'woocommerce_support_url', 'https://woocommerce.com/my-account/tickets/' ) ) . '" aria-label="' . esc_attr__( 'Visit premium customer support', 'woocommerce' ) . '">' . esc_html__( 'Premium support', 'woocommerce' ) . '</a>',
			);

			return array_merge( $links, $row_meta );
		}

		return (array) $links;
	}

	/**
	 * Uninstall tables when MU blog is deleted.
	 * @param  array $tables
	 * @return string[]
	 */
	public static function wpmu_drop_tables( $tables ) {
		global $wpdb;

		$tables[] = $wpdb->prefix . 'woocommerce_sessions';
		$tables[] = $wpdb->prefix . 'woocommerce_api_keys';
		$tables[] = $wpdb->prefix . 'woocommerce_attribute_taxonomies';
		$tables[] = $wpdb->prefix . 'woocommerce_downloadable_product_permissions';
		$tables[] = $wpdb->prefix . 'woocommerce_termmeta';
		$tables[] = $wpdb->prefix . 'woocommerce_tax_rates';
		$tables[] = $wpdb->prefix . 'woocommerce_tax_rate_locations';
		$tables[] = $wpdb->prefix . 'woocommerce_order_items';
		$tables[] = $wpdb->prefix . 'woocommerce_order_itemmeta';
		$tables[] = $wpdb->prefix . 'woocommerce_payment_tokens';
		$tables[] = $wpdb->prefix . 'woocommerce_shipping_zones';
		$tables[] = $wpdb->prefix . 'woocommerce_shipping_zone_locations';
		$tables[] = $wpdb->prefix . 'woocommerce_shipping_zone_methods';

		return $tables;
	}

	/**
	 * Get slug from path
	 * @param  string $key
	 * @return string
	 */
	private static function format_plugin_slug( $key ) {
		$slug = explode( '/', $key );
		$slug = explode( '.', end( $slug ) );
		return $slug[0];
	}

	/**
	 * Install a plugin from .org in the background via a cron job (used by
	 * installer - opt in).
	 * @param string $plugin_to_install_id
	 * @param array $plugin_to_install
	 * @since 2.6.0
	 */
	public static function background_installer( $plugin_to_install_id, $plugin_to_install ) {
		// Explicitly clear the event.
		wp_clear_scheduled_hook( 'woocommerce_plugin_background_installer', func_get_args() );

		if ( ! empty( $plugin_to_install['repo-slug'] ) ) {
			require_once( ABSPATH . 'wp-admin/includes/file.php' );
			require_once( ABSPATH . 'wp-admin/includes/plugin-install.php' );
			require_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
			require_once( ABSPATH . 'wp-admin/includes/plugin.php' );

			WP_Filesystem();

			$skin              = new Automatic_Upgrader_Skin;
			$upgrader          = new WP_Upgrader( $skin );
			$installed_plugins = array_map( array( __CLASS__, 'format_plugin_slug' ), array_keys( get_plugins() ) );
			$plugin_slug       = $plugin_to_install['repo-slug'];
			$plugin            = $plugin_slug . '/' . $plugin_slug . '.php';
			$installed         = false;
			$activate          = false;

			// See if the plugin is installed already
			if ( in_array( $plugin_to_install['repo-slug'], $installed_plugins ) ) {
				$installed = true;
				$activate  = ! is_plugin_active( $plugin );
			}

			// Install this thing!
			if ( ! $installed ) {
				// Suppress feedback
				ob_start();

				try {
					$plugin_information = plugins_api( 'plugin_information', array(
						'slug'   => $plugin_to_install['repo-slug'],
						'fields' => array(
							'short_description' => false,
							'sections'          => false,
							'requires'          => false,
							'rating'            => false,
							'ratings'           => false,
							'downloaded'        => false,
							'last_updated'      => false,
							'added'             => false,
							'tags'              => false,
							'homepage'          => false,
							'donate_link'       => false,
							'author_profile'    => false,
							'author'            => false,
						),
					) );

					if ( is_wp_error( $plugin_information ) ) {
						throw new Exception( $plugin_information->get_error_message() );
					}

					$package  = $plugin_information->download_link;
					$download = $upgrader->download_package( $package );

					if ( is_wp_error( $download ) ) {
						throw new Exception( $download->get_error_message() );
					}

					$working_dir = $upgrader->unpack_package( $download, true );

					if ( is_wp_error( $working_dir ) ) {
						throw new Exception( $working_dir->get_error_message() );
					}

					$result = $upgrader->install_package( array(
						'source'                      => $working_dir,
						'destination'                 => WP_PLUGIN_DIR,
						'clear_destination'           => false,
						'abort_if_destination_exists' => false,
						'clear_working'               => true,
						'hook_extra'                  => array(
							'type'   => 'plugin',
							'action' => 'install',
						),
					) );

					if ( is_wp_error( $result ) ) {
						throw new Exception( $result->get_error_message() );
					}

					$activate = true;

				} catch ( Exception $e ) {
					WC_Admin_Notices::add_custom_notice(
						$plugin_to_install_id . '_install_error',
						sprintf(
							__( '%1$s could not be installed (%2$s). <a href="%3$s">Please install it manually by clicking here.</a>', 'woocommerce' ),
							$plugin_to_install['name'],
							$e->getMessage(),
							esc_url( admin_url( 'index.php?wc-install-plugin-redirect=' . $plugin_to_install['repo-slug'] ) )
						)
					);
				}

				// Discard feedback
				ob_end_clean();
			}

			wp_clean_plugins_cache();

			// Activate this thing
			if ( $activate ) {
				try {
					$result = activate_plugin( $plugin );

					if ( is_wp_error( $result ) ) {
						throw new Exception( $result->get_error_message() );
					}
				} catch ( Exception $e ) {
					WC_Admin_Notices::add_custom_notice(
						$plugin_to_install_id . '_install_error',
						sprintf(
							__( '%1$s was installed but could not be activated. <a href="%2$s">Please activate it manually by clicking here.</a>', 'woocommerce' ),
							$plugin_to_install['name'],
							admin_url( 'plugins.php' )
						)
					);
				}
			}
		}
	}

	/**
	 * Install a theme from .org in the background via a cron job (used by installer - opt in).
	 *
	 * @param string $theme_slug
	 * @since 3.1.0
	 */
	public static function theme_background_installer( $theme_slug ) {
		// Explicitly clear the event.
		wp_clear_scheduled_hook( 'woocommerce_theme_background_installer', func_get_args() );

		if ( ! empty( $theme_slug ) ) {
			// Suppress feedback
			ob_start();

			try {
				$theme = wp_get_theme( $theme_slug );

				if ( ! $theme->exists() ) {
					require_once( ABSPATH . 'wp-admin/includes/file.php' );
					include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
					include_once( ABSPATH . 'wp-admin/includes/theme.php' );

					WP_Filesystem();

					$skin     = new Automatic_Upgrader_Skin;
					$upgrader = new Theme_Upgrader( $skin );
					$api      = themes_api( 'theme_information', array(
						'slug'   => $theme_slug,
						'fields' => array( 'sections' => false ),
					) );
					$result   = $upgrader->install( $api->download_link );

					if ( is_wp_error( $result ) ) {
						throw new Exception( $result->get_error_message() );
					} elseif ( is_wp_error( $skin->result ) ) {
						throw new Exception( $skin->result->get_error_message() );
					} elseif ( is_null( $result ) ) {
						throw new Exception( 'Unable to connect to the filesystem. Please confirm your credentials.' );
					}
				}

				switch_theme( $theme_slug );
			} catch ( Exception $e ) {
				WC_Admin_Notices::add_custom_notice(
					$theme_slug . '_install_error',
					sprintf(
						__( '%1$s could not be installed (%2$s). <a href="%3$s">Please install it manually by clicking here.</a>', 'woocommerce' ),
						$theme_slug,
						$e->getMessage(),
						esc_url( admin_url( 'update.php?action=install-theme&theme=' . $theme_slug . '&_wpnonce=' . wp_create_nonce( 'install-theme_' . $theme_slug ) ) )
					)
				);
			}

			// Discard feedback
			ob_end_clean();
		}
	}
}

WC_Install::init();