<?php
/**
 * WooCommerce coupons
 *
 * The WooCommerce coupons class gets coupon data from storage and checks coupon validity
 *
 * @class 		WC_Coupon
 * @version		2.3.0
 * @package		WooCommerce/Classes
 * @category	Class
 * @author		WooThemes
 */
class WC_Coupon {

	// Coupon message codes
	const E_WC_COUPON_INVALID_FILTERED               = 100;
	const E_WC_COUPON_INVALID_REMOVED                = 101;
	const E_WC_COUPON_NOT_YOURS_REMOVED              = 102;
	const E_WC_COUPON_ALREADY_APPLIED                = 103;
	const E_WC_COUPON_ALREADY_APPLIED_INDIV_USE_ONLY = 104;
	const E_WC_COUPON_NOT_EXIST                      = 105;
	const E_WC_COUPON_USAGE_LIMIT_REACHED            = 106;
	const E_WC_COUPON_EXPIRED                        = 107;
	const E_WC_COUPON_MIN_SPEND_LIMIT_NOT_MET        = 108;
	const E_WC_COUPON_NOT_APPLICABLE                 = 109;
	const E_WC_COUPON_NOT_VALID_SALE_ITEMS           = 110;
	const E_WC_COUPON_PLEASE_ENTER                   = 111;
	const E_WC_COUPON_MAX_SPEND_LIMIT_MET 			 = 112;
	const E_WC_COUPON_EXCLUDED_PRODUCTS              = 113;
	const E_WC_COUPON_EXCLUDED_CATEGORIES            = 114;
	const WC_COUPON_SUCCESS                          = 200;
	const WC_COUPON_REMOVED                          = 201;

	/** @public string Coupon code. */
	public $code   = '';

	/** @public int Coupon ID. */
	public $id     = 0;

	/** @public bool Coupon exists */
	public $exists = false;

	/**
	 * Coupon constructor. Loads coupon data.
	 *
	 * @access public
	 * @param mixed $code code of the coupon to load
	 */
	public function __construct( $code ) {
		$this->exists = $this->get_coupon( $code );
	}

	/**
	 * __isset function.
	 *
	 * @param mixed $key
	 * @return bool
	 */
	public function __isset( $key ) {
		if ( in_array( $key, array( 'coupon_custom_fields', 'type', 'amount' ) ) ) {
			return true;
		}
		return false;
	}

	/**
	 * __get function.
	 *
	 * @param mixed $key
	 * @return mixed
	 */
	public function __get( $key ) {
		// Get values or default if not set
		if ( 'coupon_custom_fields' === $key ) {
			$value = $this->id ? get_post_meta( $this->id ) : array();
		} elseif ( 'type' === $key ) {
			$value = $this->discount_type;
		} elseif ( 'amount' === $key ) {
			$value = $this->coupon_amount;
		} else {
			$value = '';
		}
		return $value;
	}

	/**
	 * Checks the coupon type.
	 *
	 * @param string $type Array or string of types
	 * @return bool
	 */
	public function is_type( $type ) {
		return ( $this->discount_type == $type || ( is_array( $type ) && in_array( $this->discount_type, $type ) ) ) ? true : false;
	}

	/**
	 * Gets an coupon from the database.
	 *
	 * @param string $code
	 * @return bool
	 */
	public function get_coupon( $code ) {
		$this->code  = apply_filters( 'woocommerce_coupon_code', $code );

		// Coupon data lets developers create coupons through code
		if ( $coupon = apply_filters( 'woocommerce_get_shop_coupon_data', false, $code ) ) {
			$this->populate( $coupon );
			return true;
		} else {
			global $wpdb;

			$coupon_id = $wpdb->get_var( $wpdb->prepare( apply_filters( 'woocommerce_coupon_code_query', "SELECT ID FROM $wpdb->posts WHERE post_title = %s AND post_type = 'shop_coupon' AND post_status = 'publish'" ), $this->code ) );

			if ( ( $this->id = $coupon_id ) && $this->code === get_the_title( $this->id ) ) {
				$this->populate();
				return true;
			}
		}

		return false;
	}

	/**
	 * Populates an order from the loaded post data.
	 */
	public function populate( $data = array() ) {
		$defaults = array(
			'discount_type'              => 'fixed_cart',
			'coupon_amount'              => 0,
			'individual_use'             => 'no',
			'product_ids'                => array(),
			'exclude_product_ids'        => array(),
			'usage_limit'                => '',
			'usage_limit_per_user'       => '',
			'limit_usage_to_x_items'     => '',
			'usage_count'                => '',
			'expiry_date'                => '',
			'apply_before_tax'           => 'yes',
			'free_shipping'              => 'no',
			'product_categories'         => array(),
			'exclude_product_categories' => array(),
			'exclude_sale_items'         => 'no',
			'minimum_amount'             => '',
			'maximum_amount'             => '',
			'customer_email'             => array()
		);

		foreach ( $defaults as $key => $value ) {
			// Try to load from meta if an ID is present
			if ( $this->id ) {
				$this->$key = get_post_meta( $this->id, $key, true );
			} else {
				$this->$key = ! empty( $data[ $key ] ) ? wc_clean( $data[ $key ] ) : '';

				// Backwards compat field names @deprecated
				if ( 'coupon_amount' === $key ) {
					$this->coupon_amount = ! empty( $data[ 'amount' ] ) ? wc_clean( $data[ 'amount' ] ) : $this->coupon_amount;
				} elseif ( 'discount_type' === $key ) {
					$this->discount_type = ! empty( $data[ 'type' ] ) ? wc_clean( $data[ 'type' ] ) : $this->discount_type;
				}
			}

			if ( empty( $this->$key ) ) {
				$this->$key = $value;
			} elseif ( in_array( $key, array( 'product_ids', 'exclude_product_ids', 'product_categories', 'exclude_product_categories', 'customer_email' ) ) ) {
				$this->$key = $this->format_array( $this->$key );
			} elseif ( in_array( $key, array( 'usage_limit', 'usage_limit_per_user', 'limit_usage_to_x_items', 'usage_count' ) ) ) {
				$this->$key = absint( $this->$key );
			} elseif( 'expiry_date' === $key ) {
				$this->expiry_date = $this->expiry_date && ! is_numeric( $this->expiry_date ) ? strtotime( $this->expiry_date ) : $this->expiry_date;
			}
		}

		do_action( 'woocommerce_coupon_loaded', $this );
	}

	/**
	 * Format loaded data as array
	 * @param  string|array $maybe_array
	 * @return array
	 */
	public function format_array( $maybe_array ) {
		if ( ! is_array( $maybe_array ) ) {
			if ( is_serialized( $maybe_array ) ) {
				$array = maybe_unserialize( $array );
			} else {
				$array = explode( ',', $array );
			}

			return array_filter( array_map( 'trim', array_map( 'strtolower', $array ) ) );
		}
		return $maybe_array;
	}

	/**
	 * Check if coupon needs applying before tax.
	 *
	 * @return bool
	 */
	public function apply_before_tax() {
		return 'yes' === $this->apply_before_tax;
	}

	/**
	 * Check if a coupon enables free shipping.
	 *
	 * @return bool
	 */
	public function enable_free_shipping() {
		return 'yes' === $this->free_shipping;
	}

	/**
	 * Check if a coupon excludes sale items.
	 *
	 * @return bool
	 */
	public function exclude_sale_items() {
		return 'yes' === $this->exclude_sale_items;
	}

	/**
	 * Increase usage count for current coupon.
	 *
	 * @access public
	 * @param  string $used_by Either user ID or billing email
	 * @return void
	 */
	public function inc_usage_count( $used_by = '' ) {
		if ( $this->id ) {
			update_post_meta( $this->id, 'usage_count', ( $this->usage_count ++ ) );

			if ( $used_by ) {
				add_post_meta( $this->id, '_used_by', strtolower( $used_by ) );
			}
		}
	}

	/**
	 * Decrease usage count for current coupon.
	 *
	 * @access public
	 * @param  string $used_by Either user ID or billing email
	 * @return void
	 */
	public function dcr_usage_count( $used_by = '' ) {
		if ( $this->id ) {
			global $wpdb;

			update_post_meta( $this->id, 'usage_count', ( $this->usage_count -- ) );

			// Delete 1 used by meta
			$meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_used_by' AND meta_value = %s AND post_id = %d LIMIT 1;", $used_by, $this->id ) );
			if ( $meta_id ) {
				delete_metadata_by_mid( 'post', $meta_id );
			}
		}
	}

	/**
	 * Returns the error_message string
	 *
	 * @access public
	 * @return string
	 */
	public function get_error_message() {
		return $this->error_message;
	}

	/**
	 * is_valid function.
	 *
	 * Check if a coupon is valid. Return a reason code if invalid. Reason codes:
	 *
	 * @access public
	 * @return boolean validity or a WP_Error if not valid
	 */
	public function is_valid() {
		$error_code = null;
		$valid      = true;
		$error      = false;

		if ( $this->exists ) {

			// Usage Limit
			if ( $this->usage_limit > 0 ) {
				if ( $this->usage_count >= $this->usage_limit ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_USAGE_LIMIT_REACHED;
				}
			}

			// Per user usage limit - check here if user is logged in (against user IDs)
			// Checked again for emails later on in WC_Cart::check_customer_coupons()
			if ( $this->usage_limit_per_user > 0 && is_user_logged_in() ) {
				$used_by     = (array) get_post_meta( $this->id, '_used_by' );
				$usage_count = sizeof( array_keys( $used_by, get_current_user_id() ) );

				if ( $usage_count >= $this->usage_limit_per_user ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_USAGE_LIMIT_REACHED;
				}
			}

			// Expired
			if ( $this->expiry_date ) {
				if ( current_time( 'timestamp' ) > $this->expiry_date ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_EXPIRED;
				}
			}

			// Minimum spend
			if ( $this->minimum_amount > 0 ) {
				if ( $this->minimum_amount > WC()->cart->subtotal ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_MIN_SPEND_LIMIT_NOT_MET;
				}
			}

			// Maximum spend
			if ( $this->maximum_amount > 0 ) {
				if ( $this->maximum_amount < WC()->cart->subtotal ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_MAX_SPEND_LIMIT_MET;
				}
			}

			// Product ids - If a product included is found in the cart then its valid
			if ( sizeof( $this->product_ids ) > 0 ) {
				$valid_for_cart = false;
				if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
					foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {

						if ( in_array( $cart_item['product_id'], $this->product_ids ) || in_array( $cart_item['variation_id'], $this->product_ids ) || in_array( $cart_item['data']->get_parent(), $this->product_ids ) )
							$valid_for_cart = true;
					}
				}
				if ( ! $valid_for_cart ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_NOT_APPLICABLE;
				}
			}

			// Category ids - If a product included is found in the cart then its valid
			if ( sizeof( $this->product_categories ) > 0 ) {
				$valid_for_cart = false;
				if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
					foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {

						$product_cats = wp_get_post_terms($cart_item['product_id'], 'product_cat', array("fields" => "ids"));

						if ( sizeof( array_intersect( $product_cats, $this->product_categories ) ) > 0 )
							$valid_for_cart = true;
					}
				}
				if ( ! $valid_for_cart ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_NOT_APPLICABLE;
				}
			}

			// Exclude Sale Items check for product coupons - valid if a non-sale item is present
			if ( 'yes' === $this->exclude_sale_items && $this->is_type( array( 'fixed_product', 'percent_product' ) ) ) {
				$valid_for_cart      = false;
				$product_ids_on_sale = wc_get_product_ids_on_sale();
				if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
					foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
						if ( sizeof( array_intersect( array( absint( $cart_item['product_id'] ), absint( $cart_item['variation_id'] ), $cart_item['data']->get_parent() ), $product_ids_on_sale ) ) === 0 ) {
							// not on sale
							$valid_for_cart = true;
						}
					}
				}
				if ( ! $valid_for_cart ) {
					$valid = false;
					$error_code = self::E_WC_COUPON_NOT_VALID_SALE_ITEMS;
				}
			}

			// Cart discounts cannot be added if non-eligble product is found in cart
			if ( ! $this->is_type( array( 'fixed_product', 'percent_product' ) ) ) {

				// Exclude Products
				if ( sizeof( $this->exclude_product_ids ) > 0 ) {
					$valid_for_cart = true;
					if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
						foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
							if ( in_array( $cart_item['product_id'], $this->exclude_product_ids ) || in_array( $cart_item['variation_id'], $this->exclude_product_ids ) || in_array( $cart_item['data']->get_parent(), $this->exclude_product_ids ) ) {
								$valid_for_cart = false;
							}
						}
					}
					if ( ! $valid_for_cart ) {
						$valid = false;
						$error_code = self::E_WC_COUPON_EXCLUDED_PRODUCTS;
					}
				}

				// Exclude Sale Items
				if ( $this->exclude_sale_items == 'yes' ) {
					$valid_for_cart = true;
					$product_ids_on_sale = wc_get_product_ids_on_sale();
					if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
						foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
							if ( in_array( $cart_item['product_id'], $product_ids_on_sale, true ) || in_array( $cart_item['variation_id'], $product_ids_on_sale, true ) || in_array( $cart_item['data']->get_parent(), $product_ids_on_sale, true ) ) {
								$valid_for_cart = false;
							}
						}
					}
					if ( ! $valid_for_cart ) {
						$valid = false;
						$error_code = self::E_WC_COUPON_NOT_VALID_SALE_ITEMS;
					}
				}

				// Exclude Categories
				if ( sizeof( $this->exclude_product_categories ) > 0 ) {
					$valid_for_cart = true;
					if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
						foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {

							$product_cats = wp_get_post_terms( $cart_item['product_id'], 'product_cat', array( "fields" => "ids" ) );

							if ( sizeof( array_intersect( $product_cats, $this->exclude_product_categories ) ) > 0 ) {
								$valid_for_cart = false;
							}
						}
					}
					if ( ! $valid_for_cart ) {
						$valid = false;
						$error_code = self::E_WC_COUPON_EXCLUDED_CATEGORIES;
					}
				}
			}

			$valid = apply_filters( 'woocommerce_coupon_is_valid', $valid, $this );

			if ( $valid ) {
				return true;
			} else {
				if ( is_null( $error_code ) )
					$error_code = self::E_WC_COUPON_INVALID_FILTERED;
			}

		} else {
			$error_code = self::E_WC_COUPON_NOT_EXIST;
		}

		if ( $error_code ) {
			$this->error_message = $this->get_coupon_error( $error_code );
		}

		return false;
	}

	/**
	 * Check if a coupon is valid
	 *
	 * @return bool
	 */
	public function is_valid_for_cart() {
		return apply_filters( 'woocommerce_coupon_is_valid_for_cart', $this->is_type( array( 'fixed_cart', 'percent' ) ), $this );
	}

	/**
	 * Check if a coupon is valid for a product
	 *
	 * @param  WC_Product  $product
	 * @return boolean
	 */
	public function is_valid_for_product( $product, $values = array() ) {
		if ( ! $this->is_type( array( 'fixed_product', 'percent_product' ) ) ) {
			return apply_filters( 'woocommerce_coupon_is_valid_for_product', false, $product, $this, $values );
		}

		$valid        = false;
		$product_cats = wp_get_post_terms( $product->id, 'product_cat', array( "fields" => "ids" ) );

		// Specific products get the discount
		if ( sizeof( $this->product_ids ) > 0 ) {

			if ( in_array( $product->id, $this->product_ids ) || ( isset( $product->variation_id ) && in_array( $product->variation_id, $this->product_ids ) ) || in_array( $product->get_parent(), $this->product_ids ) ) {
				$valid = true;
			}

		// Category discounts
		} elseif ( sizeof( $this->product_categories ) > 0 ) {

			if ( sizeof( array_intersect( $product_cats, $this->product_categories ) ) > 0 ) {
				$valid = true;
			}

		} else {
			// No product ids - all items discounted
			$valid = true;
		}

		// Specific product ID's excluded from the discount
		if ( sizeof( $this->exclude_product_ids ) > 0 ) {
			if ( in_array( $product->id, $this->exclude_product_ids ) || ( isset( $product->variation_id ) && in_array( $product->variation_id, $this->exclude_product_ids ) ) || in_array( $product->get_parent(), $this->exclude_product_ids ) ) {
				$valid = false;
			}
		}

		// Specific categories excluded from the discount
		if ( sizeof( $this->exclude_product_categories ) > 0 ) {
			if ( sizeof( array_intersect( $product_cats, $this->exclude_product_categories ) ) > 0 ) {
				$valid = false;
			}
		}

		// Sale Items excluded from discount
		if ( $this->exclude_sale_items == 'yes' ) {
			$product_ids_on_sale = wc_get_product_ids_on_sale();

			if ( in_array( $product->id, $product_ids_on_sale, true ) || ( isset( $product->variation_id ) && in_array( $product->variation_id, $product_ids_on_sale, true ) ) || in_array( $product->get_parent(), $product_ids_on_sale, true ) ) {
				$valid = false;
			}
		}

		return apply_filters( 'woocommerce_coupon_is_valid_for_product', $valid, $product, $this, $values );
	}

	/**
	 * Get discount amount for a cart item
	 *
	 * @param  float $discounting_amount Amount the coupon is being applied to
	 * @param  array|null $cart_item Cart item being discounted if applicable
	 * @param  boolean $single True if discounting a single qty item, false if its the line
	 * @return float Amount this coupon has discounted
	 */
	public function get_discount_amount( $discounting_amount, $cart_item = null, $single = false ) {
		$discount = 0;

		if ( $this->is_type( 'fixed_product' ) ) {

			$discount = $discounting_amount < $this->coupon_amount ? $discounting_amount : $this->coupon_amount;

			// If dealing with a line and not a single item, we need to multiple fixed discount by cart item qty.
			if ( ! $single && ! is_null( $cart_item ) ) {
				// Discount for the line.
				$discount = $discount * $cart_item['quantity'];
			}

		} elseif ( $this->is_type( array( 'percent_product', 'percent' ) ) ) {

			$discount = round( ( $discounting_amount / 100 ) * $this->coupon_amount, WC()->cart->dp );

		} elseif ( $this->is_type( 'fixed_cart' ) ) {
			if ( ! is_null( $cart_item ) ) {
				/**
				 * This is the most complex discount - we need to divide the discount between rows based on their price in
				 * proportion to the subtotal. This is so rows with different tax rates get a fair discount, and so rows
				 * with no price (free) don't get discounted.
				 *
				 * Get item discount by dividing item cost by subtotal to get a %
				 */
				$discount_percent = 0;

				if ( WC()->cart->subtotal_ex_tax ) {
					$discount_percent = ( $cart_item['data']->get_price_excluding_tax() * $cart_item['quantity'] ) / WC()->cart->subtotal_ex_tax;
				}

				$discount = min( ( $this->coupon_amount * $discount_percent ) / $cart_item['quantity'], $discounting_amount );
			} else {
				$discount = min( $this->coupon_amount, $discounting_amount );
			}
		}

		// Handle the limit_usage_to_x_items option
		if ( $this->is_type( array( 'percent_product', 'fixed_product' ) ) && ! is_null( $cart_item ) ) {
			$qty = '' === $this->limit_usage_to_x_items ? $cart_item['quantity'] : min( $this->limit_usage_to_x_items, $cart_item['quantity'] );

			// Reduce limits
			$this->limit_usage_to_x_items = max( 0, $this->limit_usage_to_x_items - $qty );

			if ( $single ) {
				$discount = ( $discount * $qty ) / $cart_item['quantity'];
			} else {
				$discount = ( $discount / $cart_item['quantity'] ) * $qty;
			}
		}

		return apply_filters( 'woocommerce_coupon_get_discount_amount', $discount, $discounting_amount, $cart_item, $single, $this );
	}

	/**
	 * Converts one of the WC_Coupon message/error codes to a message string and
	 * displays the message/error.
	 *
	 * @param int $msg_code Message/error code.
	 * @return void
	 */
	public function add_coupon_message( $msg_code ) {
		if ( $msg_code < 200 ) {
			wc_add_notice( $this->get_coupon_error( $msg_code ), 'error' );
		} else {
			wc_add_notice( $this->get_coupon_message( $msg_code ) );
		}
	}

	/**
	 * Map one of the WC_Coupon message codes to a message string
	 *
	 * @param integer $msg_code
	 * @return string| Message/error string
	 */
	public function get_coupon_message( $msg_code ) {
		switch ( $msg_code ) {
			case self::WC_COUPON_SUCCESS :
				$msg = __( 'Coupon code applied successfully.', 'woocommerce' );
			break;
			case self::WC_COUPON_REMOVED :
				$msg = __( 'Coupon code removed successfully.', 'woocommerce' );
			break;
			default:
				$msg = '';
			break;
		}
		return apply_filters( 'woocommerce_coupon_message', $msg, $msg_code, $this );
	}

	/**
	 * Map one of the WC_Coupon error codes to a message string
	 *
	 * @param int $err_code Message/error code.
	 * @return string| Message/error string
	 */
	public function get_coupon_error( $err_code ) {
		switch ( $err_code ) {
			case self::E_WC_COUPON_INVALID_FILTERED:
				$err = __( 'Coupon is not valid.', 'woocommerce' );
			break;
			case self::E_WC_COUPON_NOT_EXIST:
				$err = __( 'Coupon does not exist!', 'woocommerce' );
			break;
			case self::E_WC_COUPON_INVALID_REMOVED:
				$err = sprintf( __( 'Sorry, it seems the coupon "%s" is invalid - it has now been removed from your order.', 'woocommerce' ), $this->code );
			break;
			case self::E_WC_COUPON_NOT_YOURS_REMOVED:
				$err = sprintf( __( 'Sorry, it seems the coupon "%s" is not yours - it has now been removed from your order.', 'woocommerce' ), $this->code );
			break;
			case self::E_WC_COUPON_ALREADY_APPLIED:
				$err = __( 'Coupon code already applied!', 'woocommerce' );
			break;
			case self::E_WC_COUPON_ALREADY_APPLIED_INDIV_USE_ONLY:
				$err = sprintf( __( 'Sorry, coupon "%s" has already been applied and cannot be used in conjunction with other coupons.', 'woocommerce' ), $this->code );
			break;
			case self::E_WC_COUPON_USAGE_LIMIT_REACHED:
				$err = __( 'Coupon usage limit has been reached.', 'woocommerce' );
			break;
			case self::E_WC_COUPON_EXPIRED:
				$err = __( 'This coupon has expired.', 'woocommerce' );
			break;
			case self::E_WC_COUPON_MIN_SPEND_LIMIT_NOT_MET:
				$err = sprintf( __( 'The minimum spend for this coupon is %s.', 'woocommerce' ), wc_price( $this->minimum_amount ) );
			break;
			case self::E_WC_COUPON_MAX_SPEND_LIMIT_MET:
				$err = sprintf( __( 'The maximum spend for this coupon is %s.', 'woocommerce' ), wc_price( $this->maximum_amount ) );
			break;
			case self::E_WC_COUPON_NOT_APPLICABLE:
				$err = __( 'Sorry, this coupon is not applicable to your cart contents.', 'woocommerce' );
			break;
			case self::E_WC_COUPON_EXCLUDED_PRODUCTS:
				// Store excluded products that are in cart in $products
				$products = array();
				if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
					foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
						if ( in_array( $cart_item['product_id'], $this->exclude_product_ids ) || in_array( $cart_item['variation_id'], $this->exclude_product_ids ) || in_array( $cart_item['data']->get_parent(), $this->exclude_product_ids ) ) {
							$products[] = $cart_item['data']->get_title();
						}
					}
				}

				$err = sprintf( __( 'Sorry, this coupon is not applicable to the products: %s.', 'woocommerce' ), implode( ', ', $products ) );
				break;
			case self::E_WC_COUPON_EXCLUDED_CATEGORIES:
				// Store excluded categories that are in cart in $categories
				$categories = array();
				if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
					foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {

						$product_cats = wp_get_post_terms( $cart_item['product_id'], 'product_cat', array( "fields" => "ids" ) );

						if ( sizeof( $intersect = array_intersect( $product_cats, $this->exclude_product_categories ) ) > 0 ) {

							foreach( $intersect as $cat_id) {
								$cat = get_term( $cat_id, 'product_cat' );
								$categories[] = $cat->name;
							}


						}
					}
				}

				$err = sprintf( __( 'Sorry, this coupon is not applicable to the categories: %s.', 'woocommerce' ), implode( ', ', $categories ) );
				break;
			case self::E_WC_COUPON_NOT_VALID_SALE_ITEMS:
				$err = __( 'Sorry, this coupon is not valid for sale items.', 'woocommerce' );
			break;
			default:
				$err = '';
			break;
		}
		return apply_filters( 'woocommerce_coupon_error', $err, $err_code, $this );
	}

	/**
	 * Map one of the WC_Coupon error codes to an error string
	 * No coupon instance will be available where a coupon does not exist,
	 * so this static method exists.
	 *
	 * @param int $err_code Error code
	 * @return string| Error string
	 */
	public static function get_generic_coupon_error( $err_code ) {
		switch ( $err_code ) {
			case self::E_WC_COUPON_NOT_EXIST:
				$err = __( 'Coupon does not exist!', 'woocommerce' );
			break;
			case self::E_WC_COUPON_PLEASE_ENTER:
				$err = __( 'Please enter a coupon code.', 'woocommerce' );
			break;
			default:
				$err = '';
			break;
		}
		// When using this static method, there is no $this to pass to filter
		return apply_filters( 'woocommerce_coupon_error', $err, $err_code, null );
	}
}