wp-e-commerce /
WP-e-Commerce
Complex classes like wpsc_coupons often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use wpsc_coupons, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 44 | class wpsc_coupons { |
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| 45 | |||
| 46 | public $coupon; |
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| 47 | |||
| 48 | public $code; |
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| 49 | public $value; |
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| 50 | public $is_percentage; |
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| 51 | public $conditions; |
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| 52 | public $start_date; |
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| 53 | public $active; |
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| 54 | public $every_product ; |
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| 55 | public $end_date; |
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| 56 | public $use_once; |
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| 57 | public $is_used; |
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| 58 | |||
| 59 | public $discount; |
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| 60 | |||
| 61 | //for error message |
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| 62 | public $errormsg; |
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| 63 | |||
| 64 | /** |
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| 65 | * Coupons constructor |
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| 66 | * |
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| 67 | * Instantiate a coupons object with optional variable $code; |
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| 68 | * |
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| 69 | * @param string code (optional) the coupon code you would like to use. |
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| 70 | * @return bool True if coupon code exists, False otherwise. |
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| 71 | */ |
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| 72 | public function __construct( $code = '' ) { |
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| 73 | global $wpdb; |
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| 74 | |||
| 75 | if ( empty( $code ) ) { |
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| 76 | return false; |
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| 77 | } |
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| 78 | |||
| 79 | $this->code = $code; |
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| 80 | |||
| 81 | $coupon_data = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM `".WPSC_TABLE_COUPON_CODES."` WHERE coupon_code = %s LIMIT 1", $code ) , ARRAY_A ); |
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| 82 | |||
| 83 | if ( empty( $coupon_data ) ) { |
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| 84 | $this->errormsg = true; |
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| 85 | wpsc_delete_customer_meta( 'coupon' ); |
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| 86 | return false; |
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| 87 | } else { |
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| 88 | |||
| 89 | $this->coupon = new WPSC_Coupon( $coupon_data['id'] ); |
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| 90 | |||
| 91 | // Store these values for back-compatibiilty pre 4.0? |
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| 92 | $this->value = $this->coupon->get( 'value' ); |
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| 93 | $this->is_percentage = $this->coupon->get( 'is-percentage' ); |
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| 94 | $this->conditions = $this->coupon->get( 'condition' ); |
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| 95 | $this->is_used = $this->coupon->get( 'is-used' ); |
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| 96 | $this->active = $this->coupon->get( 'active' ); |
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| 97 | $this->use_once = $this->coupon->get( 'use-once' ); |
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| 98 | $this->start_date = $this->coupon->get( 'start' ); |
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| 99 | $this->end_date = $this->coupon->get( 'expiry' ); |
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| 100 | $this->every_product = $this->coupon->get( 'every_product' ); |
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| 101 | $this->errormsg = false; |
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| 102 | |||
| 103 | return $this->validate_coupon(); |
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| 104 | |||
| 105 | } |
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| 106 | |||
| 107 | } |
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| 108 | |||
| 109 | private function has_coupon() { |
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| 110 | |||
| 111 | return isset( $this->coupon ); |
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| 112 | |||
| 113 | } |
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| 114 | |||
| 115 | /** |
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| 116 | * Coupons validator |
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| 117 | * |
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| 118 | * Checks if the current coupon is valid to use (Expiry date, Active, Used). |
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| 119 | * |
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| 120 | * @return bool True if coupon is not expired, used and still active, False otherwise. |
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| 121 | */ |
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| 122 | public function validate_coupon() { |
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| 123 | |||
| 124 | $valid = $this->has_coupon() ? $this->coupon->is_valid() : false; |
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| 125 | |||
| 126 | return apply_filters( 'wpsc_coupons_validate_coupon', $valid, $this ); |
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| 127 | |||
| 128 | } |
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| 129 | |||
| 130 | /** |
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| 131 | * Check whether the coupon has conditions |
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| 132 | * |
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| 133 | * @since 3.8.9 |
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| 134 | * @return boolean True if there are conditions |
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| 135 | */ |
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| 136 | public function has_conditions() { |
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| 137 | |||
| 138 | return $this->has_coupon() ? $this->coupon->has_conditions() : false; |
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| 139 | |||
| 140 | } |
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| 141 | |||
| 142 | /** |
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| 143 | * Check if item's name matches condition |
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| 144 | * |
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| 145 | * @since 3.8.9 |
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| 146 | * @access private |
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| 147 | * @param array $condition Condition arguments |
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| 148 | * @param object $cart_item Cart item |
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| 149 | * @return boolean |
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| 150 | */ |
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| 151 | public function _callback_condition_item_name( $condition, $cart_item ) { |
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| 152 | $product_data = get_post( $cart_item->product_id ); |
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| 153 | |||
| 154 | switch( $condition['logic'] ) { |
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| 155 | |||
| 156 | case 'equal': // Checks if the product name is exactly the same as the condition value |
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| 157 | return $product_data->post_title == $condition['value']; |
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| 158 | |||
| 159 | case 'greater': // Checks if the product name is not the same as the condition value |
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| 160 | return $product_data->post_title > $condition['value']; |
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| 161 | |||
| 162 | case 'less': // Checks if the product name is not the same as the condition value |
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| 163 | return $product_data->post_title < $condition['value']; |
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| 164 | |||
| 165 | case 'contains': // Checks if the product name contains the condition value |
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| 166 | return preg_match( "/(.*)" . preg_quote( $condition['value'], '/' ) . "(.*)/", $product_data->post_title ); |
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| 167 | |||
| 168 | case 'category': // Checks if the product category is the condition value |
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| 169 | $id = $product_data->ID; |
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| 170 | if ( $product_data->post_parent ) |
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| 171 | $id = $product_data->post_parent; |
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| 172 | |||
| 173 | $category_condition = $condition['value']; |
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| 174 | if ( false !== strpos( $category_condition, ',' ) ) { |
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| 175 | $category_condition = explode( ',', $condition['value'] ); |
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| 176 | $category_condition = array_map( 'trim', $category_condition ); |
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| 177 | } |
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| 178 | return has_term( $category_condition, 'wpsc_product_category', $id ); |
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| 179 | |||
| 180 | case 'not_contain': // Checks if the product name contains the condition value |
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| 181 | return ! preg_match( "/(.*)" . preg_quote( $condition['value'], '/' ) . "(.*)/", $product_data->post_title ); |
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| 182 | |||
| 183 | case 'begins': // Checks if the product name begins with condition value |
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| 184 | return preg_match( "/^" . preg_quote( $condition['value'], '/' ) . "/", $product_data->post_title ); |
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| 185 | |||
| 186 | case 'ends': // Checks if the product name ends with condition value |
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| 187 | return preg_match( "/" . preg_quote( $condition['value'], '/' ) . "$/", $product_data->post_title ); |
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| 188 | |||
| 189 | } |
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| 190 | |||
| 191 | return false; |
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| 192 | } |
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| 193 | |||
| 194 | /** |
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| 195 | * Check whether item quantity matches condition |
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| 196 | * |
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| 197 | * @since 3.8.9 |
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| 198 | * @access private |
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| 199 | * @param array $condition Condition arguments |
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| 200 | * @param object $cart_item Cart item |
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| 201 | * @return boolean |
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| 202 | */ |
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| 203 | public function _callback_condition_item_quantity( $condition, $cart_item ) { |
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| 204 | $value = (int) $condition['value']; |
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| 205 | |||
| 206 | switch( $condition['logic'] ) { |
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| 207 | case 'equal': //Checks if the quantity of a product in the cart equals condition value |
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| 208 | return $cart_item->quantity == $value; |
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| 209 | break; |
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| 210 | |||
| 211 | case 'greater'://Checks if the quantity of a product is greater than the condition value |
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| 212 | return $cart_item->quantity > $value; |
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| 213 | break; |
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| 214 | |||
| 215 | case 'less'://Checks if the quantity of a product is less than the condition value |
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| 216 | return $cart_item->quantity < $value; |
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| 217 | break; |
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| 218 | |||
| 219 | case 'contains'://Checks if the product name contains the condition value |
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| 220 | return preg_match( "/(.*)" . $value . "(.*)/", $cart_item->quantity ); |
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| 221 | break; |
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| 222 | |||
| 223 | case 'not_contain'://Checks if the product name contains the condition value |
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| 224 | return ! preg_match( "/(.*)" . $value . "(.*)/",$cart_item->quantity ); |
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| 225 | break; |
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| 226 | |||
| 227 | case 'begins'://Checks if the product name begins with condition value |
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| 228 | return preg_match( "/^" . $value ."/", $cart_item->quantity ); |
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| 229 | break; |
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| 230 | |||
| 231 | case 'ends'://Checks if the product name ends with condition value |
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| 232 | return preg_match( "/" . $value . "$/",$cart_item->quantity ); |
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| 233 | break; |
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| 234 | } |
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| 235 | |||
| 236 | return false; |
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| 237 | } |
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| 238 | |||
| 239 | /** |
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| 240 | * Check whether total quantity matches condition |
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| 241 | * |
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| 242 | * @since 3.8.9 |
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| 243 | * @access private |
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| 244 | * @param array $condition Condition arguments |
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| 245 | * @param object $cart_item Cart item |
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| 246 | * @return boolean |
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| 247 | */ |
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| 248 | public function _callback_condition_total_quantity( $condition, $cart_item ) { |
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| 249 | |||
| 250 | $total_quantity = wpsc_cart_item_count(); |
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| 251 | $value = (int) $condition['value']; |
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| 252 | |||
| 253 | switch( $condition['logic'] ) { |
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| 254 | case 'equal'://Checks if the quantity of products in the cart equals condition value |
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| 255 | return $total_quantity == $value; |
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| 256 | break; |
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| 257 | |||
| 258 | case 'greater'://Checks if the quantity in the cart is greater than the condition value |
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| 259 | return $total_quantity > $value; |
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| 260 | break; |
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| 261 | |||
| 262 | case 'less'://Checks if the quantity in the cart is less than the condition value |
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| 263 | return $total_quantity < $value; |
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| 264 | break; |
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| 265 | } |
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| 266 | |||
| 267 | return false; |
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| 268 | } |
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| 269 | |||
| 270 | /** |
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| 271 | * Checks whether subtotal matches condition |
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| 272 | * |
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| 273 | * @since 3.8.9 |
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| 274 | * @access private |
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| 275 | * @param array $condition Condition arguments |
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| 276 | * @param object $cart_item Cart item |
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| 277 | * @return |
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| 278 | */ |
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| 279 | public function _callback_condition_subtotal_amount( $condition, $cart_item ) { |
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| 280 | global $wpsc_cart; |
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| 281 | $subtotal = $wpsc_cart->calculate_subtotal(); |
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| 282 | $value = (float) $condition['value']; |
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| 283 | |||
| 284 | switch( $condition['logic'] ) { |
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| 285 | case 'equal'://Checks if the subtotal of products in the cart equals condition value |
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| 286 | return $subtotal == $value; |
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| 287 | break; |
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| 288 | |||
| 289 | case 'greater'://Checks if the subtotal of the cart is greater than the condition value |
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| 290 | return $subtotal > $value; |
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| 291 | break; |
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| 292 | |||
| 293 | case 'less'://Checks if the subtotal of the cart is less than the condition value |
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| 294 | return $subtotal < $value; |
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| 295 | break; |
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| 296 | } |
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| 297 | |||
| 298 | return false; |
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| 299 | } |
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| 300 | |||
| 301 | /** |
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| 302 | * Filter out cart items that don't match coupon conditions |
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| 303 | * |
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| 304 | * @since 3.8.9 |
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| 305 | * @access private |
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| 306 | * @param object $cart_item Cart item |
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| 307 | * @return bool |
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| 308 | */ |
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| 309 | public function _filter_cart_item_conditions( $cart_item ) { |
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| 310 | global $wpsc_cart; |
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| 311 | |||
| 312 | $compare_logic = false; |
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| 313 | |||
| 314 | $conditions = $this->has_coupon() ? $this->coupon->get( 'condition' ) : array(); |
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| 315 | |||
| 316 | foreach ( $conditions as $condition ) { |
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| 317 | |||
| 318 | $callback = '_callback_condition_' . $condition['property']; |
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| 319 | |||
| 320 | if ( is_callable( array( $this, $callback ) ) ) { |
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| 321 | |||
| 322 | $result = $this->$callback( $condition, $cart_item ); |
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| 323 | |||
| 324 | } else { |
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| 325 | |||
| 326 | /* This allows for a function outside of this class to override a custom condition. */ |
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| 327 | if ( function_exists( $callback ) ) { |
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| 328 | $result = $callback( $condition, $cart_item ); |
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| 329 | } else { |
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| 330 | /* This allows for a plugin to create a condition callback for the condition. Perk: doesn't have to follow $callback nomenclature. */ |
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| 331 | $result = apply_filters( 'wpsc_coupon_conditions_default_callback', false, $callback, $condition, $cart_item ); |
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| 332 | } |
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| 333 | |||
| 334 | } |
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| 335 | |||
| 336 | if ( ! $result ) { |
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| 337 | switch ( $condition['operator'] ) { |
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| 338 | case 'or': |
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| 339 | $compare_logic = $compare_logic || apply_filters( 'wpsc_coupon_compare_logic', false, $condition, $cart_item ); |
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| 340 | break; |
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| 341 | case 'and': |
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| 342 | $compare_logic = $compare_logic && apply_filters( 'wpsc_coupon_compare_logic', false, $condition, $cart_item ); |
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| 343 | break; |
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| 344 | default: |
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| 345 | $compare_logic = apply_filters( 'wpsc_coupon_compare_logic', false, $condition, $cart_item ); |
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| 346 | } |
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| 347 | } else { |
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| 348 | switch ( $condition['operator'] ) { |
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| 349 | case 'or': |
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| 350 | $compare_logic = $compare_logic || $result; |
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| 351 | break; |
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| 352 | case 'and': |
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| 353 | $compare_logic = $compare_logic && $result; |
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| 354 | break; |
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| 355 | default: |
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| 356 | $compare_logic = $result; |
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| 357 | } |
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| 358 | } |
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| 359 | } |
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| 360 | |||
| 361 | return $compare_logic; |
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| 362 | } |
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| 363 | |||
| 364 | /** |
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| 365 | * Get cart items that match coupon conditions |
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| 366 | * |
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| 367 | * @since 3.8.9 |
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| 368 | * @access private |
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| 369 | * @return array Array containing eligible cart items |
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| 370 | */ |
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| 371 | public function get_eligible_items() { |
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| 372 | global $wpsc_cart; |
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| 373 | |||
| 374 | $conditions = $this->has_coupon() ? $this->coupon->get( 'condition' ) : array(); |
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| 375 | |||
| 376 | // cache product objects if we have a "item name" condition |
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| 377 | if ( in_array( 'item_name', $conditions ) ) { |
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| 378 | $ids = $wpsc_cart->get_items( array( 'fields' => 'product_id' ) ); |
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| 379 | get_posts( array( |
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| 380 | 'post_type' => 'wpsc-product', |
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| 381 | 'numberposts' => -1, |
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| 382 | 'post__in' => array( $ids ), |
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| 383 | ) ); |
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| 384 | } |
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| 385 | |||
| 386 | // sort the items by total price so that we can use this in $this->calculate_discount_conditions() |
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| 387 | $orderby = apply_filters( 'wpsc_coupon_select_item_orderby', 'unit_price' ); |
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| 388 | $order = apply_filters( 'wpsc_coupon_select_item_order' , 'ASC' ); |
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| 389 | $cart_items = $wpsc_cart->get_items( array( 'orderby' => $orderby, 'order' => $order ) ); |
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| 390 | |||
| 391 | $cart_items = array_filter( $cart_items, array( $this, '_filter_cart_item_conditions' ) ); |
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| 392 | |||
| 393 | return $cart_items; |
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| 394 | } |
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| 395 | |||
| 396 | /** |
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| 397 | * Calculate the subtotal of the items passed in as argument |
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| 398 | * |
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| 399 | * @since 3.8.9 |
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| 400 | * @access private |
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| 401 | * @param array $items Array of items |
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| 402 | * @return float Subtotal |
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| 403 | */ |
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| 404 | private function calculate_subtotal( $items ) { |
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| 405 | $total = 0; |
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| 406 | |||
| 407 | foreach ( $items as $item ) { |
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| 408 | $total += $item->total_price; |
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| 409 | } |
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| 410 | |||
| 411 | return $total; |
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| 412 | } |
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| 413 | |||
| 414 | /** |
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| 415 | * Get the total quantity of the items passed in as argument |
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| 416 | * |
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| 417 | * @since 3.8.9 |
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| 418 | * @access private |
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| 419 | * @param array $items Array of items |
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| 420 | * @return float Subtotal |
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| 421 | */ |
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| 422 | private function get_total_quantity( $items ) { |
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| 423 | $total = 0; |
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| 424 | |||
| 425 | foreach ( $items as $item ) { |
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| 426 | $total += $item->quantity; |
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| 427 | } |
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| 428 | |||
| 429 | return $total; |
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| 430 | } |
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| 431 | |||
| 432 | /** |
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| 433 | * Calculate the discount amount, taking coupon conditions into consideration |
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| 434 | * |
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| 435 | * @since 3.8.9 |
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| 436 | * @access private |
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| 437 | * @return float Discount amount |
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| 438 | */ |
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| 439 | private function calculate_discount_conditions() { |
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| 440 | global $wpsc_cart; |
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| 441 | |||
| 442 | if ( ! $this->has_coupon() ) { |
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| 443 | return 0; |
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| 444 | } |
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| 445 | |||
| 446 | // findout whether the cart meet the conditions |
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| 447 | $items = $this->get_eligible_items(); |
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| 448 | |||
| 449 | if ( empty( $items ) ) |
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| 450 | return 0; |
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| 451 | |||
| 452 | // if this is free shipping, return the total shipping regardless of whether "Apply on all |
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| 453 | // products" is checked or not |
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| 454 | if ( $this->coupon->is_free_shipping() ) { |
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| 455 | return $this->calculate_free_shipping(); |
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| 456 | } |
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| 457 | |||
| 458 | // if "Apply on all products" is checked, discount amount should be based on the total values |
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| 459 | // of eligible cart items |
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| 460 | if ( $this->coupon->applies_to_all_items() ) { |
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| 461 | if ( $this->coupon->is_percentage() ) { |
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| 462 | $subtotal = $this->calculate_subtotal( $items ); |
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| 463 | $discount = $this->coupon->get_percentage_discount( $subtotal ); |
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| 464 | } else { |
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| 465 | $quantity = $this->get_total_quantity( $items ); |
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| 466 | $discount = $this->coupon->get_fixed_discount( $quantity ); |
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| 467 | } |
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| 468 | return $discount; |
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| 469 | } |
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| 470 | |||
| 471 | // if "Apply on all products" is not checked and the coupon is percentage, the discount |
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| 472 | // amount should be based on the eligible cart item with lowest unit price |
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| 473 | if ( $this->coupon->is_percentage() ) { |
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| 474 | |||
| 475 | $field = apply_filters( 'wpsc_coupon_select_item_field', 'unit_price' ); |
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| 476 | $item = array_shift( $items ); |
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| 477 | |||
| 478 | return $this->coupon->get_percentage_discount( $item->$field ); |
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| 479 | |||
| 480 | } |
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| 481 | |||
| 482 | // if "Apply on all products" is not checked and the coupon is a fixed value |
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| 483 | // return the discount value |
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| 484 | return $this->coupon->get( 'value' ); |
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| 485 | } |
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| 486 | |||
| 487 | /** |
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| 488 | * Calculate discount amount without taking conditions into consideration |
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| 489 | * |
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| 490 | * @since 3.8.9 |
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| 491 | * @access private |
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| 492 | * @return float Discount amount |
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| 493 | */ |
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| 494 | private function calculate_discount_without_conditions() { |
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| 495 | global $wpsc_cart; |
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| 496 | |||
| 497 | if ( ! $this->has_coupon() ) { |
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| 498 | return 0; |
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| 499 | } |
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| 500 | |||
| 501 | // if this is free shipping, return the total shipping regardless of whether "Apply on all |
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| 502 | // products" is checked or not |
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| 503 | if ( $this->coupon->is_free_shipping() ) { |
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| 504 | return $this->calculate_free_shipping(); |
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| 505 | } |
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| 506 | |||
| 507 | // if "Apply on all products" is checked, discount amount should be based on the overall |
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| 508 | // cart |
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| 509 | if ( $this->coupon->applies_to_all_items() ) { |
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| 510 | if ( $this->coupon->is_percentage() ) { |
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| 511 | $subtotal = $wpsc_cart->calculate_subtotal(); |
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| 512 | $discount = $this->coupon->get_percentage_discount( $subtotal ); |
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| 513 | } else { |
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| 514 | $discount = $this->coupon->get_fixed_discount( wpsc_cart_item_count() ); |
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| 515 | } |
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| 516 | return $discount; |
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| 517 | } |
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| 518 | |||
| 519 | // if "Apply on all products" is not checked and the coupon is percentage, the discount |
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| 520 | // amount should be based on the cart item with lowest unit_price |
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| 521 | if ( $this->coupon->is_percentage() ) { |
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| 522 | $orderby = apply_filters( 'wpsc_coupon_select_item_orderby', 'unit_price' ); |
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| 523 | $order = apply_filters( 'wpsc_coupon_select_item_order' , 'ASC' ); |
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| 524 | $field = apply_filters( 'wpsc_coupon_select_item_field' , 'unit_price' ); |
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| 525 | $cart_items = $wpsc_cart->get_items( array( 'fields' => $field, 'orderby' => $orderby, 'order' => $order ) ); |
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| 526 | if ( empty( $cart_items ) ) |
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| 527 | return 0; |
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| 528 | |||
| 529 | $item = array_shift( $cart_items ); |
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| 530 | |||
| 531 | return $this->coupon->get_percentage_discount( $item ); |
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| 532 | |||
| 533 | } |
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| 534 | |||
| 535 | // if "Apply on all products" is not checked and the coupon is a fixed value |
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| 536 | // return the discount value |
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| 537 | return $this->coupon->get( 'value' ); |
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| 538 | } |
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| 539 | |||
| 540 | /** |
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| 541 | * Check whether this coupon is a "Free shipping" coupon |
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| 542 | * |
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| 543 | * @since 3.8.9 |
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| 544 | * @return boolean |
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| 545 | */ |
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| 546 | public function is_free_shipping() { |
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| 547 | |||
| 548 | return $this->has_coupon() ? $this->coupon->is_free_shipping() : false; |
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| 549 | |||
| 550 | } |
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| 551 | |||
| 552 | /** |
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| 553 | * Check whether this coupon is a "percentage" coupon |
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| 554 | * |
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| 555 | * @since 3.8.9 |
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| 556 | * @return boolean |
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| 557 | */ |
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| 558 | public function is_percentage() { |
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| 559 | |||
| 560 | return $this->has_coupon() ? $this->coupon->is_percentage() : false; |
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| 561 | |||
| 562 | } |
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| 563 | |||
| 564 | /** |
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| 565 | * Check whether this coupon is a fixed amount coupon |
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| 566 | * |
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| 567 | * @since 3.8.9 |
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| 568 | * @return boolean |
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| 569 | */ |
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| 570 | public function is_fixed_amount() { |
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| 571 | |||
| 572 | return $this->has_coupon() ? $this->coupon->is_fixed_amount() : false; |
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| 573 | |||
| 574 | } |
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| 575 | |||
| 576 | /** |
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| 577 | * Check whether this coupon can be applied to all items |
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| 578 | * |
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| 579 | * @since 3.8.9 |
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| 580 | * @return boolean |
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| 581 | */ |
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| 582 | public function applies_to_all_items() { |
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| 583 | |||
| 584 | return $this->has_coupon() ? $this->coupon->applies_to_all_items() : false; |
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| 585 | |||
| 586 | } |
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| 587 | |||
| 588 | /** |
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| 589 | * Calculate the free shipping discount amount |
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| 590 | * @return float |
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| 591 | */ |
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| 592 | private function calculate_free_shipping() { |
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| 596 | |||
| 597 | |||
| 598 | /** |
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| 599 | * Calculate the discount amount |
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| 600 | * |
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| 601 | * @since 3.8.9 |
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| 602 | * @return float |
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| 603 | */ |
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| 604 | public function calculate_discount() { |
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| 605 | global $wpsc_cart; |
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| 606 | |||
| 607 | $wpsc_cart->clear_cache(); |
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| 608 | |||
| 609 | if ( $this->has_conditions() ) { |
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| 610 | return $this->calculate_discount_conditions(); |
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| 611 | } else { |
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| 612 | return $this->calculate_discount_without_conditions(); |
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| 613 | } |
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| 616 | |||
| 617 | /** |
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| 618 | * Comparing logic with the product information |
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| 619 | * |
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| 620 | * Checks if the product matches the logic |
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| 621 | * |
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| 622 | * @todo Is this ever even used? |
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| 623 | * |
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| 624 | * @return bool True if all conditions are matched, False otherwise. |
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| 625 | */ |
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| 626 | function compare_logic( $condition, $product ) { |
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| 785 | |||
| 786 | /** |
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| 787 | * uses coupons function, no parameters |
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| 788 | * @return boolean if true, items in the cart do use coupons |
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| 789 | */ |
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| 790 | function uses_coupons() { |
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| 797 | } |
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