Feature/return user discount

inc/admin/settings/class-lp-settings-general.php

@@ -54,6 +54,15 @@ public function get_settings( $section = '', $tab = '' ) {
 					'type'  => 'heading',
 					'desc'  => __( 'Setting up your currency unit and its formatting.', 'learnpress' )
 				),
+				array(
+					'title'  => __( 'Returning Customer Discount', 'learnpress' ),
+					'id'    => 'returning_customer_discount',
+					'type'  => 'number',
+					'clone' => false,
+					'desc'  => __( 'Set a percentage to discount the courses by if the its a returning customer (enter zero or leave blank for no discount)', 'learnpress' ),
+					'min'   => 0,
+					'std'   => 0
+				),
 				array(
 					'title'   => __( 'Currency', 'learnpress' ),
 					'id' => 'currency',

inc/course/abstract-course.php

@@ -681,7 +681,15 @@ public function get_price() {
 			if ( ! $price /* || 'yes' != $this->get_data('payment') */ ) {
 				$price = 0;
 			} else {
-				if ( false !== ( $sale_price = $this->get_sale_price() ) ) {
+				$hasPaid = learn_press_get_current_user()->is_returning();
+				$maybe_discount = LP()->settings->get( 'returning_customer_discount');
+				if ($hasPaid && $maybe_discount > 0){
+					$price = floatval($price);
+					$price = $price - (($maybe_discount*$price)/100);
+				}
+				$price      = floatval( $price );
+				$sale_price = $this->get_sale_price();
+				if ( is_numeric( $sale_price ) ) {
 					$price = $sale_price;
 				}
 			}

inc/user/abstract-lp-user.php

@@ -267,6 +267,23 @@ public function __get( $key ) {
 			return $return;
 		}
 
+		/**
+		 * 
+		 * @return Bool
+		 * Will return true or false depending on wheter the user is a 
+		 * returning customer or not
+		 */
+
+		public function is_returning($currentID){
+			$hasPaid = false;
+			$filter_status = LP_Request::get_string( 'filter-status' );
+			$query = $this->get_purchased_courses();
+			if(sizeof($query['items']) > 0){
+				$hasPaid = true;
+			}
+			return $hasPaid;
+		}
+
 		/**
 		 * Check if a course is exists then return it's ID.
 		 * Try to get it from global.