/*
 * Copyright 2010 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.examples.shopping
 
dialect "mvel"

import org.drools.examples.shopping.ShoppingExample.Customer
import org.drools.examples.shopping.ShoppingExample.Product
import org.drools.examples.shopping.ShoppingExample.Purchase
import org.drools.examples.shopping.ShoppingExample.Discount
 
rule "Purchase notification"
    salience 10

    when
        $c : Customer()
        $p : Purchase( customer == $c )
    then
        System.out.println( "Customer " + $c.name + " just purchased " + $p.product.name );
end
 
rule "Discount removed notification"
    when
        $c : Customer()
        not Discount( customer == $c )
    then
        $c.discount = 0;
        System.out.println( "Customer " + $c.name + " now has a discount of " + $c.discount );
end

rule "Discount awarded notification"
    when
        $c : Customer()
        $d : Discount( customer == $c )
    then
        System.out.println( "Customer " + $c.name + " now has a discount of " + $d.amount );
end

rule "Apply 10% discount if total purchases is over 100"
    no-loop true
    dialect "java"
    when
        $c : Customer()
        $i : Double(doubleValue > 100) from accumulate (
                Purchase( customer == $c, $price : product.price ),
                sum( $price )
        )
    then
        $c.setDiscount( 10 );
        insertLogical( new Discount( $c, 10 ) );
        System.out.println( "Customer " + $c.getName() + " now has a shopping total of " + $i );
end
