/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.cocoon.samples.flow.groovy

import org.apache.cocoon.components.flow.java.AbstractContinuable

public class CalculatorFlow extends AbstractContinuable {

    count = 1

    public void doCalculator() {
        a = getNumber "a", 0, 0    // This is a method call
        b = getNumber("b", a, 0)
        op = getOperator(a, b)

        result = 0
        switch (op) {
            case "plus":
                result= a + b
                break
            case "minus":
                result = a - b
                break
            case "multiply":
                result = a * b
                break
             case "divide":
                if (b != 0) {
                    sendMessage "Error: Cannot divide by zero!"
                } else {
                    result = a / b
                }
                break
             default:
                sendMessage "Error: Unkown operator!"
        }
        sendPage("page/calculator-result", ["a" :  a, "b":  b, "operator": op, "result": result, "count" : count])
        count++
    }

    private getNumber(name, a, b) {
        uri = "page/calculator-" + name.toLowerCase()
        sendPageAndWait(uri, ["a" :  a, "b":  b, "count" : count])
        getRequest().getParameter(name)
    }

    private getOperator(a, b) {
        sendPageAndWait("page/calculator-operator", ["a" :  a, "b":  b, "count" : count])
        getRequest().getParameter("operator")
    }

    private void sendMessage(message) {
        sendPageAndWait("page/calculator-message", ["message" : message, "count" : count])
    }
}