/*
 *  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.isis.core.unittestsupport.jmocking;

import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;

import org.hamcrest.Description;
import org.jmock.api.Action;
import org.jmock.api.Invocation;

public final class JMockActions {
    
    private JMockActions() {
    }
    
    public static <T> Action returnEach(final T... values) {
        return new ReturnEachAction<T>(values);
    }

    public static Action returnArgument(final int i) {
        return new ReturnArgumentJMockAction(i);
    }

    private static class ReturnEachAction<T> implements Action {
        
        private final Collection<T> collection;
        private final Iterator<T> iterator;
        
        ReturnEachAction(Collection<T> collection) {
            this.collection = collection;
            this.iterator = collection.iterator();
        }
        
        private ReturnEachAction(T... array) {
            this(Arrays.asList(array));
        }
        
        public T invoke(Invocation invocation) throws Throwable {
            return iterator.next();
        }
        
        public void describeTo(Description description) {
            description.appendValueList("return iterator.next() over ", ", ", "", collection);
        }
    }

    private static final class ReturnArgumentJMockAction implements Action {
        private final int i;

        private ReturnArgumentJMockAction(final int i) {
            this.i = i;
        }

        public void describeTo(final Description description) {
            description.appendText("parameter #" + i + " ");
        }

        public Object invoke(final Invocation invocation) throws Throwable {
            return invocation.getParameter(i);
        }
    }
}
