/*
 * 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.brooklyn.core.effector;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;

import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.brooklyn.api.effector.Effector;
import org.apache.brooklyn.api.effector.ParameterType;
import org.apache.brooklyn.api.entity.Entity;
import org.apache.brooklyn.api.entity.EntitySpec;
import org.apache.brooklyn.api.entity.ImplementedBy;
import org.apache.brooklyn.api.mgmt.ExecutionContext;
import org.apache.brooklyn.api.mgmt.Task;
import org.apache.brooklyn.core.annotation.EffectorParam;
import org.apache.brooklyn.core.effector.MethodEffector;
import org.apache.brooklyn.core.entity.AbstractEntity;
import org.apache.brooklyn.core.entity.trait.Startable;
import org.apache.brooklyn.core.mgmt.BrooklynTaskTags;
import org.apache.brooklyn.core.mgmt.internal.ManagementContextInternal;
import org.apache.brooklyn.core.test.BrooklynAppUnitTestSupport;
import org.apache.brooklyn.util.collections.MutableMap;
import org.apache.brooklyn.util.core.task.BasicTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

/**
 * Test the operation of the {@link Effector} implementations.
 *
 * TODO clarify test purpose
 */
public class EffectorSayHiTest extends BrooklynAppUnitTestSupport {
    
    //TODO test edge/error conditions
    //(missing parameters, wrong number of params, etc)

    private static final Logger log = LoggerFactory.getLogger(EffectorSayHiTest.class);

    private MyEntity e;

    @BeforeMethod(alwaysRun=true)
    @Override
    public void setUp() throws Exception {
        super.setUp();
        e = app.createAndManageChild(EntitySpec.create(MyEntity.class));
    }

    @Test
    public void testFindEffectorMetaData() {
        assertEquals("sayHi1", MyEntity.SAY_HI_1.getName());
        assertEquals("says hello", MyEntity.SAY_HI_1.getDescription());
        
        assertEquals(ImmutableList.of("name", "greeting"), getParameterNames(MyEntity.SAY_HI_1));
        assertEquals(MutableMap.of("name", null, "greeting", "what to say"), getParameterDescriptions(MyEntity.SAY_HI_1));
    }

    @Test
    public void testFindTraitEffectors() {
        assertEquals(ImmutableList.of("locations"), getParameterNames(Startable.START));
    }

    @Test
    public void testInvokeEffectors1() throws Exception {
        assertEquals("hi Bob", e.sayHi1("Bob", "hi"));

        assertEquals("hi Bob", MyEntity.SAY_HI_1.call(e, ImmutableMap.of("name", "Bob", "greeting", "hi")) );
        assertEquals("hi Bob", e.invoke(MyEntity.SAY_HI_1, ImmutableMap.of("name", "Bob", "greeting", "hi")).get() );
        
        // and with default greeting param value
        assertEquals("hi Bob", MyEntity.SAY_HI_1.call(e, ImmutableMap.of("name", "Bob", "greeting", "hi")) );
        assertEquals("hello Bob", e.invoke(MyEntity.SAY_HI_1, ImmutableMap.of("name", "Bob")).get() );
    }

    @Test
    public void testCanRetrieveTaskForEffector() {
        e.sayHi1("Bob", "hi");

        Set<Task<?>> tasks = mgmt.getExecutionManager().getTasksWithAllTags(ImmutableList.of(
                BrooklynTaskTags.tagForContextEntity(e),ManagementContextInternal.EFFECTOR_TAG));
        assertEquals(tasks.size(), 1);
        assertTrue(tasks.iterator().next().getDescription().contains("sayHi1"));
    }

    @Test
    public void testDelegatedNestedEffectorNotRepresentedAsTask() {
        e.delegateSayHi1("Bob", "hi");

        Set<Task<?>> tasks = mgmt.getExecutionManager().getTasksWithAllTags(ImmutableList.of(
                BrooklynTaskTags.tagForContextEntity(e),ManagementContextInternal.EFFECTOR_TAG));
        assertEquals(tasks.size(), 1);
        assertTrue(tasks.iterator().next().getDescription().contains("delegateSayHi1"));
        assertFalse(tasks.iterator().next().getDescription().contains("sayHi1"));
    }

    @Test
    public void testCanExcludeNonEffectorTasks() throws Exception {
        ExecutionContext executionContext = mgmt.getExecutionContext(e);
        executionContext.submit(new BasicTask<Void>(new Runnable() { @Override public void run() {} }));

        Set<Task<?>> effectTasks = mgmt.getExecutionManager().getTasksWithAllTags(ImmutableList.of(
                BrooklynTaskTags.tagForContextEntity(e),ManagementContextInternal.EFFECTOR_TAG));
        assertEquals(effectTasks.size(), 0);
    }

    public interface CanSayHi {
        static MethodEffector<String> SAY_HI_1 = new MethodEffector<String>(CanSayHi.class, "sayHi1");
        static MethodEffector<String> DELEGATE_SAY_HI_1 = new MethodEffector<String>(CanSayHi.class, "delegateSayHi1");
    
        @org.apache.brooklyn.core.annotation.Effector(description="says hello")
        public String sayHi1(
            @EffectorParam(name="name") String name,
            @EffectorParam(name="greeting", defaultValue="hello", description="what to say") String greeting);
        
        @org.apache.brooklyn.core.annotation.Effector(description="delegate says hello")
        public String delegateSayHi1(
            @EffectorParam(name="name") String name,
            @EffectorParam(name="greeting") String greeting);
    }

    @ImplementedBy(MyEntityImpl.class)
    public interface MyEntity extends Entity, CanSayHi {
    }
    
    public static class MyEntityImpl extends AbstractEntity implements MyEntity {
        @Override
        public String sayHi1(String name, String greeting) {
            return greeting+" "+name;
        }
        @Override
        public String delegateSayHi1(String name, String greeting) {
            return sayHi1(name, greeting);
        }
    }
    
    private List<String> getParameterNames(Effector<?> effector) {
        return ImmutableList.copyOf(getParameterDescriptions(effector).keySet());
    }
    
    private Map<String, String> getParameterDescriptions(Effector<?> effector) {
        Map<String,String> result = Maps.newLinkedHashMap();
        for (ParameterType<?> parameter : effector.getParameters()) {
            result.put(parameter.getName(), parameter.getDescription());
        }
        return result;
    }
}
