/*
 * Copyright 2007 the original author or authors.
 * 
 * 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.wamblee.system.spring;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import junit.framework.TestCase;

import org.wamblee.io.ClassPathResource;
import org.wamblee.system.core.DefaultProvidedInterface;
import org.wamblee.system.core.DefaultRequiredInterface;
import org.wamblee.system.core.DefaultScope;
import org.wamblee.system.core.ProvidedInterface;
import org.wamblee.system.core.RequiredInterface;
import org.wamblee.system.core.Scope;
import org.wamblee.system.core.SystemAssemblyException;
import org.wamblee.test.EventTracker;

public class SpringComponentTest extends TestCase {

	private static final String HELLO_SERVICE_SPRING_XML = "test.org.wamblee.system.spring.xml";
	private static final String HELLO_SERVICE_SPRING_WITH_REQS_XML = "test.org.wamblee.system.springWithRequirements.xml";
	private static final String HELLO_SERVICE_SPRING_WITH_PROPERTIES_XML = "test.org.wamblee.system.springWithProperties.xml";
	private static final String PROPERTY_FILE = "test.org.wamblee.system.spring.properties";
	
	public static EventTracker<String> EVENT_TRACKER;
	
	private Scope _externalScope; 

	@Override
	protected void setUp() throws Exception {
		super.setUp();
		EVENT_TRACKER = new EventTracker<String>();
		_externalScope = new DefaultScope(new ProvidedInterface[0]);
	}

	public void testBlackboxSystem() {
		SpringComponent system = new SpringComponent("system",
				new String[] { HELLO_SERVICE_SPRING_XML },
				new HashMap<String, ProvidedInterface>(),
				new HashMap<RequiredInterface, String>());
		
		Scope runtime = system.start(_externalScope);
		assertEquals(0, _externalScope.getProvidedInterfaces().length);

		system.stop(runtime);
	}

	public void testOneProvidedService() {
		Map<String, ProvidedInterface> provided = new HashMap<String, ProvidedInterface>();
		provided.put("helloService", new DefaultProvidedInterface("hello",
				HelloService.class));

		SpringComponent system = new SpringComponent("system",
				new String[] { HELLO_SERVICE_SPRING_XML }, provided,
				new HashMap<RequiredInterface, String>());
		Scope runtime = system.start(_externalScope);
		ProvidedInterface[] services = runtime.getProvidedInterfaces();
	
		assertEquals(1, services.length);
		Object service = runtime.getInterfaceImplementation(services[0], Object.class);
		assertTrue(service instanceof HelloService);
		
		// BUG; Provided services should be made available in the external scope. 
		Object service2 = _externalScope.getInterfaceImplementation(provided.get("helloService"), Object.class);
		assertSame(service, service2);
		
		assertEquals("Hello world!", ((HelloService) service).say());
		system.stop(runtime);
	}

	public void testWithProperties() throws IOException {
		Map<String, ProvidedInterface> provided = new HashMap<String, ProvidedInterface>();
		provided.put("helloService", new DefaultProvidedInterface("hello",
				HelloService.class));
		SpringComponent system = new SpringComponent("system",
				new String[] { HELLO_SERVICE_SPRING_WITH_PROPERTIES_XML },
				provided, new HashMap<RequiredInterface, String>());
		Properties props = new Properties();
		props.load(new ClassPathResource(PROPERTY_FILE).getInputStream());
		system.addProperties(props);

		Scope scope = system.start(_externalScope);
		// BUG: Hello service was constructed multiple times. Once with the unprocessed property
		// and another time with the processed property. 
		assertEquals(1, EVENT_TRACKER.getEventCount());
		ProvidedInterface[] services = scope.getProvidedInterfaces();
		assertEquals("Property Value", scope.getInterfaceImplementation(services[0], HelloService.class).say());
	}

	public void testWithMissingRequirement() {
		try {
			SpringComponent system = new SpringComponent("system",
					new String[] { HELLO_SERVICE_SPRING_WITH_REQS_XML },
					new HashMap<String, ProvidedInterface>(),
					new HashMap<RequiredInterface, String>());
			system.start(_externalScope);
		} catch (SystemAssemblyException e) {
			// e.printStackTrace();
			return;
		}
		fail();
	}

	public void testWithRequirement() {
		Map<RequiredInterface, String> required = new HashMap<RequiredInterface, String>();
		required.put(new DefaultRequiredInterface("hello", HelloService.class),
				"helloService");
		SpringComponent system = new SpringComponent("system",
				new String[] { HELLO_SERVICE_SPRING_WITH_REQS_XML },
				new HashMap<String, ProvidedInterface>(), required);

		HelloService helloObject = new HelloService("ladida");
		ProvidedInterface helloService = new DefaultProvidedInterface("hello",
				HelloService.class);
		Scope scope = new DefaultScope(new ProvidedInterface[]{ helloService });
		scope.publishInterface(helloService, helloObject);
		system.getRequiredInterfaces()[0].setProvider(helloService);

		Scope runtime = system.start(scope);
		system.stop(runtime);
	}

	public void testWithRequirementAndProvidedService() {
		Map<RequiredInterface, String> required = new HashMap<RequiredInterface, String>();
		required.put(new DefaultRequiredInterface("hello", HelloService.class),
				"helloService");
		Map<String, ProvidedInterface> provided = new HashMap<String, ProvidedInterface>();
		provided.put("blaService", new DefaultProvidedInterface("bla",
				BlaService.class));

		SpringComponent system = new SpringComponent("system",
				new String[] { HELLO_SERVICE_SPRING_WITH_REQS_XML }, provided,
				required);

		HelloService helloObject = new HelloService("ladida");
		ProvidedInterface helloService = new DefaultProvidedInterface("hello",
				HelloService.class);
		Scope scope = new DefaultScope(new ProvidedInterface[] {  helloService });
		scope.publishInterface(helloService, helloObject);
		system.getRequiredInterfaces()[0].setProvider(helloService);
		Scope runtime = system.start(scope);
		ProvidedInterface started = runtime.getProvidedInterfaces()[0];

		Object impl = runtime.getInterfaceImplementation(started, BlaService.class);
		assertNotNull(impl);
		assertTrue(impl instanceof BlaService);
		assertEquals("ladida", ((BlaService)impl).execute());
		system.stop(runtime);
	}

}