package org.wamblee.system;

import junit.framework.TestCase;

public class SystemAssemblerTest extends TestCase {
	
	private ServiceRegistry _registry; 
	
	@Override
	protected void setUp() throws Exception {
		super.setUp();
		_registry = new DefaultServiceRegistry(); 
	}

	public void testEnvironmentApplication() {
		SubSystem environment = new Environment();
		SubSystem application = new Application();
		SystemAssembler assembler = new SystemAssembler(new SubSystem[] {
				environment, application }, new ServiceDescriptor[0]);
		assembler.start(_registry, new Service[0]);
		Service[] envServices = environment.getRunningServices();
		assertEquals(2, envServices.length);
		Service[] appServices = environment.getRunningServices();
		assertEquals(2, appServices.length);
		assertEquals(2, _registry.listAllServices().length);
		
		environment.stop("", _registry);
		assertEquals(0, _registry.listAllServices().length);
		
		application.stop("", _registry); 
		assertEquals(0, _registry.listAllServices().length);
	}

	public void testApplicationEnvironment() {
		try {
			SubSystem environment = new Environment();
			SubSystem application = new Application();
			SystemAssembler assembler = new SystemAssembler(new SubSystem[] {
					application, environment }, new ServiceDescriptor[0]);
			assembler.start(_registry, new Service[0]);
		} catch (SystemAssemblyException e) {
			// e.printStackTrace();
			return;
		}
		fail();
	}

	public void testComposite() {
		SubSystem environment = new Environment();
		SubSystem application = new Application();
		CompositeSystem system = new CompositeSystem("all", new SubSystem[] {
				environment, application }, new ServiceDescriptor[0],
				new ServiceDescriptor[0]);
		system.start("root", _registry, new Service[0]);
		ServiceDescriptor[] required = system.getRequiredServices();
		assertEquals(0, required.length);
		ServiceDescriptor[] provided = system.getProvidedServices();
		assertEquals(0, provided.length);
	}

	public void testCompositeWithWrongProvidedInfo() {
		try {
			SubSystem environment = new Environment();
			SubSystem application = new Application();
			CompositeSystem system = new CompositeSystem("all",
					new SubSystem[] { environment, application },
					new ServiceDescriptor[] { new DefaultServiceDescriptor(
							String.class) }, new ServiceDescriptor[0]);
		} catch (SystemAssemblyException e) {
			return;
		}
		fail();
	}

	public void testCompositeWithSuperfluousRequiredInfo() {
		SubSystem environment = new Environment();
		SubSystem application = new Application();
		CompositeSystem system = new CompositeSystem("all", new SubSystem[] {
				environment, application }, new ServiceDescriptor[0],
				new ServiceDescriptor[] { new DefaultServiceDescriptor(
						String.class) });
		system.start("root", _registry, new Service[0]);
		ServiceDescriptor[] required = system.getRequiredServices();
		assertEquals(1, required.length);
		ServiceDescriptor[] provided = system.getProvidedServices();
		assertEquals(0, provided.length);
	}

	public void testCompositeWithExternalDependencesNotProvided() {
		try {
			SubSystem environment = new Environment();
			SubSystem application = new Application();
			CompositeSystem system = new CompositeSystem("all",
					new SubSystem[] { application }, new ServiceDescriptor[0],
					application.getRequiredServices());
			system.start("root", _registry, new Service[0]);
		} catch (SystemAssemblyException e) {
			return;
		}
		fail();

	}

	public void testCompositeWithExternalDependencesProvided() {

		SubSystem environment = new Environment();
		SubSystem application = new Application();
		CompositeSystem system = new CompositeSystem("all",
				new SubSystem[] { application }, new ServiceDescriptor[0],
				application.getRequiredServices());
		Service[] envServices = environment.start("env", _registry,new Service[0]);
		system.start("root", _registry, envServices);
		ServiceDescriptor[] required = system.getRequiredServices();
		assertEquals(2, required.length);
		ServiceDescriptor[] provided = system.getProvidedServices();
		assertEquals(0, provided.length);

	}

}