/*
 * Copyright (c) 2012, 2013, Werner Keil, Credit Suisse (Anatole Tresch).
 * 
 * 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.
 * 
 * 
 * Contributors: Anatole Tresch - initial version.
 */
package org.javamoney.cdi;

import org.jboss.weld.environment.se.Weld;
import org.jboss.weld.environment.se.WeldContainer;

import javax.enterprise.inject.Instance;
import javax.inject.Named;
import java.lang.annotation.Annotation;
import java.util.Set;

/**
 * Small herlper class for starting CDI for testing.
 */
public final class SEContainer {

    private static boolean hookRegistered = false;
    private static Weld weld;
    private static WeldContainer weldContainer;

    public static <T> T getInstance(Class<T> instanceType,
                                    Annotation... qualifiers) {
        start();
        return weldContainer.instance().select(instanceType, qualifiers).get();
    }

    public static <T> Instance<T> getInstances(Class<T> instanceType,
                                               Annotation... qualifiers) {
        start();
        return weldContainer.instance().select(instanceType, qualifiers);
    }

    public static Set<?> getInstances(String name) {
        start();
        return weldContainer.getBeanManager().getBeans(name);
    }

    public static void fireEvent(Object evt, Annotation... qualifiers) {
        start();
        weldContainer.getBeanManager().fireEvent(evt, qualifiers);
    }

    public static synchronized void start() {
        if (weld == null) {
            System.out.println("*** Starting CDIContainer ...");
            weld = new Weld();
            weldContainer = weld.initialize();
            weldContainer.instance().select(WeldContainer.class).get();
            if (!hookRegistered) {
                Runtime.getRuntime().addShutdownHook(new Thread() {
                    @Override
                    public void run() {
                        SEContainer.stop();
                    }
                });
                hookRegistered = true;
            }
            System.out.println("*** CDIContainer started.");
        }
    }

    public static synchronized void stop() {
        if (weld != null) {
            System.out.println("*** Stopping CDIContainer ...");
            weld.shutdown();
            weld = null;
            System.out.println("*** CDIContainer stopped.");
        }
    }

    @SuppressWarnings("unchecked")
    public static <T> T getNamedInstance(Class<T> type, String id) {
        start();
        Set<?> found = weldContainer.getBeanManager().getBeans(id);
        if (found.isEmpty()) {
            return null;
        }
        for (Object object : found) {
            if (type.isAssignableFrom(object.getClass())) {
                return (T) object;
            }
        }
        return null;
    }

    public static String getName(Object o) {
        if (o == null) {
            return "<null>";
        }
        Named named = o.getClass().getAnnotation(Named.class);
        if (named != null) {
            return named.value();
        }
        return o.getClass().getSimpleName();
    }
}