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package io.cucumber.weld;

import io.cucumber.core.backend.CucumberBackendException;
import io.cucumber.core.backend.ObjectFactory;
import io.cucumber.core.logging.Logger;
import io.cucumber.core.logging.LoggerFactory;
import org.apiguardian.api.API;
import org.jboss.weld.environment.se.Weld;
import org.jboss.weld.environment.se.WeldContainer;

@API(status = API.Status.STABLE)
public final class WeldFactory implements ObjectFactory {

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

    private static final String START_EXCEPTION_MESSAGE = "\n" +
            "It looks like you're running on a single-core machine, and Weld doesn't like that. See:\n" +
            "* http://in.relation.to/Bloggers/Weld200Alpha2Released\n" +
            "* https://issues.jboss.org/browse/WELD-1119\n" +
            "\n" +
            "The workaround is to add enabled=false to a org.jboss.weld.executor.properties file on\n" +
            "your CLASSPATH. Beware that this will trigger another Weld bug - startup will now work,\n" +
            "but shutdown will fail with a NullPointerException. This exception will be printed and\n" +
            "not rethrown. It's the best Cucumber-JVM can do until this bug is fixed in Weld.\n" +
            "\n";

    private static final String STOP_EXCEPTION_MESSAGE = "\n" +
            "If you have set enabled=false in org.jboss.weld.executor.properties and you are seeing\n" +
            "this message, it means your weld container didn't shut down properly. It's a Weld bug\n" +
            "and we can't do much to fix it in Cucumber-JVM.\n";

    private WeldContainer containerInstance;

    @Override
    public void start() {
        try {
            containerInstance = new Weld().initialize();
        } catch (IllegalArgumentException e) {
            throw new CucumberBackendException(START_EXCEPTION_MESSAGE, e);
        }
    }

    @Override
    public void stop() {
        try {
            if (containerInstance.isRunning()) {
                containerInstance.close();
            }
        } catch (NullPointerException npe) {
            log.error(npe, () -> STOP_EXCEPTION_MESSAGE);
        }
    }

    @Override
    public boolean addClass(Class clazz) {
        return true;
    }

    @Override
    public  T getInstance(Class type) {
        return containerInstance.select(type).get();
    }

}