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package org.glassfish.jersey.server;

import java.util.Collection;
import java.util.Comparator;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;

import org.glassfish.jersey.internal.BootstrapBag;
import org.glassfish.jersey.internal.BootstrapConfigurator;
import org.glassfish.jersey.internal.ServiceConfigurationError;
import org.glassfish.jersey.internal.ServiceFinder;
import org.glassfish.jersey.internal.inject.InjectionManager;
import org.glassfish.jersey.internal.util.collection.LazyValue;
import org.glassfish.jersey.internal.util.collection.Value;
import org.glassfish.jersey.internal.util.collection.Values;
import org.glassfish.jersey.model.internal.RankedComparator;
import org.glassfish.jersey.model.internal.RankedProvider;
import org.glassfish.jersey.server.spi.ComponentProvider;

/**
 * Configurator which initializes and register {@link ComponentProvider} instances into {@link BootstrapBag}.
 *
 * @author Petr Bouda (petr.bouda at oracle.com)
 */
class ComponentProviderConfigurator implements BootstrapConfigurator {

    private static final Comparator<RankedProvider<ComponentProvider>> RANKED_COMPARATOR =
            new RankedComparator<>(RankedComparator.Order.DESCENDING);

    @Override
    public void init(InjectionManager injectionManager, BootstrapBag bootstrapBag) {
        ServerBootstrapBag serverBag = (ServerBootstrapBag) bootstrapBag;

        // There are situation in which ComponentProviders are not needed therefore their entire initialization is wrapped
        // into a lazy block.
        LazyValue<Collection<ComponentProvider>> componentProviders =
                Values.lazy((Value<Collection<ComponentProvider>>) () -> getRankedComponentProviders().stream()
                        .map(RankedProvider::getProvider)
                        .peek(provider -> provider.initialize(injectionManager))
                        .collect(Collectors.toList()));
        serverBag.setComponentProviders(componentProviders);
    }

    @Override
    public void postInit(InjectionManager injectionManager, BootstrapBag bootstrapBag) {
        ServerBootstrapBag serverBag = (ServerBootstrapBag) bootstrapBag;
        serverBag.getComponentProviders().get().forEach(ComponentProvider::done);
    }

    private static Collection<RankedProvider<ComponentProvider>> getRankedComponentProviders() throws ServiceConfigurationError {
        return StreamSupport.stream(ServiceFinder.find(ComponentProvider.class).spliterator(), false)
                .map(RankedProvider::new)
                .sorted(RANKED_COMPARATOR)
                .collect(Collectors.toList());
    }
}
