package org.jboss.as.ee.concurrent.deployers;

import org.jboss.as.controller.capability.CapabilityServiceSupport;
import org.jboss.as.ee.component.Attachments;
import org.jboss.as.ee.component.ComponentConfiguration;
import org.jboss.as.ee.component.ComponentConfigurator;
import org.jboss.as.ee.component.ComponentDescription;
import org.jboss.as.ee.component.ComponentNamingMode;
import org.jboss.as.ee.component.EEModuleDescription;
import org.jboss.as.ee.component.interceptors.InterceptorOrder;
import org.jboss.as.ee.concurrent.ConcurrentContext;
import org.jboss.as.ee.concurrent.ConcurrentContextInterceptor;
import org.jboss.as.ee.concurrent.ConcurrentContextSetupAction;
import org.jboss.as.ee.concurrent.handle.ClassLoaderContextHandleFactory;
import org.jboss.as.ee.concurrent.handle.ContextHandleFactory;
import org.jboss.as.ee.concurrent.handle.NamingContextHandleFactory;
import org.jboss.as.ee.concurrent.handle.OtherEESetupActionsContextHandleFactory;
import org.jboss.as.ee.concurrent.handle.ThreadContextProviderContextHandleFactory;
import org.jboss.as.ee.concurrent.handle.TransactionContextHandleFactory;
import org.jboss.as.ee.concurrent.service.ConcurrentContextService;
import org.jboss.as.ee.concurrent.service.ConcurrentServiceNames;
import org.jboss.as.ee.structure.DeploymentType;
import org.jboss.as.ee.structure.DeploymentTypeMarker;
import org.jboss.as.naming.context.NamespaceContextSelector;
import org.jboss.as.server.deployment.DeploymentPhaseContext;
import org.jboss.as.server.deployment.DeploymentUnit;
import org.jboss.as.server.deployment.DeploymentUnitProcessingException;
import org.jboss.as.server.deployment.DeploymentUnitProcessor;
import org.jboss.invocation.ImmediateInterceptorFactory;
import org.jboss.invocation.InterceptorFactory;
import org.jboss.msc.service.ServiceBuilder;
import org.jboss.msc.service.ServiceName;
import org.jboss.msc.service.ServiceTarget;

import java.util.Collection;

import static org.jboss.as.server.deployment.Attachments.MODULE;

/**
 * The DUP responsible for the base concurrent context configuration setup.
 *
 * @author Eduardo Martins
 */
public class EEConcurrentContextProcessor implements DeploymentUnitProcessor {

    /**
     * Name of the capability that ensures a local provider of transactions is present.
     * Once its service is started, calls to the getInstance() methods of ContextTransactionManager,
     * ContextTransactionSynchronizationRegistry and LocalUserTransaction can be made knowing
     * that the global default TM, TSR and UT will be from that provider.
     */
    private static final String LOCAL_TRANSACTION_PROVIDER_CAPABILITY = "org.wildfly.transactions.global-default-local-provider";

    @Override
    public void deploy(DeploymentPhaseContext phaseContext) throws DeploymentUnitProcessingException {
        final DeploymentUnit deploymentUnit = phaseContext.getDeploymentUnit();
        if (DeploymentTypeMarker.isType(DeploymentType.EAR, deploymentUnit)) {
            return;
        }
        final EEModuleDescription eeModuleDescription = deploymentUnit.getAttachment(Attachments.EE_MODULE_DESCRIPTION);
        if(eeModuleDescription == null) {
            return;
        }
        final CapabilityServiceSupport capabilityServiceSupport = phaseContext.getDeploymentUnit().getAttachment(org.jboss.as.server.deployment.Attachments.CAPABILITY_SERVICE_SUPPORT);
        final ServiceName localTransactionProviderCapabilityServiceName = capabilityServiceSupport.hasCapability(LOCAL_TRANSACTION_PROVIDER_CAPABILITY) ? capabilityServiceSupport.getCapabilityServiceName(LOCAL_TRANSACTION_PROVIDER_CAPABILITY) : null;

        processModuleDescription(eeModuleDescription, deploymentUnit, phaseContext, localTransactionProviderCapabilityServiceName);
        final Collection<ComponentDescription> componentDescriptions = eeModuleDescription.getComponentDescriptions();
        if (componentDescriptions == null) {
            return;
        }
        for (ComponentDescription componentDescription : componentDescriptions) {
            if (componentDescription.getNamingMode() == ComponentNamingMode.NONE) {
                // skip components without namespace
                continue;
            }
            processComponentDescription(componentDescription, localTransactionProviderCapabilityServiceName);
        }
    }

    private void processModuleDescription(final EEModuleDescription moduleDescription, DeploymentUnit deploymentUnit, DeploymentPhaseContext phaseContext, ServiceName localTransactionProviderCapabilityServiceName) {
        final ConcurrentContext concurrentContext = moduleDescription.getConcurrentContext();
        // setup context
        setupConcurrentContext(concurrentContext, moduleDescription.getApplicationName(), moduleDescription.getModuleName(), null, deploymentUnit.getAttachment(MODULE).getClassLoader(), moduleDescription.getNamespaceContextSelector(), deploymentUnit, phaseContext.getServiceTarget(), localTransactionProviderCapabilityServiceName);
        // attach setup action
        final ConcurrentContextSetupAction setupAction = new ConcurrentContextSetupAction(concurrentContext);
        deploymentUnit.putAttachment(Attachments.CONCURRENT_CONTEXT_SETUP_ACTION, setupAction);
        deploymentUnit.addToAttachmentList(Attachments.WEB_SETUP_ACTIONS, setupAction);
    }

    private void processComponentDescription(final ComponentDescription componentDescription, ServiceName localTransactionProviderCapabilityServiceName) {
        final ComponentConfigurator componentConfigurator = new ComponentConfigurator() {
            @Override
            public void configure(DeploymentPhaseContext context, ComponentDescription description, final ComponentConfiguration configuration) throws DeploymentUnitProcessingException {
                final ConcurrentContext concurrentContext = configuration.getConcurrentContext();
                // setup context
                setupConcurrentContext(concurrentContext, description.getApplicationName(), description.getModuleName(), description.getComponentName(), configuration.getModuleClassLoader(), configuration.getNamespaceContextSelector(), context.getDeploymentUnit(), context.getServiceTarget(), localTransactionProviderCapabilityServiceName);
                // add the interceptor which manages the concurrent context
                final ConcurrentContextInterceptor interceptor = new ConcurrentContextInterceptor(concurrentContext);
                final InterceptorFactory interceptorFactory = new ImmediateInterceptorFactory(interceptor);
                configuration.addPostConstructInterceptor(interceptorFactory, InterceptorOrder.ComponentPostConstruct.CONCURRENT_CONTEXT);
                configuration.addPreDestroyInterceptor(interceptorFactory, InterceptorOrder.ComponentPreDestroy.CONCURRENT_CONTEXT);
                if (description.isPassivationApplicable()) {
                    configuration.addPrePassivateInterceptor(interceptorFactory, InterceptorOrder.ComponentPassivation.CONCURRENT_CONTEXT);
                    configuration.addPostActivateInterceptor(interceptorFactory, InterceptorOrder.ComponentPassivation.CONCURRENT_CONTEXT);
                }
                configuration.addComponentInterceptor(interceptorFactory, InterceptorOrder.Component.CONCURRENT_CONTEXT, false);
            }
        };
        componentDescription.getConfigurators().add(componentConfigurator);
    }

    /**
     *
     * @param concurrentContext
     * @param applicationName
     * @param moduleName
     * @param componentName
     * @param moduleClassLoader
     * @param namespaceContextSelector
     * @param deploymentUnit
     * @param serviceTarget
     * @param localTransactionProviderCapabilityServiceName the service name of the local tx provider capability. If not present this param should be null
     */
    private void setupConcurrentContext(ConcurrentContext concurrentContext, String applicationName, String moduleName, String componentName, ClassLoader moduleClassLoader, NamespaceContextSelector namespaceContextSelector, DeploymentUnit deploymentUnit, ServiceTarget serviceTarget, ServiceName localTransactionProviderCapabilityServiceName) {
        // add default factories
        concurrentContext.addFactory(new NamingContextHandleFactory(namespaceContextSelector, deploymentUnit.getServiceName()));
        concurrentContext.addFactory(new ClassLoaderContextHandleFactory(moduleClassLoader));
        for(ContextHandleFactory factory : deploymentUnit.getAttachmentList(Attachments.ADDITIONAL_FACTORIES)) {
            concurrentContext.addFactory(factory);
        }
        concurrentContext.addFactory(new OtherEESetupActionsContextHandleFactory(deploymentUnit.getAttachmentList(Attachments.OTHER_EE_SETUP_ACTIONS)));
        // only add tx related factories if the capability is present
        if (localTransactionProviderCapabilityServiceName != null) {
            concurrentContext.addFactory(new TransactionContextHandleFactory());
        }
        // add factories for deployment provided thread context providers
        for (ContextHandleFactory contextHandleFactory : ThreadContextProviderContextHandleFactory.fromServiceLoader(moduleClassLoader)) {
            concurrentContext.addFactory(contextHandleFactory);
        }
        final ConcurrentContextService service = new ConcurrentContextService(concurrentContext);
        final ServiceName serviceName = ConcurrentServiceNames.getConcurrentContextServiceName(applicationName, moduleName, componentName);
        final ServiceBuilder serviceBuilder = serviceTarget.addService(serviceName, service);
        if (localTransactionProviderCapabilityServiceName != null) {
            serviceBuilder.requires(localTransactionProviderCapabilityServiceName);
        }
        serviceBuilder.install();
    }

    @Override
    public void undeploy(DeploymentUnit deploymentUnit) {
        if (DeploymentTypeMarker.isType(DeploymentType.EAR, deploymentUnit)) {
            return;
        }
        ConcurrentContextSetupAction action = deploymentUnit.removeAttachment(Attachments.CONCURRENT_CONTEXT_SETUP_ACTION);
        if (action != null) {
            deploymentUnit.getAttachmentList(Attachments.WEB_SETUP_ACTIONS).remove(action);
        }
    }
}
