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// Portions Copyright [2017-2021] [Payara Foundation and/or its affiliates]

package org.glassfish.ejb.persistent.timer;

import com.sun.ejb.PersistentTimerService;
import com.sun.ejb.containers.EjbContainerUtil;
import com.sun.ejb.containers.EjbContainerUtilImpl;
import com.sun.ejb.containers.EJBTimerService;
import com.sun.enterprise.config.serverbeans.Cluster;
import com.sun.enterprise.config.serverbeans.Domain;
import com.sun.enterprise.config.serverbeans.Server;
import com.sun.enterprise.transaction.api.RecoveryResourceRegistry;
import com.sun.enterprise.transaction.spi.RecoveryEventListener;
import fish.payara.enterprise.config.serverbeans.DeploymentGroup;
import fish.payara.nucleus.cluster.ClusterListener;
import fish.payara.nucleus.cluster.MemberEvent;
import fish.payara.nucleus.cluster.PayaraCluster;

import org.jvnet.hk2.annotations.Service;
import jakarta.inject.Inject;
import org.glassfish.hk2.api.PostConstruct;

import java.util.logging.Logger;
import java.util.logging.Level;
import org.glassfish.api.admin.ServerEnvironment;

@Service
public class DatabaseEJBTimerService
    implements PersistentTimerService, RecoveryEventListener, PostConstruct, ClusterListener {

    private static Logger logger = EjbContainerUtilImpl.getLogger();

    @Inject
    private EjbContainerUtil ejbContainerUtil;

    @Inject
    PayaraCluster cluster;
    
    @Inject
    Domain domain;
    
    @Inject
    ServerEnvironment serverEnv;

    @Inject
    RecoveryResourceRegistry recoveryResourceRegistry;

    public void postConstruct() {
        if (!ejbContainerUtil.isDas()) {
            if (cluster != null && cluster.isEnabled()) {
                cluster.addClusterListener(this);
            }
            // Register for transaction recovery events
            recoveryResourceRegistry.addEventListener(this);
        }
    }

    public void initPersistentTimerService(String target) {
        PersistentEJBTimerService.initEJBTimerService(target);
    }

    @Override
    public void beforeRecovery(boolean delegated, String instance) {}

    @Override
    public void afterRecovery(boolean success, boolean delegated, String instance) {
        if (!delegated) {
            return; // nothing to do
        }

        if (logger.isLoggable(Level.INFO)) {
                logger.log(Level.INFO, "[DistributedEJBTimerService] afterRecovery event for instance {0}", instance);
        }

        if (instance != null && !instance.equals(ejbContainerUtil.getServerEnvironment().getInstanceName())) {
            if (success) {
                migrateTimers(instance);
            } else {
                logger.log(Level.WARNING, "[DistributedEJBTimerService] Cannot perform automatic timer migration after failed transaction recovery");
            }
        }
    }

    /**
     *--------------------------------------------------------------
     * Private methods for DistributedEJBTimerService
     *--------------------------------------------------------------
     */
    private int migrateTimers( String serverId ) {
        if (logger.isLoggable(Level.INFO)) {
            logger.log(Level.INFO, "[DistributedEJBTimerService] migrating timers from {0}", serverId);
        }

        int result = 0;
        // Force loading TimerService if it hadn't been started
        EJBTimerService ejbTimerService = EJBTimerService.getPersistentTimerService();
        if (ejbTimerService != null && ejbTimerService.isPersistent()) {
            result = ejbTimerService.migrateTimers( serverId );
        } else {
            //throw new IllegalStateException("EJB Timer service is null. "
                    //+ "Cannot migrate timers for: " + serverId);
        }
        
        return result;
    }

    @Override
    public void memberAdded(MemberEvent event) {
    }

    @Override
    public void memberRemoved(MemberEvent event) {
        
        // work out whether we should be attempting to migrate timers
        String server = event.getServer();
        String group = event.getServerGroup();
        String thisServer = serverEnv.getInstanceName();
        
        
        // check whether the server is any of the same clusters or deployment groups 
        // as the disappeared server and if so migrate timers
        boolean migrate = false;
        Cluster forServer = domain.getClusterForInstance(server);
        if (forServer != null) {
            for (Server instance : forServer.getInstances()) {
                if (instance.getName().equals(thisServer)) {
                    // if I am in the same cluster
                    migrate = true; 
                    break;
                }
            }
        }
        
        if (!migrate) {
            for (DeploymentGroup deploymentGroup : domain.getDeploymentGroupsForInstance(server)) {
                for (Server instance : deploymentGroup.getInstances()) {
                    if (instance.getName().equals(thisServer)) {
                        // if I am in the same cluster
                        migrate = true; 
                        break;
                    }                    
                }
            }
        }
        
        if (migrate) {
            migrateTimers(event.getServer());
        }
    }

} //DistributedEJBTimerService.java