/*
 * Copyright (C) 2009-2018 Lightbend Inc. <https://www.lightbend.com>
 */

package jdocs.persistence;

//#plugin-imports
import akka.dispatch.Futures;
import akka.persistence.*;
import akka.persistence.journal.japi.*;
import akka.persistence.snapshot.japi.*;
//#plugin-imports

import akka.actor.*;
import akka.persistence.journal.leveldb.SharedLeveldbJournal;
import akka.persistence.journal.leveldb.SharedLeveldbStore;

import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import scala.concurrent.Future;
import java.util.function.Consumer;
import org.iq80.leveldb.util.FileUtils;
import java.util.Optional;

import akka.persistence.japi.journal.JavaJournalSpec;
import akka.persistence.japi.snapshot.JavaSnapshotStoreSpec;


public class LambdaPersistencePluginDocTest {


  static Object o1 = new Object() {
    final ActorSystem system = null;
    //#shared-store-creation
    final ActorRef store = system.actorOf(Props.create(SharedLeveldbStore.class), "store");
    //#shared-store-creation

    //#shared-store-usage
    class SharedStorageUsage extends AbstractActor {
      @Override
      public void preStart() throws Exception {
        String path = "akka.tcp://example@127.0.0.1:2552/user/store";
        ActorSelection selection = getContext().actorSelection(path);
        selection.tell(new Identify(1), getSelf());
      }

      @Override
      public Receive createReceive() {
        return receiveBuilder()
          .match(ActorIdentity.class, ai -> {
            if (ai.correlationId().equals(1)) {
              Optional<ActorRef> store = ai.getActorRef();
              if (store.isPresent()) {
                SharedLeveldbJournal.setStore(store.get(), getContext().getSystem());
              } else {
                throw new RuntimeException("Couldn't identify store");
              }
            }
          })
          .build();
      }
    }
    //#shared-store-usage
  };

  class MySnapshotStore extends SnapshotStore {
    @Override
    public Future<Optional<SelectedSnapshot>> doLoadAsync(String persistenceId, SnapshotSelectionCriteria criteria) {
      return null;
    }

    @Override
    public Future<Void> doSaveAsync(SnapshotMetadata metadata, Object snapshot) {
      return null;
    }

    @Override
    public Future<Void> doDeleteAsync(SnapshotMetadata metadata) {
      return Futures.successful(null);
    }

    @Override
    public Future<Void> doDeleteAsync(String persistenceId, SnapshotSelectionCriteria criteria) {
      return Futures.successful(null);
    }
  }

  class MyAsyncJournal extends AsyncWriteJournal {
    //#sync-journal-plugin-api
    @Override
    public Future<Iterable<Optional<Exception>>> doAsyncWriteMessages(
        Iterable<AtomicWrite> messages) {
      try {
        Iterable<Optional<Exception>> result = new ArrayList<Optional<Exception>>();
        // blocking call here...
        // result.add(..)
        return Futures.successful(result);
      } catch (Exception e) {
        return Futures.failed(e);
      }
    }
    //#sync-journal-plugin-api

    @Override
    public Future<Void> doAsyncDeleteMessagesTo(String persistenceId, long toSequenceNr) {
      return null;
    }

    @Override
    public Future<Void> doAsyncReplayMessages(String persistenceId, long fromSequenceNr,
                                              long toSequenceNr,
                                              long max,
                                              Consumer<PersistentRepr> replayCallback) {
      return null;
    }

    @Override
    public Future<Long> doAsyncReadHighestSequenceNr(String persistenceId, long fromSequenceNr) {
      return null;
    }
  }
  
  static Object o2 = new Object() {
    //#journal-tck-java
    class MyJournalSpecTest extends JavaJournalSpec {

      public MyJournalSpecTest() {
        super(ConfigFactory.parseString(
          "persistence.journal.plugin = " +
            "\"akka.persistence.journal.leveldb-shared\""));
      }

      @Override
      public CapabilityFlag supportsRejectingNonSerializableObjects() {
        return CapabilityFlag.off();
      }
    }
    //#journal-tck-java
  };

  static Object o3 = new Object() {
    //#snapshot-store-tck-java
    class MySnapshotStoreTest extends JavaSnapshotStoreSpec {

      public MySnapshotStoreTest() {
        super(ConfigFactory.parseString(
          "akka.persistence.snapshot-store.plugin = " +
            "\"akka.persistence.snapshot-store.local\""));
      }
    }
    //#snapshot-store-tck-java
  };

  static Object o4 = new Object() {
    //#journal-tck-before-after-java
    class MyJournalSpecTest extends JavaJournalSpec {

      List<File> storageLocations = new ArrayList<File>();

      public MyJournalSpecTest() {
        super(ConfigFactory.parseString(
          "persistence.journal.plugin = " +
            "\"akka.persistence.journal.leveldb-shared\""));

        Config config = system().settings().config();
        storageLocations.add(new File(
          config.getString("akka.persistence.journal.leveldb.dir")));
        storageLocations.add(new File(
          config.getString("akka.persistence.snapshot-store.local.dir")));
      }


      @Override
      public CapabilityFlag supportsRejectingNonSerializableObjects() {
        return CapabilityFlag.on();
      }

      @Override
      public void beforeAll() {
        for (File storageLocation : storageLocations) {
          FileUtils.deleteRecursively(storageLocation);
        }
        super.beforeAll();
      }

      @Override
      public void afterAll() {
        super.afterAll();
        for (File storageLocation : storageLocations) {
          FileUtils.deleteRecursively(storageLocation);
        }
      }
    }
    //#journal-tck-before-after-java
  };

}
