/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.confignode.manager.pipe.event;

import org.apache.iotdb.commons.pipe.agent.task.meta.PipeTaskMeta;
import org.apache.iotdb.commons.pipe.datastructure.pattern.TablePattern;
import org.apache.iotdb.commons.pipe.datastructure.pattern.TreePattern;
import org.apache.iotdb.commons.pipe.event.EnrichedEvent;
import org.apache.iotdb.commons.pipe.event.PipeSnapshotEvent;
import org.apache.iotdb.commons.pipe.resource.ref.PipePhantomReferenceManager.PipeEventResource;
import org.apache.iotdb.commons.pipe.resource.snapshot.PipeSnapshotResourceManager;
import org.apache.iotdb.confignode.consensus.request.ConfigPhysicalPlanType;
import org.apache.iotdb.confignode.manager.pipe.resource.PipeConfigNodeResourceManager;
import org.apache.iotdb.confignode.persistence.schema.CNSnapshotFileType;
import org.apache.iotdb.db.pipe.event.ReferenceTrackableEvent;

import org.apache.tsfile.utils.ReadWriteIOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

public class PipeConfigRegionSnapshotEvent extends PipeSnapshotEvent
    implements ReferenceTrackableEvent {

  private static final Logger LOGGER = LoggerFactory.getLogger(PipeConfigRegionSnapshotEvent.class);
  private String snapshotPath;
  // This will only be filled in when the snapshot is a schema info file.
  private String templateFilePath;
  private static final Map<CNSnapshotFileType, Set<Short>>
      SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP = new EnumMap<>(CNSnapshotFileType.class);
  private CNSnapshotFileType fileType;

  static {
    SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP.put(
        CNSnapshotFileType.ROLE,
        Collections.unmodifiableSet(
            new HashSet<>(
                Arrays.asList(
                    ConfigPhysicalPlanType.CreateRole.getPlanType(),
                    ConfigPhysicalPlanType.GrantRole.getPlanType(),
                    ConfigPhysicalPlanType.RGrantRoleDBPriv.getPlanType(),
                    ConfigPhysicalPlanType.RGrantRoleTBPriv.getPlanType(),
                    ConfigPhysicalPlanType.RGrantRoleAny.getPlanType(),
                    ConfigPhysicalPlanType.RGrantRoleSysPri.getPlanType(),
                    ConfigPhysicalPlanType.RGrantRoleAll.getPlanType()))));
    SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP.put(
        CNSnapshotFileType.USER,
        Collections.unmodifiableSet(
            new HashSet<>(
                Arrays.asList(
                    ConfigPhysicalPlanType.CreateUserWithRawPassword.getPlanType(),
                    ConfigPhysicalPlanType.GrantUser.getPlanType(),
                    ConfigPhysicalPlanType.RGrantUserDBPriv.getPlanType(),
                    ConfigPhysicalPlanType.RGrantUserTBPriv.getPlanType(),
                    ConfigPhysicalPlanType.RGrantUserAny.getPlanType(),
                    ConfigPhysicalPlanType.RGrantUserSysPri.getPlanType(),
                    ConfigPhysicalPlanType.RGrantUserAll.getPlanType()))));
    SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP.put(
        CNSnapshotFileType.USER_ROLE,
        Collections.singleton(ConfigPhysicalPlanType.GrantRoleToUser.getPlanType()));
    SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP.put(
        CNSnapshotFileType.SCHEMA,
        Collections.unmodifiableSet(
            new HashSet<>(
                Arrays.asList(
                    ConfigPhysicalPlanType.CreateDatabase.getPlanType(),
                    ConfigPhysicalPlanType.CreateSchemaTemplate.getPlanType(),
                    ConfigPhysicalPlanType.CommitSetSchemaTemplate.getPlanType(),
                    ConfigPhysicalPlanType.PipeCreateTable.getPlanType()))));
    SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP.put(
        CNSnapshotFileType.TTL, Collections.singleton(ConfigPhysicalPlanType.SetTTL.getPlanType()));
  }

  public PipeConfigRegionSnapshotEvent() {
    // Used for deserialization
    this(null, null, null);
  }

  public PipeConfigRegionSnapshotEvent(
      final String snapshotPath, final String templateFilePath, final CNSnapshotFileType type) {
    this(snapshotPath, templateFilePath, type, null, 0, null, null, null, null, true);
  }

  public PipeConfigRegionSnapshotEvent(
      final String snapshotPath,
      final String templateFilePath,
      final CNSnapshotFileType type,
      final String pipeName,
      final long creationTime,
      final PipeTaskMeta pipeTaskMeta,
      final TreePattern treePattern,
      final TablePattern tablePattern,
      final String userName,
      final boolean skipIfNoPrivileges) {
    super(
        pipeName,
        creationTime,
        pipeTaskMeta,
        treePattern,
        tablePattern,
        userName,
        skipIfNoPrivileges,
        PipeConfigNodeResourceManager.snapshot());
    this.snapshotPath = snapshotPath;
    this.templateFilePath = Objects.nonNull(templateFilePath) ? templateFilePath : "";
    this.fileType = type;
  }

  public File getSnapshotFile() {
    return new File(snapshotPath);
  }

  public File getTemplateFile() {
    return !templateFilePath.isEmpty() ? new File(templateFilePath) : null;
  }

  public CNSnapshotFileType getFileType() {
    return fileType;
  }

  @Override
  public boolean internallyIncreaseResourceReferenceCount(final String holderMessage) {
    try {
      snapshotPath = resourceManager.increaseSnapshotReference(snapshotPath);
      if (!templateFilePath.isEmpty()) {
        templateFilePath = resourceManager.increaseSnapshotReference(templateFilePath);
      }
      return true;
    } catch (final Exception e) {
      LOGGER.warn(
          String.format(
              "Increase reference count for snapshot %s error. Holder Message: %s",
              snapshotPath, holderMessage),
          e);
      return false;
    }
  }

  @Override
  public boolean internallyDecreaseResourceReferenceCount(final String holderMessage) {
    try {
      resourceManager.decreaseSnapshotReference(snapshotPath);
      if (!templateFilePath.isEmpty()) {
        resourceManager.decreaseSnapshotReference(templateFilePath);
      }
      return true;
    } catch (final Exception e) {
      LOGGER.warn(
          String.format(
              "Decrease reference count for snapshot %s error. Holder Message: %s",
              snapshotPath, holderMessage),
          e);
      return false;
    }
  }

  @Override
  public EnrichedEvent shallowCopySelfAndBindPipeTaskMetaForProgressReport(
      final String pipeName,
      final long creationTime,
      final PipeTaskMeta pipeTaskMeta,
      final TreePattern treePattern,
      final TablePattern tablePattern,
      final String userName,
      final boolean skipIfNoPrivileges,
      final long startTime,
      final long endTime) {
    return new PipeConfigRegionSnapshotEvent(
        snapshotPath,
        templateFilePath,
        fileType,
        pipeName,
        creationTime,
        pipeTaskMeta,
        treePattern,
        tablePattern,
        userName,
        skipIfNoPrivileges);
  }

  @Override
  public ByteBuffer serializeToByteBuffer() {
    final ByteBuffer result =
        ByteBuffer.allocate(
            2 * Byte.BYTES
                + 2 * Integer.BYTES
                + snapshotPath.getBytes().length
                + templateFilePath.getBytes().length);
    ReadWriteIOUtils.write(PipeConfigSerializableEventType.CONFIG_SNAPSHOT.getType(), result);
    ReadWriteIOUtils.write(fileType.getType(), result);
    ReadWriteIOUtils.write(snapshotPath, result);
    ReadWriteIOUtils.write(templateFilePath, result);
    return result;
  }

  @Override
  public void deserializeFromByteBuffer(final ByteBuffer buffer) {
    fileType = CNSnapshotFileType.deserialize(ReadWriteIOUtils.readByte(buffer));
    snapshotPath = ReadWriteIOUtils.readString(buffer);
    templateFilePath = ReadWriteIOUtils.readString(buffer);
  }

  /////////////////////////////// Type parsing ///////////////////////////////

  public static boolean needTransferSnapshot(final Set<ConfigPhysicalPlanType> listenedTypeSet) {
    final Set<Short> types =
        SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP.values().stream()
            .flatMap(Collection::stream)
            .collect(Collectors.toSet());
    types.retainAll(
        listenedTypeSet.stream()
            .map(ConfigPhysicalPlanType::getPlanType)
            .collect(Collectors.toSet()));
    return !types.isEmpty();
  }

  public void confineTransferredTypes(final Set<ConfigPhysicalPlanType> listenedTypeSet) {
    final Set<Short> types =
        new HashSet<>(SNAPSHOT_FILE_TYPE_2_CONFIG_PHYSICAL_PLAN_TYPE_MAP.get(fileType));
    types.retainAll(
        listenedTypeSet.stream()
            .map(ConfigPhysicalPlanType::getPlanType)
            .collect(Collectors.toSet()));
    transferredTypes = types;
  }

  public static Set<ConfigPhysicalPlanType> getConfigPhysicalPlanTypeSet(final String sealTypes) {
    return sealTypes.isEmpty()
        ? Collections.emptySet()
        : Arrays.stream(sealTypes.split(","))
            .map(
                typeValue ->
                    ConfigPhysicalPlanType.convertToConfigPhysicalPlanType(
                        Short.parseShort(typeValue)))
            .collect(Collectors.toSet());
  }

  /////////////////////////////// Object ///////////////////////////////

  @Override
  public String toString() {
    return String.format(
            "PipeConfigRegionSnapshotEvent{snapshotPath=%s, templateFilePath=%s, fileType=%s}",
            snapshotPath, templateFilePath, fileType)
        + " - "
        + super.toString();
  }

  @Override
  public String coreReportMessage() {
    return String.format(
            "PipeConfigRegionSnapshotEvent{snapshotPath=%s, templateFilePath=%s, fileType=%s}",
            snapshotPath, templateFilePath, fileType)
        + " - "
        + super.coreReportMessage();
  }

  /////////////////////////// ReferenceTrackableEvent ///////////////////////////

  @Override
  protected void trackResource() {
    PipeConfigNodeResourceManager.ref().trackPipeEventResource(this, eventResourceBuilder());
  }

  @Override
  public PipeEventResource eventResourceBuilder() {
    return new PipeConfigRegionSnapshotEventResource(
        this.isReleased,
        this.referenceCount,
        this.resourceManager,
        this.snapshotPath,
        this.templateFilePath);
  }

  private static class PipeConfigRegionSnapshotEventResource extends PipeEventResource {

    private final PipeSnapshotResourceManager resourceManager;
    private final String snapshotPath;
    private final String templateFilePath;

    private PipeConfigRegionSnapshotEventResource(
        final AtomicBoolean isReleased,
        final AtomicInteger referenceCount,
        final PipeSnapshotResourceManager resourceManager,
        final String snapshotPath,
        final String templateFilePath) {
      super(isReleased, referenceCount);
      this.resourceManager = resourceManager;
      this.snapshotPath = snapshotPath;
      this.templateFilePath = templateFilePath;
    }

    @Override
    protected void finalizeResource() {
      try {
        resourceManager.decreaseSnapshotReference(snapshotPath);
        if (!templateFilePath.isEmpty()) {
          resourceManager.decreaseSnapshotReference(templateFilePath);
        }
      } catch (final Exception e) {
        LOGGER.warn("Decrease reference count for snapshot {} error.", snapshotPath, e);
      }
    }
  }
}
