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/*
 *
 *  * Copyright 2024 Responsive Computing, Inc.
 *  *
 *  * Licensed 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 dev.responsive.kafka.internal.db;

import com.mongodb.MongoBulkWriteException;
import com.mongodb.MongoException;
import com.mongodb.bulk.WriteConcernError;
import com.mongodb.client.MongoCollection;
import dev.responsive.kafka.internal.db.mongo.KVDoc;
import dev.responsive.kafka.internal.db.mongo.MongoKVTable;
import dev.responsive.kafka.internal.db.mongo.MongoWriter;
import dev.responsive.kafka.internal.db.partitioning.TablePartitioner;
import dev.responsive.kafka.internal.stores.RemoteWriteResult;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.LogContext;
import org.slf4j.Logger;

public class MongoKVFlushManager extends KVFlushManager {
  private final String logPrefix;
  private final Logger log;

  private final MongoKVTable table;
  private final MongoCollection kvDocs;

  private final TablePartitioner partitioner;
  private final int kafkaPartition;

  public MongoKVFlushManager(
      final MongoKVTable table,
      final MongoCollection kvDocs,
      final int kafkaPartition,
      final TablePartitioner partitioner
  ) {
    this.table = table;
    this.kvDocs = kvDocs;
    this.kafkaPartition = kafkaPartition;
    this.partitioner = partitioner;

    logPrefix = String.format("%s[%d] kv-store {epoch=%d} ",
                              table.name(), kafkaPartition, table.localEpoch(kafkaPartition));
    log = new LogContext(logPrefix).logger(MongoKVFlushManager.class);
  }

  @Override
  public String tableName() {
    return table.name();
  }

  @Override
  public TablePartitioner partitioner() {
    return partitioner;
  }

  @Override
  public RemoteWriter createWriter(final Integer tablePartition) {
    return new MongoWriter<>(table, kafkaPartition, tablePartition, () -> kvDocs);
  }

  @Override
  public String failedFlushInfo(final long batchOffset, final Integer failedTablePartition) {
    return String.format(", ",
                         batchOffset, table.fetchOffset(kafkaPartition),
                         table.localEpoch(kafkaPartition), table.fetchEpoch(kafkaPartition));
  }

  @Override
  public RemoteWriteResult updateOffset(final long consumedOffset) {
    try {
      // TODO: should we check result.wasAcknowledged()/use a write concern?
      table.setOffset(kafkaPartition, consumedOffset);
    } catch (final MongoBulkWriteException e) {
      log.warn("Bulk write operation failed", e);
      final WriteConcernError writeConcernError = e.getWriteConcernError();
      if (writeConcernError != null) {
        log.warn("Bulk write operation failed due to write concern error {}", writeConcernError);
      } else {
        log.warn("Bulk write operation failed due to error(s): {}", e.getWriteErrors());
      }
      return RemoteWriteResult.failure(kafkaPartition);
    } catch (final MongoException e) {
      log.error("Unexpected exception running the bulk write operation", e);
      throw new RuntimeException("Bulk write operation failed", e);
    }
    return RemoteWriteResult.success(kafkaPartition);
  }

  @Override
  public String logPrefix() {
    return logPrefix;
  }
}