/**
* 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.
 */
#ifndef IOTDB_SESSIONCONNECTION_H
#define IOTDB_SESSIONCONNECTION_H

#include <memory>
#include <vector>
#include <string>
#include <thrift/transport/TTransport.h>
#if WITH_SSL
#include <thrift/transport/TSSLSocket.h>
#endif

#include "IClientRPCService.h"
#include "common_types.h"
#include "NodesSupplier.h"
#include "Common.h"

class SessionDataSet;
class Session;

class SessionConnection : public std::enable_shared_from_this<SessionConnection> {
public:
  SessionConnection(Session* session_ptr, const TEndPoint& endpoint, const std::string& zoneId,
                    std::shared_ptr<INodesSupplier> nodeSupplier, int fetchSize = 10000,
                    int maxRetries = 3, int64_t retryInterval = 500,
                    int64_t connectionTimeoutMs = 3 * 1000, std::string dialect = "tree",
                    std::string db = "");

  ~SessionConnection();

  void setTimeZone(const std::string& newZoneId);

  const TEndPoint& getEndPoint();

  void init(const TEndPoint& endpoint, bool useSSL, const std::string& trustCertFilePath);

  void insertStringRecord(const TSInsertStringRecordReq& request);

  void insertRecord(const TSInsertRecordReq& request);

  void insertStringRecords(const TSInsertStringRecordsReq& request);

  void insertRecords(const TSInsertRecordsReq& request);

  void insertRecordsOfOneDevice(TSInsertRecordsOfOneDeviceReq request);

  void insertStringRecordsOfOneDevice(TSInsertStringRecordsOfOneDeviceReq request);

  void insertTablet(TSInsertTabletReq request);

  void insertTablets(TSInsertTabletsReq request);

  void testInsertStringRecord(TSInsertStringRecordReq& request);

  void testInsertTablet(TSInsertTabletReq& request);

  void testInsertRecords(TSInsertRecordsReq& request);

  void deleteTimeseries(const vector<string>& paths);

  void deleteData(const TSDeleteDataReq& request);

  void setStorageGroup(const string& storageGroupId);

  void deleteStorageGroups(const vector<string>& storageGroups);

  void createTimeseries(TSCreateTimeseriesReq& req);

  void createMultiTimeseries(TSCreateMultiTimeseriesReq& req);

  void createAlignedTimeseries(TSCreateAlignedTimeseriesReq& req);

  TSGetTimeZoneResp getTimeZone();

  void setTimeZone(TSSetTimeZoneReq& req);

  void createSchemaTemplate(TSCreateSchemaTemplateReq req);

  void setSchemaTemplate(TSSetSchemaTemplateReq req);

  void unsetSchemaTemplate(TSUnsetSchemaTemplateReq req);

  void appendSchemaTemplate(TSAppendSchemaTemplateReq req);

  void pruneSchemaTemplate(TSPruneSchemaTemplateReq req);

  TSQueryTemplateResp querySchemaTemplate(TSQueryTemplateReq req);

  std::unique_ptr<SessionDataSet> executeRawDataQuery(const std::vector<std::string>& paths,
                                                      int64_t startTime, int64_t endTime);

  std::unique_ptr<SessionDataSet> executeLastDataQuery(const std::vector<std::string>& paths,
                                                       int64_t lastTime);

  void executeNonQueryStatement(const std::string& sql);

  std::unique_ptr<SessionDataSet> executeQueryStatement(const std::string& sql,
                                                        int64_t timeoutInMs = -1);

  std::shared_ptr<IClientRPCServiceClient> getSessionClient() {
    return client;
  }

  friend class Session;

private:
  void close();
  std::string getSystemDefaultZoneId();
  bool reconnect();

  template <typename T> struct RetryResult {
    T result;
    std::exception_ptr exception;
    int retryAttempts;

    RetryResult(T r, std::exception_ptr e, int a) : result(r), exception(e), retryAttempts(a) {}

    int getRetryAttempts() const {
      return retryAttempts;
    }
    T getResult() const {
      return result;
    }
    std::exception_ptr getException() const {
      return exception;
    }
  };

  template <typename T> void callWithRetryAndVerifyWithRedirection(std::function<T()> rpc);

  template <typename T>
  void callWithRetryAndVerifyWithRedirectionForMultipleDevices(std::function<T()> rpc,
                                                               const vector<string>& deviceIds);

  template <typename T> RetryResult<T> callWithRetryAndVerify(std::function<T()> rpc);

  template <typename T> RetryResult<T> callWithRetry(std::function<T()> rpc);

  template <typename T, typename RpcFunc> RetryResult<T> callWithRetryAndReconnect(RpcFunc rpc);

  template <typename T, typename RpcFunc, typename StatusGetter>
  RetryResult<T> callWithRetryAndReconnect(RpcFunc rpc, StatusGetter statusGetter);

  template <typename T, typename RpcFunc, typename ShouldRetry, typename ForceReconnect>
  RetryResult<T> callWithRetryAndReconnect(RpcFunc rpc, ShouldRetry shouldRetry,
                                           ForceReconnect forceReconnect);

  TSStatus insertStringRecordInternal(TSInsertStringRecordReq request);

  TSStatus insertRecordInternal(TSInsertRecordReq request);

  TSStatus insertStringRecordsInternal(TSInsertStringRecordsReq request);

  TSStatus insertRecordsInternal(TSInsertRecordsReq request);

  TSStatus insertRecordsOfOneDeviceInternal(TSInsertRecordsOfOneDeviceReq request);

  TSStatus insertStringRecordsOfOneDeviceInternal(TSInsertStringRecordsOfOneDeviceReq request);

  TSStatus insertTabletInternal(TSInsertTabletReq request);

  TSStatus insertTabletsInternal(TSInsertTabletsReq request);

  TSStatus deleteDataInternal(TSDeleteDataReq request);
#if WITH_SSL
  std::shared_ptr<apache::thrift::transport::TSSLSocketFactory> socketFactory_ =
      std::make_shared<apache::thrift::transport::TSSLSocketFactory>();
#endif
  std::shared_ptr<TTransport> transport;
  std::shared_ptr<IClientRPCServiceClient> client;
  Session* session;
  int64_t sessionId;
  int64_t statementId;
  int64_t connectionTimeoutInMs;
  bool enableRPCCompression = false;
  std::string zoneId;
  TEndPoint endPoint;
  std::vector<TEndPoint> endPointList;
  std::shared_ptr<INodesSupplier> availableNodes;
  int fetchSize;
  int maxRetryCount;
  int64_t retryIntervalMs;
  std::string sqlDialect;
  std::string database;
  int timeFactor = 1000;
};

template <typename T>
SessionConnection::RetryResult<T> SessionConnection::callWithRetry(std::function<T()> rpc) {
  std::exception_ptr lastException = nullptr;
  TSStatus status;
  int i;
  for (i = 0; i <= maxRetryCount; i++) {
    if (i > 0) {
      lastException = nullptr;
      status = TSStatus();
      try {
        std::this_thread::sleep_for(std::chrono::milliseconds(retryIntervalMs));
      } catch (const std::exception& e) {
        break;
      }
      if (!reconnect()) {
        continue;
      }
    }

    try {
      status = rpc();
      if (status.__isset.needRetry && status.needRetry) {
        continue;
      }
      break;
    } catch (...) {
      lastException = std::current_exception();
    }
  }
  return {status, lastException, i};
}

template <typename T>
void SessionConnection::callWithRetryAndVerifyWithRedirection(std::function<T()> rpc) {
  auto result = callWithRetry<T>(rpc);

  auto status = result.getResult();
  if (result.getRetryAttempts() == 0) {
    RpcUtils::verifySuccessWithRedirection(status);
  } else {
    RpcUtils::verifySuccess(status);
  }

  if (result.getException()) {
    try {
      std::rethrow_exception(result.getException());
    } catch (const std::exception& e) {
      throw IoTDBConnectionException(e.what());
    }
  }
}

template <typename T>
void SessionConnection::callWithRetryAndVerifyWithRedirectionForMultipleDevices(
    std::function<T()> rpc, const vector<string>& deviceIds) {
  auto result = callWithRetry<T>(rpc);
  auto status = result.getResult();
  if (result.getRetryAttempts() == 0) {
    RpcUtils::verifySuccessWithRedirectionForMultiDevices(status, deviceIds);
  } else {
    RpcUtils::verifySuccess(status);
  }
  if (result.getException()) {
    try {
      std::rethrow_exception(result.getException());
    } catch (const std::exception& e) {
      throw IoTDBConnectionException(e.what());
    }
  }
  result.exception = nullptr;
}

template <typename T>
SessionConnection::RetryResult<T>
SessionConnection::callWithRetryAndVerify(std::function<T()> rpc) {
  auto result = callWithRetry<T>(rpc);
  RpcUtils::verifySuccess(result.getResult());
  if (result.getException()) {
    try {
      std::rethrow_exception(result.getException());
    } catch (const std::exception& e) {
      throw IoTDBConnectionException(e.what());
    }
  }
  return result;
}

template <typename T, typename RpcFunc>
SessionConnection::RetryResult<T> SessionConnection::callWithRetryAndReconnect(RpcFunc rpc) {
  return callWithRetryAndReconnect<T>(
      rpc, [](const TSStatus& status) { return status.__isset.needRetry && status.needRetry; },
      [](const TSStatus& status) {
        return status.code == TSStatusCode::PLAN_FAILED_NETWORK_PARTITION;
      });
}

template <typename T, typename RpcFunc, typename StatusGetter>
SessionConnection::RetryResult<T>
SessionConnection::callWithRetryAndReconnect(RpcFunc rpc, StatusGetter statusGetter) {
  auto shouldRetry = [&statusGetter](const T& t) {
    auto status = statusGetter(t);
    return status.__isset.needRetry && status.needRetry;
  };
  auto forceReconnect = [&statusGetter](const T& t) {
    auto status = statusGetter(t);
    return status.code == TSStatusCode::PLAN_FAILED_NETWORK_PARTITION;
    ;
  };
  return callWithRetryAndReconnect<T>(rpc, shouldRetry, forceReconnect);
}

template <typename T, typename RpcFunc, typename ShouldRetry, typename ForceReconnect>
SessionConnection::RetryResult<T>
SessionConnection::callWithRetryAndReconnect(RpcFunc rpc, ShouldRetry shouldRetry,
                                             ForceReconnect forceReconnect) {
  std::exception_ptr lastException = nullptr;
  T result;
  int retryAttempt;
  for (retryAttempt = 0; retryAttempt <= maxRetryCount; retryAttempt++) {
    try {
      result = rpc();
      lastException = nullptr;
    } catch (...) {
      result = T();
      lastException = std::current_exception();
    }

    if (!shouldRetry(result)) {
      return {result, lastException, retryAttempt};
    }

    if (lastException != nullptr ||
        std::find(availableNodes->getEndPointList().begin(),
                  availableNodes->getEndPointList().end(),
                  this->endPoint) == availableNodes->getEndPointList().end() ||
        forceReconnect(result)) {
      reconnect();
    }

    try {
      std::this_thread::sleep_for(std::chrono::milliseconds(retryIntervalMs));
    } catch (const std::exception& e) {
      log_debug("Thread was interrupted during retry " + std::to_string(retryAttempt) +
                " with wait time " + std::to_string(retryIntervalMs) + " ms. Exiting retry loop.");
      break;
    }
  }

  return {result, lastException, retryAttempt};
}

#endif