// 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.

#include "jni_reader.h"

#include <glog/logging.h>

#include <map>

#include <ostream>

#include <sstream>

#include "core/block/block.h"

#include "core/types.h"

#include "format/jni/jni_data_bridge.h"

#include "runtime/descriptors.h"

#include "runtime/runtime_state.h"

#include "util/jni-util.h"

namespace doris {

class RuntimeProfile;

class RuntimeState;

class Block;

} // namespace doris

namespace doris {

const std::vector<SlotDescriptor*> JniReader::_s_empty_slot_descs;

// =========================================================================

// JniReader constructors

// =========================================================================

JniReader::JniReader(const std::vector<SlotDescriptor*>& file_slot_descs, RuntimeState* state,

                     RuntimeProfile* profile, std::string connector_class,

                     std::map<std::string, std::string> scanner_params,

                     std::vector<std::string> column_names, int64_t self_split_weight)

        : _file_slot_descs(file_slot_descs),

          _state(state),

          _profile(profile),

          _connector_class(std::move(connector_class)),

          _scanner_params(std::move(scanner_params)),

          _column_names(std::move(column_names)),

          _self_split_weight(static_cast<int32_t>(self_split_weight)) {

    _connector_name = split(_connector_class, "/").back();

}

JniReader::JniReader(std::string connector_class, std::map<std::string, std::string> scanner_params)

        : _file_slot_descs(_s_empty_slot_descs),

          _connector_class(std::move(connector_class)),

          _scanner_params(std::move(scanner_params)) {

    _is_table_schema = true;

    _connector_name = split(_connector_class, "/").back();

}

// =========================================================================

// JniReader::open  (merged from JniConnector::open)

// =========================================================================

Status JniReader::open(RuntimeState* state, RuntimeProfile* profile) {

    _state = state;

    _profile = profile;

    if (_profile) {

        ADD_TIMER(_profile, _connector_name.c_str());

        _open_scanner_time = ADD_CHILD_TIMER(_profile, "OpenScannerTime", _connector_name.c_str());

        _java_scan_time = ADD_CHILD_TIMER(_profile, "JavaScanTime", _connector_name.c_str());

        _java_append_data_time =

                ADD_CHILD_TIMER(_profile, "JavaAppendDataTime", _connector_name.c_str());

        _java_create_vector_table_time =

                ADD_CHILD_TIMER(_profile, "JavaCreateVectorTableTime", _connector_name.c_str());

        _fill_block_time = ADD_CHILD_TIMER(_profile, "FillBlockTime", _connector_name.c_str());

        _max_time_split_weight_counter = _profile->add_conditition_counter(

                "MaxTimeSplitWeight", TUnit::UNIT, [](int64_t _c, int64_t c) { return c > _c; },

                _connector_name.c_str());

    }

    _java_scan_watcher = 0;

    JNIEnv* env = nullptr;

    int batch_size = 0;

    if (!_is_table_schema && _state) {

        batch_size = _state->batch_size();

    }

    _batch_size = batch_size;

    RETURN_IF_ERROR(Jni::Env::Get(&env));

    SCOPED_RAW_TIMER(&_jni_scanner_open_watcher);

    if (_state) {

        _scanner_params.emplace("time_zone", _state->timezone());

    }

    RETURN_IF_ERROR(_init_jni_scanner(env, batch_size));

    // Call org.apache.doris.common.jni.JniScanner#open

    RETURN_IF_ERROR(_jni_scanner_obj.call_void_method(env, _jni_scanner_open).call());

    RETURN_ERROR_IF_EXC(env);

    _scanner_opened = true;

    return Status::OK();

}

// =========================================================================

// JniReader::_do_get_next_block  (merged from JniConnector::get_next_block)

// =========================================================================

Status JniReader::_do_get_next_block(Block* block, size_t* read_rows, bool* eof) {

    JNIEnv* env = nullptr;

    RETURN_IF_ERROR(Jni::Env::Get(&env));

    long meta_address = 0;

    {

        SCOPED_RAW_TIMER(&_java_scan_watcher);

        RETURN_IF_ERROR(_jni_scanner_obj.call_long_method(env, _jni_scanner_get_next_batch)

                                .call(&meta_address));

    }

    if (meta_address == 0) {

        *read_rows = 0;

        *eof = true;

        return Status::OK();

    }

    _set_meta(meta_address);

    long num_rows = _table_meta.next_meta_as_long();

    if (num_rows == 0) {

        *read_rows = 0;

        *eof = true;

        return Status::OK();

    }

    RETURN_IF_ERROR(_fill_block(block, num_rows));

    *read_rows = num_rows;

    *eof = false;

    RETURN_IF_ERROR(_jni_scanner_obj.call_void_method(env, _jni_scanner_release_table).call());

    _has_read += num_rows;

    return Status::OK();

}

// =========================================================================

// JniReader::get_table_schema  (merged from JniConnector::get_table_schema)

// =========================================================================

Status JniReader::get_table_schema(std::string& table_schema_str) {

    JNIEnv* env = nullptr;

    RETURN_IF_ERROR(Jni::Env::Get(&env));

    Jni::LocalString jstr;

    RETURN_IF_ERROR(

            _jni_scanner_obj.call_object_method(env, _jni_scanner_get_table_schema).call(&jstr));

    Jni::LocalStringBufferGuard cstr;

    RETURN_IF_ERROR(jstr.get_string_chars(env, &cstr));

    table_schema_str = std::string {cstr.get()};

    return Status::OK();

}

// =========================================================================

// JniReader::close  (merged from JniConnector::close)

// =========================================================================

Status JniReader::close() {

    if (!_closed) {

        _closed = true;

        JNIEnv* env = nullptr;

        RETURN_IF_ERROR(Jni::Env::Get(&env));

        if (_scanner_opened) {

            if (_profile) {

                COUNTER_UPDATE(_open_scanner_time, _jni_scanner_open_watcher);

                COUNTER_UPDATE(_fill_block_time, _fill_block_watcher);

            }

            RETURN_ERROR_IF_EXC(env);

            jlong _append = 0;

            RETURN_IF_ERROR(

                    _jni_scanner_obj.call_long_method(env, _jni_scanner_get_append_data_time)

                            .call(&_append));

            if (_profile) {

                COUNTER_UPDATE(_java_append_data_time, _append);

            }

            jlong _create = 0;

            RETURN_IF_ERROR(

                    _jni_scanner_obj

                            .call_long_method(env, _jni_scanner_get_create_vector_table_time)

                            .call(&_create));

            if (_profile) {

                COUNTER_UPDATE(_java_create_vector_table_time, _create);

                COUNTER_UPDATE(_java_scan_time, _java_scan_watcher - _append - _create);

                _max_time_split_weight_counter->conditional_update(

                        _jni_scanner_open_watcher + _fill_block_watcher + _java_scan_watcher,

                        _self_split_weight);

            }

            // _fill_block may be failed and returned, we should release table in close.

            // org.apache.doris.common.jni.JniScanner#releaseTable is idempotent

            RETURN_IF_ERROR(

                    _jni_scanner_obj.call_void_method(env, _jni_scanner_release_table).call());

            RETURN_IF_ERROR(_jni_scanner_obj.call_void_method(env, _jni_scanner_close).call());

        }

    }

    return Status::OK();

}

// =========================================================================

// JniReader::set_batch_size

// =========================================================================

void JniReader::set_batch_size(size_t batch_size) {

    DCHECK_GT(batch_size, 0);

    if (_batch_size == batch_size) {

        return;

    }

    _batch_size = batch_size;

    if (_scanner_opened) {

        JNIEnv* env = nullptr;

        Status st = Jni::Env::Get(&env);

        if (!st) {

            LOG(WARNING) << "failed to get jni env when set_batch_size: " << st;

            return;

        }

        st = _jni_scanner_obj.call_void_method(env, _jni_scanner_set_batch_size)

                     .with_arg(static_cast<int>(_batch_size))

                     .call();

        if (!st) {

            LOG(WARNING) << "failed to call setBatchSize: " << st;

        }

    }

}

// =========================================================================

// JniReader::_init_jni_scanner  (merged from JniConnector::_init_jni_scanner)

// =========================================================================

Status JniReader::_init_jni_scanner(JNIEnv* env, int batch_size) {

    RETURN_IF_ERROR(

            Jni::Util::get_jni_scanner_class(env, _connector_class.c_str(), &_jni_scanner_cls));

    Jni::MethodId scanner_constructor;

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "<init>", "(ILjava/util/Map;)V",

                                                &scanner_constructor));

    // prepare constructor parameters

    Jni::LocalObject hashmap_object;

    RETURN_IF_ERROR(Jni::Util::convert_to_java_map(env, _scanner_params, &hashmap_object));

    RETURN_IF_ERROR(_jni_scanner_cls.new_object(env, scanner_constructor)

                            .with_arg(batch_size)

                            .with_arg(hashmap_object)

                            .call(&_jni_scanner_obj));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "open", "()V", &_jni_scanner_open));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "getNextBatchMeta", "()J",

                                                &_jni_scanner_get_next_batch));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "getAppendDataTime", "()J",

                                                &_jni_scanner_get_append_data_time));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "getCreateVectorTableTime", "()J",

                                                &_jni_scanner_get_create_vector_table_time));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "getTableSchema", "()Ljava/lang/String;",

                                                &_jni_scanner_get_table_schema));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "close", "()V", &_jni_scanner_close));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "releaseColumn", "(I)V",

                                                &_jni_scanner_release_column));

    RETURN_IF_ERROR(

            _jni_scanner_cls.get_method(env, "releaseTable", "()V", &_jni_scanner_release_table));

    RETURN_IF_ERROR(_jni_scanner_cls.get_method(env, "getStatistics", "()Ljava/util/Map;",

                                                &_jni_scanner_get_statistics));

    RETURN_IF_ERROR(

            _jni_scanner_cls.get_method(env, "setBatchSize", "(I)V", &_jni_scanner_set_batch_size));

    return Status::OK();

}

// =========================================================================

// JniReader::_fill_block  (merged from JniConnector::_fill_block)

// =========================================================================

Status JniReader::_fill_block(Block* block, size_t num_rows) {

    SCOPED_RAW_TIMER(&_fill_block_watcher);

    JNIEnv* env = nullptr;

    RETURN_IF_ERROR(Jni::Env::Get(&env));

    // Fallback: if _col_name_to_block_idx was not set by the caller (e.g. JdbcScanner),

    // build the name-to-position map from the block itself.

    std::unordered_map<std::string, uint32_t> local_name_to_idx;

    const std::unordered_map<std::string, uint32_t>* col_map = _col_name_to_block_idx;

    if (col_map == nullptr) {

        local_name_to_idx = block->get_name_to_pos_map();

        col_map = &local_name_to_idx;

    }

    for (int i = 0; i < _column_names.size(); ++i) {

        auto& column_with_type_and_name = block->get_by_position(col_map->at(_column_names[i]));

        auto& column_ptr = column_with_type_and_name.column;

        auto& column_type = column_with_type_and_name.type;

        RETURN_IF_ERROR(JniDataBridge::fill_column(_table_meta, column_ptr, column_type, num_rows));

        // Column is not released when fill_column failed. It will be released when releasing table.

        RETURN_IF_ERROR(_jni_scanner_obj.call_void_method(env, _jni_scanner_release_column)

                                .with_arg(i)

                                .call());

        RETURN_ERROR_IF_EXC(env);

    }

    return Status::OK();

}

// =========================================================================

// JniReader::_get_statistics  (merged from JniConnector::get_statistics)

// =========================================================================

Status JniReader::_get_statistics(JNIEnv* env, std::map<std::string, std::string>* result) {

    result->clear();

    Jni::LocalObject metrics;

    RETURN_IF_ERROR(

            _jni_scanner_obj.call_object_method(env, _jni_scanner_get_statistics).call(&metrics));

    RETURN_IF_ERROR(Jni::Util::convert_to_cpp_map(env, metrics, result));

    return Status::OK();

}

// =========================================================================

// JniReader::_collect_profile_before_close

// (merged from JniConnector::_collect_profile_before_close)

// =========================================================================

void JniReader::_collect_profile_before_close() {

    if (_scanner_opened && _profile != nullptr) {

        JNIEnv* env = nullptr;

        Status st = Jni::Env::Get(&env);

        if (!st) {

            LOG(WARNING) << "failed to get jni env when collect profile: " << st;

            return;

        }

        // update scanner metrics

        std::map<std::string, std::string> statistics_result;

        st = _get_statistics(env, &statistics_result);

        if (!st) {

            LOG(WARNING) << "failed to get_statistics when collect profile: " << st;

            return;

        }

        for (const auto& metric : statistics_result) {

            std::vector<std::string> type_and_name = split(metric.first, ":");

            if (type_and_name.size() != 2) {

                LOG(WARNING) << "Name of JNI Scanner metric should be pattern like "

                             << "'metricType:metricName'";

                continue;

            }

            long metric_value = std::stol(metric.second);

            RuntimeProfile::Counter* scanner_counter;

            if (type_and_name[0] == "timer") {

                scanner_counter =

                        ADD_CHILD_TIMER(_profile, type_and_name[1], _connector_name.c_str());

            } else if (type_and_name[0] == "counter") {

                scanner_counter = ADD_CHILD_COUNTER(_profile, type_and_name[1], TUnit::UNIT,

                                                    _connector_name.c_str());

            } else if (type_and_name[0] == "bytes") {

                scanner_counter = ADD_CHILD_COUNTER(_profile, type_and_name[1], TUnit::BYTES,

                                                    _connector_name.c_str());

            } else {

                LOG(WARNING) << "Type of JNI Scanner metric should be timer, counter or bytes";

                continue;

            }

            COUNTER_UPDATE(scanner_counter, metric_value);

        }

    }

}

// =========================================================================

// MockJniReader

// =========================================================================

MockJniReader::MockJniReader(const std::vector<SlotDescriptor*>& file_slot_descs,

                             RuntimeState* state, RuntimeProfile* profile)

        : JniReader(

                  file_slot_descs, state, profile, "org/apache/doris/common/jni/MockJniScanner",

                  [&]() {

                      std::ostringstream required_fields;

                      std::ostringstream columns_types;

                      int index = 0;

                      for (const auto& desc : file_slot_descs) {

                          std::string field = desc->col_name();

                          std::string type =

                                  JniDataBridge::get_jni_type_with_different_string(desc->type());

                          if (index == 0) {

                              required_fields << field;

                              columns_types << type;

                          } else {

                              required_fields << "," << field;

                              columns_types << "#" << type;

                          }

                          index++;

                      }

                      return std::map<String, String> {{"mock_rows", "10240"},

                                                       {"required_fields", required_fields.str()},

                                                       {"columns_types", columns_types.str()}};

                  }(),

                  [&]() {

                      std::vector<std::string> names;

                      for (const auto& desc : file_slot_descs) {

                          names.emplace_back(desc->col_name());

                      }

                      return names;

                  }()) {}

Status MockJniReader::init_reader() {

    return open(_state, _profile);

}

} // namespace doris