// 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.

#pragma once

#include <cstddef>

#include <memory>

#include <string>

#include <unordered_map>

#include <unordered_set>

#include <vector>

#include "common/status.h"

#include "exec/connector/jni_connector.h"

#include "format/generic_reader.h"

#include "storage/olap_scan_common.h"

namespace doris {

#include "common/compile_check_begin.h"

class RuntimeProfile;

class RuntimeState;

class SlotDescriptor;

class Block;

} // namespace doris

namespace doris {

class JniReader : public GenericReader {

public:

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

              RuntimeProfile* profile)

            : _file_slot_descs(file_slot_descs), _state(state), _profile(profile) {};

    ~JniReader() override = default;

    Status get_columns(std::unordered_map<std::string, DataTypePtr>* name_to_type,

                       std::unordered_set<std::string>* missing_cols) override {

        for (const auto& desc : _file_slot_descs) {

            name_to_type->emplace(desc->col_name(), desc->type());

        }

        return Status::OK();

    }

    Status get_next_block(Block* block, size_t* read_rows, bool* eof) override {

        return _jni_connector->get_next_block(block, read_rows, eof);

    }

    Status close() override {

        if (_jni_connector) {

            return _jni_connector->close();

        }

        return Status::OK();

    }

    void set_col_name_to_block_idx(

            const std::unordered_map<std::string, uint32_t>* col_name_to_block_idx) {

        if (_jni_connector) {

            _jni_connector->set_col_name_to_block_idx(col_name_to_block_idx);

        }

    }

protected:

    void _collect_profile_before_close() override {

        if (_jni_connector) {

            _jni_connector->collect_profile_before_close();

        }

    }

    const std::vector<SlotDescriptor*>& _file_slot_descs;

    RuntimeState* _state = nullptr;

    RuntimeProfile* _profile = nullptr;

    std::unique_ptr<JniConnector> _jni_connector;

};

/**

 * The demo usage of JniReader, showing how to read data from java scanner.

 * The java side is also a mock reader that provide values for each type.

 * This class will only be retained during the functional testing phase to verify that

 * the communication and data exchange with the jvm are correct.

 */

class MockJniReader : public JniReader {

public:

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

                  RuntimeProfile* profile);

    ~MockJniReader() override = default;

    Status init_reader();

    Status close() override {

        if (_jni_connector) {

            return _jni_connector->close();

        }

        return Status::OK();

    }

protected:

    void _collect_profile_before_close() override {

        if (_jni_connector != nullptr) {

            _jni_connector->collect_profile_before_close();

        }

    }

};

#include "common/compile_check_end.h"

} // namespace doris