// Copyright 2023 PingCAP, 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.

#pragma once

#include <Dictionaries/DictionaryStructure.h>
#include <Dictionaries/IDictionarySource.h>


namespace Poco
{
class Logger;
}


namespace DB
{

/// Allows loading dictionaries from executable
class ExecutableDictionarySource final : public IDictionarySource
{
public:
    ExecutableDictionarySource(
        const DictionaryStructure & dict_struct_,
        const Poco::Util::AbstractConfiguration & config,
        const std::string & config_prefix,
        Block & sample_block,
        const Context & context);

    ExecutableDictionarySource(const ExecutableDictionarySource & other);

    BlockInputStreamPtr loadAll() override;

    BlockInputStreamPtr loadUpdatedAll() override;

    BlockInputStreamPtr loadIds(const std::vector<UInt64> & ids) override;

    BlockInputStreamPtr loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;

    bool isModified() const override;

    bool supportsSelectiveLoad() const override;

    bool hasUpdateField() const override;

    DictionarySourcePtr clone() const override;

    std::string toString() const override;


private:
    std::string getUpdateFieldAndDate();

    Poco::Logger * log;

    std::chrono::time_point<std::chrono::system_clock> update_time;
    const DictionaryStructure dict_struct;
    const std::string command;
    const std::string update_field;
    const std::string format;
    Block sample_block;
    const Context & context;
};

} // namespace DB