// 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 <Core/Block.h>
#include <DataStreams/IRowOutputStream.h>


namespace DB
{

class WriteBuffer;

/** A stream for outputting data in tsv format.
  */
class TabSeparatedRowOutputStream : public IRowOutputStream
{
public:
    /** with_names - output in the first line a header with column names
      * with_types - output the next line header with the names of the types
      */
    TabSeparatedRowOutputStream(
        WriteBuffer & ostr_,
        const Block & sample_,
        bool with_names_ = false,
        bool with_types_ = false);

    void writeField(const IColumn & column, const IDataType & type, size_t row_num) override;
    void writeFieldDelimiter() override;
    void writeRowEndDelimiter() override;
    void writePrefix() override;
    void writeSuffix() override;

    void flush() override;

    void setExtremes(const Block & extremes_) override { extremes = extremes_; }

    /// https://www.iana.org/assignments/media-types/text/tab-separated-values
    String getContentType() const override { return "text/tab-separated-values; charset=UTF-8"; }

protected:
    void writeExtremes();

    WriteBuffer & ostr;
    const Block sample;
    bool with_names;
    bool with_types;
    Block extremes;
};

} // namespace DB