// 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 <Parsers/IAST.h>


namespace DB
{

/** Query with output options (supporting [INTO OUTFILE 'file_name'] [FORMAT format_name] suffix).
  */
class ASTQueryWithOutput : public IAST
{
public:
    ASTPtr out_file;
    ASTPtr format;

    void formatImpl(const FormatSettings & s, FormatState & state, FormatStateStacked frame) const final;

    /// Remove 'FORMAT <fmt> and INTO OUTFILE <file>' if exists
    static bool resetOutputASTIfExist(IAST & ast);

protected:
    /// NOTE: call this helper at the end of the clone() method of descendant class.
    void cloneOutputOptions(ASTQueryWithOutput & cloned) const;

    /// Format only the query part of the AST (without output options).
    virtual void formatQueryImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame)
        const = 0;
};


/** Helper template for simple queries like SHOW PROCESSLIST.
  */
template <typename ASTIDAndQueryNames>
class ASTQueryWithOutputImpl : public ASTQueryWithOutput
{
public:
    String getID() const override { return ASTIDAndQueryNames::ID; };

    ASTPtr clone() const override
    {
        auto res = std::make_shared<ASTQueryWithOutputImpl<ASTIDAndQueryNames>>(*this);
        res->children.clear();
        cloneOutputOptions(*res);
        return res;
    }

protected:
    void formatQueryImpl(const FormatSettings & settings, FormatState &, FormatStateStacked) const override
    {
        settings.ostr << (settings.hilite ? hilite_keyword : "") << ASTIDAndQueryNames::Query
                      << (settings.hilite ? hilite_none : "");
    }
};

} // namespace DB