/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _PREPAREDSTATEMENT_H
#define _PREPAREDSTATEMENT_H

#include "Define.h"
#include "SQLOperation.h"
#include <future>
#include <vector>
#include <variant>

#ifdef __APPLE__
#undef TYPE_BOOL
#endif

//- This enum helps us differ data held in above union
enum PreparedStatementValueType
{
    TYPE_BOOL,
    TYPE_UI8,
    TYPE_UI16,
    TYPE_UI32,
    TYPE_UI64,
    TYPE_I8,
    TYPE_I16,
    TYPE_I32,
    TYPE_I64,
    TYPE_FLOAT,
    TYPE_DOUBLE,
    TYPE_STRING,
    TYPE_BINARY,
    TYPE_NULL
};

struct PreparedStatementData
{
    std::variant<
    bool,               // TYPE_BOOL
    uint8,              // TYPE_UI8
    uint16,             // TYPE_UI16
    uint32,             // TYPE_UI32
    uint64,             // TYPE_UI64
    int8,               // TYPE_I8
    int16,              // TYPE_I16
    int32,              // TYPE_UI32
    int64,              // TYPE_UI64
    float,              // TYPE_FLOAT
    double,             // TYPE_DOUBLE
    std::string,        // TYPE_STRING
    std::vector<uint8>> // TYPE_BINARY
    data;
    PreparedStatementValueType type;
};

//- Upper-level class that is used in code
class TC_DATABASE_API PreparedStatement
{
    friend class PreparedStatementTask;

    public:
        PreparedStatement(uint32 index, uint8 capacity);
        ~PreparedStatement();

        void setNull(const uint8 index);
        void setBool(const uint8 index, const bool value);
        void setUInt8(const uint8 index, const uint8 value);
        void setUInt16(const uint8 index, const uint16 value);
        void setUInt32(const uint8 index, const uint32 value);
        void setUInt64(const uint8 index, const uint64 value);
        void setInt8(const uint8 index, const int8 value);
        void setInt16(const uint8 index, const int16 value);
        void setInt32(const uint8 index, const int32 value);
        void setInt64(const uint8 index, const int64 value);
        void setFloat(const uint8 index, const float value);
        void setDouble(const uint8 index, const double value);
        void setString(const uint8 index, const std::string& value);
        void setBinary(const uint8 index, const std::vector<uint8>& value);

        uint32 GetIndex() const { return m_index; }
        std::vector<PreparedStatementData> const& GetParameters() const { return statement_data; }

    protected:
        uint32 m_index;

        //- Buffer of parameters, not tied to MySQL in any way yet
        std::vector<PreparedStatementData> statement_data;

        PreparedStatement(PreparedStatement const& right) = delete;
        PreparedStatement& operator=(PreparedStatement const& right) = delete;
};

//- Lower-level class, enqueuable operation
class TC_DATABASE_API PreparedStatementTask : public SQLOperation
{
    public:
        PreparedStatementTask(PreparedStatement* stmt, bool async = false);
        ~PreparedStatementTask();

        bool Execute() override;
        PreparedQueryResultFuture GetFuture() { return m_result->get_future(); }

    protected:
        PreparedStatement* m_stmt;
        bool m_has_result;
        PreparedQueryResultPromise* m_result;
};
#endif