/*
* This file is part of the Pandaria 5.4.8 Project. See THANKS 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 _TRANSACTION_H
#define _TRANSACTION_H

#include "SQLOperation.h"
#include "Task.h"
#include <memory>
#include <mutex>

//- Forward declare (don't include header to prevent circular includes)
class PreparedStatement;

/*! Transactions, high level class. */
class Transaction
{
    friend class TransactionTask;
    friend class MySQLConnection;

    template <typename T>
    friend class DatabaseWorkerPool;

    public:
        Transaction() : _cleanedUp(false) { }
        ~Transaction() { Cleanup(); }

        void Append(PreparedStatement* statement);
        void Append(const char* sql);
        void PAppend(const char* sql, ...);

        size_t GetSize() const { return m_queries.size(); }

    protected:
        void Cleanup();
        std::list<SQLElementData> m_queries;

    private:
        bool _cleanedUp;

};
typedef std::shared_ptr<Transaction> SQLTransaction;

/*! Low level class*/
class TransactionTask : public SQLOperation
{
    template <class T> friend class DatabaseWorkerPool;
    friend class DatabaseWorker;

    public:
        TransactionTask(SQLTransaction&& trans, Task<bool>* continuation = nullptr)
            : m_trans(std::move(trans)), _continuation(continuation) { }

        ~TransactionTask(){};

    protected:
        bool Execute();
        bool DoTask();

        SQLTransaction m_trans;
        static std::mutex _lock;
        Task<bool>* _continuation;
};

class SafeTransactionTask : public TransactionTask
{
public:
    SafeTransactionTask(SQLTransaction&& trans, Task<bool>* continuation = nullptr)
        : TransactionTask(std::move(trans), continuation) { }

protected:
    bool Execute();
};

#endif
