/****************************************************************************
**
** https://www.qxorm.com/
** Copyright (C) 2013 XDL Team (ic-east.com)
**
** This file is part of the QxOrm library
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any
** damages arising from the use of this software
**
** Commercial Usage
** Licensees holding valid commercial QxOrm licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and XDL Team
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file 'license.gpl3.txt' included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met : http://www.gnu.org/copyleft/gpl.html
**
** If you are unsure which license is appropriate for your use, or
** if you have questions regarding the use of this file, please contact :
** ic-east.com
**
****************************************************************************/

#ifndef _QX_FUNCTION_0_H_
#define _QX_FUNCTION_0_H_

#ifdef _MSC_VER
#pragma once
#endif

/*!
 * \file QxFunction_0.h
 * \author XDL Team
 * \ingroup QxFunction
 * \brief Concrete function class registered into QxOrm context without parameter
 */

#include <QxFunction/IxFunction.h>
#include <QxFunction/QxParameters.h>

namespace qx
{

   /*!
    * \ingroup QxFunction
    * \brief qx::QxFunction_0<Owner, R> : concrete function registered into QxOrm context defined into class Owner, returning an object of type R and without parameter
    */
   template <class Owner, typename R>
   class QxFunction_0 : public IxFunction
   {

   public:
      typedef std::function<R(Owner *)> type_fct;
      QX_FUNCTION_CLASS_MEMBER_FCT(QxFunction_0);

      virtual int getParamCount() const { return 0; }
      virtual qx_bool isValidParams(const QString &params) const
      {
         Q_UNUSED(params);
         return true;
      }
      virtual qx_bool isValidParams(const type_any_params &params) const
      {
         Q_UNUSED(params);
         return true;
      }

   private:
      template <class T, bool bReturnValue /* = false */>
      struct QxInvokerFct
      {
         static inline qx_bool invoke(void *pOwner, const T &params, qx::any *ret, const QxFunction_0 *pThis)
         {
            QX_FUNCTION_INVOKE_START_WITH_OWNER();
            try
            {
               pThis->m_fct(static_cast<Owner *>(pOwner));
            }
            QX_FUNCTION_CATCH_AND_RETURN_INVOKE();
         }
      };

      template <class T>
      struct QxInvokerFct<T, true>
      {
         static inline qx_bool invoke(void *pOwner, const T &params, qx::any *ret, const QxFunction_0 *pThis)
         {
            QX_FUNCTION_INVOKE_START_WITH_OWNER();
            try
            {
               R retTmp = pThis->m_fct(static_cast<Owner *>(pOwner));
               if (ret)
               {
                  (*ret) = qx::any(retTmp);
               }
            }
            QX_FUNCTION_CATCH_AND_RETURN_INVOKE();
         }
      };
   };

   template <typename R>
   class QxFunction_0<void, R> : public IxFunction
   {

   public:
      typedef std::function<R()> type_fct;
      QX_FUNCTION_CLASS_FCT(QxFunction_0);

      virtual int getParamCount() const { return 0; }
      virtual qx_bool isValidParams(const QString &params) const
      {
         Q_UNUSED(params);
         return true;
      }
      virtual qx_bool isValidParams(const type_any_params &params) const
      {
         Q_UNUSED(params);
         return true;
      }

   private:
      template <class T, bool bReturnValue /* = false */>
      struct QxInvokerFct
      {
         static inline qx_bool invoke(const T &params, qx::any *ret, const QxFunction_0 *pThis)
         {
            QX_FUNCTION_INVOKE_START_WITHOUT_OWNER();
            try
            {
               pThis->m_fct();
            }
            QX_FUNCTION_CATCH_AND_RETURN_INVOKE();
         }
      };

      template <class T>
      struct QxInvokerFct<T, true>
      {
         static inline qx_bool invoke(const T &params, qx::any *ret, const QxFunction_0 *pThis)
         {
            QX_FUNCTION_INVOKE_START_WITHOUT_OWNER();
            try
            {
               R retTmp = pThis->m_fct();
               if (ret)
               {
                  (*ret) = qx::any(retTmp);
               }
            }
            QX_FUNCTION_CATCH_AND_RETURN_INVOKE();
         }
      };
   };

   namespace function
   {

      template <class Owner, typename R>
      IxFunction_ptr bind_fct_0(const typename QxFunction_0<Owner, R>::type_fct &fct)
      {
         typedef std::is_same<Owner, void> qx_verify_owner_tmp;
         static_assert(qx_verify_owner_tmp::value, "qx_verify_owner_tmp::value");
         IxFunction_ptr ptr = std::make_shared<QxFunction_0<void, R>>(fct);
         return ptr;
      }

      template <class Owner, typename R>
      IxFunction_ptr bind_member_fct_0(const typename QxFunction_0<Owner, R>::type_fct &fct)
      {
         typedef std::is_same<Owner, void> qx_verify_owner_tmp;
         static_assert(!qx_verify_owner_tmp::value, "! qx_verify_owner_tmp::value");
         IxFunction_ptr ptr = std::make_shared<QxFunction_0<Owner, R>>(fct);
         return ptr;
      }

   } // namespace function
} // namespace qx

#endif // _QX_FUNCTION_0_H_
