/****************************************************************************
**
** 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
**
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** 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 :
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****************************************************************************/

#ifndef _QX_SQL_RELATION_H_
#define _QX_SQL_RELATION_H_

#ifdef _MSC_VER
#pragma once
#endif

/*!
 * \file QxSqlRelation.h
 * \author XDL Team
 * \ingroup QxDao
 * \brief Base class for all relationships defined between 2 classes (or between 2 tables in database)
 */

#include <QxDao/QxDao.h>
#include <QxDao/IxSqlRelation.h>
#include <QxDao/IxSqlQueryBuilder.h>

#include <QxTraits/remove_attr.h>
#include <QxTraits/remove_smart_ptr.h>
#include <QxTraits/generic_container.h>
#include <QxTraits/is_container.h>
#include <QxTraits/is_valid_primary_key.h>
#include <QxTraits/is_qx_registered.h>

#include <QxRegister/IxClass.h>

namespace qx
{

   template <class T>
   class QxClass;

   /*!
    * \ingroup QxDao
    * \brief qx::QxSqlRelation<DataType, Owner> : base class for all relationships defined between 2 classes (or between 2 tables in database)
    */
   template <class DataType, class Owner>
   class QxSqlRelation : public IxSqlRelation
   {

   protected:
      typedef typename qx::trait::remove_attr<DataType>::type type_tmp_1;
      typedef typename qx::trait::remove_smart_ptr<type_tmp_1>::type type_tmp_2;
      typedef type_tmp_2 type_container;
      typedef qx::trait::generic_container<type_container> type_generic_container;
      typedef typename type_generic_container::type_item type_item;
      typedef typename std::conditional<qx::trait::is_container<type_container>::value, typename type_generic_container::type_value_qx, type_container>::type type_tmp_3;
      typedef typename QxSqlRelation<DataType, Owner>::type_tmp_3 type_data;
      typedef Owner type_owner;

      enum
      {
         is_valid = (qx::trait::is_qx_registered<type_data>::value && qx::trait::is_qx_registered<type_owner>::value)
      };
      enum
      {
         is_data_pointer = (std::is_pointer<DataType>::value || qx::trait::is_smart_ptr<DataType>::value)
      };
      enum
      {
         is_data_container = qx::trait::is_container<type_container>::value
      };
      enum
      {
         is_same_data_owner = std::is_same<type_data, type_owner>::value
      };

   public:
      QxSqlRelation(IxDataMember *p) : IxSqlRelation(p) { this->setIsSameDataOwner(static_cast<int>(is_same_data_owner)); }
      virtual ~QxSqlRelation() { static_assert(is_valid, "is_valid"); }

      virtual void init()
      {
         if (!this->canInit())
         {
            return;
         }
         this->setClass(QxClass<type_data>::getSingleton(), QxClass<type_owner>::getSingleton());
         IxSqlRelation::init();
      }

   protected:
      DataType *getDataTypePtr(QxSqlRelationParams &params) const
      {
         qAssert(params.owner() && this->getDataMember());
         return static_cast<DataType *>(this->getDataMember()->getValueVoidPtr(params.owner()));
      }

      type_owner &getOwner(QxSqlRelationParams &params) const
      {
         qAssert(params.owner());
         return (*static_cast<type_owner *>(params.owner()));
      }

      type_data &getData(QxSqlRelationParams &params) const
      {
         return getData_Helper<is_data_pointer, is_data_container, 0>::get(getDataTypePtr(params));
      }

      type_container &getContainer(QxSqlRelationParams &params) const
      {
         return getContainer_Helper<is_data_pointer, is_data_container, 0>::get(getDataTypePtr(params));
      }

      type_item createItem() const
      {
         return createItem_Helper<is_data_container, 0>::get();
      }

      bool isNullData(QxSqlRelationParams &params) const
      {
         return isNullData_Helper<is_data_pointer, 0>::get(getDataTypePtr(params));
      }

      bool callTriggerBeforeFetch(type_data &t, QxSqlRelationParams &params) const
      {
         if (!params.builder().getDaoHelper())
         {
            return true;
         }
         qx::dao::on_before_fetch<type_data>((&t), params.builder().getDaoHelper());
         return params.builder().getDaoHelper()->isValid();
      }

      bool callTriggerAfterFetch(type_data &t, QxSqlRelationParams &params) const
      {
         if (!params.builder().getDaoHelper())
         {
            return true;
         }
         qx::dao::on_after_fetch<type_data>((&t), params.builder().getDaoHelper());
         return params.builder().getDaoHelper()->isValid();
      }

   private:
      template <bool bIsPointer /* = false */, bool bIsContainer /* = false */, int dummy>
      struct getData_Helper
      {
         static type_data &get(DataType *t) { return (*t); }
      };

      template <int dummy>
      struct getData_Helper<true, false, dummy>
      {
         static type_data &get(DataType *t)
         {
            if (!(*t))
            {
               qx::trait::construct_ptr<DataType>::get(*t);
            };
            return (**t);
         }
      };

      template <int dummy>
      struct getData_Helper<false, true, dummy>
      {
         static type_data &get(DataType *t)
         {
            qAssert(false);
            Q_UNUSED(t);
            type_data *pDummy(NULL);
            return (*pDummy);
         }
      };

      template <int dummy>
      struct getData_Helper<true, true, dummy>
      {
         static type_data &get(DataType *t)
         {
            qAssert(false);
            Q_UNUSED(t);
            type_data *pDummy(NULL);
            return (*pDummy);
         }
      };

      template <bool bIsPointer /* = false */, bool bIsContainer /* = false */, int dummy>
      struct getContainer_Helper
      {
         static type_container &get(DataType *t)
         {
            qAssert(false);
            Q_UNUSED(t);
            type_container *pDummy(NULL);
            return (*pDummy);
         }
      };

      template <int dummy>
      struct getContainer_Helper<true, false, dummy>
      {
         static type_container &get(DataType *t)
         {
            qAssert(false);
            Q_UNUSED(t);
            type_container *pDummy(NULL);
            return (*pDummy);
         }
      };

      template <int dummy>
      struct getContainer_Helper<false, true, dummy>
      {
         static type_container &get(DataType *t) { return (*t); }
      };

      template <int dummy>
      struct getContainer_Helper<true, true, dummy>
      {
         static type_container &get(DataType *t)
         {
            if (!(*t))
            {
               qx::trait::construct_ptr<DataType>::get(*t);
            };
            return (**t);
         }
      };

      template <bool bIsContainer /* = false */, int dummy>
      struct createItem_Helper
      {
         static type_item get()
         {
            qAssert(false);
            type_item *pDummy(NULL);
            return (*pDummy);
         }
      };

      template <int dummy>
      struct createItem_Helper<true, dummy>
      {
         static type_item get() { return type_generic_container::createItem(); }
      };

      template <bool bIsPointer /* = false */, int dummy>
      struct isNullData_Helper
      {
         static bool get(DataType *t)
         {
            Q_UNUSED(t);
            return false;
         }
      };

      template <int dummy>
      struct isNullData_Helper<true, dummy>
      {
         static bool get(DataType *t) { return ((!(*t)) ? true : false); }
      };
   };

} // namespace qx

#include <QxDao/QxSqlRelation_OneToOne.h>
#include <QxDao/QxSqlRelation_OneToMany.h>
#include <QxDao/QxSqlRelation_ManyToOne.h>
#include <QxDao/QxSqlRelation_ManyToMany.h>
#include <QxDao/QxSqlRelation_RawData.h>

#endif // _QX_SQL_RELATION_H_
