/****************************************************************************
**
** 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
**
****************************************************************************/

namespace qx
{
   namespace dao
   {
      namespace detail
      {

         template <class T>
         struct QxDao_Save_WithRelation_Generic
         {

            static QSqlError save(const QStringList &relation, T &t, QSqlDatabase *pDatabase)
            {
               qx::dao::detail::QxDao_Helper<T> dao(t, pDatabase, "save with relation", new qx::QxSqlQueryBuilder_Update<T>());
               if (!dao.isValid())
               {
                  return dao.error();
               }
               if (!dao.updateSqlRelationX(relation))
               {
                  return dao.errInvalidRelation();
               }
               if (!pDatabase)
               {
                  dao.transaction();
               }
               dao.quiet();

               qx_bool bExist = dao.isValidPrimaryKey(t);
               if (bExist)
               {
                  bExist = qx::dao::exist(t, (&dao.database()));
               }
               if (bExist)
               {
                  dao.updateError(qx::dao::update_with_relation(relation, t, (&dao.database())));
               }
               else
               {
                  dao.updateError(qx::dao::insert_with_relation(relation, t, (&dao.database())));
               }

               return dao.error();
            }
         };

         template <class T>
         struct QxDao_Save_WithRelation_Container
         {

            static QSqlError save(const QStringList &relation, T &t, QSqlDatabase *pDatabase)
            {
               typedef typename qx::trait::generic_container<T>::type_value_qx type_item;

               if (qx::trait::generic_container<T>::size(t) <= 0)
               {
                  return QSqlError();
               }
               qx::dao::detail::QxDao_Helper_Container<T> dao(t, pDatabase, "save with relation", new qx::QxSqlQueryBuilder_Update<type_item>());
               if (!dao.isValid())
               {
                  return dao.error();
               }
               if (!dao.updateSqlRelationX(relation))
               {
                  return dao.errInvalidRelation();
               }
               if (!pDatabase)
               {
                  dao.transaction();
               }
               dao.quiet();

               for (typename T::iterator it = t.begin(); it != t.end(); ++it)
               {
                  if (!saveItem(relation, (*it), dao))
                  {
                     return dao.error();
                  }
               }

               return dao.error();
            }

         private:
            template <typename U>
            static inline bool saveItem(const QStringList &relation, U &item, qx::dao::detail::QxDao_Helper_Container<T> &dao)
            {
               bool bSaveOk = saveItem_Helper < U, std::is_pointer<U>::value || qx::trait::is_smart_ptr<U>::value > ::save(relation, item, dao);
               if (bSaveOk)
               {
                  qx::dao::detail::QxDao_Keep_Original<U>::backup(item);
               }
               return bSaveOk;
            }

            template <typename U, bool bIsPointer /* = true */>
            struct saveItem_Helper
            {
               static inline bool save(const QStringList &relation, U &item, qx::dao::detail::QxDao_Helper_Container<T> &dao)
               {
                  return (item ? qx::dao::detail::QxDao_Save_WithRelation_Container<T>::saveItem(relation, (*item), dao) : false);
               }
            };

            template <typename U1, typename U2>
            struct saveItem_Helper<std::pair<U1, U2>, false>
            {
               static inline bool save(const QStringList &relation, std::pair<U1, U2> &item, qx::dao::detail::QxDao_Helper_Container<T> &dao)
               {
                  return qx::dao::detail::QxDao_Save_WithRelation_Container<T>::saveItem(relation, item.second, dao);
               }
            };

            template <typename U1, typename U2>
            struct saveItem_Helper<const std::pair<U1, U2>, false>
            {
               static inline bool save(const QStringList &relation, const std::pair<U1, U2> &item, qx::dao::detail::QxDao_Helper_Container<T> &dao)
               {
                  return qx::dao::detail::QxDao_Save_WithRelation_Container<T>::saveItem(relation, item.second, dao);
               }
            };

#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
            template <typename U1, typename U2>
            struct saveItem_Helper<QPair<U1, U2>, false>
            {
               static inline bool save(const QStringList &relation, QPair<U1, U2> &item, qx::dao::detail::QxDao_Helper_Container<T> &dao)
               {
                  return qx::dao::detail::QxDao_Save_WithRelation_Container<T>::saveItem(relation, item.second, dao);
               }
            };

            template <typename U1, typename U2>
            struct saveItem_Helper<const QPair<U1, U2>, false>
            {
               static inline bool save(const QStringList &relation, const QPair<U1, U2> &item, qx::dao::detail::QxDao_Helper_Container<T> &dao)
               {
                  return qx::dao::detail::QxDao_Save_WithRelation_Container<T>::saveItem(relation, item.second, dao);
               }
            };
#endif // (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))

            template <typename U>
            struct saveItem_Helper<U, false>
            {
               static bool save(const QStringList &relation, U &item, qx::dao::detail::QxDao_Helper_Container<T> &dao)
               {
                  qx_bool bExist = dao.isValidPrimaryKey(item);
                  if (bExist)
                  {
                     bExist = qx::dao::exist(item, (&dao.database()));
                  }
                  if (bExist)
                  {
                     dao.updateError(qx::dao::update_with_relation(relation, item, (&dao.database())));
                  }
                  else
                  {
                     dao.updateError(qx::dao::insert_with_relation(relation, item, (&dao.database())));
                  }

                  return dao.isValid();
               }
            };
         };

         template <class T>
         struct QxDao_Save_WithRelation_Ptr
         {

            static inline QSqlError save(const QStringList &relation, T &t, QSqlDatabase *pDatabase)
            {
               return (t ? qx::dao::save_with_relation(relation, (*t), pDatabase) : QSqlError());
            }
         };

         template <class T>
         struct QxDao_Save_WithRelation
         {

            static inline QSqlError save(const QString &relation, T &t, QSqlDatabase *pDatabase)
            {
               QStringList lst;
               if (!relation.isEmpty())
               {
                  lst = relation.split("|");
               }
               return QxDao_Save_WithRelation<T>::save(lst, t, pDatabase);
            }

            static inline QSqlError save(const QStringList &relation, T &t, QSqlDatabase *pDatabase)
            {
               typedef typename std::conditional<std::is_pointer<T>::value, qx::dao::detail::QxDao_Save_WithRelation_Ptr<T>, qx::dao::detail::QxDao_Save_WithRelation_Generic<T>>::type type_dao_1;
               typedef typename std::conditional<qx::trait::is_smart_ptr<T>::value, qx::dao::detail::QxDao_Save_WithRelation_Ptr<T>, type_dao_1>::type type_dao_2;
               typedef typename std::conditional<qx::trait::is_container<T>::value, qx::dao::detail::QxDao_Save_WithRelation_Container<T>, type_dao_2>::type type_dao_3;

               QSqlError error = type_dao_3::save(relation, t, pDatabase);
               if (!error.isValid())
               {
                  qx::dao::detail::QxDao_Keep_Original<T>::backup(t);
               }
               return error;
            }
         };

      } // namespace detail
   } // namespace dao
} // namespace qx