/****************************************************************************
**
** 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_FetchAll_Generic
         {

            static QSqlError fetchAll(const qx::QxSqlQuery &query, T &t, QSqlDatabase *pDatabase, const QStringList &columns)
            {
               qx::dao::detail::QxDao_Helper<T> dao(t, pDatabase, "fetch all", new qx::QxSqlQueryBuilder_FetchAll<T>(), (&query));
               if (!dao.isValid())
               {
                  return dao.error();
               }

#ifdef _QX_ENABLE_MONGODB
               if (dao.isMongoDB())
               {
                  dao.setSqlColumns(columns);
                  qx::dao::on_before_fetch<T>((&t), (&dao));
                  if (!dao.isValid())
                  {
                     return dao.error();
                  }
                  QString json = qx::serialization::json::to_string(t, 1, "mongodb:only_id");
                  qx::dao::mongodb::QxMongoDB_Helper::findOne((&dao), dao.getDataMemberX()->getClass(), json, (&query));
                  if (!dao.isValid())
                  {
                     return dao.error();
                  }

                  qx::dao::detail::IxDao_Timer timer((&dao), qx::dao::detail::IxDao_Helper::timer_cpp_build_instance);
                  QString ctx = QString("mongodb") + ((columns.count() > 0) ? (QString(":columns{,") + columns.join(",") + QString(",}")) : QString());
                  qx::serialization::json::from_string(t, json, 1, ctx);
                  qx::dao::on_after_fetch<T>((&t), (&dao));
                  if (!dao.isValid())
                  {
                     return dao.error();
                  }
                  return dao.error();
               }
#endif // _QX_ENABLE_MONGODB

               QString sql = dao.builder().buildSql(columns).getSqlQuery();
               if (sql.isEmpty())
               {
                  return dao.errEmpty();
               }
               if (!query.isEmpty())
               {
                  dao.addQuery(true);
                  sql = dao.builder().getSqlQuery();
               }
               if (!dao.exec())
               {
                  return dao.errFailed();
               }

               if (dao.nextRecord())
               {
                  qx::dao::detail::IxDao_Timer timer((&dao), qx::dao::detail::IxDao_Helper::timer_cpp_build_instance);
                  qx::dao::on_before_fetch<T>((&t), (&dao));
                  if (!dao.isValid())
                  {
                     return dao.error();
                  }
                  qx::dao::detail::QxSqlQueryHelper_FetchAll<T>::resolveOutput(t, dao.query(), dao.builder(), columns);
                  qx::dao::on_after_fetch<T>((&t), (&dao));
                  if (!dao.isValid())
                  {
                     return dao.error();
                  }
               }

               return dao.error();
            }
         };

#ifdef _QX_ENABLE_MONGODB
         template <class T>
         struct QxDao_FetchAll_MongoDB_Fetcher : public qx::dao::mongodb::QxMongoDB_Fetcher
         {

            T &m_t;
            qx::dao::detail::QxDao_Helper_Container<T> &m_dao;

            QxDao_FetchAll_MongoDB_Fetcher(T &t, qx::dao::detail::QxDao_Helper_Container<T> &dao) : qx::dao::mongodb::QxMongoDB_Fetcher(), m_t(t), m_dao(dao) { ; }
            virtual ~QxDao_FetchAll_MongoDB_Fetcher() { ; }

            virtual void fetch(const QString &json)
            {
               typedef typename qx::trait::generic_container<T>::type_item type_item;
               typedef typename type_item::type_value_qx type_value_qx;
               type_item item = qx::trait::generic_container<T>::createItem();
               type_value_qx &item_val = item.value_qx();
               qx::IxDataMember *pId = m_dao.getDataId();
               QStringList columns = m_dao.getSqlColumns();

               if (json.isEmpty())
               {
                  return;
               }
               qx::dao::detail::IxDao_Timer timer((&m_dao), qx::dao::detail::IxDao_Helper::timer_cpp_build_instance);
               qx::dao::on_before_fetch<type_value_qx>((&item_val), (&m_dao));
               if (!m_dao.isValid())
               {
                  return;
               }
               QString ctx = QString("mongodb") + ((columns.count() > 0) ? (QString(":columns{,") + columns.join(",") + QString(",}")) : QString());
               qx::serialization::json::from_string(item_val, json, 1, ctx);
               for (int i = 0; i < (pId ? pId->getNameCount() : 0); i++)
               {
                  QVariant id = pId->toVariant((&item_val), "", i, qx::cvt::context::e_database);
                  qx::cvt::from_variant(id, item.key(), "", i, qx::cvt::context::e_database);
               }
               qx::dao::on_after_fetch<type_value_qx>((&item_val), (&m_dao));
               if (!m_dao.isValid())
               {
                  return;
               }
               qx::dao::detail::QxDao_Keep_Original<type_item>::backup(item);
               qx::trait::generic_container<T>::insertItem(m_t, item);
            }
         };
#endif // _QX_ENABLE_MONGODB

         template <class T>
         struct QxDao_FetchAll_Container
         {

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

               qx::trait::generic_container<T>::clear(t);
               qx::dao::detail::QxDao_Helper_Container<T> dao(t, pDatabase, "fetch all", new qx::QxSqlQueryBuilder_FetchAll<type_item>(), (&query));
               if (!dao.isValid())
               {
                  return dao.error();
               }

#ifdef _QX_ENABLE_MONGODB
               if (dao.isMongoDB())
               {
                  dao.setSqlColumns(columns);
                  QStringList &itemsAsJson = dao.itemsAsJson();
                  QxDao_FetchAll_MongoDB_Fetcher<T> fetcher(t, dao);
                  qx::dao::mongodb::QxMongoDB_Helper::findMany((&dao), dao.getDataMemberX()->getClass(), itemsAsJson, (&query), (&fetcher));
                  return dao.error();
               }
#endif // _QX_ENABLE_MONGODB

               QString sql = dao.builder().buildSql(columns).getSqlQuery();
               if (sql.isEmpty())
               {
                  return dao.errEmpty();
               }
               if (!query.isEmpty())
               {
                  dao.addQuery(true);
                  sql = dao.builder().getSqlQuery();
               }
               if (!dao.exec())
               {
                  return dao.errFailed();
               }
               dao.setSqlColumns(columns);

               bool bSize = (dao.hasFeature(QSqlDriver::QuerySize) && (dao.query().size() > 0));
               if (bSize)
               {
                  qx::trait::generic_container<T>::reserve(t, dao.query().size());
               }
               while (dao.nextRecord())
               {
                  insertNewItem(t, dao);
                  if (!dao.isValid())
                  {
                     return dao.error();
                  }
               }
               if (bSize)
               {
                  qAssert(qx::trait::generic_container<T>::size(t) == static_cast<long>(dao.query().size()));
               }

               return dao.error();
            }

         private:
            static void insertNewItem(T &t, qx::dao::detail::QxDao_Helper_Container<T> &dao)
            {
               typedef typename qx::trait::generic_container<T>::type_item type_item;
               typedef typename type_item::type_value_qx type_value_qx;
               type_item item = qx::trait::generic_container<T>::createItem();
               type_value_qx &item_val = item.value_qx();
               qx::IxDataMember *pId = dao.getDataId();
               QStringList columns = dao.getSqlColumns();

               qx::dao::detail::IxDao_Timer timer((&dao), qx::dao::detail::IxDao_Helper::timer_cpp_build_instance);
               if (pId)
               {
                  for (int i = 0; i < pId->getNameCount(); i++)
                  {
                     QVariant v = dao.getIdFromQuery(i);
                     qx::cvt::from_variant(v, item.key(), "", i, qx::cvt::context::e_database);
                  }
               }
               qx::dao::on_before_fetch<type_value_qx>((&item_val), (&dao));
               if (!dao.isValid())
               {
                  return;
               }
               qx::dao::detail::QxSqlQueryHelper_FetchAll<type_value_qx>::resolveOutput(item_val, dao.query(), dao.builder(), columns);
               qx::dao::on_after_fetch<type_value_qx>((&item_val), (&dao));
               if (!dao.isValid())
               {
                  return;
               }
               qx::dao::detail::QxDao_Keep_Original<type_item>::backup(item);
               qx::trait::generic_container<T>::insertItem(t, item);
            }
         };

         template <class T>
         struct QxDao_FetchAll_Ptr
         {

            static inline QSqlError fetchAll(const qx::QxSqlQuery &query, T &t, QSqlDatabase *pDatabase, const QStringList &columns)
            {
               return (t ? qx::dao::fetch_by_query(query, (*t), pDatabase, columns) : QSqlError());
            }
         };

         template <class T>
         struct QxDao_FetchAll
         {

            static inline QSqlError fetchAll(const qx::QxSqlQuery &query, T &t, QSqlDatabase *pDatabase, const QStringList &columns)
            {
               typedef typename std::conditional<std::is_pointer<T>::value, qx::dao::detail::QxDao_FetchAll_Ptr<T>, qx::dao::detail::QxDao_FetchAll_Generic<T>>::type type_dao_1;
               typedef typename std::conditional<qx::trait::is_smart_ptr<T>::value, qx::dao::detail::QxDao_FetchAll_Ptr<T>, type_dao_1>::type type_dao_2;
               typedef typename std::conditional<qx::trait::is_container<T>::value, qx::dao::detail::QxDao_FetchAll_Container<T>, type_dao_2>::type type_dao_3;

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

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