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/*
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* Copyright (C) 2015 Christian Ehringfeld <c.ehringfeld@t-online.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* 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 Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
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#ifndef ENTITYMANAGER_H
#define ENTITYMANAGER_H
#include <QtSql/QSqlDatabase>
#include <QtSql/QSqlRecord>
#include <QtSql/QSqlField>
#include <QString>
#include <QStringList>
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#include <QSharedPointer>
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#include <QDebug>
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#include "schema.h"
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#include <QtSql/QSqlError>
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#include <QMetaType>
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#include "entity.h"
#include "database.h"
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#include "entityinstancefactory.h"
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#include "cache.h"
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namespace CuteEntityManager {
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class EntityManager {
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signals:
void actionFinished(qint64 id);

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private:
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static QStringList connectionNames;
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QSharedPointer<Schema> schema;
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static void setConnectionNames(QStringList list);
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QSharedPointer<Database> db;
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Cache cache;
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QString createConnection();
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QString createTableQuery(const QSharedPointer<Entity> &entity);
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QList<QHash<QString, QVariant> > convertQueryResult(QSqlQuery &q);
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bool checkTable(const QSharedPointer<Entity> &entity);
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protected:
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void init();
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QList<QHash<QString, QVariant> > findAll(QString tblname);
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void resolveRelations(const QSharedPointer<Entity> &entity, const QHash<QString, QVariant> &map);
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QHash<QString, QVariant> findByPk(qint64 id, QString tblname);
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QSharedPointer<Entity> convert(const QHash<QString, QVariant> &map, const char *classname);
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QList<QSharedPointer<Entity>> convert(QList<QHash<QString, QVariant> > maps, const char *classname);
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void manyToOne(const QSharedPointer<Entity> &entity, const QVariant &id, const QMetaProperty &property);
void oneToMany(const QSharedPointer<Entity> &entity, const Relation &r, const QMetaProperty &property);
void manyToMany(const QSharedPointer<Entity> &entity, const Relation &r, const QMetaProperty &property);
void oneToOne(const QSharedPointer<Entity> &entity, const Relation &r, const QMetaProperty &property,
const QVariant &id = "");
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QList<QHash<QString, QVariant> > findAllByAttributes(const QSharedPointer<Entity> &entity, bool ignoreID = false);
QList<QHash<QString, QVariant> > findAllByAttributes(const QHash<QString, QVariant> &m, const QString &tblname,
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bool ignoreID = false);
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QSharedPointer<Entity> findById(const qint64 &id, Entity *&e);
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void setListProperty(const QSharedPointer<Entity> &entity, QList<QSharedPointer<Entity>> &list,
const QMetaProperty &property) const;
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void setProperty(const QSharedPointer<Entity> &entiy, QSharedPointer<Entity> value, const QMetaProperty &property) const;
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public:
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EntityManager(QSqlDatabase database);
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EntityManager(const QString &databaseType, QString databasename = "" , QString hostname = "", QString username = "",
QString password = "", QString port = "");
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~EntityManager();
static QStringList getConnectionNames();
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/**
* @brief startup
* @param version must be unique
* @param toInitialize list of entity classnames which database tables should be created
* @return
*/
bool startup(QString version, QStringList toInitialize);
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static void removeConnectionName(const QString &name);
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QSharedPointer<Entity> findById(const qint64 &id, const QString &classname);
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QList<QSharedPointer<Entity>> findEntityByAttributes(const QSharedPointer<Entity> &entity, bool ignoreID = false);
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bool create(QList<QSharedPointer<Entity>> entities);
bool create(QSharedPointer<Entity> &entity);
bool save(QSharedPointer<Entity> &entity);
qint64 findId(QSharedPointer<Entity> &entity);
bool merge(QSharedPointer<Entity> &entity, bool withRelations = true);
bool remove(QSharedPointer<Entity> &entity);
bool removeAll(QString tblname);
bool createTable(const QSharedPointer<Entity> &entity);
qint8 count(const QSharedPointer<Entity> &entity, bool ignoreID = true);
qint8 count(const QString &tableName);
QSharedPointer<Database> getDb() const;
void setDb(const QSharedPointer<Database> &value);
QSharedPointer<Schema> getSchema() const;
void setSchema(const QSharedPointer<Schema> &value);

/**
*@TODO use conditions
*/
template<class T> qint8 count(QHash<QString, QString> condition = QHash<QString, QString>()) {
Entity *e = EntityInstanceFactory::createInstance<T>();
qint8 rc = 0;
if (e) {
rc = this->count(e->getTablename());
delete e;
}
return rc;
}

template<class T> QList<QSharedPointer<Entity>> findAll() {
Entity *e = EntityInstanceFactory::createInstance<T>();
if (e) {
auto maps = this->findAll(e->getTablename());
const char *className = e->getClassname();
delete e;
return this->convert(maps, className);
}
return QList<QSharedPointer<Entity>>();
}

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template<class T> QSharedPointer<Entity> findById(const qint64 &id) {
Entity *e = EntityInstanceFactory::createInstance<T>();
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return this->findById(id, e);
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}
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template<class T> QSharedPointer<Entity> findEntityByAttributes(const QHash<QString, QString> &attributes) {
auto list = this->findAllEntitiesByAttributes<T>(attributes, 1, 0);
if (list.isEmpty()) {
return QSharedPointer<Entity>();
}
return list.at(0);
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}

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template<class T> QList<QSharedPointer<Entity>> findAllEntitiesByAttributes(const QHash<QString, QString> &attributes =
QHash<QString, QString>(), quint32 limit = 0, quint32 offset = 0) {
auto list = this->findAllEntitiesByAttributes<T>(attributes);
return list;
}
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template<class T> QList<QSharedPointer<Entity>> findEntitiesBySql(const QString &sql) {
Entity *e = EntityInstanceFactory::createInstance<T>();
if (e) {
QSqlQuery q = this->schema.data()->getQueryBuilder().data()->getQuery();
q = this->db.data()->select(sql);
auto result = this->convertQueryResult(q);
auto ret = this->convert(result, e->getClassname());
delete e;
return ret;
}
return QList<QSharedPointer<Entity>>();
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}
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template<class T> bool remove(const QList<qint64> &ids) {
bool ok = true;
foreach (qint64 var, ids) {
if (!this->remove<T>(var)) {
ok = false;
break;
}
}
return ok;
}
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template<class T> bool remove(qint64 id) {
Entity *e = EntityInstanceFactory::createInstance<T>();
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if (e) {
QSharedPointer<Entity> ptr = QSharedPointer<Entity>(e);
e->setId(id);
return this->remove(ptr);
}
return false;
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}
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};
}
#endif // ENTITYMANAGER_H