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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 <QObject>
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#include <QSharedPointer>
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#include <QDebug>
#include <QtSql/QSqlError>
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#include <QMetaType>
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#include "schema.h"
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#include "entity.h"
#include "database.h"
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#include "entityinstancefactory.h"
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#include "queryinterpreter.h"
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#include "cache.h"
#include "querybuilder.h"
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namespace CuteEntityManager {
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class Logger;
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class QueryInterpreter;
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class EntityManager : public QObject {
Q_OBJECT
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public slots:
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/**
* @brief startup
* @param version must be unique
* @param toInitialize list of entity classnames which database tables should be created
* @return
*/
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bool startup(QString version, QStringList toInitialize, bool createIndices = false);
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bool executeQuery(const QString &query);
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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,
const bool persistRelations = true);
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bool create(QSharedPointer<Entity> &entity, const bool persistRelations = true,
const bool checkDuplicate = false);
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bool save(QSharedPointer<Entity> &entity, const bool persistRelations = true);
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qint64 findId(QSharedPointer<Entity> &entity);
bool merge(QSharedPointer<Entity> &entity, bool withRelations = true);
bool remove(QSharedPointer<Entity> &entity);
bool removeAll(QString tblname);
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bool createTable(const QSharedPointer<Entity> &entity,
bool createRelationTables = true);
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quint8 count(const QSharedPointer<Entity> &entity, bool ignoreID = true);
quint8 count(const QString &tableName);
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QSharedPointer<Database> getDb() const;
void setDb(const QSharedPointer<Database> &value);
QSharedPointer<Schema> getSchema() const;
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void refresh(QSharedPointer<Entity> &entity);
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void setSchema(const QSharedPointer<Schema> &value);
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QList<QHash<QString, QVariant> > selectByQuery(Query &query);
QList<QHash<QString, QVariant> > selectBySql(const QString &sql);
qint8 count(Query &query);

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public:
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EntityManager(QSqlDatabase database, bool logQueries = false);
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EntityManager(const QString &databaseType, QString databasename = "" ,
QString hostname = "",
QString username = "",
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QString password = "", QString port = "", bool logQueries = false, QString databaseOptions = "");
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~EntityManager();
static QStringList getConnectionNames();
QSharedPointer<QueryBuilder> getQueryBuilder() const;
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template<class T> QList<QSharedPointer<T>> find(Query &q,
const bool joinBaseClasses = false, const bool resolveRelations = true) {
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QSharedPointer<Entity> ptr = QSharedPointer<Entity>
(EntityInstanceFactory::createInstance<T *>());
if (ptr) {
if (q.getFrom().isEmpty()) {
q.setFrom(QStringList(ptr->getTablename()));
}
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if (joinBaseClasses) {
q.appendJoins(this->schema->getQueryBuilder()->joinBaseClasses(ptr));
}
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QSqlQuery query = this->queryInterpreter->build(q);
auto maps = this->convertQueryResult(query);
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auto converted = this->convert(maps, EntityHelper::getClassname(ptr.data()),
resolveRelations);
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return this->convertList<T>(converted);
}
return QList<QSharedPointer<T>>();
}

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template<class T> QList<QSharedPointer<T>> findAll(const bool resolveRelations =
true) {
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QSharedPointer<Entity> ptr = QSharedPointer<Entity>
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(EntityInstanceFactory::createInstance<T *>());
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if (ptr) {
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auto maps = this->findAll(ptr);
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auto converted = this->convert(maps, EntityHelper::getClassname(ptr.data()),
resolveRelations);
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return this->convertList<T>(converted);
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}
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return QList<QSharedPointer<T>>();
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}

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

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template<class T> QList<QSharedPointer<T>> findAllEntitiesByAttributes(
const QHash<QString, QVariant> &attributes =
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QHash<QString, QString>(), quint64 limit = 0, quint64 offset = 0,
bool joinBaseClasses = false, const bool resolveRelations = true) {
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QSharedPointer<Entity> e = QSharedPointer<Entity>
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(EntityInstanceFactory::createInstance<T *>());
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if (e) {
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Query query = Query(QStringList(e->getTablename()));
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if (joinBaseClasses) {
query.appendJoins(this->schema->getQueryBuilder()->joinBaseClasses(e));
}
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query.appendWhere(this->schema->getQueryBuilder()->where(attributes));
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query.setLimit(limit);
query.setOffset(offset);
QSqlQuery q = this->queryInterpreter->build(query);
auto results = this->convertQueryResult(q);
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auto list = this->convert(results, EntityHelper::getClassname(e.data()),
resolveRelations);
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return this->convertList<T>(list);
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}
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return QList<QSharedPointer<T>>();
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}
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template<class T> QList<QSharedPointer<T>> findEntitiesBySql(
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const QString &sql) {
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QSharedPointer<T> e = EntityInstanceFactory::createInstance<T *>();
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if (e) {
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QSqlQuery q = this->schema->getDatabase()->getQuery(sql);
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auto result = this->convertQueryResult(q);
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auto converted = this->convert(result, EntityHelper::getClassname(e));
return this->convertList<T>(converted);
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}
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return QList<QSharedPointer<T>>();
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}
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template<class T> bool remove(const QList<qint64> &ids) {
bool ok = true;
foreach (qint64 var, ids) {
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if (!this->remove<T *>(var)) {
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ok = false;
break;
}
}
return ok;
}
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template<class T> bool remove(qint64 id) {
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Entity *e = EntityInstanceFactory::createInstance<T *>();
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if (e) {
QSharedPointer<Entity> ptr = QSharedPointer<Entity>(e);
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ptr->setId(id);
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return this->remove(ptr);
}
return false;
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}
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protected:
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template<class T> QList<QSharedPointer<T>> convertList(const
QList<QSharedPointer<Entity>> &list) {
QList<QSharedPointer<T>> newList = QList<QSharedPointer<T>>();
for (int i = 0; i < list.size(); ++i) {
newList.append(list.at(i).objectCast<T>());
}
return newList;
}

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void init();
QList<QHash<QString, QVariant> > findAll(const QSharedPointer<Entity> &e);
void resolveRelations(const QSharedPointer<Entity> &entity,
const QHash<QString, QVariant> &map, const bool refresh = false);
QHash<QString, QVariant> findByPk(qint64 id, const QSharedPointer<Entity> &e);
void manyToOne(const QSharedPointer<Entity> &entity, const QVariant &id,
const QMetaProperty &property, const bool refresh = false);
void oneToMany(const QSharedPointer<Entity> &entity, const Relation &r,
const QMetaProperty &property, const bool refresh = false);
void manyToMany(const QSharedPointer<Entity> &entity,
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const QMetaProperty &property, const Relation &relation,
const bool refresh = false);
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void oneToOne(const QSharedPointer<Entity> &entity, const Relation &r,
const QMetaProperty &property, const bool refresh = false,
const QVariant &id = "");
bool canPersistRelation(const Relation &relation, const RelationType &r,
const QVariant &var) const;
void persistManyToMany(const QSharedPointer<Entity> &entity, const Relation &r,
QVariant &property);
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,
bool ignoreID = false);
QSharedPointer<Entity> findById(const qint64 &id, QSharedPointer<Entity> &e,
const bool refresh = false);
void savePrePersistedRelations(const QSharedPointer<Entity> &entity);
void savePostPersistedRelations(const QSharedPointer<Entity> &entity);

QList<QSharedPointer<Entity>> saveRelationEntities(const
QList<QSharedPointer<Entity>> &list, const Relation &r);
void persistMappedByRelation(const QList<QSharedPointer<Entity>> &list,
QSqlQuery &q, const QSharedPointer<Entity> &entity,
const QSharedPointer<Entity> &ptr, const Relation &r,
const QString &tblName);
bool shouldBeSaved(QSharedPointer<Entity> &entity , const Relation &r);
void removeRelations(const QSharedPointer<Entity> &entity);
void removeEntityList(QVariant &var);
void removeManyToManyEntityList(const QSharedPointer<Entity> &e,
const Relation &r, QVariant &var);
void removeEntity(QVariant &var);
void setNullOneToManyRelation(QVariant &var, const Relation &r);
void setNullEntityPropertyRelation(QVariant &var, const Relation &r);
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QSharedPointer<Entity> convert(const QHash<QString, QVariant> &map,
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const char *classname, const bool refresh = false,
const bool resolveRelations = true);
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QList<QSharedPointer<Entity>> convert(QList<QHash<QString, QVariant> > maps,
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const char *classname, const bool refresh = false,
const bool resolveRelations = true);
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void missingManyToManyTable(const QString &tblName,
const QSharedPointer<Entity> &e, const Relation &r);
bool isRelationPropertyValid(const QMetaProperty &prop, const Relation &r,
const QSharedPointer<Entity> &e, const QSharedPointer<Entity> &relatedEntity);
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private:
static QStringList connectionNames;
QSharedPointer<Schema> schema;
static void setConnectionNames(QStringList list);
QSharedPointer<Database> db;
Cache cache;
QString createConnection();
QList<QHash<QString, QVariant> > convertQueryResult(QSqlQuery &q);
bool checkTable(const QSharedPointer<Entity> &entity);
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QSharedPointer<QueryInterpreter> queryInterpreter;
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};
}
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Q_DECLARE_METATYPE(QSharedPointer<CuteEntityManager::Entity>)
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#endif // ENTITYMANAGER_H