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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/>.
*/

#include "database.h"
using namespace CuteEntityManager;

Database::Database(QSqlDatabase database) {
this->database = database;
this->init();
this->connectionName = this->database.connectionName();

}

Database::Database(QString databaseType, QString connectionName,
QString hostname,
QString databasename,
QString username, QString password, qint64 port) {
this->database = QSqlDatabase::addDatabase(databaseType, connectionName);
this->connectionName = connectionName;
if (hostname != QString("")) {
this->database.setHostName(hostname);
}
if (databasename != QString("")) {
this->database.setDatabaseName(databasename);
}
if (username != QString("")) {
this->database.setUserName(username);
}
if (password != QString("")) {
this->database.setPassword(password);
}
if (port != 0) {
this->database.setPort(port);
}
this->init();
}

void Database::init() {
this->database.open();
this->supportTransactions = this->database.driver()->hasFeature(
QSqlDriver::Transactions);
}

Database::~Database() {
if (this->database.isOpen()) {
this->database.close();
}
QSqlDatabase::removeDatabase(this->connectionName);
}

QString Database::getConnectionName() {
return this->connectionName;
}

bool Database::transaction(const QString &query) {
bool rc = false;
if (supportTransactions) {
this->startTransaction();
QSqlQuery sqlquery = QSqlQuery(this->database);
sqlquery.exec(query);
this->commitTransaction();
} else {
rc = this->exec(query);
}
qDebug() << "Executed Query:" << query;
return rc;
}

QSqlQuery Database::getQuery() {
return QSqlQuery(this->database);
}

QSqlQuery Database::getQuery(const QString &prepare) {
QSqlQuery q = QSqlQuery(this->database);
q.prepare(prepare);
return q;
}

bool Database::transaction(const QStringList &queries) {
bool ok = false;
if (this->supportTransactions) {
this->database.transaction();
QSqlQuery sqlquery = QSqlQuery(this->database);
for (int var = 0; var < queries.size(); ++var) {
sqlquery.exec(queries.at(var));
}
ok = this->commitTransaction();
} else {
ok = this->exec(queries);
}
return ok;
}

bool Database::transaction(QSqlQuery &query) {
this->startTransaction();
query.exec();
this->debugQuery(query);
return this->commitTransaction();
}

bool Database::transaction(QList<QSqlQuery> &queries) {
this->startTransaction();
QSqlQuery q;
for (int var = 0; var < queries.size(); ++var) {
q = queries.at(var);
q.exec();
this->debugQuery(q);
}
return this->commitTransaction();
}


bool Database::commitTransaction() {
return this->supportTransactions && this->database.commit();
}

bool Database::rollbackTransaction() {
qDebug() << "Transaction rolled back!" << this->database.lastError().text();
return supportTransactions && this->database.rollback();
}

DatabaseType Database::getDatabaseType(QString s) {
if (s == "qmysql") {
return DatabaseType::MYSQL;
} else if (s == "qpgsql") {
return DatabaseType::PGSQL;
} else {
return DatabaseType::SQLITE;
}
}

QSharedPointer<Schema> Database::getSchema(DatabaseType db,
QSharedPointer<Database> database) {
switch (db) {
case DatabaseType::SQLITE:
return QSharedPointer<Schema>(new SqliteSchema(database));;
break;
// case PGSQL:
// return QSharedPointer<Schema>(new PgSqlSchema());
// break;
// case MYSQL:
// return QSharedPointer<Schema>(new MysqlSchema());
// break;
default:
return QSharedPointer<Schema>(new SqliteSchema(database));
break;
}
}

bool Database::exec(const QString &query) {
QSqlQuery q = QSqlQuery(this->database);
bool ok = q.exec(query);
this->debugQuery(q);
return ok;
}

bool Database::exec(QStringList queries) {
QSqlQuery q = QSqlQuery(this->database);
bool ok = true;
for (int var = 0; var < queries.size() && ok; ++var) {
ok = q.exec(queries.at(var));
this->debugQuery(q);
if (!ok) {
break;
}
}
return ok;
}

bool Database::exec(QSqlQuery &query) {
bool ok = query.exec();
this->debugQuery(query);
return ok;
}

bool Database::exec(QList<QSqlQuery> queries) {
bool ok = true;
QSqlQuery q = QSqlQuery(this->database);
for (int var = 0; var < queries.size() && ok; ++var) {
q = queries.at(var);
ok = q.exec();
this->debugQuery(q);
if (!ok) {
break;
}
}
return ok;
}

void Database::debugQuery(const QSqlQuery &query) const {
qDebug() << query.executedQuery();
}

bool Database::select(QSqlQuery &query) {
query.setForwardOnly(true);
bool ok = query.exec();
this->debugQuery(query);
return ok;
}

QSqlQuery Database::select(const QString &query) {
QSqlQuery q = QSqlQuery(this->database);
q.exec(query);
this->debugQuery(q);
return q;
}

void Database::startTransaction() {
this->database.transaction();
}

QSqlDatabase Database::getDatabase() {
return this->database;
}
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