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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 <QMetaObject>
#include <QRegularExpression>
#include <QStringList>
#include "querybuilder.h"
#include "database.h"
#include "entity.h"
#include "entityinstancefactory.h"
#include "entityhelper.h"
#include "logger.h"

using namespace CuteEntityManager;

QueryBuilder::QueryBuilder(Schema *schema,
QSharedPointer<Database> &database) {
this->schema = schema;
this->database = database;
this->separator = " ";
}

QueryBuilder::~QueryBuilder() {
}

bool QueryBuilder::createTable(const QSharedPointer<Entity> &entity,
bool createRelationTables) const {
bool rc = false;
if (entity) {
auto tableDefinition = this->generateTableDefinition(entity);
QString tableName = entity->getTablename();
this->schema->containsTable(tableName) ? rc = true : rc = false;
if (!rc) {
QSqlQuery q = this->database->getQuery(this->createTable(tableName,
tableDefinition));
if (this->database->exec(q) && (!createRelationTables ||
this->createRelationTables(entity))) {
rc = true;
} else {
this->database->getLogger()->logMsg("Table " + entity->getTablename() +
" could not be created.", MsgType::WARNING);
}
this->schema->getTableSchema(tableName);
}
}
return rc;
}

bool QueryBuilder::createRelationTables(const QSharedPointer<Entity> &entity)
const {
bool ok = true;
auto relTables = this->generateRelationTables(entity);
auto i = relTables.constBegin();
while (i != relTables.constEnd()) {
auto query = this->database->getQuery(this->createTable(i.key(), i.value()));
if (!this->database->exec(query)) {
ok = false;
this->database->getLogger()->logMsg("Relational table for table " +
entity->getTablename() +
" could not be created." + " Tablename:" + i.key(), MsgType::WARNING);
break;
}
++i;
}
return ok;
}

bool QueryBuilder::createIndices(const QSharedPointer<Entity> &entity) const {
bool ok = true;
QStringList queries = QStringList();
QString superIndex = this->createFkSuperClass(entity.data());
if (!superIndex.isEmpty()) {
queries.append(superIndex);
}
queries.append(this->relationFks(entity));
ok = this->database->transaction(queries);
return ok;
}


QStringList QueryBuilder::relationFks(const QSharedPointer<Entity> &entity)
const {
QStringList queries = QStringList();
if (this->supportsForeignKeys()) {
auto relations = EntityHelper::getNonInheritedRelations(entity.data());
auto props = EntityHelper::getMetaProperties(entity.data());
auto iterator = relations.constBegin();
while (iterator != relations.constEnd()) {
auto relation = iterator.value();
if (relation.getMappedBy().isEmpty() && !relation.getCascadeType().isEmpty()) {
QString update = relation.getCascadeType().contains(CascadeType::MERGE)
|| relation.getCascadeType().contains(CascadeType::ALL) ?
this->getForeignKeyCascade(
CASCADE) : this->getForeignKeyCascade(NO_ACTION);
QString remove = relation.getCascadeType().contains(CascadeType::REMOVE)
|| relation.getCascadeType().contains(CascadeType::ALL) ?
this->getForeignKeyCascade(
CASCADE) : this->getForeignKeyCascade(DbForeignKeyCascade::SET_NULL);
this->createRelationFK(queries, entity, relation,
props.value(relation.getPropertyName()), update, remove);
}
++iterator;
}
}
return queries;
}

bool QueryBuilder::supportsForeignKeys() const {
return true;
}

void QueryBuilder::createRelationFK(QStringList &queries,
const QSharedPointer<Entity> &entity, const Relation &relation,
const QMetaProperty &metaProperty, const QString &update,
const QString &remove) const {
auto ptr = QSharedPointer<Entity>
(EntityInstanceFactory::createInstance(metaProperty.type()));
if (ptr) {
if (relation.getType() == RelationType::ONE_TO_ONE
|| relation.getType() == RelationType::MANY_TO_ONE) {
QString indexName = this->generateIndexName(relation.getPropertyName(),
entity->getTablename(),
this->generateColumnNameID(relation.getPropertyName()),
ptr->getTablename(), true);
queries.append(this->addForeignKey(indexName, entity->getTablename(),
QStringList(this->generateColumnNameID(relation.getPropertyName())),
ptr->getTablename(),
QStringList(ptr->getPrimaryKey()), remove, update));
} else if (relation.getType() == RelationType::MANY_TO_MANY) {
QString tableName = this->generateManyToManyTableName(entity, ptr, relation);
queries.append(this->createForeignKeyManyToMany(tableName, entity, update,
remove));
queries.append(this->createForeignKeyManyToMany(tableName, ptr, update,
remove));
}
}
}

QString QueryBuilder::createForeignKeyManyToMany(const QString &tableName,
const QSharedPointer<Entity> &entity, const QString &update,
const QString &remove) const {
QString fkColumn = this->generateManyToManyColumnName(entity, "id");
QString indexName = this->generateIndexName(fkColumn,
tableName, fkColumn,
entity->getTablename(), true);
return this->addForeignKey(indexName, tableName, QStringList(fkColumn),
entity->getTablename(), QStringList(entity->getPrimaryKey()),
remove, update);
}

QString QueryBuilder::createTable(const QString &tableName,
const QHash<QString, QString> &tableDefinition) const {
return this->createTableQuery(tableName,
tableDefinition);
}

QString QueryBuilder::createFkSuperClass(const Entity *e) const {
QString r = "";
if (supportsForeignKeys()) {
auto superMetaObject = e->metaObject()->superClass();
if (e->getInheritanceStrategy() == InheritanceStrategy::JOINED_TABLE
&& QString(superMetaObject->className()) !=
this->entityClassname()) {
Entity *superClass = EntityInstanceFactory::createInstance(
superMetaObject->className());
if (superClass) {
QString refColumn = superClass->getPrimaryKey();
QString refTable = superClass->getTablename();
r = this->addForeignKey(this->generateIndexName(e->getPrimaryKey(),
e->getTablename(), refColumn, refTable, this->supportsForeignKeys()),
e->getTablename(),
QStringList(e->getPrimaryKey()), refTable, QStringList(refColumn),
this->getForeignKeyCascade(CASCADE),
this->getForeignKeyCascade(CASCADE));
delete superClass;
}
}
}
return r;
}

QString QueryBuilder::createTableQuery(const QString &tableName,
const QHash<QString, QString> &tableDefinition) const {
bool first = true;
QString s = "CREATE TABLE " + this->schema->quoteTableName(tableName) + " (";
auto i = tableDefinition.constBegin();
while (i != tableDefinition.constEnd()) {
if (first) {
first = false;
} else {
s += ", ";
}
s += this->schema->quoteColumnName(i.key()) + " " + this->getColumnType(i.value());
++i;
}
s += ");";
return s;
}

QString QueryBuilder::renameTable(QString tableName, QString newName) const {
return "RENAME TABLE " + this->schema->quoteTableName(
tableName) + " TO " +
this->schema->quoteTableName(
newName);
}

QString QueryBuilder::dropTable(QString tableName) const {
return "DROP TABLE " + this->schema->quoteTableName(tableName);
}

QString QueryBuilder::truncateTable(QString tableName) const {
return "TRUNCATE TABLE " + this->schema->quoteTableName(tableName);
}

QString QueryBuilder::addColumn(QString tableName, QString columnName,
QString columnType) const {
return "ALTER TABLE " + this->schema->quoteTableName(
tableName) + " ADD " +
this->schema->quoteColumnName(
columnName) + " " + this->getColumnType(columnType);
}

QString QueryBuilder::dropColumn(QString tableName, QString columName) const {
return "ALTER TABLE " + this->schema->quoteTableName(
tableName) + " DROP COLUMN " +
this->schema->quoteColumnName(columName);
}

QString QueryBuilder::renameColumn(QString tableName, QString oldName,
QString newName) const {
return "ALTER TABLE " + this->schema->quoteTableName(
tableName) + " RENAME COLUMN " +
this->schema->quoteColumnName(oldName) + " TO " +
this->schema->quoteColumnName(
newName);
}

QString QueryBuilder::alterColumn(QString tableName, QString columnName,
QString newType) const {
return "ALTER TABLE " + this->schema->quoteTableName(
tableName) + " CHANGE " +
this->schema->quoteColumnName(columnName) + " " +
this->schema->quoteColumnName(columnName) + this->getColumnType(newType);
}

QString QueryBuilder::addPrimaryKey(QString name, QString tableName,
QStringList columns) const {
return "ALTER TABLE " + this->schema->quoteTableName(
tableName) + " ADD CONSTRAINT " +
this->schema->quoteColumnName(name) + "PRIMARY KEY (" +
this->buildColumns(columns) + " )";
}

QString QueryBuilder::dropPrimaryKey(QString name, QString tableName) const {
return "ALTER TABLE " + this->schema->quoteTableName(
tableName) + " DROP CONSTRAINT " +
this->schema->quoteColumnName(name);
}

QString QueryBuilder::addForeignKey(QString name, QString tableName,
QStringList columns,
QString refTableName,
QStringList refColumns, QString deleteConstraint,
QString updateConstraint) const {
QString r = "ALTER TABLE " + this->schema->quoteTableName(
tableName) + "ADD CONSTRAINT " +
this->schema->quoteColumnName(name)
+ " FOREIGN KEY (" + this->buildColumns(columns) + ")" + " REFERENCES " +
this->schema->quoteTableName(
refTableName) +
" (" + this->buildColumns(refColumns) + ")";
if (!deleteConstraint.isEmpty()) {
r.append(" ON DELETE " + deleteConstraint);
}
if (!updateConstraint.isEmpty()) {
r.append(" ON UPDATE " + updateConstraint);
}
return r;
}

QString QueryBuilder::generateIndexName(const QString &name,
const QString &table, const QString &refColumn, const QString &refTable,
const bool fk) const {
return QString(fk ? "fk" : "idx").append("_").append(name).append(table).append(
refColumn).append(refTable);
}

QString QueryBuilder::generateColumnNameID(QString name) const {
return name.append(this->columnNameIDAppendix());
}

QString QueryBuilder::columnNameIDAppendix() const {
return "_id";
}

QString QueryBuilder::getForeignKeyCascade(DbForeignKeyCascade cascade) const {
QString r = "";
switch (cascade) {
case RESTRICT:
r = "RESTRICT";
break;
case CASCADE:
r = "CASCADE";
break;
case NO_ACTION:
r = "NO ACTION";
break;
case SET_DEFAULT:
r = "SET DEFAULT";
break;
case SET_NULL:
r = "SET NULL";
break;
}
return r;
}

QString QueryBuilder::dropForeignKey(QString name, QString tableName) const {
return "ALTER TABLE " + this->schema->quoteTableName(
tableName) + " DROP CONSTRAINT " +
this->schema->quoteColumnName(name);
}

QString QueryBuilder::createIndex(QString name, QString tableName,
QStringList columns,
bool unique) const {
QString s = (unique ? "CREATE UNIQUE INDEX " : "CREATE INDEX ") +
this->schema->quoteTableName(
name) + " ON " + this->schema->quoteTableName(tableName) + " (";
s.append(this->buildColumns(columns));
s.append(");");
return s;
}

QString QueryBuilder::dropIndex(QString name, QString tableName) const {
return "DROP INDEX " + this->schema->quoteTableName(name) + " ON " +
this->schema->quoteTableName(
tableName);
}

QSharedPointer<Database> QueryBuilder::getDatabase() const {
return this->database;
}

void QueryBuilder::setDatabase(const QSharedPointer<Database> &value) {
database = value;
}

QString QueryBuilder::buildCreateQuery(QHash<QString, QVariant>::const_iterator
i,
QHash<QString, QVariant>::const_iterator end,
QString &p1, QString &p2) const {
bool first = true;
while (i != end) {
if (!first) {
p1 += ",";
p2 += ",";
} else {
first = false;
}
p1 += this->schema->quoteColumnName(i.key());
p2 += this->placeHolder(i.key());
++i;
}
p1 += ")";
p2 += ");";
return p1 + p2;
}

QHash<QString, QString> QueryBuilder::generateTableDefinition(
const QSharedPointer<Entity> &entity)
const {
auto map = QHash<QString, QString>();
auto o = entity->metaObject();
auto superMetaObject = entity->metaObject()->superClass();
auto superMetaObjectPropertyMap = EntityHelper::getSuperMetaProperties(
entity.data());
QHash<QString, Relation> relations = entity->getRelations();
for (int var = 0; var < o->propertyCount(); ++var) {
auto m = o->property(var);
if ((!superMetaObjectPropertyMap.contains(QString(m.name()))
|| entity->getInheritanceStrategy() == InheritanceStrategy::PER_CLASS_TABLE)
&& m.name() != QString("objectName")
&& !entity->getTransientAttributes().contains(m.name())) {
if (m.isEnumType()) {
map.insert(m.name(), this->schema->getTypeMap()->value(
this->schema->TYPE_INTEGER));
} else if (relations.contains(m.name())) {
Relation r = relations.value(m.name());
if (r.getType() == RelationType::MANY_TO_ONE
|| (r.getType() == RelationType::ONE_TO_ONE
&& r.getMappedBy().isEmpty())) {
map.insert(this->generateColumnNameID(QString(m.name())),
this->schema->TYPE_BIGINT);
}
} else if (entity->getBLOBColumns().contains(m.name())) {
map.insert(m.name(), this->schema->getTypeMap()->value(
this->schema->TYPE_BINARY));
} else {
map.insert(m.name(), this->transformAbstractTypeToRealDbType(
this->transformTypeToAbstractDbType(
m.typeName())));
}
}
}
if (QString(superMetaObject->className()) ==
this->entityClassname()
|| entity->getInheritanceStrategy() == InheritanceStrategy::PER_CLASS_TABLE) {
map.insert(entity->getPrimaryKey(), this->schema->TYPE_BIGPK);
} else {
map.insert(entity->getPrimaryKey(), this->schema->TYPE_BIGINT);
}
return map;
}

/**
* @todo Fix TableName Generation with Inheritence
* @brief QueryBuilder::generateManyToManyTableName
* @param firstEntity
* @param secondEntity
* @param r
* @return
*/
QString QueryBuilder::generateManyToManyTableName(const QSharedPointer<Entity>
&firstEntity,
const QSharedPointer<Entity> &secondEntity, const Relation &r) const {
auto ptr = firstEntity;
QString attributeName = r.getPropertyName();
if (!r.getMappedBy().isEmpty()) {
ptr = secondEntity;
attributeName = r.getMappedBy();
}
auto obj = EntityHelper::getBaseClassObject(ptr, attributeName);
QString tblName = this->generateManyToManyTableName(obj->getTablename(), attributeName);
delete obj;
return tblName;
}

QString QueryBuilder::generateManyToManyTableName(const QString &tableName,
const QString &attribute) const {
return tableName + "_" + attribute;
}

QHash<QString, QHash<QString, QString>> QueryBuilder::generateRelationTables(
const QSharedPointer<Entity> &entity) const {
auto relations = QHash<QString, QHash<QString, QString>>();
QHash<QString, Relation> m = (entity->getInheritanceStrategy() ==
InheritanceStrategy::PER_CLASS_TABLE ? entity->getRelations() :
EntityHelper::getNonInheritedRelations(entity.data()));
auto props = EntityHelper::getMetaProperties(entity.data());
for (auto i = m.begin(); i != m.end(); ++i) {
Relation r = i.value();
if (r.getType() == RelationType::MANY_TO_MANY && r.getMappedBy().isEmpty()) {
QHash<QString, QString> h = QHash<QString, QString>();
h.insert(entity->getPrimaryKey(), this->schema->TYPE_BIGPK);
h.insert(this->generateManyToManyColumnName(entity, r.getPropertyName()),
this->schema->TYPE_BIGINT);
auto meta = props.value(r.getPropertyName());
QSharedPointer<Entity> ptr = QSharedPointer<Entity>
(EntityInstanceFactory::createInstance(EntityInstanceFactory::extractEntityType(
QMetaType::typeName(meta.userType()))));
h.insert(this->generateManyToManyColumnName(ptr, r.getMappedBy()),
this->schema->TYPE_BIGINT);
relations.insert(this->generateManyToManyTableName(entity, ptr, r), h);
}
}
return relations;
}


QString QueryBuilder::transformTypeToAbstractDbType(QString typeName) const {
auto m = this->schema->getAbstractTypeMap();
if (m->contains(typeName)) {
return m->value(typeName);
}
for (auto i = m->begin(); i != m->end(); ++i) {
if (i.key().contains(typeName)) {
return i.value();
}
}
return this->schema->TYPE_TEXT;
}

QString QueryBuilder::transformAbstractTypeToRealDbType(
QString typeName) const {
return this->schema->getTypeMap()->value(typeName);
}

QString QueryBuilder::getColumnType(const QString &type) const {
auto tMap = this->schema->getTypeMap();
if (tMap->contains(type)) {
return this->transformAbstractTypeToRealDbType(type);
}
QRegularExpression reg = QRegularExpression(
QRegularExpression::escape("/^(\\w+)\\((.+?)\\)(.*)$/"));
#if QT_VERSION >= QT_VERSION_CHECK(5, 4, 0)
reg.optimize();
#endif
QRegularExpressionMatchIterator i = reg.globalMatch(type, 0,
QRegularExpression::PartialPreferFirstMatch);
short s = 0;
QString before = "";
while (i.hasNext() && s < 2) {
before = i.next().captured();
if (tMap->contains(before)) {
return before.replace(QRegularExpression::escape("/\\(.+\\)/"),
"(" + i.next().captured() + ")");
}
s++;
}
reg = QRegularExpression(QRegularExpression::escape("/^(\\w+)\\s+/"));
i = reg.globalMatch(type, 0, QRegularExpression::PartialPreferFirstMatch);
if (i.hasNext()) {
return before.replace(QRegularExpression::escape("/^w+/"), i.next().captured());
}
return type;
}

QSqlQuery QueryBuilder::find(const qint64 &id, const QString &tableName) const {
QString pk = "id";
QSqlQuery q = this->database->getQuery(this->selectBase(QStringList(
tableName)) + " WHERE " + this->schema->quoteColumnName(
pk) + " = " + this->placeHolder(pk) + " LIMIT 1;");
this->bindValue(pk, id, q);
return q;
}

QString QueryBuilder::selectBase(const QStringList &tables,
const QStringList &columns, bool withKeyword) const {
QString r = "";
if(withKeyword) {
r = "SELECT ";
}
if (columns.isEmpty()) {
r += "*";
} else {
for (int var = 0; var < columns.size(); ++var) {
if (var != 0) {
r += " ";
}
r += this->schema->quoteColumnName(columns.at(var));
}
}
r += " " + this->fromKeyword();
for (int var = 0; var < tables.size(); ++var) {
r += " ";
r += this->schema->quoteTableName(tables.at(var));
}
return r;
}

QSqlQuery QueryBuilder::find(const qint64 &id,
const QSharedPointer<Entity> &entity, qint64 offset, QString pk) const {
QSqlQuery q = this->database->getQuery(this->selectBase(QStringList(
entity->getTablename())) + this->joinSuperClasses(
entity) + " WHERE " + this->schema->quoteColumnName(entity->getTablename() + "."
+ pk) + this->equalOperator() + " " + this->placeHolder(pk) + this->limit(1, offset));
this->bindValue(pk, id, q);
return q;
}

QSqlQuery QueryBuilder::findAll(const QSharedPointer<Entity> &entity,
const qint64 limit, qint64 offset) {
return this->database->getQuery(this->selectBase(QStringList(
entity->getTablename())) + " " + this->joinSuperClasses(
entity) + this->limit(limit, offset) + ";");
}

Query QueryBuilder::findByAttributes(const QHash<QString, QVariant> &m,
const QString &tableName,
const bool &ignoreID, const qint64 limit, const qint64 offset) const {
Query q = Query();
q.setSelect(QStringList(this->selectBase(QStringList(
tableName),QStringList(),false)));
q.appendWhere(Expression(this->where(m, this->andKeyword(), ignoreID, "id", false), m));
q.setLimit(limit);
q.setOffset(offset);
return q;
}

Query QueryBuilder::findByAttributes(const QSharedPointer<Entity> &e,
bool ignoreID,
const qint64 limit,
const qint64 offset) {
QHash<QString, QVariant> values = EntityHelper::getEntityAttributes(
EntityHelper::getMetaProperties(e.data()), e);
return this->findByAttributes(values, e->getTablename(), ignoreID, limit,
offset);
}

QSqlQuery QueryBuilder::findAll(const QString &tableName) const {
return this->database->getQuery(this->selectBase(QStringList(tableName)) + ";");
}

QList<QSqlQuery> QueryBuilder::remove(const QSharedPointer<Entity> &entity)
const {
QList<QSqlQuery> queries = QList<QSqlQuery>();
queries.append(this->remove(entity->getTablename(),
entity->getProperty(entity->getPrimaryKey()).toLongLong()));
if (entity->getInheritanceStrategy() != InheritanceStrategy::PER_CLASS_TABLE
&& entity->isInheritanceCascaded()) {
auto classes = EntityHelper::superClasses(entity.data(), true);
for (int var = 0; var < classes.size(); ++var) {
auto item = classes.at(var);
auto instance = EntityInstanceFactory::createInstance(item->className());
if (instance) {
queries.append(this->remove(instance->getTablename(),
entity->getProperty(entity->getPrimaryKey()).toLongLong()));
delete instance;
instance = 0;
}
}
}
return queries;
}


QSqlQuery QueryBuilder::remove(const QString &tableName,
const qint64 &id, const QString &primaryKey) const {
QSqlQuery q = this->database->getQuery("DELETE FROM " +
this->schema->quoteTableName(
tableName) + " WHERE " +
this->schema->quoteColumnName(primaryKey) + "=" + this->placeHolder(
primaryKey) + ";");
this->bindValue(primaryKey, id, q);
return q;
}

QSqlQuery QueryBuilder::findId(const QSharedPointer<Entity> &entity) const {
QHash<QString, QVariant> values = EntityHelper::getEntityAttributes(
EntityHelper::getMetaProperties(entity.data()),
entity);
QSqlQuery q = this->database->getQuery(this->selectBase(QStringList(
entity->getTablename()),
QStringList(entity->getPrimaryKey())) + this->where(values,
this->andKeyword(), true) + " LIMIT 1");
this->bindValues(values, q);
return q;
}

QSqlQuery QueryBuilder::count(const QString &tableName) const {
QSqlQuery q = this->database->getQuery(this->selectBase(QStringList(
tableName), QStringList(this->countFunction())) + ";");
return q;
}

QList<QSqlQuery> QueryBuilder::merge(const QSharedPointer<Entity> &entity)
const {
return this->createOrMerge(entity, false);
}


QList<QSqlQuery> QueryBuilder::createOrMerge(const QSharedPointer<Entity>
&entity, bool insert) const {
const QList<ClassAttributes> attrs = this->inheritedAttributes(entity);
auto queries = QList<QSqlQuery>();
bool first = true;
for (int var = 0; var < attrs.size(); ++var) {
auto attr = attrs.at(var);
auto attrHash = attr.getAttributes();
queries.append(insert ? this->insert(attr.getName(), attrHash,
attr.getPk(), !first) : this->update(attr.getName(), attrHash, attr.getPk()));
if (first) {
first = false;
}
}
return queries;
}

QList<QSqlQuery> QueryBuilder::create(const QSharedPointer<Entity> &entity)
const {
return this->createOrMerge(entity, true);
}

QSqlQuery QueryBuilder::removeAll(const QString &tableName) const {
return this->database->getQuery(this->truncateTable(tableName));
}

QSqlQuery QueryBuilder::insert(const QString &tableName,
QHash<QString, QVariant> &attributes, const QString &primaryKey,
bool withId) const {
if (!withId) {
attributes.remove(primaryKey);
}
QSqlQuery q = this->database->getQuery();
QString p1 = "INSERT INTO " + this->schema->quoteTableName(
tableName) + "(";
QString p2 = "VALUES(";
if (!attributes.isEmpty()) {
q.prepare(this->buildCreateQuery(attributes.constBegin(), attributes.constEnd(),
p1, p2));
}
this->bindValues(attributes, q);
return q;
}

QSqlQuery QueryBuilder::update(const QString &tableName,
QHash<QString, QVariant> &attributes, const QString &primaryKey) const {
QVariant pk = attributes.value(primaryKey);
attributes.remove(primaryKey);
QSqlQuery q = this->database->getQuery("UPDATE " + this->schema->quoteTableName(
tableName) + " SET " + this->attributes(attributes,
false) + " " + this->whereKeyword()
+ " " +
this->schema->quoteColumnName(primaryKey) + " = " + this->placeHolder(
primaryKey) + ";");
this->bindValues(attributes, q);
this->bindValue(primaryKey, pk, q);
return q;
}


Query QueryBuilder::oneToMany(const QString &tableName,
const QString &attribute,
const qint64 &id,
const qint64 &limit) {
QHash<QString, QVariant> values = QHash<QString, QVariant>();
values.insert(attribute, id);
return this->findByAttributes(values, tableName, false, limit);
}

QSqlQuery QueryBuilder::manyToMany(const QString &tableName,
const QString &attribute,
const qint64 &id) {
QSqlQuery q = this->database->getQuery();
QString sql = this->selectBase(QStringList(tableName), QStringList("*"));
QString pk = "id";
sql += " " + this->whereKeyword() + " ";
sql += this->schema->quoteColumnName(
attribute);
sql += " " + this->equalOperator() + " " + this->placeHolder(pk) + ";";
q.prepare(sql);
this->bindValue(pk, id, q);
return q;
}

QSqlQuery QueryBuilder::manyToManyDelete(const QString &tableName,
const QString &attribute, const qint64 &id) {
QSqlQuery q = this->database->getQuery();
QString pkCol = "id";
QString sql = "DELETE FROM " + this->schema->quoteTableName(
tableName) + " WHERE " + this->schema->quoteColumnName(
attribute) + this->equalOperator() + this->placeHolder(pkCol);
q.prepare(sql);
this->bindValue(pkCol, id, q);
return q;
}

QSqlQuery QueryBuilder::manyToManyInsert(const QString &tableName,
const QString &col1, const QString &col2) const {
QSqlQuery q = this->database->getQuery();
QString sql = "INSERT INTO " + this->schema->quoteTableName(
tableName) + "(" + col1 + "," + col2 + ")"
+ "VALUES(?, ?);";
q.prepare(sql);
return q;
}

QString QueryBuilder::superClassColumnName(const QMetaObject *&superMeta)
const {
return QString(superMeta->className()).toLower();
}

QString QueryBuilder::addWildcard(QVariant var, JokerPosition jp,
QChar jokerChar) const {
QString val = var.toString();
if (!val.isEmpty()) {
switch (jp) {
case JokerPosition::BEHIND:
val += jokerChar;
break;
case JokerPosition::BOTH:
val = jokerChar + val + jokerChar;
break;
case JokerPosition::FRONT:
val = jokerChar + val;
break;
case JokerPosition::NONE:
break;
default:
break;
}
}
return val;
}

QString QueryBuilder::countFunction(const QString &distinctColumn) const {
return QString(this->countKeyword() + "(" + (distinctColumn.isEmpty() ? "*" :
(this->distinct() +
this->schema->quoteColumnName(distinctColumn))) + ")");
}

QString QueryBuilder::distinct() const {
return "DISTINCT";
}

QString QueryBuilder::notKeyword() const {
return "NOT";
}

QString QueryBuilder::between() const {
return "BETWEEN";
}

QString QueryBuilder::andKeyword() const {
return "AND";
}

QString QueryBuilder::orKeyword() const {
return "OR";
}

QString QueryBuilder::inKeyword() const {
return "IN";
}

QString QueryBuilder::whereKeyword() const {
return "WHERE";
}

QString QueryBuilder::countKeyword() const {
return "COUNT";
}

QString QueryBuilder::notEqualOperator() const {
return "!=";
}

QString QueryBuilder::equalOperator() const {
return "=";
}

QString QueryBuilder::fromKeyword() const {
return "FROM";
}

QString QueryBuilder::isNullKeywords() const {
return "IS NULL";
}

QString QueryBuilder::isNotNullKeywords() const {
return "IS NOT NULL";
}

Expression QueryBuilder::inFunction(QString column,
QList<QVariant> values, bool notOp) const {
QString condition = "";
Expression exp = Expression();
if (!values.isEmpty()) {
bool first = true;
condition = this->schema->quoteColumnName(column) + " " + this->appendNot(
notOp) + this->inKeyword() +
" (";
for (int var = 0; var < values.size(); ++var) {
if (first) {
first = false;
} else {
condition += ", ";
}
QString paramName = column + "_in" + var;
condition += this->placeHolder(paramName);
exp.appendParam(paramName, values.at(var));
}
condition += ")";
}
exp.setExpression(condition);
return exp;
}

QString QueryBuilder::between(QString colName, QString valName1,
QString valName2, bool notOp) const {
return "(" + this->schema->quoteColumnName(colName) + (notOp ? (" " +
this->notKeyword() + " ") : " ") + this->between() +
" " + this->placeHolder(valName1) + " " + this->andKeyword() + " " +
this->placeHolder(valName2) + ")";
}

QString QueryBuilder::likeKeyword() const {
return "LIKE";
}

QString QueryBuilder::limitKeyword() const {
return "LIMIT";
}

QString QueryBuilder::offsetKeyword() const {
return "OFFSET";
}

QString QueryBuilder::appendNot(bool notOp) const {
return (notOp ? (this->notKeyword() + " ") : "");
}

QString QueryBuilder::entityClassname() const {
return QString("CuteEntityManager::Entity");
}

Schema *QueryBuilder::getSchema() const {
return schema;
}

QStringList QueryBuilder::quoteTableNames(const QStringList &tables) {
QStringList r = QStringList();
for (int i = 0; i < tables.size(); ++i) {
r.append(this->schema->quoteTableName(tables.at(i)));
}
return r;
}

QString QueryBuilder::getSeparator() const {
return separator;
}

void QueryBuilder::setSeparator(const QString &value) {
separator = value;
}


QString QueryBuilder::limit(const quint64 &limit, const quint64 &offset,
bool withSpace) const {
QString s = "";
if (limit > 0) {
s.append((withSpace ? " " : "") + this->limitKeyword() + " ").append(
QString::number(limit));
}
if (offset > 0) {
s.append((withSpace ? " " : "") + this->offsetKeyword() + " ").append(
QString::number(offset));
}
return s;
}

QString QueryBuilder::generateManyToManyColumnName(const QSharedPointer<Entity>
&entity, QString attribute) const {
if (entity) {
auto obj = EntityHelper::getBaseClassObject(entity, attribute);
QString tblName = obj->getTablename();
delete obj;
return this->generateColumnNameID(tblName);
}
this->database->getLogger()->logMsg("Entity is empty!", MsgType::WARNING);
return "";
}

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


QHash<QString, QVariant> QueryBuilder::saveAttributes(const
QSharedPointer<Entity> &entity, QHash<QString, QMetaProperty> props,
QHash<QString, Relation> relations) const {
if (props.isEmpty()) {
props = EntityHelper::getMetaProperties(entity.data());
}
auto values = EntityHelper::getEntityAttributes(props, entity);
auto relValues = this->getManyToOneAttributes(props, entity, relations);
auto iterator = relValues.constBegin();
while (iterator != relValues.constEnd()) {
values.insert(iterator.key(), iterator.value());
++iterator;
}
return values;
}

QHash<QString, QMetaProperty> QueryBuilder::processProperties(
const QSharedPointer<Entity> &e,
QHash<QString, QMetaProperty> &usedProperties) const {
auto properties = EntityHelper::getMetaProperties(e.data());
QMutableHashIterator<QString, QMetaProperty> i(properties);
while (i.hasNext()) {
i.next();
if (usedProperties.contains(i.key()) && i.key() != e->getPrimaryKey()) {
properties.remove(i.key());
} else {
usedProperties.insert(i.key(), i.value());
}
}
return properties;
}

QHash<QString, Relation> QueryBuilder::processRelations(
const QSharedPointer<Entity> &e,
QHash<QString, Relation> &usedRelations) const {
auto relations = e->getRelations();
auto i = QMutableHashIterator<QString, Relation>(relations);
while (i.hasNext()) {
i.next();
if (usedRelations.contains(i.key())) {
relations.remove(i.key());
} else {
usedRelations.insert(i.key(), i.value());
}
}
return relations;
}

QList<QueryBuilder::ClassAttributes> QueryBuilder::inheritedAttributes(
const QSharedPointer<Entity> &entity) const {
auto list = QList<QueryBuilder::ClassAttributes>();
if (entity->getInheritanceStrategy() == InheritanceStrategy::JOINED_TABLE) {
auto classes = QList<const QMetaObject *>();
classes.append(entity->metaObject());
classes.append(EntityHelper::superClasses(entity.data(), true));
auto usedProperties = QHash<QString, QMetaProperty>();
auto usedRelations = QHash<QString, Relation>();
QSharedPointer<Entity> e;
for (int var = classes.size() - 1; var >= 0; --var) {
auto metaObj = classes.at(var);
e = QSharedPointer<Entity>(EntityInstanceFactory::createInstance(metaObj));
if (e) {
list.append(QueryBuilder::ClassAttributes(e->getTablename(),
this->saveAttributes(entity, this->processProperties(e, usedProperties),
this->processRelations(e, usedRelations)), e->getPrimaryKey()));
} else {
this->database->getLogger()->logMsg("Instance of " + QString(
metaObj->className()) +
" could not be created", MsgType::CRITICAL);
break;
}
}
} else {
list.append(QueryBuilder::ClassAttributes(entity->getTablename(),
this->saveAttributes(entity), entity->getPrimaryKey()));
}
return list;
}

QString QueryBuilder::leftJoin(const QString &foreignTable,
const QString &tableName, const QString &foreignKey,
const QString &primaryKey, bool onlyCondition) const {
return (!onlyCondition ? ("LEFT JOIN " + this->schema->quoteTableName(
foreignTable) + " ON ") : "") +
this->schema->quoteColumnName(foreignTable + "." + primaryKey) + "=" +
this->schema->quoteColumnName(
tableName + "." + foreignKey);
}

QHash<QString, QVariant> QueryBuilder::getManyToOneAttributes(
QHash<QString, QMetaProperty>
props,
const QSharedPointer<Entity> &entity,
QHash<QString, Relation> relations) const {
auto map = QHash<QString, QVariant>();
if (relations.isEmpty()) {
relations = entity->getRelations();
}
auto i = relations.constBegin();
while (i != relations.constEnd()) {
Relation r = i.value();
if ((r.getType() == RelationType::MANY_TO_ONE && props.contains(i.key()))
|| (r.getType() == RelationType::ONE_TO_ONE && r.getMappedBy().isEmpty())) {
auto v = props.value(i.key()).read(entity.data());
if (v.isValid()) {
QSharedPointer<Entity> e = EntityInstanceFactory::castQVariant(v);
if (e) {
this->insertRelationId(e.data(), map, i.key());
}
}
}
++i;
}
return map;
}

void QueryBuilder::insertRelationId(const Entity *e,
QHash<QString, QVariant> &map,
QString relName) const {
if (e && e->getProperty(e->getPrimaryKey()).toLongLong() > -1) {
map.insert(this->generateColumnNameID(relName),
e->getProperty(e->getPrimaryKey()));
}
}

QString QueryBuilder::buildColumns(const QStringList &columns) const {
QString r = "";
bool first = true;
for (int var = 0; var < columns.size(); ++var) {
if (!first) {
r.append(",");
} else {
first = false;
}
r.append(columns.at(var));
}
return r;
}

void QueryBuilder::bindValues(const QHash<QString, QVariant> &h, QSqlQuery &q,
bool ignoreID, const QString &primaryKey) const {
QHash<QString, QVariant>::const_iterator i = h.constBegin();
while (i != h.constEnd()) {
if ((!ignoreID || !(i.key() == primaryKey))
&& !i.value().isNull()) {
this->bindValue(i.key(), i.value(), q);
}
++i;
}
}

void QueryBuilder::bindValue(const QString &key, const QVariant &value,
QSqlQuery &q) const {
q.bindValue(this->placeHolder(key), value);
}

QString QueryBuilder::placeHolder(QString key) const {
return QString(":" + key.replace('.', '_'));
}

QString QueryBuilder::where(const QHash<QString, QVariant> &m,
const QString &conjunction,
bool ignoreID, const QString &primaryKey, bool withKeyword) const {
if (m.size() == 0 || (ignoreID && m.contains(primaryKey) && m.size() == 1)) {
return "";
}
return (withKeyword ? " WHERE " : "") + this->attributes(m, true, conjunction,
ignoreID, primaryKey);
}

QString QueryBuilder::where(const QString &key, const QVariant &var, bool withKeyword,
bool select, bool notEqual) const {
QString r = (withKeyword ? " WHERE " : "");
r += this->schema->quoteColumnName(key) + (var.isNull() && select
? (" " + (notEqual ? this->isNotNullKeywords() : this->isNullKeywords()))
: (notEqual ? this->notEqualOperator() : this->equalOperator() ) + this->placeHolder(
key));
return r;
}

QString QueryBuilder::attributes(const QHash<QString, QVariant> &m, bool select,
const QString &conjunction,
bool ignoreID, const QString &primaryKey) const {
QString rc = "";
for (auto i = m.constBegin(); i != m.constEnd(); ++i) {
if (!ignoreID || i.key() != primaryKey) {
if (!rc.isEmpty()) {
rc += " " + conjunction + " ";
}
rc += this->where(i.key(), i.value(), false, select);
}
}
return rc;
}

QueryBuilder::ClassAttributes::ClassAttributes(const QString name,
const QHash<QString, QVariant> attributes, QString pk) {
this->name = name;
this->attributes = attributes;
this->pk = pk;
}

QString QueryBuilder::ClassAttributes::getName() const {
return name;
}

void QueryBuilder::ClassAttributes::setName(const QString &value) {
name = value;
}

QHash<QString, QVariant> QueryBuilder::ClassAttributes::getAttributes() const {
return attributes;
}

void QueryBuilder::ClassAttributes::setAttributes(const QHash<QString, QVariant>
&value) {
attributes = value;
}

QString QueryBuilder::ClassAttributes::getPk() const {
return pk;
}

void QueryBuilder::ClassAttributes::setPk(const QString &value) {
pk = value;
}

Expression QueryBuilder::andOperator(QHash<QString, QVariant> conditions)
const {
bool first = true;
Expression exp = Expression();
QString condition = "";
for (auto var = conditions.constBegin(); var != conditions.constEnd(); ++var) {
if (first) {
first = false;
} else {
condition += " " + this->andKeyword() + " ";
}
condition += this->schema->quoteColumnName(var.key()) + " = " +
this->placeHolder(var.key());
exp.appendParam(var.key(), var.value());
}
exp.setExpression(condition);
return exp;
}

Expression QueryBuilder::andOperator() const {
return this->plainAnd();
}

Expression QueryBuilder::nandOperator() const {
return this->plainNand();
}

Expression QueryBuilder::arbitraryOperator(QString op, QString column,
QVariant value) const {
Expression exp = Expression(this->schema->quoteColumnName(
column) + " " + op + " " +
this->placeHolder(column));
exp.appendParam(column, value);
return exp;
}

Expression QueryBuilder::isNull(QString column) const {
return Expression(this->schema->quoteColumnName(column) + this->isNullKeywords());
}

Expression QueryBuilder::isNotNull(QString column) const {
return Expression(this->schema->quoteColumnName(column) + this->isNotNullKeywords());
}

Expression QueryBuilder::plainOr() const {
return Expression(this->orKeyword());
}

Expression QueryBuilder::plainNor() const {
return Expression(this->notKeyword() + " " + this->orKeyword());
}

Expression QueryBuilder::plainAnd() const {
return Expression(this->andKeyword());
}

Expression QueryBuilder::plainNand() const {
return Expression(this->notKeyword() + " " + this->andKeyword());
}

Expression QueryBuilder::like(QString column, QVariant value,
JokerPosition jp, QChar wildcard) {
return this->arbitraryOperator(this->likeKeyword(), column,
this->addWildcard(value, jp, wildcard));
}

Expression QueryBuilder::like(QHash<QString, QVariant> conditions,
QString conjunction,
JokerPosition jp, QChar wildcard) {
Expression exp = Expression();
QString condition = "(";
if (!conditions.isEmpty()) {
bool first = true;
for (auto i = conditions.constBegin(); i != conditions.constEnd(); ++i) {
if (first) {
first = false;
} else {
condition += conjunction;
}
condition += this->schema->quoteColumnName(i.key()) + " " + this->likeKeyword()
+ " " +
this->placeHolder(i.key());
QString newVal = this->addWildcard(i.value(), jp, wildcard);
exp.appendParam(i.key(), newVal.isEmpty() ? i.value() : newVal);
}
condition += ")";
exp.setExpression(condition);
}
return exp;
}

Join QueryBuilder::joinClasses(const QSharedPointer<Entity> &mainEntity,
const QSharedPointer<Entity> &foreignEntity, const QString &joinType) const {
Join j = Join(foreignEntity->getTablename(),
this->leftJoin(foreignEntity->getTablename(), mainEntity->getTablename(),
foreignEntity->getPrimaryKey(), mainEntity->getPrimaryKey(), true));
j.setType(joinType);
return j;
}

QList<Join> QueryBuilder::joinBaseClasses(const QSharedPointer<Entity>
&entity) {
auto classes = EntityHelper::superClasses(entity.data(), true);
QList<Join> joins = QList<Join>();
for (int var = 0; var < classes.size(); ++var) {
auto metaObject = classes.at(var);
QSharedPointer<Entity> e = QSharedPointer<Entity>
(EntityInstanceFactory::createInstance(metaObject->className()));
if (e) {
joins.append(this->joinClasses(entity, e));
}
}
return joins;
}

QString QueryBuilder::joinSuperClasses(const QSharedPointer<Entity> &entity)
const {
auto classes = EntityHelper::superClasses(entity.data(), true);
QString joined = "";
for (int var = 0; var < classes.size(); ++var) {
auto metaObject = classes.at(var);
Entity *e = EntityInstanceFactory::createInstance(metaObject->className());
if (e) {
joined.append(" ");
joined.append(this->leftJoin(e->getTablename(), entity->getTablename(),
e->getPrimaryKey(), entity->getPrimaryKey()));
}
delete e;
e = nullptr;
}
return joined;
}

Expression QueryBuilder::where(QHash<QString, QVariant> conditions,
QString conjunction) const {
Expression exp = Expression(this->where(conditions, conjunction, false, "id",
false));
for (auto i = conditions.constBegin(); i != conditions.constEnd(); ++i) {
exp.appendParam(i.key(), i.value());
}
return exp;
}

Expression QueryBuilder::where(QString c, QVariant value) {
Expression exp;
if(value.type() == QVariant::Hash) {
auto values = value.toHash();
exp = Expression(c);
for (auto i = values.constBegin(); i != values.constEnd(); ++i) {
exp.appendParam(i.key(), i.value());
}
} else {
QString placeholder = c + "_where";
exp = Expression(this->schema->quoteColumnName(c) + "=" +
this->placeHolder(placeholder));
exp.appendParam(placeholder, value);
}
return exp;
}

Expression QueryBuilder::equal(QString &key, QVariant &value) {
Expression exp = Expression(this->where(key, value, false, true, false), key, value);
return exp;
}

Expression QueryBuilder::notEqual(QString &key, QVariant &value) {
Expression exp = Expression(this->where(key, value, false, true, true));
exp.appendParam(key, value);
return exp;
}

Expression QueryBuilder::between(QString column, QVariant firstValue,
QVariant secondValue) const {
QString firstPh = column + "_bet1";
QString secondPh = column + "_bet2";
return this->appendCondition(firstPh, secondPh, firstValue, secondValue,
this->between(column, firstPh, secondPh));
}

Expression QueryBuilder::notBetween(QString column, QVariant firstValue,
QVariant secondValue) const {
QString firstPh = column + "_nbet1";
QString secondPh = column + "_nbet2";
return this->appendCondition(firstPh, secondPh, firstValue, secondValue,
this->between(column, firstPh, secondPh, true));
}


Expression QueryBuilder::appendCondition(QString ph1, QString ph2,
QVariant val1, QVariant val2, QString condition) const {
Expression exp = Expression(condition);
exp.appendParam(ph1, val1);
exp.appendParam(ph2, val2);
return exp;
}

Expression QueryBuilder::in(QString column, QList<QVariant> values) const {
return this->inFunction(column, values);
}

Expression QueryBuilder::notIn(QString column, QList<QVariant> values) const {
return this->inFunction(column, values, true);
}

Expression QueryBuilder::notOperator(QString op, QString column,
QVariant value) const {
Expression e = this->arbitraryOperator(op, column, value);
e.setExpression(this->notKeyword() + " " + e.getExpression());
return e;
}

Expression QueryBuilder::orOperator(
QHash<QString, QVariant> conditions, bool like) const {
Expression exp = Expression();
if (!conditions.isEmpty()) {
QString condition = "(";
bool first = true;
for (auto i = conditions.constBegin(); i != conditions.constEnd(); ++i) {
if (first) {
first = false;
} else {
condition += " " + this->orKeyword() + " ";
}
condition += this->schema->quoteColumnName(i.key()) + (like ? " " +
this->likeKeyword() + " " : this->equalOperator()) +
this->placeHolder(i.key());
exp.appendParam(i.key(), i.value());
}
condition += ")";
exp.setExpression(condition);
}
return exp;
}

Expression QueryBuilder::orOperator() const {
return this->plainOr();
}

Expression QueryBuilder::norOperator() const {
return this->plainNor();
}

QString QueryBuilder::where(const QSharedPointer<Entity> &entity,
QString conjunction,
bool ignoreID) const {
return this->where(EntityHelper::getEntityAttributes(
EntityHelper::getMetaProperties(entity.data()), entity), conjunction, ignoreID,
entity->getPrimaryKey());
}
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