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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/>.
*/
#ifndef QUERYBUILDER_H
#define QUERYBUILDER_H
#include <QString>
#include <QHash>
#include <QSharedPointer>
#include <QPointer>
#include <QSqlQuery>
#include <QStringList>
#include <QMetaProperty>
#include "relation.h"
#include "expression.h"
#include "query.h"
namespace CuteEntityManager {
class Schema;
class Entity;
class Database;
class Logger;
enum DbForeignKeyCascade {
RESTRICT,
CASCADE,
NO_ACTION,
SET_DEFAULT,
SET_NULL,
};

class QueryBuilder {
/**
* EntityManager is a friend class, cause we want a light public api.
*/
friend class EntityManager;
friend class QueryInterpreter;
public:
QueryBuilder(QSharedPointer<Schema> schema, QSharedPointer<Database> database);
virtual ~QueryBuilder();
virtual bool createTable(const QSharedPointer<Entity> &entity,
bool createRelationTables = true) const;
virtual bool createIndices(const QSharedPointer<Entity> &entity) const;
virtual QString createTable(const QString &tableName,
const QHash<QString, QString> &tableDefinition) const;
virtual bool createRelationTables(const QSharedPointer<Entity> &entity) const;
virtual QString createTableQuery(const QString &tableName,
const QHash<QString, QString> &tableDefinition) const;
virtual QString renameTable(QString tableName, QString newName) const;
virtual QString dropTable(QString tableName) const;
virtual QString truncateTable(QString tableName) const;
virtual QString addColumn(QString tableName, QString columnName,
QString columnType) const;
virtual QString dropColumn(QString tableName, QString columName)const;
virtual QString renameColumn(QString tableName, QString oldName,
QString newName) const;
virtual QString alterColumn(QString tableName, QString columnName,
QString newType)const;
virtual QString addPrimaryKey(QString name, QString tableName,
QStringList columns)const;
virtual QString dropPrimaryKey(QString name, QString tableName) const;
virtual QString addForeignKey(QString name, QString tableName,
QStringList columns,
QString refTableName,
QStringList refColumns, QString deleteConstraint,
QString updateConstraint) const;
virtual QString getForeignKeyCascade(DbForeignKeyCascade cascade) const;
virtual QString dropForeignKey(QString name, QString tableName) const;
virtual QString createIndex(QString name, QString tableName,
QStringList columns,
bool unique)const;
virtual QString dropIndex(QString name, QString tableName)const;
virtual QString createFkSuperClass(const Entity *e) const;
virtual QStringList relationFks(const QSharedPointer<Entity> &entity) const;
virtual bool supportsForeignKeys() const;

virtual QString createForeignKeyManyToMany(const QString &tableName,
const QSharedPointer<Entity> &entity, const QString &update,
const QString &remove) const;

QSharedPointer<Schema> getSchema() const;
void setSchema(const QSharedPointer<Schema> &value);

QSharedPointer<Database> getDatabase() const;
void setDatabase(const QSharedPointer<Database> &value);
QHash<QString, QHash<QString, QString>> generateRelationTables(
const QSharedPointer<Entity> &entity)
const;
QHash<QString, QString> generateTableDefinition(const QSharedPointer<Entity>
&entity)
const;
QSqlQuery getQuery() const;
QString transformTypeToAbstractDbType(QString typeName) const;
QString transformAbstractTypeToRealDbType(QString typeName) const;
QString getColumnType(const QString &type) const;
virtual QString placeHolder(const QString &key) const;
void bindValues(const QHash<QString, QVariant> &h, QSqlQuery &q,
bool ignoreID = false, const QString &primaryKey = QStringLiteral("id")) const;
void bindValue(const QString &key, const QVariant &value, QSqlQuery &q) const;
Expression where(QString column, QVariant value);
Join joinClasses(const QSharedPointer<Entity> &mainEntity,
const QSharedPointer<Entity> &foreignEntity,
const QString &joinType = QStringLiteral("LEFT JOIN"))const;
QList<Join> joinBaseClasses(const QSharedPointer<Entity> &entity);
/**
* @brief where
* @param query
* @param conditions
* @param conjunction its AND or OR
*/
Expression where(QHash<QString, QVariant> conditions,
QString conjunction = QStringLiteral("AND")) const;
Expression where(QString condition,
QHash<QString, QVariant> values = QHash<QString, QVariant>()) const;
//void where(Query &query,QHash<QString, QList<QVariant>> conditions, QString concat="AND");
Expression between(QString column, QVariant firstValue,
QVariant secondValue) const;
Expression notBetween(QString column, QVariant firstValue,
QVariant secondValue) const;
Expression in(QString column, QList<QVariant> values) const;
Expression notIn(QString column, QList<QVariant> values) const;
Expression notOperator(QString op, QString column,
QVariant value) const;
Expression orOperator(QHash<QString, QVariant> conditions,
bool like = false) const;
Expression orOperator() const;
Expression norOperator() const;
Expression andOperator(QHash<QString, QVariant> conditions) const;
Expression andOperator() const;
Expression nandOperator() const;
/**
* @brief arbitraryOperator
* @param query
* @param op can be = | != | <> | > | < | >= | <= | !< | !> @see http://www.tutorialspoint.com/sql/sql-operators.htm comparison operators
* @param column
* @param value
*/
Expression arbitraryOperator(QString op, QString column,
QVariant value) const;
Expression isNull(QString column) const;
Expression isNotNull(QString column) const;

Expression plainOr() const; //adds a simple OR to condition
Expression plainNor() const;
Expression plainAnd() const; //add a simple AND to condition
Expression plainNand() const;
/**
* Generates 'foo' LIKE "%bar%"
* @brief like
* @param column
* @param value
*/
Expression like(QString column, QVariant value,
JokerPosition jp = JokerPosition::BOTH, QChar wildcard = '%');
/**
* @brief like
* @param condition
* @param concat
*/
Expression like(QHash<QString, QVariant> conditions,
QString conjunction = QStringLiteral("AND"),
JokerPosition jp = JokerPosition::BOTH, QChar wildcard = '%');

protected:
class ClassAttributes {
public:
ClassAttributes() { }
explicit ClassAttributes(const QString name,
const QHash<QString, QVariant> attributes, QString pk = "id");
QString getName() const;
void setName(const QString &value);

QHash<QString, QVariant> getAttributes() const;
void setAttributes(const QHash<QString, QVariant> &value);

QString getPk() const;
void setPk(const QString &value);

private:
QString name;
QString pk;
QHash<QString, QVariant> attributes;
};

QStringList quoteTableNames(const QStringList &tables);
QString getSeparator() const;
void setSeparator(const QString &value);
QSqlQuery find(const qint64 &id, const QString &tableName) const;
QSqlQuery find(const qint64 &id, const QSharedPointer<Entity> &entity,
qint64 offset = 0, QString pk = "id") const;
QSqlQuery findByAttributes(const QHash<QString, QVariant> &m,
const QString &tableName,
const bool &ignoreID = true, const qint64 limit = 0,
const qint64 offset = 0) const;
QSqlQuery findByAttributes(const QSharedPointer<Entity> &e,
bool ignoreID = true,
const qint64 limit = 0, const qint64 offset = 0);
QSqlQuery findAll(const QString &tableName) const;
QSqlQuery findAll(const QSharedPointer<Entity> &entity, const qint64 limit = 0,
qint64 offset = 0);
QList<QSqlQuery> remove(const QSharedPointer<Entity> &entity) const;
QSqlQuery findId(const QSharedPointer<Entity> &entity) const;
QSqlQuery count(const QString &tableName) const;
QList<QSqlQuery> merge(const QSharedPointer<Entity> &entity) const;
QList<QSqlQuery> create(const QSharedPointer<Entity> &entity) const;
QSqlQuery removeAll(const QString &tableName) const;
QSqlQuery oneToMany(const QString &tableName, const QString &attribute,
const qint64 &id,
const qint64 &limit = 0);
QSqlQuery manyToMany(const QString &tableName, const QString &attribute,
const qint64 &id);
QSqlQuery manyToManyDelete(const QString &tableName, const QString &attribute,
const qint64 &id);
QSqlQuery manyToManyInsert(const QString &tableName, const QString &col1,
const QString &col2) const;
QSqlQuery remove(const QString &tableName, const qint64 &id,
const QString &primaryKey = "id") const;
QSqlQuery insert(const QString &tableName, QHash<QString, QVariant> &attributes,
const QString &primaryKey = "id", bool withId = false) const;
QSqlQuery update(const QString &tableName, QHash<QString, QVariant> &attributes,
const QString &primaryKey = "id") const;
QList<QSqlQuery> createOrMerge(const QSharedPointer<Entity> &entity,
bool insert) const;
virtual QString limit(const quint64 &limit, const quint64 &offset,
bool withSpace = true) const;
QString generateIndexName(const QString &name, const QString &table,
const QString &refColumn, const QString &refTable, const bool fk) const;
QString generateColumnNameID(QString name) const;
QString columnNameIDAppendix() const;
virtual void createRelationFK(QStringList &queries,
const QSharedPointer<Entity> &entity, const Relation &relation,
const QMetaProperty &metaProperty, const QString &update,
const QString &remove) const;
void insertRelationId(const Entity *e, QHash<QString, QVariant> &map,
QString relName) const;
QString buildColumns(const QStringList &columns) const;
QHash<QString, QVariant> getManyToOneAttributes(QHash<QString, QMetaProperty>
props,
const QSharedPointer<Entity> &entity,
QHash<QString, Relation> relations = QHash<QString, Relation>()) const;
QHash<QString, QMetaProperty> getMetaProperties(const QSharedPointer<Entity>
&entity)
const;
QHash<QString, QVariant> getPropertyValues(const QHash<QString, QMetaProperty>
&metaProps,
const QSharedPointer<Entity> &entity) const;
QString generateManyToManyTableName(const QSharedPointer<Entity> &firstEntity,
const QSharedPointer<Entity> &secondEntity, const Relation &r) const;
QString generateManyToManyColumnName(const QSharedPointer<Entity> &entity)
const;
QString buildCreateQuery(QHash<QString, QVariant>::const_iterator i,
QHash<QString, QVariant>::const_iterator end,
QString &p1, QString &p2) const;
QString where(const QSharedPointer<Entity> &entity, QString conjunction = ",",
bool ignoreID = false) const;
QString where(const QHash<QString, QVariant> &m,
const QString &conjunction,
bool ignoreID = false, const QString &primaryKey = "id",
bool withKeyword = true) const;
QString attributes(const QHash<QString, QVariant> &m, bool select = true,
const QString &conjunction = ",",
bool ignoreID = false, const QString &primaryKey = "id") const;
QHash<QString, QVariant> saveAttributes(const QSharedPointer<Entity> &entity,
QHash<QString, QMetaProperty> props = QHash<QString, QMetaProperty> (),
QHash<QString, Relation> relations = QHash<QString, Relation>())
const;
QHash<QString, QMetaProperty> processProperties(const QSharedPointer<Entity> &e,
QHash<QString, QMetaProperty> &usedProperties) const;
QHash<QString, Relation> processRelations(const QSharedPointer<Entity> &e,
QHash<QString, Relation> &usedRelations) const;
QList<ClassAttributes> inheritedAttributes(
const QSharedPointer<Entity> &entity) const;

QString leftJoin(const QString &foreignTable, const QString &tableName,
const QString &foreignKey = "id", const QString &primaryKey = "id",
bool onlyCondition = false) const;
QString superClassColumnName(const QMetaObject *&superMeta) const;
QString addWildcard(QVariant var, JokerPosition jp,
QChar jokerChar = '%') const;

QString joinSuperClasses(const QSharedPointer<Entity> &entity) const;
virtual QString selectBase(const QStringList &tables,
const QStringList &columns = QStringList()) const;
virtual QString countFunction(const QString &distinctColumn = "") const;
virtual QString distinct() const;
virtual QString notKeyword() const;
virtual QString between() const;
virtual QString andKeyword() const;
virtual QString orKeyword() const;
virtual QString inKeyword() const;
virtual QString whereKeyword() const;
virtual QString countKeyword() const;
virtual Expression inFunction(QString column, QList<QVariant> values,
bool notOp = false) const;
virtual QString between(QString colName, QString valName1, QString valName2,
bool notOp = false) const;
virtual QString likeKeyword() const;
virtual QString limitKeyword() const;
virtual QString offsetKeyword() const;
QString appendNot(bool notOp) const;
virtual Expression appendCondition(QString ph1, QString ph2, QVariant val1,
QVariant val2, QString condition) const;
QString entityClassname() const;
QString separator;
QSharedPointer<Schema> schema;
QSharedPointer<Database> database;
};
}

#endif // QUERYBUILDER_H
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