#ifndef CONNECTIONLISTMODEL_H
#define CONNECTIONLISTMODEL_H

#include <vector>
#include <memory>

#include <QAbstractListModel>

#include "ConnectionConfig.h"
#include "Expected.h"
#include <optional>
#include <variant>
#include <QVector>

#include <QSqlError>
class QSqlDatabase;

class ConnectionTreeModel : public QAbstractItemModel {
	Q_OBJECT
public:
	enum Columns {
		Name,
		Host,
		Port,
		User,
		DbName,

		ColCount
	};

	ConnectionTreeModel(QObject *parent, QSqlDatabase &db);

	void load();

	QVariant data(const QModelIndex &index, int role) const override;

//	Qt::ItemFlags flags(const QModelIndex &index) const override;

	QVariant headerData(int section, Qt::Orientation orientation,
		int role = Qt::DisplayRole) const override;

	QModelIndex index(int row, int column,
		const QModelIndex &parent = QModelIndex()) const override;

	QModelIndex parent(const QModelIndex &index) const override;

	int rowCount(const QModelIndex &parent = QModelIndex()) const override;

	int columnCount(const QModelIndex &parent = QModelIndex()) const override;

	bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex()) override;

	/** Matches cc to the list by looking at its uuid.
	 *
	 * If it is not in the list it is added. If the uuid is in the list that entry is updated.
	 * If the group has been changed it is moved to the right group.
	 * In both cases the data is also directly written to long term storage.
	 */
	void save(const QString &group, const ConnectionConfig &cc);
	/** Save changed config, group is not allowed to change
	 */
	void save(const ConnectionConfig &cc);
	/// Create a new group in the DB and place in the tree
	std::variant<int, QSqlError> addGroup(QString group_name);
	std::optional<QSqlError> removeGroup(int row);
	int findGroup(int conngroup_id) const;
private:
	using Groups = QVector<std::shared_ptr<ConnectionGroup>>;

	QSqlDatabase &m_db;
	Groups m_groups;

	/// Finds the connection with the specified uuid and returns
	/// { group_index, connection_index }
	std::tuple<int, int> findConfig(const QUuid uuid) const;
	int findGroup(QString name) const;

	std::optional<QSqlError> saveToDb(const ConnectionConfig &cc);
};

#if false
/** \brief Model class for the list of connections.
 *
 * This class also allows for the editing of the list.
 */
class ConnectionListModel : public QAbstractListModel {
	Q_OBJECT
public:
	enum Columns {
		Description,
		Name,
		Host,
		Port,
		User,
		Password,
		DbName,

		ColCount
	};

	ConnectionListModel(QObject *parent);
	ConnectionListModel(const ConnectionListModel&) = delete;
	~ConnectionListModel() override;

	// BEGIN Model/View related functions
	virtual int rowCount(const QModelIndex &parent = QModelIndex()) const override;
	virtual int columnCount(const QModelIndex &/*parent*/) const override;
	virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
	// virtual QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
	virtual bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
	virtual Qt::ItemFlags flags(const QModelIndex &index) const override;
	virtual bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex()) override;
	// END Model/View related functions

	Expected<ConnectionConfig> get(int row);

	void load();
	// Writes all entries to storage
	void save();
	// Writes the specified entry to storage
	void save(int index);
	/** Matches cc to the list by looking at its uuid.
	 *
	 * If it is not in the list it is added. If the uuid is in the list that entry is updated.
	 * In both cases the data is also directly written to long term storage.
	 */
	void save(const ConnectionConfig &cc);
	static QString makeLongDescription(const ConnectionConfig &cfg);
private:

	using ConnectionList = QVector<ConnectionConfig>;
	ConnectionList m_connections;

	QString iniFileName();
};
#endif

#endif // CONNECTIONLISTMODEL_H