#include "connectionlistmodel.h"
#include <QDir>
#include <QStandardPaths>
#include <QSettings>
#include "scopeguard.h"

inline QString stdStrToQ(const std::string &s)
{
	return QString::fromUtf8(s.c_str());
}

inline std::string qStrToStd(const QString &s)
{
	return std::string(s.toUtf8().data());
}

inline std::string qvarToStdStr(const QVariant &c)
{
	return qStrToStd(c.toString());
}


/** Saves a connection configuration.

Before calling this you may want to call beginGroup.
*/
void SaveConnectionConfig(QSettings &settings, const ConnectionConfig &cc)
{
	settings.setValue("name", stdStrToQ(cc.name()));
	settings.setValue("host",        stdStrToQ(cc.host()));
	settings.setValue("hostaddr",    stdStrToQ(cc.hostAddr()));
	settings.setValue("port",        cc.port());
	settings.setValue("user",        stdStrToQ(cc.user()));
	settings.setValue("password",    stdStrToQ(cc.password()));
	settings.setValue("dbname",      stdStrToQ(cc.dbname()));
	settings.setValue("sslmode",     (int)cc.sslMode());
	settings.setValue("sslcert",     stdStrToQ(cc.sslCert()));
	settings.setValue("sslkey",      stdStrToQ(cc.sslKey()));
	settings.setValue("sslrootcert", stdStrToQ(cc.sslRootCert()));
	settings.setValue("sslcrl",      stdStrToQ(cc.sslCrl()));
}

void LoadConnectionConfig(QSettings &settings, ConnectionConfig &cc)
{
	cc.setName(qvarToStdStr(settings.value("name")));
	cc.setHost(qvarToStdStr(settings.value("host")));
	cc.setHostAddr(qvarToStdStr(settings.value("hostaddr")));
	cc.setPort(settings.value("port", 5432).toInt());
	cc.setUser(qvarToStdStr(settings.value("user")));
	cc.setPassword(qvarToStdStr(settings.value("password")));
	cc.setDbname(qvarToStdStr(settings.value("dbname")));
	cc.setSslMode((SslMode)settings.value("sslmode").toInt());
	cc.setSslCert(qvarToStdStr(settings.value("sslcert")));
	cc.setSslKey(qvarToStdStr(settings.value("sslkey")));
	cc.setSslRootCert(qvarToStdStr(settings.value("sslrootcert")));
	cc.setSslCrl(qvarToStdStr(settings.value("sslcrl")));
}



ConnectionListModel::ConnectionListModel(QObject *parent)
	: QAbstractListModel(parent)
{
	load();
}

int ConnectionListModel::rowCount(const QModelIndex &parent) const
{
	int result = 0;
	if (parent == QModelIndex()) {
		result = m_connections.size();
	}
	return result;
}

int ConnectionListModel::columnCount(const QModelIndex &/*parent*/) const
{
	return 7;
}

QVariant ConnectionListModel::data(const QModelIndex &index, int role) const
{
	QVariant result;
	if (role == Qt::DisplayRole || role == Qt::EditRole) {
		int row = index.row();
		int col = index.column();
		const ConnectionConfig& cfg = m_connections.at(row).m_config;
		switch (col) {
		case 0:
			result = makeLongDescription(cfg);
			break;
		case 1:
			result = stdStrToQ(cfg.name());
			break;
		case 2:
			result = stdStrToQ(cfg.host());
			break;
		case 3:
			result = cfg.port();
			break;
		case 4:
			result = stdStrToQ(cfg.user());
			break;
		case 5:
			result = stdStrToQ(cfg.password());
			break;
		case 6:
			result = stdStrToQ(cfg.dbname());
			break;
		}
	}

	return result;
}

bool ConnectionListModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
	bool result = false;
	if (role == Qt::EditRole) {
		int row = index.row();
		int col = index.column();
		ConnectionConfig& cfg = m_connections.at(row).m_config;
		if (col > 0) {
			result = true;
		}
		switch (col) {
		case 0:
			break;
		case 1:
			cfg.setName( qStrToStd(value.toString()) );
			break;
		case 2:
			cfg.setHost( qStrToStd(value.toString()) );
			break;
		case 3:
			cfg.setPort( value.toInt() );
			break;
		case 4:
			cfg.setUser( qStrToStd(value.toString()) );
			break;
		case 5:
			cfg.setPassword( qStrToStd(value.toString()) );
			break;
		case 6:
			cfg.setDbname( qStrToStd(value.toString()) );
			break;
		}
	}
	if (result) {
		emit dataChanged(index, index);
	}
	return result;
}

Qt::ItemFlags ConnectionListModel::flags(const QModelIndex &index) const
{
	Qt::ItemFlags result;
	int row = index.row();
	if (row >= 0 && row < m_connections.size()) {
		result = Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled;
	}
	return result;
}


QString ConnectionListModel::makeLongDescription(const ConnectionConfig &cfg)
{
	std::string result(cfg.name());
	result += " (";
	result += cfg.user();
	result += "@";
	result += cfg.host();
	result += ":";
	result += std::to_string(cfg.port());
	result += "/";
	result += cfg.dbname();
	result += ")";
	return stdStrToQ(result);
}

void ConnectionListModel::add(const ConnectionConfig &cfg)
{
	m_connections.emplace_back(QUuid::createUuid(), cfg);
	auto idx = createIndex(m_connections.size()-1, 0);
	emit dataChanged(idx, idx);
}

Expected<ConnectionConfig> ConnectionListModel::get(int row)
{
	if (row >= 0 && row < m_connections.size()) {
		return m_connections.at(row).m_config;
	}
	else {
		return Expected<ConnectionConfig>::fromException(std::out_of_range("Invalid row"));
	}
}

//void ConnectionListModel::del(const int idx)
bool ConnectionListModel::removeRows(int row, int count, const QModelIndex &parent)
{
	bool result = false;
	if (row >= 0 && row < m_connections.size()) {
		auto f = m_connections.begin() + row;
		m_connections.erase(f, f + count);
		result = true;
	}
	return result;
}

/// \todo should return an expected as creation of the folder can fail
QString ConnectionListModel::iniFileName()
{
	QString path = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
	QDir dir(path);
	if (!dir.exists()) {
		dir.mkpath(".");
	}
	path += "/connections.ini";
	return path;
}


void ConnectionListModel::load()
{
	QString file_name = iniFileName();
	QSettings settings(file_name, QSettings::IniFormat);
	auto groups = settings.childGroups();
	for (auto grp : groups) {
		QUuid uuid(grp);
		if ( ! uuid.isNull() ) {
			settings.beginGroup(grp);
			SCOPE_EXIT { settings.endGroup(); };

			ConnectionConfig cc;
			LoadConnectionConfig(settings, cc);
			m_connections.emplace_back(uuid, cc);
		}
	}
}

void ConnectionListModel::save()
{
	QString file_name = iniFileName();
	QSettings settings(file_name, QSettings::IniFormat);
	for (auto e : m_connections) {
		settings.beginGroup(e.m_uuid.toString());
		SCOPE_EXIT { settings.endGroup(); };

		SaveConnectionConfig(settings, e.m_config);
	}
}