#include "ConnectionListModel.h"
#include "ScopeGuard.h"
#include "util.h"

#include <botan/cryptobox.h>
#include <QDir>
#include <QStandardPaths>
#include <QSettings>


namespace {

	/** 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",     static_cast<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()));
		settings.setValue("passwordState", static_cast<int>(cc.passwordState()));
	}

	template <typename S, typename T>
	bool in_range(T value)
	{
		return value >= std::numeric_limits<S>::min() && value <= std::numeric_limits<S>::max();
	}

	void LoadConnectionConfig(QSettings &settings, ConnectionConfig &cc)
	{
		cc.setName(qvarToStdStr(settings.value("name")));
		cc.setHost(qvarToStdStr(settings.value("host")));
		cc.setHostAddr(qvarToStdStr(settings.value("hostaddr")));
		int p = settings.value("port", 5432).toInt();
		if (!in_range<uint16_t>(p)) {
			p = 0; // let the user re-enter a valid value
		}

		cc.setPort(static_cast<uint16_t>(p));
		cc.setUser(qvarToStdStr(settings.value("user")));

		//cc.setPassword(qvarToStdStr(settings.value("password")));

		cc.setDbname(qvarToStdStr(settings.value("dbname")));
		cc.setSslMode(static_cast<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")));

		PasswordState pwstate;
		QVariant v = settings.value("passwordState");
		if (v.isNull()) pwstate = PasswordState::NotStored;
		else pwstate = static_cast<PasswordState>(v.toInt());
		cc.setPasswordState(pwstate);
	}



} // end of unnamed namespace


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

ConnectionListModel::~ConnectionListModel() = default;

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 ColCount;
}

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);
		switch (col) {
		case Description:
			result = makeLongDescription(cfg);
			break;
		case Name:
			result = stdStrToQ(cfg.name());
			break;
		case Host:
			result = stdStrToQ(cfg.host());
			break;
		case Port:
			result = cfg.port();
			break;
		case User:
			result = stdStrToQ(cfg.user());
			break;
		case Password:
			result = stdStrToQ(cfg.password());
			break;
		case DbName:
			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();
//		auto& elem = m_connections.at(row);
//		elem.m_dirty = true;
//		ConnectionConfig& cfg = elem.m_config;
		ConnectionConfig& cfg = m_connections[row];
		if (col > 0) {
			result = true;
		}
		switch (col) {
		case Description:
			break;
		case Name:
			cfg.setName( qStrToStd(value.toString()) );
			break;
		case Host:
			cfg.setHost( qStrToStd(value.toString()) );
			break;
		case Port:
			cfg.setPort( value.toInt() );
			break;
		case User:
			cfg.setUser( qStrToStd(value.toString()) );
			break;
		case Password:
			cfg.setPassword( qStrToStd(value.toString()) );
			break;
		case DbName:
			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::ItemIsEnabled;
		if (index.column() != Description)
			result |= Qt::ItemIsEditable;
	}
	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);
}

bool ConnectionListModel::removeRows(int row, int count, const QModelIndex &parent)
{
	bool result = false;

	if (row >= 0 && row < m_connections.size()) {

		beginRemoveRows(parent, row, row + count -1);
		SCOPE_EXIT { endRemoveRows(); };

		QString file_name = iniFileName();
		QSettings settings(file_name, QSettings::IniFormat);
		for (int idx = 0; idx < count; ++idx) {
			auto&& cc = m_connections[idx+row];
			settings.remove(cc.uuid().toString());
		}
		settings.sync();
		m_connections.remove(row, count);
		result = true;
	}
	return result;
}

//void ConnectionListModel::newItem()
//{
////	int i = m_connections->createNew();
////	auto idx = createIndex(i, 0);
////	emit dataChanged(idx, idx);
//}

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

void ConnectionListModel::load()
{
	QString file_name = iniFileName();
	QSettings settings(file_name, QSettings::IniFormat);
	auto groups = settings.childGroups();
	for (auto&& grp : groups) {
		if (grp == "c_IniGroupSecurity") {
			// Read security settings

		} else {
			QUuid uuid(grp);
			if ( ! uuid.isNull() ) {
				settings.beginGroup(grp);
				SCOPE_EXIT { settings.endGroup(); };

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

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

		SaveConnectionConfig(settings, e);
		e.clean();
	}
	settings.sync();
}

void ConnectionListModel::save(int index)
{
	auto& e = m_connections[index];
	if (e.dirty()) {
		QString file_name = iniFileName();
		QSettings settings(file_name, QSettings::IniFormat);
		settings.beginGroup(e.uuid().toString());
		SaveConnectionConfig(settings, e);
		e.clean();
		settings.sync();
	}
}

void ConnectionListModel::save(const ConnectionConfig &cc)
{
	auto find_res = std::find(m_connections.begin(), m_connections.end(), cc.uuid());
	int i;
	if (find_res == m_connections.end()) {
		m_connections.push_back(cc);
		i = m_connections.size() - 1;
	}
	else {
		*find_res = cc;
		i = find_res - m_connections.begin();
	}
	emit dataChanged(createIndex(i, 0), createIndex(i, ColCount-1));
	save(i);
}

QString ConnectionListModel::iniFileName()
{
	QString path = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
	QDir dir(path);
	if (!dir.exists()) {
		dir.mkpath(".");
	}
	path += "/connections.ini";
	return path;
}