#include "ConnectionList.h"
#include "ScopeGuard.h"
#include "util.h"
#include "PasswordManager.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

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


ConnectionList::ConnectionList()
{
}

size_t ConnectionList::createNew()
{
	ConnectionConfig cc;
	cc.setUuid(QUuid::createUuid());
	m_connections.push_back(cc);
	return m_connections.size()-1;
}

void ConnectionList::remove(size_t idx, size_t count)
{
	auto f = m_connections.begin() + static_cast<int>(idx);
	auto l = f + static_cast<int>(count);
	deleteFromIni(f, l);
	m_connections.erase(f, l);
}

void ConnectionList::deleteFromIni(t_Connections::iterator begin, t_Connections::iterator end)
{
	QString file_name = iniFileName();
	QSettings settings(file_name, QSettings::IniFormat);
	for (auto i = begin; i != end; ++i) {
		settings.remove(i->uuid().toString());
	}
}

void ConnectionList::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 ConnectionList::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 ConnectionList::save(size_t index)
{
	auto& e = m_connections.at(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();
	}
}