#include "ConnectionController.h"
#include "MasterController.h"
#include "ConnectionManagerWindow.h"
#include "ConnectionListModel.h"
#include "PasswordManager.h"
#include "DatabaseWindow.h"
#include "ServerWindow.h"
#include "BackupDialog.h"
#include "PasswordPromptDialog.h"
#include "ConnectionConfigurationWidget.h"
#include <QInputDialog>
#include <QMessageBox>
#include <QTimer>

ConnectionController::ConnectionController(MasterController *parent)
	: QObject(parent)
	, m_masterController(parent)
	, m_relockTimer(new QTimer(this))
{
	m_relockTimer->setSingleShot(true);
	m_relockTimer->setTimerType(Qt::VeryCoarseTimer);
	// Force signal to go through queue so when the password manager is relocked after 0msec
	// the code that retrieves the password is garanteed to run before the signal is handled
	// because only after the password is retrieved the loop has a chance to run.
	m_relockTimer->callOnTimeout(this, &ConnectionController::relock, Qt::QueuedConnection);
}

ConnectionController::~ConnectionController()
{
	delete m_connectionManagerWindow;
	delete m_connectionTreeModel;
}

void ConnectionController::init()
{
	m_passwordManager = std::make_shared<PasswordManager>();

	m_connectionTreeModel = new ConnectionTreeModel(this, m_masterController->userConfigDatabase());
	m_connectionTreeModel->load();

	m_connectionManagerWindow = new ConnectionManagerWindow(m_masterController, nullptr);
	m_connectionManagerWindow->show();
}

void ConnectionController::showConnectionManager()
{
	m_connectionManagerWindow->show();
}

void ConnectionController::openSqlWindowForConnection(QModelIndex index)
{
	auto config = ConnectionTreeModel::getConfigFromModelIndex(index);
	if (config) {

		if (retrieveConnectionPassword(*config)) {
			m_connectionTreeModel->save(*config);
			// TODO instead of directly openening the mainwindow
			// do async connect and only open window when we have
			// working connection
			auto w = new DatabaseWindow(m_masterController, nullptr);
			w->setAttribute( Qt::WA_DeleteOnClose );
			w->setConfig(*config);
			w->showMaximized();
		}
	}

}

void ConnectionController::openBackupDlgForConnection(QModelIndex index)
{
	auto config = ConnectionTreeModel::getConfigFromModelIndex(index);
	if (config) {
		if (retrieveConnectionPassword(*config)) {
			m_connectionTreeModel->save(*config);
			auto w = new BackupDialog(nullptr); //new ServerWindow(this, nullptr);
			w->setAttribute( Qt::WA_DeleteOnClose );
			w->setConfig(*config);
			w->show();
		}
	}
}

void ConnectionController::createConnection()
{
	ConnectionConfig cc;
	cc.setUuid(QUuid::createUuid());
	ConnectionConfigurationWidget::editExistingInWindow(this, cc);
}

void ConnectionController::editConnection(QModelIndex index)
{
	auto config = ConnectionTreeModel::getConfigFromModelIndex(index);
	if (config) {
		ConnectionConfigurationWidget::editExistingInWindow(this, *config);
	}
}

void ConnectionController::addGroup()
{
	auto result = QInputDialog::getText(nullptr, tr("Add new connection group"),
						  tr("Group name"));
	if (!result.isEmpty()) {
		auto res = m_connectionTreeModel->addGroup(result);
		if (std::holds_alternative<QSqlError>(res)) {
			QMessageBox::critical(nullptr, tr("Add group failed"),
								  tr("Failed to add group.\n") +
								  std::get<QSqlError>(res).text());
		}
	}
}

void ConnectionController::removeGroup(QModelIndex index)
{
	auto group = ConnectionTreeModel::getGroupFromModelIndex(index);
	if (group) {
		auto btn = QMessageBox::question(nullptr, tr("Connection group"),
				tr("Remove the selected group and all connections contained in the group?"),
					QMessageBox::StandardButtons(QMessageBox::Yes | QMessageBox::No),
							QMessageBox::NoButton);
		if (btn == QMessageBox::Yes) {
			m_connectionTreeModel->removeGroup(index.row());
		}
	}
}

std::shared_ptr<PasswordManager> ConnectionController::passwordManager()
{
	return m_passwordManager;
}

void ConnectionController::openServerWindowForConnection(QModelIndex index)
{
	auto config = ConnectionTreeModel::getConfigFromModelIndex(index);
	if (config) {
		if (retrieveConnectionPassword(*config)) {
			m_connectionTreeModel->save(*config);
			auto w = new ServerWindow(m_masterController, nullptr);
			w->setAttribute( Qt::WA_DeleteOnClose );
			w->setConfig(*config);
			w->show();
		}
	}
}

bool ConnectionController::retrieveConnectionPassword(ConnectionConfig &cc)
{
	auto enc_pwd = cc.encodedPassword();
	if (!enc_pwd.isEmpty()) {
		std::string pw;
		bool result = decodePassword(getPskId(cc),
					std::string_view(enc_pwd.data(), enc_pwd.size()) , pw);// getPasswordFromPskdb(getPskId(cc), pw);
		if (result) {
			cc.setPassword(QString::fromUtf8(pw.data(), pw.size()));
			return true;
		}
	}
	// Geen else hier want als voorgaande blok niet geretourneerd heeft moeten we wachtwoord
	// ook aan de gebruiker vragen zoals hier gebeurd.
	QString str = cc.makeLongDescription();
	auto dlg = std::make_unique<PasswordPromptDialog>(PasswordPromptDialog::SaveOption, nullptr);
	dlg->setCaption(tr("Connection password prompt"));
	dlg->setDescription(QString(tr("Please provide password for connection %1")).arg(str));
	int exec_result = dlg->exec();

	if (exec_result == QDialog::Accepted) {
		auto password = dlg->password();
		cc.setPassword(password);
		if (dlg->saveChecked()) {
			auto ba = password.toUtf8();
			std::string pw(ba.data(), static_cast<size_t>(ba.size()));
			std::string encoded_pw;
			if (encodePassword(getPskId(cc), pw, encoded_pw)) {
				cc.setEncodedPassword({ encoded_pw.data(), static_cast<int>(encoded_pw.size()) });
			}
		}
		return true;
	}
	return false;
}

bool ConnectionController::decodePassword(const std::string &password_id, const std::string_view &enc_password, std::string &password)
{
	if (!UnlockPasswordManagerIfNeeded())
		return false;

	password = m_passwordManager->decrypt(password_id, enc_password);
	return true;
}

bool ConnectionController::encodePassword(const std::string &password_id, const std::string &password, std::string &enc_password)
{
	if (!UnlockPasswordManagerIfNeeded())
		return false;

	enc_password = m_passwordManager->encrypt(password_id, password);
	return true;
}

bool ConnectionController::UnlockPasswordManagerIfNeeded()
{
	auto&& user_cfg_db = m_masterController->userConfigDatabase();
	if (m_passwordManager->initialized(user_cfg_db)) {
		if (!m_passwordManager->locked())
			return true;

		while (true) {
			//   ask user for passphrase
			auto dlg = std::make_unique<PasswordPromptDialog>(PasswordPromptDialog::RememberPassword, nullptr);
			dlg->setCaption(tr("Unlock password manager"));
			dlg->setDescription(tr("Enter password for password manager"));
			int exec_result = dlg->exec();
			bool ok = (exec_result == QDialog::Accepted);

			if (!ok) {
				// leave this retry loop
				break;
			}
			// user gave OK, if succeeds return true otherwise loop a prompt for password again.
			if (m_passwordManager->openDatabase(user_cfg_db, dlg->password())) {
				int rem = dlg->remember();
				if (rem >= 0) {
					int timeout = rem * 60 * 1000; /// rem is in minutes, timeout in millisec
					m_relockTimer->start(timeout);
				}
				return true;
			}
		}
	}
	else {
		// Ask user for passphrase + confirmation, clearly instruct this is first setup
		// create
		auto dlg = std::make_unique<PasswordPromptDialog>(PasswordPromptDialog::ConfirmPassword, nullptr);
		dlg->setCaption(tr("Password manager setup"));
		dlg->setDescription(tr("Enter a strong password for password manager initialization. A strong key will be "
							   "derived from your password and it will be impossible to recover anything from the "
							   "password manager without the password you enter here."));
		int exec_result = dlg->exec();
		if (exec_result == QDialog::Accepted) {
			QString passphrase = dlg->password();
			if (m_passwordManager->createDatabase(user_cfg_db, passphrase))
				return true;
		}
	}
	return false;
}

std::string ConnectionController::getPskId(const ConnectionConfig &cc)
{
	std::string id = "dbpw/";
	id += cc.uuid().toString().toUtf8().data();
	return id;
}

void ConnectionController::relock()
{
	m_passwordManager->closeDatabase();
}