#include "MasterController.h"
#include "ConnectionManagerWindow.h"
#include "ConnectionList.h"
#include "ConnectionListModel.h"
#include "PasswordManager.h"
#include "DatabaseWindow.h"
#include "ServerWindow.h"
#include "BackupDialog.h"
#include "PasswordPromptDialog.h"
#include <QDebug>
#include <QDir>
#include <QStandardPaths>
#include <botan/sqlite3.h>

namespace {

	QString GetUserConfigDatabaseName()
	{
		QString path = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
		QDir dir(path);
		if (!dir.exists()) {
			dir.mkpath(".");
		}
		path += "/pglabuser.db";
		return path;
	}

}

MasterController::MasterController(QObject *parent) : QObject(parent)
{}

MasterController::~MasterController()
{
	delete m_connectionManagerWindow;
	delete m_connectionListModel;
	delete m_connectionList;
}

void MasterController::init()
{
	//std::string dbfilename = QDir::toNativeSeparators(GetUserConfigDatabaseName()).toUtf8().data();
	//m_userConfigDatabase = std::make_shared<Botan::Sqlite3_Database>(dbfilename);

	m_userConfigDatabase = QSqlDatabase::addDatabase("QSQLITE");
	m_userConfigDatabase.setDatabaseName(GetUserConfigDatabaseName());

	if (!m_userConfigDatabase.open()) {
		qDebug() << "Error: connection with database fail";
	}
	else {
		qDebug() << "Database: connection ok";
	}

	m_passwordManager = std::make_shared<PasswordManager>();

	m_connectionList = new ConnectionList;
	m_connectionList->load();
	m_connectionListModel = new ConnectionListModel(m_connectionList, this);

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

}

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

void MasterController::openSqlWindowForConnection(size_t connection_index)
{

	auto res = m_connectionListModel->get(connection_index);
	if (res.valid()) {
		auto cc = res.get();

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

}

void MasterController::openBackupDlgForConnection(size_t connection_index)
{
	auto res = m_connectionListModel->get(connection_index);
	if (res.valid()) {
		auto cc = res.get();
		if (retrieveConnectionPassword(cc)) {
			m_connectionListModel->save(connection_index, cc);
			auto w = new BackupDialog(nullptr); //new ServerWindow(this, nullptr);
			w->setAttribute( Qt::WA_DeleteOnClose );
			w->setConfig(cc);
			w->show();
		}
	}
}

void MasterController::openServerWindowForConnection(size_t connection_index)
{
	auto res = m_connectionListModel->get(connection_index);
	if (res.valid()) {
		auto cc = res.get();
		if (retrieveConnectionPassword(cc)) {
			m_connectionListModel->save(connection_index, cc);
			auto w = new ServerWindow(this, nullptr);
			w->setAttribute( Qt::WA_DeleteOnClose );
			w->setConfig(cc);
			w->show();
		}
	}
}


bool MasterController::retrieveConnectionPassword(ConnectionConfig &cc)
{
	auto pw_state = cc.passwordState();
	if (pw_state == PasswordState::NotNeeded) {
		return true;
	}
	else if (pw_state == PasswordState::SavedPasswordManager) {
		std::string pw;
		bool result = getPasswordFromPskdb(getPskId(cc), pw);
		if (result) {
			cc.setPassword(pw);
			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 = ConnectionListModel::makeLongDescription(cc);
	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) {
		std::string password = dlg->password().toUtf8().data();
		cc.setPassword(password);
		if (dlg->saveChecked()) {
			storePasswordInPskdb(getPskId(cc), password);
			cc.setPasswordState(PasswordState::SavedPasswordManager);
		}
		return true;
	}
	return false;
}


bool MasterController::getPasswordFromPskdb(const std::string &password_id, std::string &password)
{
	if (!UnlockPasswordManagerIfNeeded())
		return false;

	return m_passwordManager->get(password_id, password);
}


bool MasterController::storePasswordInPskdb(const std::string &password_id, const std::string password)
{
	if (!UnlockPasswordManagerIfNeeded())
		return false;

	m_passwordManager->set(password_id, password);
	return true;
}

bool MasterController::UnlockPasswordManagerIfNeeded()
{
	if (m_passwordManager->initialized(m_userConfigDatabase)) {
		if (!m_passwordManager->locked())
			return true;

		while (true) {
			//   ask user for passphrase
			auto dlg = std::make_unique<PasswordPromptDialog>(nullptr, 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(m_userConfigDatabase, dlg->password()))
				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(m_userConfigDatabase, passphrase))
				return true;
		}
	}
	return false;
}

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

//std::shared_ptr<Botan::Sqlite3_Database> MasterController::getUserConfigDatabase()
//{
//	return m_userConfigDatabase;
//}