/*
* Copyright (c) 2012-2015 Christian Surlykke
*
* This file is part of qt-lightdm-greeter 
* It is distributed under the LGPL 2.1 or later license.
* Please refer to the LICENSE file for a copy of the license.
*/
#include <QDebug>
#include <QCompleter>
#include <QAbstractListModel>
#include <QModelIndex>
#include <QFile>
#include <QTextStream>
#include <QStringList>
#include <QPixmap>
#include <QMessageBox>
#include <QMenu>
#include <QProcess>
#include <QLightDM/UsersModel>
#include <QMetaMethod>

#include "loginform.h"
#include "ui_loginform.h"
#include "settings.h"

int rows(QAbstractItemModel& model) {
    return model.rowCount(QModelIndex());
}

LoginForm::LoginForm(QWidget *parent) :
    QWidget(parent), 
    ui(new Ui::LoginForm),
    m_Greeter(),
    power(this),
    sessionsModel(),
    clearMsg(false)
{
    if (!m_Greeter.connectSync()) {
        exit(0);
        return;
    }

    ui->setupUi(this);
    initialize();
}

LoginForm::~LoginForm()
{
    delete ui;
}

void LoginForm::setFocus(Qt::FocusReason reason)
{
    if (ui->userInput->text().isEmpty()) {
        ui->userInput->setFocus(reason);
    } else {
        ui->passwordInput->setFocus(reason);
    }
}


void LoginForm::initialize()
{
    QPixmap icon(":/resources/rqt-2.png"); // This project came from Razor-qt
    ui->iconLabel->setPixmap(icon.scaled(ui->iconLabel->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
    ui->hostnameLabel->setText(m_Greeter.hostname());

    addLeaveEntry(power.canShutdown(), "system-shutdown", tr("Shutdown"), "shutdown");
    addLeaveEntry(power.canRestart(), "system-reboot", tr("Restart"), "restart");
    //addLeaveEntry(power.canHibernate(), "system-suspend-hibernate", tr("Hibernate"), "hibernate");
    //addLeaveEntry(power.canSuspend(), "system-suspend", tr("Suspend"), "suspend");
    ui->leaveComboBox->setDisabled(ui->leaveComboBox->count() <= 1);

    cancelLoginTimer.setInterval(10000);
    cancelLoginTimer.setSingleShot(true);
    connect(&cancelLoginTimer, SIGNAL(timeout()), this, SLOT(cancelLogin()));

    //connect(ui->userInput, SIGNAL(editingFinished()), this, SLOT(userChanged()));
    connect(ui->leaveComboBox, SIGNAL(activated(int)), this, SLOT(leaveDropDownActivated(int)));
    connect(&m_Greeter, SIGNAL(showPrompt(QString, QLightDM::Greeter::PromptType)), this, SLOT(onPrompt(QString, QLightDM::Greeter::PromptType)));
    connect(&m_Greeter, SIGNAL(showMessage(QString, QLightDM::Greeter::MessageType)), this, SLOT(onMessage(QString, QLightDM::Greeter::MessageType)));
    connect(&m_Greeter, SIGNAL(authenticationComplete()), this, SLOT(onAuthenticationComplete()));

    ui->passwordInput->clear();
}

void LoginForm::startAuthentication()
{
	qDebug() << "Start auth";
    //setCurrentSession(Cache().getLastSession(ui->userInput->text()));

	if (m_Greeter.inAuthentication()) {
		m_Greeter.cancelAuthentication();
	}
    if (ui->userInput->text().isEmpty()) {
    	ui->userInput->setFocus();
    	return;
    }
    if (ui->passwordInput->text().isEmpty()) {
    	ui->passwordInput->setFocus();
    	return;
    }

    ui->messageLabel->setText(tr("Logging in..."));
    clearMsg = false;
    ui->userInput->setEnabled(false);
    ui->passwordInput->setEnabled(false);
    cancelLoginTimer.start();
    m_Greeter.authenticate(ui->userInput->text());
}

void LoginForm::onPrompt(QString prompt, QLightDM::Greeter::PromptType promptType)
{
	qDebug() << "Prompt: " << prompt;
	m_Greeter.respond(ui->passwordInput->text());
	ui->passwordInput->clear();
}

void LoginForm::leaveDropDownActivated(int index)
{
    QString actionName = ui->leaveComboBox->itemData(index).toString();
    if      (actionName == "shutdown") power.shutdown();
    else if (actionName == "restart") power.restart();
    else if (actionName == "hibernate") power.hibernate();
    else if (actionName == "suspend") power.suspend();
}

void LoginForm::onMessage(QString message, QLightDM::Greeter::MessageType type)
{
	qDebug() << "Message: " << message;
	ui->messageLabel->setText(message);
	clearMsg = true;
}

void LoginForm::addLeaveEntry(bool canDo, QString iconName, QString text, QString actionName)
{
    if (canDo) {
        ui->leaveComboBox->addItem(QIcon::fromTheme(iconName), text, actionName);
    }
}

void LoginForm::onAuthenticationComplete()
{
    if (m_Greeter.isAuthenticated()) {
    	qDebug() << "Auth complete, start session";
    	ui->messageLabel->setText(tr("Starting session..."));
    	QModelIndex i = sessionsModel.index(0, 0);
        if (m_Greeter.startSessionSync(sessionsModel.data(i, QLightDM::SessionsModel::KeyRole).toString())) {
        	cancelLoginTimer.stop();
        } else {
        	ui->messageLabel->setText(tr("Cannot open session"));
        	clearMsg = true;
        }
    } else {
    	qDebug() << "Auth failed, cancelling...";
    	cancelLogin();
    }
}

void LoginForm::cancelLogin()
{
	qDebug() << "Cancel login";
	if (m_Greeter.inAuthentication()) {
		qDebug() << "Was in authentication";
		m_Greeter.cancelAuthentication();
	}
	cancelLoginTimer.stop();
	ui->passwordInput->clear();
	ui->userInput->setEnabled(true);
	ui->passwordInput->setEnabled(true);
	if (!clearMsg) {
		ui->messageLabel->setText(tr("Login failed"));
	}
	ui->userInput->setFocus();
	ui->userInput->selectAll();
	clearMsg = true;
}

void LoginForm::keyPressEvent(QKeyEvent *event)
{
	if (clearMsg) {
		clearMsg = false;
		ui->messageLabel->clear();
	}
    if (event->key() == Qt::Key_Return || event->key() == Qt::Key_Enter) {
    	if (!ui->userInput->isEnabled()) {
    		// Ignore if auth in progress
    		return;
    	}
        if (ui->userInput->hasFocus()) {
        	ui->passwordInput->setFocus();
        	return;
        }
        if (ui->passwordInput->hasFocus()) {
        	startAuthentication();
        	return;
        }
    }
    // Fallback: Passthrough
    QWidget::keyPressEvent(event);
}