/*
* Copyright (c) 2012-2015 Christian Surlykke
* 2017 bwLehrpool project
*
* Based on qt-lightdm-greeter, stripped down to fit
* our specific needs.
* It is distributed under the LGPL 2.1 or later license.
* Please refer to the LICENSE file for a copy of the license.
*/
#include <QAbstractListModel>
#include <QModelIndex>
#include <QPixmap>
#include <QMessageBox>
#include <QMenu>
#include <QListView>

#include <iostream>

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

LoginForm::LoginForm(QWidget *parent) :
    QWidget(parent), 
    ui(new Ui::LoginForm),
    clearMsg(false)
{
    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/bwlp.svg"); // This project came from Razor-qt
    ui->iconLabel->setPixmap(icon.scaled(ui->iconLabel->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation));

    ui->leaveComboBox->setView(new QListView()); // This is required to get the stylesheet to apply

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

    hideMessageTimer.setInterval(10000);
    hideMessageTimer.setSingleShot(true);
    connect(&hideMessageTimer, SIGNAL(timeout()), this, SLOT(hideMessage()));

    if (!Global::testMode()) {
        ui->hostnameLabel->setText(Global::greeter()->hostname());

        addLeaveEntry(Global::power()->canShutdown(), "system-shutdown", tr("Shutdown"), "shutdown");
        addLeaveEntry(Global::power()->canRestart(), "system-reboot", tr("Restart"), "restart");

        connect(ui->leaveComboBox, SIGNAL(activated(int)), this, SLOT(leaveDropDownActivated(int)));
        connect(Global::greeter(), SIGNAL(showPrompt(QString, QLightDM::Greeter::PromptType)), this, SLOT(onPrompt(QString, QLightDM::Greeter::PromptType)));
        connect(Global::greeter(), SIGNAL(showMessage(QString, QLightDM::Greeter::MessageType)), this, SLOT(onMessage(QString, QLightDM::Greeter::MessageType)));
        connect(Global::greeter(), SIGNAL(authenticationComplete()), this, SLOT(onAuthenticationComplete()));
    }

    ui->leaveComboBox->setDisabled(ui->leaveComboBox->count() <= 1);
    ui->passwordInput->clear();
}

void LoginForm::startAuthentication()
{
    if (Global::testMode()) {
        return;
    }
    if (Global::greeter()->inAuthentication()) {
    	Global::greeter()->cancelAuthentication();
	}
    if (ui->userInput->text().isEmpty()) {
    	ui->userInput->setFocus();
    	return;
    }
    if (ui->passwordInput->text().isEmpty()) {
    	ui->passwordInput->setFocus();
    	return;
    }

    showMessage(tr("Logging in..."), false);
    clearMsg = false;
    ui->userInput->setEnabled(false);
    ui->passwordInput->setEnabled(false);
    cancelLoginTimer.start();
    Global::greeter()->authenticate(ui->userInput->text());
}

void LoginForm::onPrompt(QString prompt, QLightDM::Greeter::PromptType promptType)
{
	std::cerr << "Prompt: " << prompt.toStdString() << std::endl;
	Global::greeter()->respond(ui->passwordInput->text());
	ui->passwordInput->clear();
}

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

void LoginForm::onMessage(QString message, QLightDM::Greeter::MessageType type)
{
	std::cerr << "Message: " << message.toStdString() << std::endl;
	showMessage(message, false);
	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 (Global::greeter()->isAuthenticated()) {
    	std::cerr << "Auth complete, start session" << std::endl;
    	showMessage(tr("Starting session..."), false);
        if (Global::startSession()) {
        	cancelLoginTimer.stop();
        } else {
        	showMessage(tr("Cannot open session"), true);
        	clearMsg = true;
        }
    } else {
    	std::cerr << "Auth failed, cancelling..." << std::endl;
    	cancelLogin();
    }
}

void LoginForm::cancelLogin()
{
	std::cerr << "Cancel login" << std::endl;
    if (Global::greeter()->inAuthentication()) {
		std::cerr << "Was in authentication" << std::endl;
		Global::greeter()->cancelAuthentication();
	}
	cancelLoginTimer.stop();
	ui->passwordInput->clear();
	ui->userInput->setEnabled(true);
	ui->passwordInput->setEnabled(true);
	if (!clearMsg) {
		showMessage(tr("Login failed"), true);
	} else {
		ui->messageLabel->setStyleSheet("color:red");
	}
	ui->userInput->setFocus();
	ui->userInput->selectAll();
	clearMsg = true;
}

void LoginForm::showMessage(QString message, bool error)
{
	hideMessageTimer.stop();
	ui->messageLabel->setText(message);
	if (error) {
		ui->messageLabel->setStyleSheet("color:red");
		hideMessageTimer.start();
	} else {
		ui->messageLabel->setStyleSheet("");
	}
}

void LoginForm::hideMessage()
{
	hideMessageTimer.stop();
	ui->messageLabel->clear();
}

void LoginForm::keyPressEvent(QKeyEvent *event)
{
	if (clearMsg) {
		clearMsg = false;
		hideMessage();
	}
    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);
}