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#include <QtGui>

#include <QtWebKit>

#include <QSslSocket>

#include "googlechat.h"

#define GOOGLECHAT_URL "http://talkgadget.google.com/talkgadget/m"

GoogleChat::GoogleChat(): QWidget() {

    form.setupUi(this);

    setFixedSize(320, 480);

    form.userNameEdit->setFocus();

    connect(form.userNameEdit, SIGNAL(textChanged(QString)), SLOT(adjustLoginButton()));

    connect(form.userNameEdit, SIGNAL(returnPressed()), SLOT(inputPassword()));

    connect(form.passwordEdit, SIGNAL(textChanged(QString)), SLOT(adjustLoginButton()));

    connect(form.passwordEdit, SIGNAL(returnPressed()), SLOT(doLogin()));

    form.loginButton->setEnabled(false);

    connect(form.loginButton, SIGNAL(clicked()), SLOT(doLogin()));

    connect(form.webView, SIGNAL(loadFinished(bool)), SLOT(initialPage(bool)));

    connect(form.webView, SIGNAL(loadProgress(int)),

            form.progressBar, SLOT(setValue(int)));

    form.webView->setUrl((QUrl(GOOGLECHAT_URL)));

    form.webView->setContextMenuPolicy(Qt::PreventContextMenu);

    showStatus("Wait...");

}

void GoogleChat::showStatus(const QString &msg) {

    form.statusLabel->setText(msg);

    form.stackedWidget->setCurrentIndex(0);

}

void GoogleChat::showError(const QString &msg) {

    form.progressBar->hide();

    showStatus(QString("Error: %1").arg(msg));

}

QWebElement GoogleChat::document() const {

    return form.webView->page()->mainFrame()->documentElement();

}

void GoogleChat::adjustLoginButton() {

    userName = form.userNameEdit->text();

    password = form.passwordEdit->text();

    bool ok = !userName.isEmpty() && !password.isEmpty();

    form.loginButton->setEnabled(ok);

}

void GoogleChat::inputPassword() {

    if (!form.userNameEdit->text().isEmpty())

        form.passwordEdit->setFocus();

}

void GoogleChat::doLogin() {

    userName = form.userNameEdit->text();

    password = form.passwordEdit->text();

    bool ok = !userName.isEmpty() && !password.isEmpty();

    if (!ok)

        return;

    form.progressBar->setValue(0);

    form.progressBar->show();

    connect(form.webView, SIGNAL(loadFinished(bool)), SLOT(loginPage(bool)));

    connect(form.webView, SIGNAL(loadProgress(int)),

            form.progressBar, SLOT(setValue(int)));

    showStatus("Logging in...");

    QString userEmail = userName + "@gmail.com";

    document().findFirst("#Email").setAttribute("value", userEmail);

    document().findFirst("#Passwd").setAttribute("value", password);

    document().findFirst("#gaia_loginform").evaluateJavaScript("this.submit();");

}

void GoogleChat::initialPage(bool ok) {

    if (!QSslSocket::supportsSsl()) {

        showError("This example requires SSL support.");

        return;

    }

    if (ok) {

        QWebElement email = document().findFirst("#Email");

        QWebElement passwd = document().findFirst("#Passwd");

        QWebElement loginForm = document().findFirst("#gaia_loginform");

        if (!email.isNull() && !passwd.isNull() && !loginForm.isNull()) {

            form.stackedWidget->setCurrentIndex(1);

            form.userNameEdit->setFocus();

            form.webView->disconnect();

            return;

        }

    }

    showError("SERVICE unavailable.");

}

void GoogleChat::hideElements()

{

    document().findFirst(".footer-footer").removeFromDocument();

    document().findFirst(".title-bar-bg .title-bar").removeFromDocument();

    QTimer::singleShot(2000, this, SLOT(hideElements()));

}

void GoogleChat::loginPage(bool ok) {

    QString location = form.webView->url().toString();

    if (!ok) {

        if (location.indexOf("CheckCookie"))

            return;

        showError("Service unavailable");

    } else {

        // check for any error message

        QWebElement  e = document().findFirst(".errormsg");

        if (e.isNull()) {

            form.stackedWidget->setCurrentIndex(2);

            QTimer::singleShot(500, this, SLOT(hideElements()));

            return;

        }

       QString err = "Unknown login failure.";

       const QString errorMessage = e.toPlainText();

        if (!errorMessage.isEmpty()) {

            err = errorMessage;

            err = err.simplified();

        }

        showError(err);

    }

}