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#include <QtGui>

#include <QtNetwork>

#include "httpwindow.h"

#include "ui_authenticationdialog.h"

HttpWindow::HttpWindow(QWidget *parent)

    : QDialog(parent)

{

#ifndef QT_NO_OPENSSL

    urlLineEdit = new QLineEdit("https://");

#else

    urlLineEdit = new QLineEdit("http://");

#endif

    urlLabel = new QLabel(tr("&URL:"));

    urlLabel->setBuddy(urlLineEdit);

    statusLabel = new QLabel(tr("Please enter the URL of a file you want to "

                                "download."));

    downloadButton = new QPushButton(tr("Download"));

    downloadButton->setDefault(true);

    quitButton = new QPushButton(tr("Quit"));

    quitButton->setAutoDefault(false);

    buttonBox = new QDialogButtonBox;

    buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);

    buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

    progressDialog = new QProgressDialog(this);

    http = new QHttp(this);

    connect(urlLineEdit, SIGNAL(textChanged(QString)),

            this, SLOT(enableDownloadButton()));

    connect(http, SIGNAL(requestFinished(int,bool)),

            this, SLOT(httpRequestFinished(int,bool)));

    connect(http, SIGNAL(dataReadProgress(int,int)),

            this, SLOT(updateDataReadProgress(int,int)));

    connect(http, SIGNAL(responseHeaderReceived(QHttpResponseHeader)),

            this, SLOT(readResponseHeader(QHttpResponseHeader)));

    connect(http, SIGNAL(authenticationRequired(QString,quint16,QAuthenticator*)),

            this, SLOT(slotAuthenticationRequired(QString,quint16,QAuthenticator*)));

#ifndef QT_NO_OPENSSL

    connect(http, SIGNAL(sslErrors(QList<QSslError>)),

            this, SLOT(sslErrors(QList<QSslError>)));

#endif

    connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));

    connect(downloadButton, SIGNAL(clicked()), this, SLOT(downloadFile()));

    connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

    QHBoxLayout *topLayout = new QHBoxLayout;

    topLayout->addWidget(urlLabel);

    topLayout->addWidget(urlLineEdit);

    QVBoxLayout *mainLayout = new QVBoxLayout;

    mainLayout->addLayout(topLayout);

    mainLayout->addWidget(statusLabel);

    mainLayout->addWidget(buttonBox);

    setLayout(mainLayout);

    setWindowTitle(tr("HTTP"));

    urlLineEdit->setFocus();

}

void HttpWindow::downloadFile()

{

    QUrl url(urlLineEdit->text());

    QFileInfo fileInfo(url.path());

    QString fileName = fileInfo.fileName();

    if (fileName.isEmpty())

        fileName = "index.html";

    if (QFile::exists(fileName)) {

        if (QMessageBox::question(this, tr("HTTP"), 

                                  tr("There already exists a file called %1 in "

                                     "the current directory. Overwrite?").arg(fileName),

                                  QMessageBox::Yes|QMessageBox::No, QMessageBox::No)

            == QMessageBox::No)

            return;

        QFile::remove(fileName);

    }

    file = new QFile(fileName);

    if (!file->open(QIODevice::WriteOnly)) {

        QMessageBox::information(this, tr("HTTP"),

                                 tr("Unable to save the file %1: %2.")

                                 .arg(fileName).arg(file->errorString()));

        delete file;

        file = 0;

        return;

    }

    QHttp::ConnectionMode mode = url.scheme().toLower() == "https" ? QHttp::ConnectionModeHttps : QHttp::ConnectionModeHttp;

    http->setHost(url.host(), mode, url.port() == -1 ? 0 : url.port());

    if (!url.userName().isEmpty())

        http->setUser(url.userName(), url.password());

    httpRequestAborted = false;

    QByteArray path = QUrl::toPercentEncoding(url.path(), "!$&'()*+,;=:@/");

    if (path.isEmpty())

        path = "/";

    httpGetId = http->get(path, file);

    progressDialog->setWindowTitle(tr("HTTP"));

    progressDialog->setLabelText(tr("Downloading %1.").arg(fileName));

    downloadButton->setEnabled(false);

}

void HttpWindow::cancelDownload()

{

    statusLabel->setText(tr("Download canceled."));

    httpRequestAborted = true;

    http->abort();

    downloadButton->setEnabled(true);

}

void HttpWindow::httpRequestFinished(int requestId, bool error)

{

    if (requestId != httpGetId)

        return;

    if (httpRequestAborted) {

        if (file) {

            file->close();

            file->remove();

            delete file;

            file = 0;

        }

        progressDialog->hide();

        return;

    }

    if (requestId != httpGetId)

        return;

    progressDialog->hide();

    file->close();

    if (error) {

        file->remove();

        QMessageBox::information(this, tr("HTTP"),

                                 tr("Download failed: %1.")

                                 .arg(http->errorString()));

    } else {

        QString fileName = QFileInfo(QUrl(urlLineEdit->text()).path()).fileName();

        statusLabel->setText(tr("Downloaded %1 to current directory.").arg(fileName));

    }

    downloadButton->setEnabled(true);

    delete file;

    file = 0;

}

void HttpWindow::readResponseHeader(const QHttpResponseHeader &responseHeader)

{

    switch (responseHeader.statusCode()) {

    case 200:                   // Ok

    case 301:                   // Moved Permanently

    case 302:                   // Found

    case 303:                   // See Other

    case 307:                   // Temporary Redirect

        // these are not error conditions

        break;

    default:

        QMessageBox::information(this, tr("HTTP"),

                                 tr("Download failed: %1.")

                                 .arg(responseHeader.reasonPhrase()));

        httpRequestAborted = true;

        progressDialog->hide();

        http->abort();

    }

}

void HttpWindow::updateDataReadProgress(int bytesRead, int totalBytes)

{

    if (httpRequestAborted)

        return;

    progressDialog->setMaximum(totalBytes);

    progressDialog->setValue(bytesRead);

}

void HttpWindow::enableDownloadButton()

{

    downloadButton->setEnabled(!urlLineEdit->text().isEmpty());

}

void HttpWindow::slotAuthenticationRequired(const QString &hostName, quint16, QAuthenticator *authenticator)

{

    QDialog dlg;

    Ui::Dialog ui;

    ui.setupUi(&dlg);

    dlg.adjustSize();

    ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm()).arg(hostName));

    if (dlg.exec() == QDialog::Accepted) {

        authenticator->setUser(ui.userEdit->text());

        authenticator->setPassword(ui.passwordEdit->text());

    }

}

#ifndef QT_NO_OPENSSL

void HttpWindow::sslErrors(const QList<QSslError> &errors)

{

    QString errorString;

    foreach (const QSslError &error, errors) {

        if (!errorString.isEmpty())

            errorString += ", ";

        errorString += error.errorString();

    }

    if (QMessageBox::warning(this, tr("HTTP Example"),

                             tr("One or more SSL errors has occurred: %1").arg(errorString),

                             QMessageBox::Ignore | QMessageBox::Abort) == QMessageBox::Ignore) {

        http->ignoreSslErrors();

    }

}

#endif