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#include "download.h"
#include "ui_authenticationdialog.h"
download::download(QWidget *parent) :
    QObject()
{
    g_isComplete=false;
    connect(&qnam, SIGNAL(authenticationRequired(QNetworkReply*,QAuthenticator*)),
                this, SLOT(slotAuthenticationRequired(QNetworkReply*,QAuthenticator*)));
}
void download::sslErrors(QNetworkReply*,const QList<QSslError> &errors)
{
    QString errorString;
    foreach (const QSslError &error, errors) {
        if (!errorString.isEmpty())
            errorString += ", ";
        errorString += error.errorString();
    }

    if (QMessageBox::warning(0, tr("HTTP"),
                             tr("One or more SSL errors has occurred: %1").arg(errorString),
                             QMessageBox::Ignore | QMessageBox::Abort) == QMessageBox::Ignore) {
        reply->ignoreSslErrors();
    }
}
void download::setInfo(QUrl query, QUrl urlAdress, QString newName){
    queryString = query.toString();
    url = urlAdress;
    fileName = newName;
}
bool download::isComplete(){
    return g_isComplete;
}

void download::httpFinished()
{
    file->flush();
    file->close();
    QVariant redirectionTarget = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
    if (reply->error()) {
        file->remove();
    } else if (!redirectionTarget.isNull()) {
        QUrl newUrl = url.resolved(redirectionTarget.toUrl());
        if (QMessageBox::question(0, tr("HTTP"),
                                  tr("Redirect to %1 ?").arg(newUrl.toString()),
                                  QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes) {
            url = newUrl;
            reply->deleteLater();
            file->open(QIODevice::WriteOnly);
            file->resize(0);
            startRequest(url);
            return;
        }
    } else {
        //file->close();
    }

    reply->deleteLater();
    reply = 0;
    delete file;
    file = 0;
    g_isComplete=true;
}

void download::startRequest(QUrl url)
{
    QNetworkRequest request(url);
    QByteArray data;
    QList<QNetworkCookie> cookies;
    cookies.append(QNetworkCookie("PHPSESSID", "a0be8t0253m4lvo5hlv20j2ns5"));
    request.setHeader(QNetworkRequest::ContentTypeHeader,"application/x-www-form-urlencoded");
    request.setHeader(QNetworkRequest::CookieHeader, QVariant::fromValue(cookies));
    data = queryString.toAscii();

    reply = qnam.post(request,data);

    connect(reply, SIGNAL(finished()),
            this, SLOT(httpFinished()));
    connect(reply, SIGNAL(readyRead()),
            this, SLOT(httpReadyRead()));

}

void download::slotAuthenticationRequired(QNetworkReply*,QAuthenticator *authenticator)
{
    QDialog dlg;
    Ui::Dialog ui;
    ui.setupUi(&dlg);
    dlg.adjustSize();
    ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm()).arg(url.host()));

    // Did the URL have information? Fill the UI
    // this is only relevant if the URL-supplied credentials were wrong

}
void download::httpReadyRead()
{
    // this slot gets called every time the QNetworkReply has new data.
    // We read all of its new data and write it into the file.
    // That way we use less RAM than when reading it at the finished()
    // signal of the QNetworkReply
    if (file)
        file->write(reply->readAll());
}
void download::startDownload(){
    g_isComplete=false;
    if(fileName.isEmpty() || fileName.isNull() || url.isEmpty() || (!url.isValid())){
        QMessageBox::critical(0,"Error","Name of file or URL is empty or incorrect.");
        return;
    }
    file = new QFile(fileName);
    if (!file->open(QIODevice::WriteOnly)) {
        QMessageBox::information(0, tr("HTTP"),
                                 tr("Unable to save the file %1: %2.")
                                 .arg(fileName).arg(file->errorString()));
        delete file;
        file = 0;
        return;
    }   
    startRequest(url);

}