#include "downloaditem.h"
#include "ui_downloaditem.h"

DownloadItem::DownloadItem(QListWidgetItem *item, QNetworkReply *reply, QString path, QString fileName, QPixmap fileIcon, QWidget *parent)
    : QWidget(parent)
   ,ui(new Ui::DownloadItem)
   ,m_item(item)
   ,m_reply(reply)
   ,m_path(path)
   ,m_fileName(fileName)
   ,m_downloading(false)
{
    QString fullPath = path+fileName;
    if (QFile::exists(fullPath))
        QFile::remove(fullPath);

    m_outputFile.setFileName(fullPath);

    ui->setupUi(this);
    ui->button->setPixmap(
#ifdef Q_WS_X11
                style()->standardIcon(QStyle::SP_BrowserStop).pixmap(20,20)
#else
                QIcon(":/icons/faenza/stop.png").pixmap(20,20)
#endif
                );
    ui->fileName->setText(m_fileName);
    ui->downloadInfo->setText(tr("Remaining time unavailable"));
    ui->fileIcon->setPixmap(fileIcon);

    setContextMenuPolicy(Qt::CustomContextMenu);
    connect(this, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(customContextMenuRequested(QPoint)));
    connect(m_reply, SIGNAL(finished()), this, SLOT(finished()));
    connect(m_reply, SIGNAL(readyRead()), this, SLOT(readyRead()));
    connect(m_reply, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(downloadProgress(qint64, qint64)));
    connect(m_reply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(error(QNetworkReply::NetworkError)));
    connect(ui->button, SIGNAL(clicked(QPoint)), this, SLOT(stop()));

    m_downloading = true;
    m_downTimer.start();
    m_timer.start(1000*1, this);
    readyRead();
    QTimer::singleShot(500, this, SLOT(updateDownload()));

    if (m_reply->error() != QNetworkReply::NoError) {
        stop();
        error(m_reply->error());
    }
    show();
}

void DownloadItem::finished()
{
    m_timer.stop();
    ui->downloadInfo->setText(tr("Done - %1").arg(m_reply->url().host()));
    ui->progressBar->hide();
    ui->button->hide();
    ui->frame->hide();
    m_outputFile.close();

    m_item->setSizeHint(sizeHint());
#if QT_VERSION == 0x040700 // Workaround
    ui->button->show();
    ui->button->hide();
#endif
    m_downloading = false;
}

void DownloadItem::downloadProgress(qint64 received, qint64 total)
{
    qint64 currentValue = 0;
    qint64 totalValue = 0;
    if (total > 0) {
        currentValue = received * 100 / total;
        totalValue = 100;
    }
    ui->progressBar->setValue(currentValue);
    ui->progressBar->setMaximum(totalValue);
    m_currSpeed = received * 1000.0 / m_downTimer.elapsed();
    m_received = received;
    m_total = total;
}

void DownloadItem::timerEvent(QTimerEvent *event)
{
    if (event->timerId() == m_timer.timerId()) {
        updateDownloadInfo(m_currSpeed, m_received, m_total);
    } else
        QWidget::timerEvent(event);
}

int DownloadItem::progress()
{
    return ui->progressBar->value();
}

bool DownloadItem::isCancelled()
{
    return ui->downloadInfo->text().startsWith(tr("Cancelled"));
}

QString DownloadItem::remaingTimeToString(QTime time)
{
    if (time<QTime(0, 0, 10))
        return tr("few seconds");
    else if (time<QTime(0, 1))
        return time.toString("s")+" "+tr("seconds");
    else if (time<QTime(1, 0))
        return time.toString("m")+" "+tr("minutes");
    else
        return time.toString("h")+" "+tr("hours");
}

QString DownloadItem::currentSpeedToString(double speed)
{
    speed/=1024; // Conversion to kB/s
    if (speed>1000) {
        speed/=1024;
        return QString::number(speed, 'g', 3)+" MB/s";
    }else
        return QString::number(speed, 'g', 3)+" kB/s";
}

QString DownloadItem::fileSizeToString(int size)
{
    size/=1024;
    if (size>1000) {
        size/=1024;
        return QString::number(size)+" MB";
    }else
        return QString::number(size)+" kB";
}

void DownloadItem::updateDownloadInfo(double currSpeed, qint64 received, qint64 total)
{
    //            QString          QString       QString     QString
    //          | m_remTime |   |m_currSize|  |m_fileSize|  |m_speed|
    // Remaining 26 minutes -     339MB of      693 MB        (350kB/s)

    int estimatedTime=((total-received)/1024) / (currSpeed/1024);
    QString speed = currentSpeedToString(currSpeed);
    // We have QString speed now

    QTime time;
    time = time.addSecs(estimatedTime);
    QString remTime = remaingTimeToString(time);
    m_remTime = time;

    QString currSize = fileSizeToString(received);
    QString fileSize = fileSizeToString(total);

    ui->downloadInfo->setText(tr("Remaining %1 - %2 of %3 (%4)").arg(remTime, currSize, fileSize, speed));
}

void DownloadItem::stop()
{
    m_timer.stop();
    m_reply->abort();
    QString outputfile = QFileInfo(m_outputFile).absoluteFilePath();
    m_outputFile.close();
    ui->downloadInfo->setText(tr("Cancelled - %1").arg(m_reply->url().host()));
    ui->progressBar->hide();
    ui->button->hide();
    m_item->setSizeHint(sizeHint());

#if QT_VERSION == 0x040700 // Workaround
    ui->button->show();
    ui->button->hide();
#endif

    QFile::remove(outputfile);
    m_downloading = false;
}

void DownloadItem::mouseDoubleClickEvent(QMouseEvent *e)
{
    openFile();
    e->accept();
}

void DownloadItem::customContextMenuRequested(QPoint pos)
{
    QMenu menu;
    menu.addAction(QIcon::fromTheme("document-open"), tr("Open File"), this, SLOT(openFile()));

    menu.addAction(tr("Open Folder"), this, SLOT(openFolder()));
    menu.addSeparator();
    menu.addAction(
#ifdef Q_WS_X11
                   style()->standardIcon(QStyle::SP_BrowserStop)
#else
                   QIcon(":/icons/faenza/stop.png")
#endif
                   ,tr("Cancel downloading"), this, SLOT(stop()));
    menu.addAction(QIcon::fromTheme("window-close"), tr("Clear"), this, SLOT(clear()));

    if (m_downloading || ui->downloadInfo->text().startsWith(tr("Cancelled")) || ui->downloadInfo->text().startsWith(tr("Error")))
        menu.actions().at(0)->setEnabled(false);
    if (!m_downloading)
        menu.actions().at(3)->setEnabled(false);
    if (m_downloading)
        menu.actions().at(4)->setEnabled(false);
    menu.exec(mapToGlobal(pos));
}

void DownloadItem::clear()
{
    emit deleteItem(this);
}

void DownloadItem::openFile()
{
    if (m_downloading)
        return;
    QFileInfo info(m_path+m_fileName);
    if (info.exists())
        QDesktopServices::openUrl(QUrl::fromLocalFile(info.absoluteFilePath()));
    else
        QMessageBox::warning(m_item->listWidget(), tr("Not found"), tr("Sorry, the file \n %1 \n is not found!").arg(info.absoluteFilePath()));
}

void DownloadItem::openFolder()
{
    QDesktopServices::openUrl(QUrl::fromLocalFile(m_path));
}

void DownloadItem::readyRead()
{
    if (!m_outputFile.isOpen() && !m_outputFile.open(QIODevice::WriteOnly)) {
        stop();
        ui->downloadInfo->setText(tr("Error: Cannot write to file!"));
        return;
    }
    m_outputFile.write(m_reply->readAll());
}

void DownloadItem::error(QNetworkReply::NetworkError error)
{
    if (error != QNetworkReply::NoError)
        ui->downloadInfo->setText(tr("Error: ")+m_reply->errorString());
}

void DownloadItem::updateDownload()
{
    if (ui->progressBar->maximum() == 0 && m_outputFile.isOpen() && m_reply->isFinished()) {
        downloadProgress(0,0);
        finished();
    }
}

DownloadItem::~DownloadItem()
{
    delete ui;
    delete m_item;
}