/*
 * This file Copyright (C) 2009-2015 Mnemosyne LLC
 *
 * It may be used under the GNU GPL versions 2 or 3
 * or any future license endorsed by Mnemosyne LLC.
 *
 */

#include <QDir>
#include <QFileInfo>
#include <QMimeData>
#include <QPushButton>
#include <QTimer>

#include <libtransmission/transmission.h>
#include <libtransmission/makemeta.h>
#include <libtransmission/utils.h>

#include "ColumnResizer.h"
#include "Formatter.h"
#include "MakeDialog.h"
#include "Session.h"
#include "Utils.h"

#include "ui_MakeProgressDialog.h"

namespace
{

class MakeProgressDialog : public BaseDialog
{
    Q_OBJECT

public:
    MakeProgressDialog(Session& session, tr_metainfo_builder& builder, QWidget* parent = nullptr);

private slots:
    void onButtonBoxClicked(QAbstractButton* button);
    void onProgress();

private:
    Session& mySession;
    tr_metainfo_builder& myBuilder;
    Ui::MakeProgressDialog ui;
    QTimer myTimer;
};

} // namespace

MakeProgressDialog::MakeProgressDialog(Session& session, tr_metainfo_builder& builder, QWidget* parent) :
    BaseDialog(parent),
    mySession(session),
    myBuilder(builder)
{
    ui.setupUi(this);

    connect(ui.dialogButtons, SIGNAL(clicked(QAbstractButton*)), this, SLOT(onButtonBoxClicked(QAbstractButton*)));

    connect(&myTimer, SIGNAL(timeout()), this, SLOT(onProgress()));
    myTimer.start(100);

    onProgress();
}

void MakeProgressDialog::onButtonBoxClicked(QAbstractButton* button)
{
    switch (ui.dialogButtons->standardButton(button))
    {
    case QDialogButtonBox::Open:
        mySession.addNewlyCreatedTorrent(QString::fromUtf8(myBuilder.outputFile),
            QFileInfo(QString::fromUtf8(myBuilder.top)).dir().path());
        break;

    case QDialogButtonBox::Abort:
        myBuilder.abortFlag = true;
        break;

    default: // QDialogButtonBox::Ok:
        break;
    }

    close();
}

void MakeProgressDialog::onProgress()
{
    // progress bar
    tr_metainfo_builder const& b = myBuilder;
    double const denom = b.pieceCount != 0 ? b.pieceCount : 1;
    ui.progressBar->setValue(static_cast<int>((100.0 * b.pieceIndex) / denom));

    // progress label
    QString const top = QString::fromUtf8(b.top);
    QString const base(QFileInfo(top).completeBaseName());
    QString str;

    if (!b.isDone)
    {
        str = tr("Creating \"%1\"").arg(base);
    }
    else if (b.result == TR_MAKEMETA_OK)
    {
        str = tr("Created \"%1\"!").arg(base);
    }
    else if (b.result == TR_MAKEMETA_URL)
    {
        str = tr("Error: invalid announce URL \"%1\"").arg(QString::fromUtf8(b.errfile));
    }
    else if (b.result == TR_MAKEMETA_CANCELLED)
    {
        str = tr("Cancelled");
    }
    else if (b.result == TR_MAKEMETA_IO_READ)
    {
        str = tr("Error reading \"%1\": %2").arg(QString::fromUtf8(b.errfile)).
            arg(QString::fromLocal8Bit(tr_strerror(b.my_errno)));
    }
    else if (b.result == TR_MAKEMETA_IO_WRITE)
    {
        str = tr("Error writing \"%1\": %2").arg(QString::fromUtf8(b.errfile)).
            arg(QString::fromLocal8Bit(tr_strerror(b.my_errno)));
    }

    ui.progressLabel->setText(str);

    // buttons
    ui.dialogButtons->button(QDialogButtonBox::Abort)->setEnabled(!b.isDone);
    ui.dialogButtons->button(QDialogButtonBox::Ok)->setEnabled(b.isDone);
    ui.dialogButtons->button(QDialogButtonBox::Open)->setEnabled(b.isDone && b.result == TR_MAKEMETA_OK);
}

#include "MakeDialog.moc"

/***
****
***/

void MakeDialog::makeTorrent()
{
    if (myBuilder == nullptr)
    {
        return;
    }

    // get the tiers
    int tier = 0;
    QVector<tr_tracker_info> trackers;

    for (QString const& line : ui.trackersEdit->toPlainText().split(QLatin1Char('\n')))
    {
        QString const announceUrl = line.trimmed();

        if (announceUrl.isEmpty())
        {
            ++tier;
        }
        else
        {
            tr_tracker_info tmp;
            tmp.announce = tr_strdup(announceUrl.toUtf8().constData());
            tmp.tier = tier;
            trackers.append(tmp);
        }
    }

    // the file to create
    QString const path = QString::fromUtf8(myBuilder->top);
    QString const torrentName = QFileInfo(path).completeBaseName() + QLatin1String(".torrent");
    QString const target = QDir(ui.destinationButton->path()).filePath(torrentName);

    // comment
    QString comment;

    if (ui.commentCheck->isChecked())
    {
        comment = ui.commentEdit->text();
    }

    // start making the torrent
    tr_makeMetaInfo(myBuilder.get(), target.toUtf8().constData(), trackers.isEmpty() ? nullptr : trackers.data(),
        trackers.size(), comment.isEmpty() ? nullptr : comment.toUtf8().constData(), ui.privateCheck->isChecked());

    // pop up the dialog
    auto* dialog = new MakeProgressDialog(mySession, *myBuilder, this);
    dialog->setAttribute(Qt::WA_DeleteOnClose);
    dialog->open();
}

/***
****
***/

QString MakeDialog::getSource() const
{
    return (ui.sourceFileRadio->isChecked() ? ui.sourceFileButton : ui.sourceFolderButton)->path();
}

/***
****
***/

void MakeDialog::onSourceChanged()
{
    myBuilder.reset();

    QString const filename = getSource();

    if (!filename.isEmpty())
    {
        myBuilder.reset(tr_metaInfoBuilderCreate(filename.toUtf8().constData()));
    }

    QString text;

    if (myBuilder == nullptr)
    {
        text = tr("<i>No source selected</i>");
    }
    else
    {
        QString files = tr("%Ln File(s)", nullptr, myBuilder->fileCount);
        QString pieces = tr("%Ln Piece(s)", nullptr, myBuilder->pieceCount);
        text = tr("%1 in %2; %3 @ %4").arg(Formatter::sizeToString(myBuilder->totalSize)).arg(files).arg(pieces).
            arg(Formatter::sizeToString(myBuilder->pieceSize));
    }

    ui.sourceSizeLabel->setText(text);
}

MakeDialog::MakeDialog(Session& session, QWidget* parent) :
    BaseDialog(parent),
    mySession(session),
    myBuilder(nullptr, &tr_metaInfoBuilderFree)
{
    ui.setupUi(this);

    ui.destinationButton->setMode(PathButton::DirectoryMode);
    ui.destinationButton->setPath(QDir::homePath());

    ui.sourceFolderButton->setMode(PathButton::DirectoryMode);
    ui.sourceFileButton->setMode(PathButton::FileMode);

    auto* cr = new ColumnResizer(this);
    cr->addLayout(ui.filesSectionLayout);
    cr->addLayout(ui.propertiesSectionLayout);
    cr->update();

    resize(minimumSizeHint());

    connect(ui.sourceFolderRadio, SIGNAL(toggled(bool)), this, SLOT(onSourceChanged()));
    connect(ui.sourceFolderButton, SIGNAL(pathChanged(QString)), this, SLOT(onSourceChanged()));
    connect(ui.sourceFileRadio, SIGNAL(toggled(bool)), this, SLOT(onSourceChanged()));
    connect(ui.sourceFileButton, SIGNAL(pathChanged(QString)), this, SLOT(onSourceChanged()));

    connect(ui.dialogButtons, SIGNAL(accepted()), this, SLOT(makeTorrent()));
    connect(ui.dialogButtons, SIGNAL(rejected()), this, SLOT(close()));

    onSourceChanged();
}

MakeDialog::~MakeDialog() = default;

/***
****
***/

void MakeDialog::dragEnterEvent(QDragEnterEvent* event)
{
    QMimeData const* mime = event->mimeData();

    if (!mime->urls().isEmpty() && QFileInfo(mime->urls().front().path()).exists())
    {
        event->acceptProposedAction();
    }
}

void MakeDialog::dropEvent(QDropEvent* event)
{
    QString const filename = event->mimeData()->urls().front().path();
    QFileInfo const fileInfo(filename);

    if (fileInfo.exists())
    {
        if (fileInfo.isDir())
        {
            ui.sourceFolderRadio->setChecked(true);
            ui.sourceFolderButton->setPath(filename);
        }
        else // it's a file
        {
            ui.sourceFileRadio->setChecked(true);
            ui.sourceFileButton->setPath(filename);
        }
    }
}