/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2006-2011 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

#include <QGridLayout>

#include <QPushButton>

#include <QNetworkAccessManager>

#include <QNetworkRequest>

#include <QNetworkReply>

#include <QFileInfo>

#include <QFileDialog>

#include <QDebug>

#include <QProgressBar>

#include <QBuffer>

#include "pagedata.h"

#include "databrowser.h"

#include "hwconsts.h"

#include "quazip.h"

#include "quazipfile.h"

PageDataDownload::PageDataDownload(QWidget* parent) : AbstractPage(parent)

{

    QGridLayout * pageLayout = new QGridLayout(this);

    pageLayout->setColumnStretch(0, 1);

    pageLayout->setColumnStretch(1, 1);

    pageLayout->setColumnStretch(2, 1);

    BtnBack = addButton(":/res/Exit.png", pageLayout, 2, 0, true);

    web = new DataBrowser(this);

    connect(web, SIGNAL(anchorClicked(QUrl)), this, SLOT(request(const QUrl&)));

    web->setOpenLinks(false);

    pageLayout->addWidget(web, 0, 0, 1, 3);

    progressBarsLayout = new QVBoxLayout();

    pageLayout->addLayout(progressBarsLayout, 1, 0, 1, 3);

    web->setHtml("<center><h2>Hedgewars Downloadable Content</h2><br><br><i>Loading, please wait</i></center>");

}

void PageDataDownload::request(const QUrl &url)

{

    QUrl finalUrl;

    if(url.host().isEmpty())

        finalUrl = QUrl("http://www.hedgewars.org" + url.path());

    else

        finalUrl = url;

    if(url.path().endsWith(".zip"))

    {

        qWarning() << "Download Request" << url.toString();

        QString fileName = QFileInfo(url.toString()).fileName();

        QNetworkRequest newRequest(finalUrl);

        newRequest.setAttribute(QNetworkRequest::User, fileName);

        QNetworkAccessManager *manager = new QNetworkAccessManager(this);

        QNetworkReply *reply = manager->get(newRequest);

        connect(reply, SIGNAL(finished()), this, SLOT(fileDownloaded()));

        connect(reply, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(downloadProgress(qint64, qint64)));

        QProgressBar *progressBar = new QProgressBar(this);

        progressBarsLayout->addWidget(progressBar);

        progressBars.insert(reply, progressBar);

    } else

    {

        qWarning() << "Page Request" << url.toString();

        QNetworkRequest newRequest(finalUrl);

        QNetworkAccessManager *manager = new QNetworkAccessManager(this);

        QNetworkReply *reply = manager->get(newRequest);

        connect(reply, SIGNAL(finished()), this, SLOT(pageDownloaded()));

    }

}

void PageDataDownload::pageDownloaded()

{

    QNetworkReply * reply = qobject_cast<QNetworkReply *>(sender());

    if(reply && (reply->error() == QNetworkReply::NoError))

    {

        QString html = QString::fromUtf8(reply->readAll());

        int begin = html.indexOf("<!-- BEGIN -->");

        int end = html.indexOf("<!-- END -->");

        if(begin != -1 && begin < end)

        {

            html.truncate(end);

            html.remove(0, begin);

        }

        web->setHtml(html);

    }

    else

    {

        web->setHtml("<center><h2>Hedgewars Downloadable Content</h2><br><br><p><i><h4>This page requires an internet connection.</i></h4></center>");

    }

}

void PageDataDownload::fileDownloaded()

{

    QNetworkReply * reply = qobject_cast<QNetworkReply *>(sender());

    if(reply)

    {

        QByteArray fileContents = reply->readAll();

        QProgressBar *progressBar = progressBars.value(reply, 0);

        if(progressBar)

        {

            progressBars.remove(reply);

            progressBar->deleteLater();

        }

        extractDataPack(&fileContents);

    }

}

void PageDataDownload::downloadProgress(qint64 bytesRecieved, qint64 bytesTotal)

{

    QNetworkReply * reply = qobject_cast<QNetworkReply *>(sender());

    if(reply)

    {

        QProgressBar *progressBar = progressBars.value(reply, 0);

        if(progressBar)

        {

            progressBar->setValue(bytesRecieved);

            progressBar->setMaximum(bytesTotal);

        }

    }

}

void PageDataDownload::fetchList()

{

    request(QUrl("http://www.hedgewars.org/content.html"));

}

bool PageDataDownload::extractDataPack(QByteArray * buf)

{

    QBuffer buffer;

    buffer.setBuffer(buf);

    QuaZip zip;

    zip.setIoDevice(&buffer);

    if(!zip.open(QuaZip::mdUnzip))

    {

      qWarning("testRead(): zip.open(): %d", zip.getZipError());

      return false;

    }

    QuaZipFile file(&zip);

    QDir extractDir(*cfgdir);

    extractDir.cd("Data");

    for(bool more = zip.goToFirstFile(); more; more = zip.goToNextFile())

    {

        if(!file.open(QIODevice::ReadOnly))

        {

            qWarning("file.open(): %d", file.getZipError());

            return false;

        }

        QString fileName = file.getActualFileName();

        QString filePath = extractDir.filePath(fileName);

        if (fileName.endsWith("/"))

        {

            QFileInfo fi(filePath);

            QDir().mkpath(fi.filePath());

        } else

        {

            qDebug() << "Extracting" << filePath;

            QFile out(filePath);

            if(!out.open(QFile::WriteOnly))

            {

                qWarning() << "out.open():" << out.errorString();

                return false;

            }

            out.write(file.readAll());

            out.close();

            if(file.getZipError() != UNZ_OK) {

                qWarning("file.getFileName(): %d", file.getZipError());

                return false;

            }

            if(!file.atEnd()) {

                qWarning("read all but not EOF");

                return false;

            }

        }

        file.close();

        if(file.getZipError()!=UNZ_OK) {

            qWarning("file.close(): %d", file.getZipError());

            return false;

        }

    }

    zip.close();

    return true;

}