/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include <QGridLayout>

#include <QLabel>

#include <QList>

#include <QUrl>

#include <QRegExp>

#include <QNetworkAccessManager>

#include <QNetworkRequest>

#include <QMessageBox>

#include <QNetworkReply>

#include <QDebug>

#include <QMimeData>

#include "hwconsts.h"

#include "SDLInteraction.h"

#include "SDL.h"

#include "SDL_version.h"

#include "physfs.h"

#ifdef VIDEOREC

extern "C"

{

    #include "libavcodec/version.h"

    #include "libavformat/version.h"

    #include "libavutil/avutil.h" // version.h only from 51.36.0

}

#endif

#if defined(Q_OS_WINDOWS)

#define sopath(x) x ".dll"

#elif defined(Q_OS_MAC)

#define sopath(x) "@executable_path/../Frameworks/" x ".framework/" x

#else

#define sopath(x) "lib" x ".so"

#endif

#include "about.h"

QString About::getCreditsHtml()

{

    // Open the credits file

    /* *** FILE FORMAT OF CREDITS FILE ***

    The credits file is an RFC-4180-compliant CSV file with 3 columns:

    * Task/contribution

    * Contributor name

    * Contributor e-mail

    The first and last columns are optional.

    There are special rows, which are marked by putting a "!__" in the

    beginning of the first. The following special rows are supported:

    !__SECTION: Section. Column 1 is the section name

    !__SUBSECTION: Subsection. Column 1 is the subsection name

    !__MISC: Placeholder for other or unknown authors

    */

    QFile creditsFile(":/res/credits.csv");

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

    {

        qWarning("ERROR: Credits file could not be opened!");

        return "<p>ERROR: Credits file could not be opened!</p>";

    }

    QString creditsString = creditsFile.readAll();

    QString out = QString("<h1>" + tr("Credits") + "</h1>\n");

    QStringList cells = QStringList() << QString("") << QString("") << QString("");

    bool firstSection = true;

    unsigned long int column = 0;

    unsigned long int charInCell = 0;

    bool isInQuote = false;

    bool ignoreChar = false;

    bool lineComplete = false;

    QChar currChar;

    QChar prevChar;

    for(long long int i = 0; i<creditsString.length(); i++)

    {

        currChar = creditsString.at(i);

        QString task, name, mail;

        if(currChar == '"')

        {

            if(charInCell == 0)

            {

                isInQuote = true;

                ignoreChar = true;

            }

            else if(isInQuote && prevChar != '"')

            {

                ignoreChar = true;

            }

        }

        else if(isInQuote && charInCell > 0 && prevChar == '"' && (currChar == '\r' || currChar == ','))

        {

            isInQuote = false;

            ignoreChar = true;

        }

        charInCell++;

        if(!isInQuote && currChar == ',')

        {

            column++;

            charInCell = 0;

        }

        else if(!isInQuote && currChar == '\n' && prevChar == '\r')

        {

            lineComplete = true;

        }

        if(!isInQuote && (currChar == '\r' || currChar == '\n' || currChar == ','))

        {

            ignoreChar = true;

        }

        if(!ignoreChar)

        {

            cells[column].append(currChar);

        }

        ignoreChar = false;

        if(lineComplete)

        {

            task = cells[0];

            name = cells[1];

            mail = cells[2];

            if(task == "!__SECTION")

            {

                if (!firstSection)

                    out = out + "</ul>\n";

                out = out + "<h2>" + name + "</h2>\n<ul>\n";

                firstSection = false;

            }

            else if(task == "!__SUBSECTION")

            {

                out = out + "</ul>\n";

                out = out + "<h3>" + name + "</h3>\n<ul>\n";

            }

            else if(task == "!__MISC")

            {

                out = out + "<li>" + tr("Other people") + "</li>" + "\n";

            }

            else

            {

                QString mailLink = QString("<a href=\"mailto:%1\">%1</a>").arg(mail);

                if(task.isEmpty() && mail.isEmpty())

                {

                    out = out + "<li>" + name + "</li>\n";

                }

                else if(task.isEmpty())

                {

                    out = out + "<li>" + tr("%1 &lt;%2&gt;").arg(name).arg(mailLink) + "</li>\n";

                }

                else if(mail.isEmpty())

                {

                    out = out + "<li>" + tr("%1: %2").arg(task).arg(name) + "</li>\n";

                }

                else

                {

                    out = out + "<li>" + tr("%1: %2 &lt;%3&gt;").arg(task).arg(name).arg(mailLink) + "</li>\n";

                }

            }

            lineComplete = false;

            column = 0;

            cells[0] = "";

            cells[1] = "";

            cells[2] = "";

            charInCell = 0;

        }

        prevChar = currChar;

    }

    creditsFile.close();

    out = out + "</ul>";

    return out;

}

About::About(QWidget * parent) :

    QWidget(parent)

{

    QGridLayout *mainLayout = new QGridLayout(this);

    QVBoxLayout * leftLayout = new QVBoxLayout();

    mainLayout->addLayout(leftLayout, 0, 0, 2, 1);

    QLabel *imageLabel = new QLabel;

    QImage image(":/res/Hedgehog.png");

    imageLabel->setPixmap(QPixmap::fromImage(image));

    imageLabel->setFixedWidth(273);

    imageLabel->setFixedHeight(300);

    leftLayout->addWidget(imageLabel, 0, Qt::AlignHCenter);

    QLabel *lbl1 = new QLabel(this);

    lbl1->setOpenExternalLinks(true);

    lbl1->setText(

        //: %1 contains Hedgewars' version number

        "<div align=\"center\"><h1>"+QString(tr("Hedgewars %1")).arg(*cVersionString) + "</h1>"

        //: “Revision” stands for a revision in Mercurial, a distributed version control system. %1 is the revision, %2 is the hexadecimal hash.

        "<h3>" + QString(tr("Revision %1 (%2)")).arg(*cRevisionString, *cHashString) + "</h3>"

        //: %1 is replaced by the URL of Hedgewars.

        "<p>" + QString(tr("Visit our homepage: %1"))

        .arg("<a href=\"https://www.hedgewars.org/\">https://www.hedgewars.org/</a>") + "</p>" +

        //: %1 is the name of a license

        tr("This program is distributed under the %1.")

	.arg("<a href=\"https://www.gnu.org/licenses/gpl-2.0.html\">"+

        //: Short for “GNU General Public License version 2”

        tr("GNU GPL v2")+"</a>") +

        "</div>"

    );

    lbl1->setWordWrap(true);

    mainLayout->addWidget(lbl1, 0, 1);

    /* Credits */

    creditsBrowser = new QTextBrowser(this);

    creditsBrowser->setOpenExternalLinks(true);

    QString credits = getCreditsHtml();

    QString header =

        "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">"

        "<html xmlns=\"http://www.w3.org/1999/xhtml\" lang=\"en\" xml:lang=\"en\">"

        "<head>"

        "<title>Hedgewars Credits</title>"

        "<meta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\" />"

        "<style type=\"text/css\">"

        "     body { color: orange; }"

        "     a { color: #ffe270; }"

        "     a:hover { color: yellow; }"

        "     ul { list-style-type: none; }"

        "</style>"

        "</head>"

        "<body>"

        "";

    QString footer =

        ""

        "</body></html>";

    creditsBrowser->setHtml(header + credits + footer);

    mainLayout->addWidget(creditsBrowser, 1, 1);

    /* Library information */

    //: For the version numbers of Hedgewars' software dependencies

    QString libinfo = QString(tr("Dependency versions:") + QString("<br>"));

#if defined(__GNUC__)

    libinfo.append(QString(tr("<a href=\"https://gcc.gnu.org\">GCC</a>: %1")).arg(__VERSION__));

#elif defined(WIN32_VCPKG)

    libinfo.append(QString(tr("<a href=\"https://visualstudio.microsoft.com\">VC++</a>: %1")).arg(_MSC_FULL_VER));

#elif defined(__VERSION__)

    libinfo.append(QString(tr("Unknown Compiler: %1")).arg(__VERSION__));

#else

    libinfo.append(QString(tr("Unknown Compiler")));

#endif

    libinfo.append(QString("<br>"));

    const SDL_version *sdl_ver;

    SDL_version sdl_version;

    SDL_GetVersion(&sdl_version);

    sdl_ver = &sdl_version;

    libinfo.append(QString(tr("<a href=\"https://www.libsdl.org/\">SDL2</a>: %1.%2.%3"))

        .arg(sdl_ver->major)

        .arg(sdl_ver->minor)

        .arg(sdl_ver->patch));

    libinfo.append(QString("<br>"));

    const SDL_version *sdlmixer_ver = Mix_Linked_Version();

    libinfo.append(QString(tr("<a href=\"https://www.libsdl.org/\">SDL2_mixer</a>: %1.%2.%3"))

        .arg(sdlmixer_ver->major)

        .arg(sdlmixer_ver->minor)

        .arg(sdlmixer_ver->patch));

    libinfo.append(QString("<br>"));

    // the remaining sdl modules used only in engine, so instead of needlessly linking them here

    // we dynamically call the function returning the linked version

    void *sdlnet_handle = SDL_LoadObject(sopath("SDL2_net"));

    if (sdlnet_handle != NULL) {

        SDL_version *(*sdlnet_ver_get)(void) = NULL;

        sdlnet_ver_get = (SDL_version *(*)(void)) SDL_LoadFunction(sdlnet_handle, "SDLNet_Linked_Version");

        if (sdlnet_ver_get != NULL) {

            SDL_version *sdlnet_ver = sdlnet_ver_get();

            libinfo.append(QString(tr("<a href=\"https://www.libsdl.org/\">SDL2_net</a>: %1.%2.%3"))

                .arg(sdlnet_ver->major)

                .arg(sdlnet_ver->minor)

                .arg(sdlnet_ver->patch));

            libinfo.append(QString("<br>"));

        }

        SDL_UnloadObject(sdlnet_handle);

    }

    void *sdlimage_handle = SDL_LoadObject(sopath("SDL2_image"));

    if (sdlimage_handle != NULL) {

        SDL_version *(*sdlimage_ver_get)(void) = NULL;

        sdlimage_ver_get = (SDL_version *(*)(void)) SDL_LoadFunction(sdlimage_handle, "IMG_Linked_Version");

        if (sdlimage_ver_get != NULL) {

            SDL_version *sdlimage_ver = sdlimage_ver_get();

            libinfo.append(QString(tr("<a href=\"https://www.libsdl.org/\">SDL2_image</a>: %1.%2.%3"))

                .arg(sdlimage_ver->major)

                .arg(sdlimage_ver->minor)

                .arg(sdlimage_ver->patch));

            libinfo.append(QString("<br>"));

        }

        SDL_UnloadObject(sdlimage_handle);

    }

    void *sdlttf_handle = SDL_LoadObject(sopath("SDL2_ttf"));

    if (sdlttf_handle != NULL) {

        SDL_version *(*sdlttf_ver_get)(void) = NULL;

        sdlttf_ver_get = (SDL_version *(*)(void)) SDL_LoadFunction(sdlttf_handle, "TTF_Linked_Version");

        if (sdlttf_ver_get != NULL) {

            SDL_version *sdlttf_ver = sdlttf_ver_get();

            libinfo.append(QString(tr("<a href=\"https://www.libsdl.org/\">SDL2_ttf</a>: %1.%2.%3"))

                .arg(sdlttf_ver->major)

                .arg(sdlttf_ver->minor)

                .arg(sdlttf_ver->patch));

            libinfo.append(QString("<br>"));

        }

        SDL_UnloadObject(sdlttf_handle);

    }

    libinfo.append(QString(tr("<a href=\"https://www.qt.io/developers/\">Qt</a>: %1")).arg(QT_VERSION_STR));

    libinfo.append(QString("<br>"));

#ifdef VIDEOREC

    libinfo.append(QString(tr("<a href=\"https://libav.org\">libavcodec</a>: %1.%2.%3"))

        .arg(LIBAVCODEC_VERSION_MAJOR)

        .arg(LIBAVCODEC_VERSION_MINOR)

        .arg(LIBAVCODEC_VERSION_MICRO));

    libinfo.append(QString("<br>"));

    libinfo.append(QString(tr("<a href=\"https://libav.org\">libavformat</a>: %1.%2.%3"))

        .arg(LIBAVFORMAT_VERSION_MAJOR)

        .arg(LIBAVFORMAT_VERSION_MINOR)

        .arg(LIBAVFORMAT_VERSION_MICRO));

    libinfo.append(QString("<br>"));

    libinfo.append(QString(tr("<a href=\"https://libav.org\">libavutil</a>: %1.%2.%3"))

        .arg(LIBAVUTIL_VERSION_MAJOR)

        .arg(LIBAVUTIL_VERSION_MINOR)

        .arg(LIBAVUTIL_VERSION_MICRO));

    libinfo.append(QString("<br>"));

#endif

    libinfo.append(QString(tr("<a href=\"https://icculus.org/physfs/\">PhysFS</a>: %1.%2.%3"))

        .arg(PHYSFS_VER_MAJOR)

        .arg(PHYSFS_VER_MINOR)

        .arg(PHYSFS_VER_PATCH));

    libinfo.append(QString("<br>"));

    // TODO: how to add Lua information?

    QLabel * lblLibInfo = new QLabel();

    lblLibInfo->setOpenExternalLinks(true);

    lblLibInfo->setText(libinfo);

    lblLibInfo->setWordWrap(true);

    lblLibInfo->setMaximumWidth(280);

    leftLayout->addWidget(lblLibInfo, 0, Qt::AlignHCenter);

    leftLayout->addStretch(1);

    setAcceptDrops(true);

}

void About::dragEnterEvent(QDragEnterEvent * event)

{

    if (event->mimeData()->hasUrls())

    {

        QList<QUrl> urls = event->mimeData()->urls();

        QString url = urls[0].toString();

        if (urls.count() == 1)

            if (url.contains(QRegExp("^file://.*\\.ogg$")))

                event->acceptProposedAction();

    }

}

void About::dropEvent(QDropEvent * event)

{

    QString file =

        event->mimeData()->urls()[0].toString().remove(QRegExp("^file://"));

    SDLInteraction::instance().setMusicTrack(file);

    event->acceptProposedAction();

}