/*
 * 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 <QHBoxLayout>
#include <QLineEdit>
#include <QTextBrowser>
#include <QLabel>
#include <QNetworkAccessManager>
#include <QSysInfo>
#include <QDebug>
#include <QBuffer>
#include <QApplication>
#include <QDesktopWidget>
#include <QNetworkReply>
#include <QProcess>
#include <QMessageBox>
#include <QCheckBox>
#include <QByteArray>

#include <string>

#ifdef Q_OS_WIN
#ifndef WINVER
#define WINVER 0x0500
#endif
#include <windows.h>
#else
#include <unistd.h>
#include <sys/types.h>
#endif

#ifdef Q_OS_MAC
#include <sys/sysctl.h>
#ifndef _SC_NPROCESSORS_ONLN
#define _SC_NPROCESSORS_ONLN 58
#endif
#endif

#include <stdint.h>

#include "AbstractPage.h"
#include "hwconsts.h"
#include "feedbackdialog.h"

FeedbackDialog::FeedbackDialog(QWidget * parent) : QDialog(parent)
{
    setModal(true);
    setWindowFlags(Qt::Sheet);
    setWindowModality(Qt::WindowModal);
    setWindowTitle(tr("Feedback"));
    resize(700, 460);
    setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);

    netManager = NULL;
    GenerateSpecs();

    /* Top layout */

    QVBoxLayout * pageLayout = new QVBoxLayout();
    QGridLayout * feedbackLayout = new QGridLayout();

    setStyleSheet("QPushButton { padding: 5px }");

    info = new QLabel();
    info->setText(QString(
        "<style type=\"text/css\">"
        "a { color: #fc0; }"
        "b { color: #0df; }"
        "</style>"
        "<div align=\"center\"><h1>%1</h1>"
        "<h3>%2<h3>"
        "<h4>%3 <a href=\"https://hedgewars.org/kb/KnownBugs\">known bugs</a><h4>"
        "<h4>%4<h4>"
        "</div>")
        .arg(tr("Send us feedback!"))
        .arg(tr("We are always happy about suggestions, ideas, or bug reports."))
        .arg(tr("If you found a bug, you can see if it's already been reported here: "))
        .arg(tr("Your email address is optional, but necessary if you want us to get back at you."))
    );
    info->setOpenExternalLinks(true);
    pageLayout->addWidget(info);

    label_email = new QLabel();
    label_email->setText(QLabel::tr("Your Email"));
    email = new QLineEdit();
    feedbackLayout->addWidget(label_email, 0, 0);
    feedbackLayout->addWidget(email, 0, 1);

    label_summary = new QLabel();
    label_summary->setText(QLabel::tr("Summary"));
    summary = new QLineEdit();
    feedbackLayout->addWidget(label_summary, 1, 0);
    feedbackLayout->addWidget(summary, 1, 1);

    CheckSendSpecs = new QCheckBox();
    CheckSendSpecs->setText(QLabel::tr("Send system information"));
    CheckSendSpecs->setChecked(false);
    CheckSendSpecs->setToolTip(tr("This is optional, but this information might help us to resolve bugs and other technical problems."));
    BtnViewInfo = new QPushButton(tr("View"));
    BtnViewInfo->setFixedHeight(40);
    feedbackLayout->addWidget(CheckSendSpecs, 0, 2, 2, 1);
    feedbackLayout->addWidget(BtnViewInfo, 0, 3, 2, 1);
    connect(BtnViewInfo, SIGNAL(clicked()), this, SLOT(ShowSpecs()));


    label_description = new QLabel();
    label_description->setText(QLabel::tr("Description"));
    description = new QTextBrowser();
    description->setReadOnly(false);
    feedbackLayout->addWidget(label_description, 2, 0);
    feedbackLayout->addWidget(description, 2, 1, 1, 3);

    /* Bottom layout */

    QHBoxLayout * captchaLayout = new QHBoxLayout();
    QVBoxLayout * captchaInputLayout = new QVBoxLayout();

    QPushButton * BtnCancel = new QPushButton(tr("Cancel"));
    feedbackLayout->addWidget(BtnCancel, 3, 0);
    BtnCancel->setFixedHeight(40);
    connect(BtnCancel, SIGNAL(clicked()), this, SLOT(reject()));

    label_captcha = new QLabel();
    label_captcha->setStyleSheet("border: 3px solid #ffcc00; border-radius: 4px");
    label_captcha->setText(QLabel::tr("Loading<br>CAPTCHA ..."));
    label_captcha->setFixedSize(200, 50);
    captchaLayout->addWidget(label_captcha);

    label_captcha_input = new QLabel();
    label_captcha_input->setText(QLabel::tr("Type the security code:"));
    captchaInputLayout->addWidget(label_captcha_input);
    captchaInputLayout->setAlignment(label_captcha, Qt::AlignBottom);
    captcha_code = new QLineEdit();
    captcha_code->setFixedHeight(30);
    captchaInputLayout->addWidget(captcha_code);
    captchaInputLayout->setAlignment(captcha_code, Qt::AlignTop);
    captchaLayout->addLayout(captchaInputLayout);
    captchaLayout->setAlignment(captchaInputLayout, Qt::AlignLeft);

    QWidget * captchaLayoutWidget = new QWidget();
    captchaLayoutWidget->setContentsMargins(0, 0, 0, 0);
    captchaLayoutWidget->setLayout(captchaLayout);
    feedbackLayout->addWidget(captchaLayoutWidget, 3, 1, 1, 2);

    BtnSend = new QPushButton(tr("Send Feedback"));
    BtnSend->setStyleSheet("qproperty-icon: url(:/res/Start.png);");

    feedbackLayout->addWidget(BtnSend, 3, 3);
    BtnSend->setFixedHeight(40);
    connect(BtnSend, SIGNAL(clicked()), this, SLOT(SendFeedback()));

    pageLayout->addLayout(feedbackLayout);

    QVBoxLayout * dialogLayout = new QVBoxLayout(this);
    dialogLayout->addLayout(pageLayout, 1);

    LoadCaptchaImage();
}

void FeedbackDialog::GenerateSpecs()
{
    // Gather some information about the system and embed it into the report
    QDesktopWidget* screen = QApplication::desktop();
    QString os_version = "Operating system: ";
    QString qt_version = QString("Qt version: ") + QT_VERSION_STR + QString("\n");
    QString total_ram = "Total RAM: ";
    QString number_of_cores = "Number of cores: ";
    QString compiler_bits = "Compiler architecture: ";
    QString compiler_version = "Compiler version: ";
    QString kernel_line = "Kernel: ";
    QString screen_size = "Size of the screen(s): " +
        QString::number(screen->width()) + "x" + QString::number(screen->height()) + "\n";
    QString number_of_screens = "Number of screens: " + QString::number(screen->screenCount()) + "\n";
    QString processor_name = "Processor: ";

    // platform specific code
#ifdef Q_OS_MACX
    number_of_cores += QString::number(sysconf(_SC_NPROCESSORS_ONLN)) + "\n";

    uint64_t memsize;
    size_t len = sizeof(memsize);
    static int mib_s[2] = { CTL_HW, HW_MEMSIZE };
    if (sysctl (mib_s, 2, &memsize, &len, NULL, 0) == 0)
        total_ram += QString::number(memsize/1024/1024) + " MB\n";
    else
        total_ram += "Error getting total RAM information\n";

    int mib[] = {CTL_KERN, KERN_OSRELEASE};
    sysctl(mib, sizeof mib / sizeof(int), NULL, &len, NULL, 0);

    char *kernelVersion = (char *)malloc(sizeof(char)*len);
    sysctl(mib, sizeof mib / sizeof(int), kernelVersion, &len, NULL, 0);

    QString kernelVersionStr = QString(kernelVersion);
    free(kernelVersion);
    int major_version = kernelVersionStr.split(".").first().toUInt() - 4;
    int minor_version = kernelVersionStr.split(".").at(1).toUInt();
    os_version += QString("Mac OS X 10.%1.%2").arg(major_version).arg(minor_version) + " ";

    switch(major_version)
    {
        case 4:  os_version += "\"Tiger\"\n"; break;
        case 5:  os_version += "\"Leopard\"\n"; break;
        case 6:  os_version += "\"Snow Leopard\"\n"; break;
        case 7:  os_version += "\"Lion\"\n"; break;
        case 8:  os_version += "\"Mountain Lion\"\n"; break;
        default: os_version += "\"Unknown version\"\n"; break;
    }
#endif
#ifdef Q_OS_WIN
    SYSTEM_INFO sysinfo;
    GetSystemInfo(&sysinfo);
    number_of_cores += QString::number(sysinfo.dwNumberOfProcessors) + "\n";
    MEMORYSTATUSEX status;
    status.dwLength = sizeof(status);
    GlobalMemoryStatusEx(&status);
    total_ram += QString::number(status.ullTotalPhys/1024/1024) + " MB\n";

    switch(QSysInfo::windowsVersion())
    {
        case QSysInfo::WV_NT: os_version += "Windows NT\n"; break;
        case QSysInfo::WV_2000: os_version += "Windows 2000\n"; break;
        case QSysInfo::WV_XP: os_version += "Windows XP\n"; break;
        case QSysInfo::WV_2003: os_version += "Windows Server 2003\n"; break;
        case QSysInfo::WV_VISTA: os_version += "Windows Vista\n"; break;
        case QSysInfo::WV_WINDOWS7: os_version += "Windows 7\n"; break;
#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
        case QSysInfo::WV_WINDOWS8: os_version += "Windows 8\n"; break;
#endif
        default: os_version += "Windows (Unknown version)\n"; break;
    }
    kernel_line += "Windows kernel\n";
#endif
#ifdef Q_OS_LINUX
    number_of_cores += QString::number(sysconf(_SC_NPROCESSORS_ONLN)) + "\n";
    quint32 pages = sysconf(_SC_PHYS_PAGES);
    quint32 page_size = sysconf(_SC_PAGE_SIZE);
    quint64 total = (quint64)pages * page_size / 1024 / 1024;
    total_ram += QString::number(total) + " MB\n";
    os_version += "GNU/Linux or BSD\n";
#endif

    // uname -a
#if defined(Q_OS_LINUX) || defined(Q_OS_MAC)
    QProcess *process = new QProcess();
    QStringList arguments = QStringList("-a");
    process->start("uname", arguments);
    if (process->waitForFinished())
        kernel_line += QString(process->readAll());
    delete process;
#endif

#if (defined(Q_OS_WIN) && defined(__i386__)) || defined(__x86_64__)
    // cpu info
    quint32 registers[4];
    quint32 i;

    i = 0x80000002;
    asm volatile
      ("cpuid" : "=a" (registers[0]), "=b" (registers[1]), "=c" (registers[2]), "=d" (registers[3])
       : "a" (i), "c" (0));
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[0]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[1]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[2]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[3]), 4);
    i = 0x80000003;
    asm volatile
      ("cpuid" : "=a" (registers[0]), "=b" (registers[1]), "=c" (registers[2]), "=d" (registers[3])
       : "a" (i), "c" (0));
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[0]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[1]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[2]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[3]), 4);
    i = 0x80000004;
    asm volatile
      ("cpuid" : "=a" (registers[0]), "=b" (registers[1]), "=c" (registers[2]), "=d" (registers[3])
       : "a" (i), "c" (0));
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[0]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[1]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[2]), 4);
    processor_name += QByteArray(reinterpret_cast<char*>(&registers[3]), 4);
    processor_name += "\n";
#else
    processor_name += "Unknown";
#endif

    // compiler
#ifdef __GNUC__
    compiler_version += "GCC " + QString(__VERSION__) + "\n";
#else
    compiler_version += "Unknown\n";
#endif

    if(sizeof(void*) == 4)
        compiler_bits += "i386\n";
    else if(sizeof(void*) == 8)
        compiler_bits += "x86_64\n";

    // concat system info
    specs = qt_version
        + os_version
        + total_ram
        + screen_size
        + number_of_screens
        + processor_name
        + number_of_cores
        + compiler_version
        + compiler_bits
        + kernel_line;
}

void FeedbackDialog::ShowErrorMessage(const QString & msg)
{
    QMessageBox msgMsg(this);
    msgMsg.setIcon(QMessageBox::Warning);
    msgMsg.setWindowTitle(QMessageBox::tr("Hedgewars - Error"));
    msgMsg.setText(msg);
    msgMsg.setTextFormat(Qt::PlainText);
    msgMsg.setWindowModality(Qt::WindowModal);
    msgMsg.exec();
}

void FeedbackDialog::ShowSpecs()
{
    QMessageBox msgMsg(this);
    msgMsg.setIcon(QMessageBox::Information);
    msgMsg.setWindowTitle(QMessageBox::tr("System Information Preview"));
    msgMsg.setText(specs);
    msgMsg.setTextFormat(Qt::PlainText);
    msgMsg.setWindowModality(Qt::WindowModal);
    msgMsg.setStyleSheet("background: #0A0533;");
    msgMsg.exec();
}

void FeedbackDialog::NetReply(QNetworkReply *reply)
{
    if (reply == genCaptchaRequest)
    {
        if (reply->error() != QNetworkReply::NoError)
        {
            qDebug() << "Error generating captcha image: " << reply->errorString();
            ShowErrorMessage(QMessageBox::tr("Failed to generate captcha"));
            return;
        }

        bool okay;
        QByteArray body = reply->readAll();
        captchaID = QString(body).toInt(&okay);

        if (!okay)
        {
            qDebug() << "Failed to get captcha ID: " << body;
            ShowErrorMessage(QMessageBox::tr("Failed to generate captcha"));
            return;
        }

        QString url = "https://hedgewars.org/feedback/?captcha&id=";
        url += QString::number(captchaID);

        QNetworkAccessManager *netManager = GetNetManager();
        QUrl captchaURL(url);
        QNetworkRequest req(captchaURL);
        captchaImageRequest = netManager->get(req);
    }
    else if (reply == captchaImageRequest)
    {
        if (reply->error() != QNetworkReply::NoError)
        {
            qDebug() << "Error loading captcha image: " << reply->errorString();
            ShowErrorMessage(QMessageBox::tr("Failed to download captcha"));
            return;
        }

        QByteArray imageData = reply->readAll();
        QPixmap pixmap;
        pixmap.loadFromData(imageData);
        label_captcha->setPixmap(pixmap);
        captcha_code->setText("");
    }
}

QNetworkAccessManager * FeedbackDialog::GetNetManager()
{
    if (netManager) return netManager;
    netManager = new QNetworkAccessManager(this);
    connect(netManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(NetReply(QNetworkReply*)));
    return netManager;
}

void FeedbackDialog::LoadCaptchaImage()
{
        QNetworkAccessManager *netManager = GetNetManager();
        QUrl captchaURL("https://hedgewars.org/feedback/?gencaptcha");
        QNetworkRequest req(captchaURL);
        genCaptchaRequest = netManager->get(req);
}

void FeedbackDialog::finishedSlot(QNetworkReply* reply)
{
    if (reply->error() == QNetworkReply::NoError)
    {
            QMessageBox infoMsg(this);
            infoMsg.setIcon(QMessageBox::Information);
            infoMsg.setWindowTitle(QMessageBox::tr("Hedgewars - Success"));
            infoMsg.setText(reply->readAll());
            infoMsg.setTextFormat(Qt::PlainText);
            infoMsg.setWindowModality(Qt::WindowModal);
            infoMsg.exec();

            accept();

            return;
    }
    else
    {
        ShowErrorMessage(QString("Error: ") + reply->readAll());
        LoadCaptchaImage();
    }
}

void FeedbackDialog::SendFeedback()
{
    // Get form data

    QString summary = this->summary->text();
    QString description = this->description->toPlainText();
    QString email = this->email->text();
    QString captchaCode = this->captcha_code->text();
    QString captchaID = QString::number(this->captchaID);
    QString version = "HedgewarsFoundation-Hedgewars-v" + *cVersionString + "_r" +
                       *cRevisionString + "|" + *cHashString;

    if (summary.isEmpty() || description.isEmpty())
    {
        ShowErrorMessage(QMessageBox::tr("Please fill out all fields. Email is optional."));
        return;
    }

    // Submit issue to PHP script

    QByteArray body;
    body.append("captcha=");
    body.append(captchaID);
    body.append("&code=");
    body.append(captchaCode);
    body.append("&version=");
    body.append(QUrl::toPercentEncoding(version));
    body.append("&title=");
    body.append(QUrl::toPercentEncoding(summary));
    body.append("&body=");
    body.append(QUrl::toPercentEncoding(description));
    body.append("&email=");
    body.append(QUrl::toPercentEncoding(email));
    if (CheckSendSpecs->isChecked())
    {
        body.append("&specs=");
        body.append(QUrl::toPercentEncoding(specs));
    }

    nam = new QNetworkAccessManager(this);
    connect(nam, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(finishedSlot(QNetworkReply*)));

    QNetworkRequest header(QUrl("https://hedgewars.org/feedback/?submit"));
    header.setRawHeader("Content-Length", QString::number(body.size()).toLatin1());
    header.setRawHeader("Content-Type", "application/x-www-form-urlencoded");

    nam->post(header, body);
}