/* This file is part of the KDE project
   Copyright (C) 1999 David Faure <faure@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "kbugreport.h"

#include <QtCore/QProcess>
#include <QtCore/QCoreApplication>
#include <QDialogButtonBox>
#include <QPushButton>
#include <QLayout>
#include <QRadioButton>
#include <QGroupBox>
#include <QLocale>
#include <QCloseEvent>
#include <QLabel>
#include <QUrl>
#include <QUrlQuery>
#include <QDesktopServices>
#include <QComboBox>
#include <QLineEdit>
#include <QStandardPaths>
#include <QDebug>

#include <kaboutdata.h>
#include <kconfig.h>
#include <kconfiggroup.h>
#include <kemailsettings.h>
#include <klocalizedstring.h>
#include <kmessagebox.h>
#include <ktextedit.h>
#include <ktitlewidget.h>

#include "kdepackages.h"
#include "../kxmlgui_version.h"
#include "systeminformation_p.h"
#include "config-xmlgui.h"

class KBugReportPrivate
{
public:
    KBugReportPrivate(KBugReport *q): q(q), m_aboutData(KAboutData::applicationData()) {}

    enum BugDestination
    {
        BugsKdeOrg,
        CustomEmail,
        CustomUrl
    };

    void _k_slotConfigureEmail();
    void _k_slotSetFrom();
    void _k_appChanged(int);
    void _k_updateUrl();

    KBugReport *q;
    QProcess *m_process;
    KAboutData m_aboutData;

    KTextEdit *m_lineedit;
    QLineEdit *m_subject;
    QLabel *m_from;
    QLabel *m_version;
    QString m_strVersion;
    QGroupBox *m_bgSeverity;
    QPushButton *m_configureEmail;

    QComboBox *appcombo;
    QString lastError;
    QString kde_version;
    QString appname;
    QString os;
    QUrl url;
    QList<QRadioButton *> severityButtons;
    int currentSeverity()
    {
        for (int i = 0; i < severityButtons.count(); i++)
            if (severityButtons[i]->isChecked()) {
                return i;
            }
        return -1;
    }
    BugDestination bugDestination;
};

KBugReport::KBugReport(const KAboutData &aboutData, QWidget *_parent)
    : QDialog(_parent), d(new KBugReportPrivate(this))
{
    setWindowTitle(i18n("Submit Bug Report"));

    QDialogButtonBox *buttonBox = new QDialogButtonBox(this);
    buttonBox->setStandardButtons(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
    connect(buttonBox, SIGNAL(accepted()), this, SLOT(accept()));
    connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));

    d->m_aboutData = aboutData;
    d->m_process = nullptr;
    d->bugDestination = KBugReportPrivate::CustomEmail;

    const QString bugAddress = d->m_aboutData.bugAddress();
    if (bugAddress == QStringLiteral("submit@bugs.kde.org")) {
        // This is a core KDE application -> redirect to the web form
        d->bugDestination = KBugReportPrivate::BugsKdeOrg;
    } else if (!QUrl(bugAddress).scheme().isEmpty()) {
        // The bug reporting address is a URL -> redirect to that
        d->bugDestination = KBugReportPrivate::CustomUrl;
    }

    if (d->bugDestination != KBugReportPrivate::CustomEmail) {
        KGuiItem::assign(buttonBox->button(QDialogButtonBox::Cancel), KStandardGuiItem::close());
    }

    QLabel *tmpLabel;
    QVBoxLayout *lay = new QVBoxLayout;
    setLayout(lay);

    KTitleWidget *title = new KTitleWidget(this);
    title->setText(i18n("Submit Bug Report"));
    title->setPixmap(QIcon::fromTheme(QStringLiteral("tools-report-bug")).pixmap(32));
    lay->addWidget(title);

    QGridLayout *glay = new QGridLayout();
    lay->addLayout(glay);

    int row = 0;

    if (d->bugDestination == KBugReportPrivate::CustomEmail) {
        // From
        QString qwtstr = i18n("Your email address. If incorrect, use the Configure Email button to change it");
        tmpLabel = new QLabel(i18nc("Email sender address", "From:"), this);
        glay->addWidget(tmpLabel, row, 0);
        tmpLabel->setWhatsThis(qwtstr);
        d->m_from = new QLabel(this);
        glay->addWidget(d->m_from, row, 1);
        d->m_from->setWhatsThis(qwtstr);

        // Configure email button
        d->m_configureEmail = new QPushButton(i18n("Configure Email..."),
                                              this);
        connect(d->m_configureEmail, SIGNAL(clicked()), this,
                SLOT(_k_slotConfigureEmail()));
        glay->addWidget(d->m_configureEmail, 0, 2, 3, 1, Qt::AlignTop | Qt::AlignRight);

        // To
        qwtstr = i18n("The email address this bug report is sent to.");
        tmpLabel = new QLabel(i18nc("Email receiver address", "To:"), this);
        glay->addWidget(tmpLabel, ++row, 0);
        tmpLabel->setWhatsThis(qwtstr);
        tmpLabel = new QLabel(d->m_aboutData.bugAddress(), this);
        tmpLabel->setTextInteractionFlags(Qt::TextBrowserInteraction);
        glay->addWidget(tmpLabel, row, 1);
        tmpLabel->setWhatsThis(qwtstr);

        KGuiItem::assign(buttonBox->button(QDialogButtonBox::Ok),
                         KGuiItem(i18n("&Send"), QStringLiteral("mail-send"), i18n("Send bug report."),
                                  i18n("Send this bug report to %1.", d->m_aboutData.bugAddress())));
        row++;
    } else {
        d->m_configureEmail = nullptr;
        d->m_from = nullptr;
    }

    // Program name
    QString qwtstr = i18n("The application for which you wish to submit a bug report - if incorrect, please use the Report Bug menu item of the correct application");
    tmpLabel = new QLabel(i18n("Application: "), this);
    glay->addWidget(tmpLabel, row, 0);
    tmpLabel->setWhatsThis(qwtstr);
    d->appcombo = new QComboBox(this);
    d->appcombo->setWhatsThis(qwtstr);
    QStringList packageList;
    for (int c = 0; packages[c]; ++c) {
        packageList << QString::fromLatin1(packages[c]);
    }
    d->appcombo->addItems(packageList);
    connect(d->appcombo, SIGNAL(activated(int)), SLOT(_k_appChanged(int)));
    d->appname = d->m_aboutData.productName();
    glay->addWidget(d->appcombo, row, 1);
    int index = 0;
    for (; index < d->appcombo->count(); index++) {
        if (d->appcombo->itemText(index) == d->appname) {
            break;
        }
    }
    if (index == d->appcombo->count()) { // not present
        d->appcombo->addItem(d->appname);
    }
    d->appcombo->setCurrentIndex(index);

    tmpLabel->setWhatsThis(qwtstr);

    // Version
    qwtstr = i18n("The version of this application - please make sure that no newer version is available before sending a bug report");
    tmpLabel = new QLabel(i18n("Version:"), this);
    glay->addWidget(tmpLabel, ++row, 0);
    tmpLabel->setWhatsThis(qwtstr);
    d->m_strVersion = d->m_aboutData.version();
    if (d->m_strVersion.isEmpty()) {
        d->m_strVersion = i18n("no version set (programmer error)");
    }
    d->kde_version = QStringLiteral(KXMLGUI_VERSION_STRING);
    d->kde_version += QStringLiteral(", ") + QLatin1String(XMLGUI_DISTRIBUTION_TEXT);
    if (d->bugDestination != KBugReportPrivate::BugsKdeOrg) {
        d->m_strVersion += QLatin1Char(' ') + d->kde_version;
    }
    d->m_version = new QLabel(d->m_strVersion, this);
    d->m_version->setTextInteractionFlags(Qt::TextBrowserInteraction);
    //glay->addWidget( d->m_version, row, 1 );
    glay->addWidget(d->m_version, row, 1, 1, 2);
    d->m_version->setWhatsThis(qwtstr);

    tmpLabel = new QLabel(i18n("OS:"), this);
    glay->addWidget(tmpLabel, ++row, 0);
    d->os = SystemInformation::operatingSystemVersion();

    tmpLabel = new QLabel(d->os, this);
    tmpLabel->setTextInteractionFlags(Qt::TextBrowserInteraction);
    glay->addWidget(tmpLabel, row, 1, 1, 2);

    tmpLabel = new QLabel(i18n("Compiler:"), this);
    glay->addWidget(tmpLabel, ++row, 0);
    tmpLabel = new QLabel(QLatin1String(XMLGUI_COMPILER_VERSION), this);
    tmpLabel->setTextInteractionFlags(Qt::TextBrowserInteraction);
    glay->addWidget(tmpLabel, row, 1, 1, 2);

    if (d->bugDestination == KBugReportPrivate::CustomEmail) {
        // Severity
        d->m_bgSeverity = new QGroupBox(i18n("Se&verity"), this);
        static const char *const sevNames[5] = { "critical", "grave", "normal", "wishlist", "i18n" };
        const QString sevTexts[5] = { i18n("Critical"), i18n("Grave"), i18nc("normal severity", "Normal"), i18n("Wishlist"), i18n("Translation") };
        QHBoxLayout *severityLayout = new QHBoxLayout(d->m_bgSeverity);
        for (int i = 0; i < 5; i++) {
            // Store the severity string as the name
            QRadioButton *rb = new QRadioButton(sevTexts[i], d->m_bgSeverity);
            rb->setObjectName(QLatin1String(sevNames[i]));
            d->severityButtons.append(rb);
            severityLayout->addWidget(rb);
            if (i == 2) {
                rb->setChecked(true);    // default : "normal"
            }
        }

        lay->addWidget(d->m_bgSeverity);

        // Subject
        QHBoxLayout *hlay = new QHBoxLayout();
        lay->addItem(hlay);
        tmpLabel = new QLabel(i18n("S&ubject: "), this);
        hlay->addWidget(tmpLabel);
        d->m_subject = new QLineEdit(this);
        d->m_subject->setClearButtonEnabled(true);
        d->m_subject->setFocus();
        tmpLabel->setBuddy(d->m_subject);
        hlay->addWidget(d->m_subject);

        QString text = i18n("Enter the text (in English if possible) that you wish to submit for the "
                            "bug report.\n"
                            "If you press \"Send\", a mail message will be sent to the maintainer of "
                            "this program.\n");
        QLabel *label = new QLabel(this);

        label->setText(text);
        lay->addWidget(label);

        // The multiline-edit
        d->m_lineedit = new KTextEdit(this);
        d->m_lineedit->setMinimumHeight(180);   // make it big
        d->m_lineedit->setWordWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
        d->m_lineedit->setLineWrapMode(QTextEdit::WidgetWidth);
        d->m_lineedit->setCheckSpellingEnabled(true);
        d->m_lineedit->setSpellCheckingLanguage(QStringLiteral("en"));
        lay->addWidget(d->m_lineedit, 10 /*stretch*/);

        d->_k_slotSetFrom();
    } else {
        // Point to the web form

        QString text;
        if (d->bugDestination == KBugReportPrivate::BugsKdeOrg) {
            text = i18n("<qt>To submit a bug report, click on the button below. This will open a web browser "
                        "window on <a href=\"http://bugs.kde.org\">http://bugs.kde.org</a> where you will find "
                        "a form to fill in. The information displayed above will be transferred to that server.</qt>");
            d->_k_updateUrl();
        } else {
            text = i18n("<qt>To submit a bug report, click on the button below. This will open a web browser "
                        "window on <a href=\"%1\">%2</a>.</qt>", bugAddress, bugAddress);
            d->url = QUrl(bugAddress);
        }

        lay->addSpacing(10);
        QLabel *label = new QLabel(text, this);
        label->setOpenExternalLinks(true);
        label->setTextInteractionFlags(Qt::LinksAccessibleByMouse | Qt::LinksAccessibleByKeyboard);
        label->setWordWrap(true);
        lay->addWidget(label);
        lay->addSpacing(10);

        d->appcombo->setFocus();

        QPushButton *okButton = buttonBox->button(QDialogButtonBox::Ok);
        if (d->bugDestination == KBugReportPrivate::BugsKdeOrg) {
            okButton->setText(i18n("&Launch Bug Report Wizard"));
        } else {
            okButton->setText(i18n("&Submit Bug Report"));
        }
        okButton->setIcon(QIcon::fromTheme(QStringLiteral("tools-report-bug")));
    }

    lay->addWidget(buttonBox);
    setMinimumHeight(sizeHint().height() + 20);   // WORKAROUND: prevent "cropped" qcombobox
}

KBugReport::~KBugReport()
{
    delete d;
}

QString KBugReport::messageBody() const
{
    if (d->bugDestination == KBugReportPrivate::CustomEmail) {
        return d->m_lineedit->toPlainText();
    } else {
        return QString();
    }
}

void KBugReport::setMessageBody(const QString &messageBody)
{
    if (d->bugDestination == KBugReportPrivate::CustomEmail) {
        d->m_lineedit->setPlainText(messageBody);
    }
}

void KBugReportPrivate::_k_updateUrl()
{
    url = QUrl(QStringLiteral("https://bugs.kde.org/enter_bug.cgi"));
    QUrlQuery query;
    query.addQueryItem(QStringLiteral("format"), QStringLiteral("guided"));    // use the guided form

    // the string format is product/component, where component is optional
    QStringList list = appcombo->currentText().split(QLatin1Char('/'));
    query.addQueryItem(QStringLiteral("product"), list[0]);
    if (list.size() == 2) {
        query.addQueryItem(QStringLiteral("component"), list[1]);
    }

    query.addQueryItem(QStringLiteral("version"), m_strVersion);
    url.setQuery(query);

    // TODO: guess and fill OS(sys_os) and Platform(rep_platform) fields
}

void KBugReportPrivate::_k_appChanged(int i)
{
    QString appName = appcombo->itemText(i);
    int index = appName.indexOf(QLatin1Char('/'));
    if (index > 0) {
        appName = appName.left(index);
    }
    //qDebug() << "appName " << appName;

    QString strDisplayVersion; //Version string to show in the UI
    if (appname == appName && !m_aboutData.version().isEmpty()) {
        m_strVersion = m_aboutData.version();
        strDisplayVersion = m_strVersion;
    } else {
        m_strVersion = QStringLiteral("unknown"); //English string to put in the bug report
        strDisplayVersion = i18nc("unknown program name", "unknown");
    }

    if (bugDestination != KBugReportPrivate::BugsKdeOrg) {
        m_strVersion += QLatin1Char(' ') + kde_version;
        strDisplayVersion += QLatin1Char(' ') + kde_version;
    }

    m_version->setText(strDisplayVersion);
    if (bugDestination == KBugReportPrivate::BugsKdeOrg) {
        _k_updateUrl();
    }
}

void KBugReportPrivate::_k_slotConfigureEmail()
{
    if (m_process) {
        return;
    }
    m_process = new QProcess;
    QObject::connect(m_process, SIGNAL(finished(int,QProcess::ExitStatus)), q, SLOT(_k_slotSetFrom()));
    m_process->start(QStringLiteral("kcmshell5"), QStringList() << QStringLiteral("user_manager"));
    if (!m_process->waitForStarted()) {
        //qDebug() << "Couldn't start kcmshell5..";
        delete m_process;
        m_process = nullptr;
        return;
    }
    m_configureEmail->setEnabled(false);
}

void KBugReportPrivate::_k_slotSetFrom()
{
    delete m_process;
    m_process = nullptr;
    m_configureEmail->setEnabled(true);

    KEMailSettings emailSettings;
    QString fromaddr = emailSettings.getSetting(KEMailSettings::EmailAddress);
    if (fromaddr.isEmpty()) {
        fromaddr = SystemInformation::userName();
    } else {
        QString name = emailSettings.getSetting(KEMailSettings::RealName);
        if (!name.isEmpty()) {
            fromaddr = name + QLatin1String(" <") + fromaddr + QLatin1String(">");
        }
    }
    m_from->setText(fromaddr);
}

void KBugReport::accept()
{
    if (d->bugDestination != KBugReportPrivate::CustomEmail) {
        QDesktopServices::openUrl(d->url);
        return;
    }

    if (d->m_lineedit->toPlainText().isEmpty() ||
            d->m_subject->text().isEmpty()) {
        QString msg = i18n("You must specify both a subject and a description "
                           "before the report can be sent.");
        KMessageBox::error(this, msg);
        return;
    }

    switch (d->currentSeverity()) {
    case 0: // critical
        if (KMessageBox::questionYesNo(this, i18n(
                                           "<p>You chose the severity <b>Critical</b>. "
                                           "Please note that this severity is intended only for bugs that:</p>"
                                           "<ul><li>break unrelated software on the system (or the whole system)</li>"
                                           "<li>cause serious data loss</li>"
                                           "<li>introduce a security hole on the system where the affected package is installed</li></ul>\n"
                                           "<p>Does the bug you are reporting cause any of the above damage? "
                                           "If it does not, please select a lower severity. Thank you.</p>"), QString(), KStandardGuiItem::cont(), KStandardGuiItem::cancel()) == KMessageBox::No) {
            return;
        }
        break;
    case 1: // grave
        if (KMessageBox::questionYesNo(this, i18n(
                                           "<p>You chose the severity <b>Grave</b>. "
                                           "Please note that this severity is intended only for bugs that:</p>"
                                           "<ul><li>make the package in question unusable or mostly so</li>"
                                           "<li>cause data loss</li>"
                                           "<li>introduce a security hole allowing access to the accounts of users who use the affected package</li></ul>\n"
                                           "<p>Does the bug you are reporting cause any of the above damage? "
                                           "If it does not, please select a lower severity. Thank you.</p>"), QString(), KStandardGuiItem::cont(), KStandardGuiItem::cancel()) == KMessageBox::No) {
            return;
        }
        break;
    default:
        break;
    }
    if (!sendBugReport()) {
        QString msg = i18n("Unable to send the bug report.\n"
                           "Please submit a bug report manually....\n"
                           "See http://bugs.kde.org/ for instructions.");
        KMessageBox::error(this, msg + QStringLiteral("\n\n") + d->lastError);
        return;
    }

    KMessageBox::information(this,
                             i18n("Bug report sent, thank you for your input."));
    QDialog::accept();
}

void KBugReport::closeEvent(QCloseEvent *e)
{
    if (d->bugDestination == KBugReportPrivate::CustomEmail &&
        ((d->m_lineedit->toPlainText().length() > 0) || d->m_subject->isModified())) {
        int rc = KMessageBox::warningYesNo(this,
                                           i18n("Close and discard\nedited message?"),
                                           i18n("Close Message"), KStandardGuiItem::discard(), KStandardGuiItem::cont());
        if (rc == KMessageBox::No) {
            e->ignore();
            return;
        }
    }
    QDialog::closeEvent(e);
}

QString KBugReport::text() const
{
    //qDebug() << d->severityButtons[d->currentSeverity()]->objectName();
    // Prepend the pseudo-headers to the contents of the mail
    QString severity = d->severityButtons[d->currentSeverity()]->objectName();
    QString appname = d->appcombo->currentText();
    QString os = QStringLiteral("OS: %1 (%2)\n").
                 arg(QStringLiteral(XMLGUI_COMPILING_OS),
                     QStringLiteral(XMLGUI_DISTRIBUTION_TEXT));
    QString bodyText;
    /*  for(int i = 0; i < m_lineedit->numLines(); i++)
      {
         QString line = m_lineedit->textLine(i);
         if (!line.endsWith("\n"))
            line += '\n';
         bodyText += line;
      }
    */
    bodyText = d->m_lineedit->toPlainText();
    if (bodyText.length() > 0)
        if (bodyText[bodyText.length() - 1] != QLatin1Char('\n')) {
            bodyText += QLatin1Char('\n');
        }
    if (severity == QStringLiteral("i18n") && QLocale().language() != QLocale::system().language()) {
        // Case 1 : i18n bug
        QString package = QStringLiteral("i18n_%1").arg(QLocale::languageToString(QLocale().language()));
        package = package.replace(QLatin1Char('_'), QLatin1Char('-'));
        return QStringLiteral("Package: %1").arg(package) +
               QStringLiteral("\nApplication: %1\nVersion: %2\n").arg(appname, d->m_strVersion) +
                                   // not really i18n's version, so better here IMHO
                                   os + QLatin1String("\n") + bodyText;
    } else {
        appname = appname.replace(QLatin1Char('_'), QLatin1Char('-'));
        // Case 2 : normal bug
        return QStringLiteral("Package: %1\nVersion: %2\nSeverity: %3\n")
               .arg(appname, d->m_strVersion, severity) +
               QStringLiteral("Compiler: %1\n").arg(QStringLiteral(XMLGUI_COMPILER_VERSION)) +
               os + QLatin1String("\n") + bodyText;
    }
}

bool KBugReport::sendBugReport()
{
    QString recipient = d->m_aboutData.bugAddress();
    if (recipient.isEmpty()) {
        recipient = QStringLiteral("submit@bugs.kde.org");
    }

    QString command = QStandardPaths::findExecutable(QStringLiteral("ksendbugmail"));
    if (command.isEmpty()) {
        command = QFile::decodeName(CMAKE_INSTALL_PREFIX "/" KF5_LIBEXEC_INSTALL_DIR "/ksendbugmail");
    }

    QProcess proc;
    QStringList args;
    args << QStringLiteral("--subject") << d->m_subject->text() << QStringLiteral("--recipient") << recipient;
    proc.start(command, args);
    //qDebug() << command << args;
    if (!proc.waitForStarted()) {
        qCritical() << "Unable to open a pipe to " << command << endl;
        return false;
    }
    proc.write(text().toUtf8());
    proc.closeWriteChannel();

    proc.waitForFinished();
    //qDebug() << "kbugreport: sendbugmail exit, status " << proc.exitStatus() << " code " << proc.exitCode();

    QByteArray line;
    if (proc.exitStatus() == QProcess::NormalExit && proc.exitCode() != 0) {
        // XXX not stderr?
        while (!proc.atEnd()) {
            line = proc.readLine();
        }
        d->lastError = QString::fromUtf8(line);
        return false;
    }
    return true;
}

#include "moc_kbugreport.cpp"
