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/*
 * horizonwizard.cc - Implementation of the main Wizard class
 * horizon-qt5, the Qt 5 user interface for
 * Project Horizon
 *
 * Copyright (c) 2019 Adélie Linux and contributors.  All rights reserved.
 * This code is licensed under the AGPL 3.0 license, as noted in the
 * LICENSE-code file in the root directory of this repository.
 *
 * SPDX-License-Identifier: AGPL-3.0-only
 */

#include "horizonwizard.hh"
#include "horizonhelpwindow.hh"

#include <QDebug>
#include <QFile>
#include <QMessageBox>
#include <map>
#include <string>

#ifdef HAS_INSTALL_ENV
#   include <libudev.h>
#   include <net/if.h>      /* ifreq */
extern "C" {
#   include <skalibs/tai.h> /* STAMP */
}
#   include <sys/ioctl.h>   /* ioctl */
#   include <unistd.h>      /* close */
#endif  /* HAS_INSTALL_ENV */

#include "intropage.hh"
#include "inputpage.hh"
#ifdef NON_LIBRE_FIRMWARE
#include "firmwarepage.hh"
#endif  /* NON_LIBRE_FIRMWARE */
#include "networkingpage.hh"
#include "networkifacepage.hh"
#include "netsimplewifipage.hh"
#include "netdhcppage.hh"
#include "datetimepage.hh"
#include "hostnamepage.hh"
#include "pkgsimple.hh"
#include "bootpage.hh"

static std::map<int, std::string> help_id_map = {
    {HorizonWizard::Page_Intro, "intro"},
    {HorizonWizard::Page_Input, "input"},
    {HorizonWizard::Page_Partition, "partition"},
#ifdef NON_LIBRE_FIRMWARE
    {HorizonWizard::Page_Firmware, "firmware"},
#endif  /* NON_LIBRE_FIRMWARE */
#ifndef HAS_INSTALL_ENV
    {HorizonWizard::Page_Network_Define, "network-define"},
#endif  /* !HAS_INSTALL_ENV */
    {HorizonWizard::Page_Network, "network-start"},
    {HorizonWizard::Page_Network_Iface, "network-iface"},
    {HorizonWizard::Page_Network_Wireless, "network-wifi"},
    {HorizonWizard::Page_Network_CustomAP, "network-wifi-ap"},
    {HorizonWizard::Page_Network_DHCP, "network-dhcp"},
    {HorizonWizard::Page_Network_Portal, "network-portal"},
    {HorizonWizard::Page_Network_Manual, "network-manual"},
    {HorizonWizard::Page_DateTime, "datetime"},
    {HorizonWizard::Page_Hostname, "hostname"},
    {HorizonWizard::Page_PkgSimple, "packages-simple"},
    {HorizonWizard::Page_PkgCustom, "packages-custom"},
    {HorizonWizard::Page_PkgCustomDefault, "packages-custom-default"},
    {HorizonWizard::Page_Boot, "startup"},
    {HorizonWizard::Page_Root, "rootpw"},
    {HorizonWizard::Page_Accounts, "accounts"},
#ifndef HAS_INSTALL_ENV
    {HorizonWizard::Page_Write, "writeout"},
#else  /* HAS_INSTALL_ENV */
    {HorizonWizard::Page_Commit, "commit"}
#endif  /* !HAS_INSTALL_ENV */
};


#ifdef HAS_INSTALL_ENV
std::map<std::string, HorizonWizard::NetworkInterface> probe_ifaces(void) {
    struct udev *udev;
    struct udev_enumerate *if_list;
    struct udev_list_entry *first, *candidate;
    struct udev_device *device = nullptr;

    std::map<std::string, HorizonWizard::NetworkInterface> ifaces;

    udev = udev_new();
    if(udev == nullptr) {
        qDebug() << "Can't connect to UDev.";
        return ifaces;
    }

    if_list = udev_enumerate_new(udev);
    if(if_list == nullptr) {
        qDebug() << "Uh oh.  UDev is unhappy.";
        udev_unref(udev);
        return ifaces;
    }

    udev_enumerate_add_match_subsystem(if_list, "net");
    udev_enumerate_scan_devices(if_list);
    first = udev_enumerate_get_list_entry(if_list);
    udev_list_entry_foreach(candidate, first) {
        const char *syspath = udev_list_entry_get_name(candidate);
        const char *devtype, *cifname;
        QString mac;

        if(device != nullptr) udev_device_unref(device);
        device = udev_device_new_from_syspath(udev, syspath);
        if(device == nullptr) continue;
        devtype = udev_device_get_devtype(device);
        if(devtype == nullptr) {
            devtype = udev_device_get_sysattr_value(device, "type");
            if(devtype == nullptr) {
                qDebug() << syspath << " skipped; no device type.";
                continue;
            }
        }

        cifname = udev_device_get_property_value(device, "INTERFACE");
        if(cifname == nullptr) {
            qDebug() << syspath << " has no interface name.";
            continue;
        }

        /* Retrieving the index is always valid, and is not even privileged. */
        struct ifreq request;
        int my_sock = ::socket(AF_INET, SOCK_STREAM, 0);
        if(my_sock != -1) {
            memset(&request, 0, sizeof(request));
            memcpy(&request.ifr_name, cifname, strnlen(cifname, IFNAMSIZ));
            errno = 0;
            if(ioctl(my_sock, SIOCGIFHWADDR, &request) != -1) {
                mac = fromMacAddress(request.ifr_ifru.ifru_hwaddr.sa_data);
            }
            ::close(my_sock);
        }

        std::string ifname(cifname);
        if(strstr(devtype, "wlan")) {
            ifaces.insert({ifname, {HorizonWizard::Wireless, mac}});
        } else if(strstr(devtype, "bond")) {
            ifaces.insert({ifname, {HorizonWizard::Bonded, mac}});
        } else if(strstr(syspath, "/virtual/")) {
            /* Skip lo, tuntap, etc */
            continue;
        } else if(strstr(devtype, "1")) {
            ifaces.insert({ifname, {HorizonWizard::Ethernet, mac}});
        } else {
            ifaces.insert({ifname, {HorizonWizard::Unknown, mac}});
        }
    }

    if(device != nullptr) udev_device_unref(device);

    udev_enumerate_unref(if_list);
    udev_unref(udev);
    return ifaces;
}
#endif  /* HAS_INSTALL_ENV */


HorizonWizard::HorizonWizard(QWidget *parent) : QWizard(parent) {
    setWindowTitle(tr("Adélie Linux System Installation"));

    setFixedSize(QSize(650, 450));

    mirror_domain = "distfiles.adelielinux.org";
    version = "stable";
    /* TODO XXX:
     * Determine which platform kernel is being used, if any (-power8 etc)
     * Determine hardware requirements (easy or mainline)
     */
    kernel = "easy-kernel";

    /* REQ: UI.Global.Back.Save */
    setOption(IndependentPages);
    /* REQ: UI.Language.Buttons, Iface.UI.StandardButtons */
    setOption(HaveHelpButton);
    setOption(NoBackButtonOnStartPage);

    setSizeGripEnabled(false);

    setPage(Page_Intro, new IntroPage);
    setPage(Page_Input, new InputPage);
#ifdef NON_LIBRE_FIRMWARE
    setPage(Page_Firmware, new FirmwarePage);
#endif  /* NON_LIBRE_FIRMWARE */
    setPage(Page_Network, new NetworkingPage);
    setPage(Page_Network_Iface, new NetworkIfacePage);
    setPage(Page_Network_Wireless, new NetworkSimpleWirelessPage);
    setPage(Page_Network_DHCP, new NetDHCPPage);
    setPage(Page_DateTime, new DateTimePage);
    setPage(Page_Hostname, new HostnamePage);
    setPage(Page_PkgSimple, new PkgSimplePage);
    setPage(Page_Boot, new BootPage);

    QObject::connect(this, &QWizard::helpRequested, [=](void) {
        if(help_id_map.find(currentId()) == help_id_map.end()) {
            qDebug() << "no help available for " << currentId();
            QMessageBox nohelp(QMessageBox::Warning,
                               tr("No Help Available"),
                               tr("Help is not available for the current page."
                                  "  Consult the Installation Guide for more "
                                  "information."),
                               QMessageBox::Ok,
                               this);
            nohelp.exec();
            return;
        }
        std::string helppath = ":/wizard_help/resources/" +
                               help_id_map.at(currentId()) + "-help.txt";
        QFile helpfile(helppath.c_str());
        helpfile.open(QFile::ReadOnly);
        HorizonHelpWindow help(&helpfile, this);
        help.exec();
    });

    /* REQ: UI.Global.Cancel.Confirm */
    button(CancelButton)->disconnect(this);
    QObject::connect(button(CancelButton), &QAbstractButton::clicked,
                     [=](bool) {
        QMessageBox cancel(QMessageBox::Question,
                           tr("Exit Adélie Linux System Installation"),
                   #ifdef HAS_INSTALL_ENV
                           tr("Adélie Linux has not yet been set up on your computer.  Exiting will reboot your computer.  Do you wish to exit?"),
                   #else
                           tr("You have not yet completed the System Installation wizard.  No installfile will be generated.  Do you wish to exit?"),
                   #endif
                           QMessageBox::Yes | QMessageBox::No,
                           this);
        cancel.setDefaultButton(QMessageBox::No);
        if(cancel.exec() == QMessageBox::Yes) {
            reject();
        }
    });

    /* REQ: Iface.UI.ButtonAccel */
    setButtonText(HelpButton, tr("&Help (F1)"));
    setButtonText(CancelButton, tr("E&xit (F3)"));
    setButtonText(BackButton, tr("< &Back (F6)"));
    setButtonText(NextButton, tr("Co&ntinue > (F8)"));

    f1 = new QShortcut(Qt::Key_F1, this);
    connect(f1, &QShortcut::activated,
            button(HelpButton), &QAbstractButton::click);
    f1->setWhatsThis(tr("Activates the Help screen."));

    f3 = new QShortcut(Qt::Key_F3, this);
    connect(f3, &QShortcut::activated,
            button(CancelButton), &QAbstractButton::click);
    f3->setWhatsThis(tr("Prompts to exit the installation."));

    f5 = new QShortcut(Qt::Key_F6, this);
    connect(f5, &QShortcut::activated,
            button(BackButton), &QAbstractButton::click);
    f5->setWhatsThis(tr("Goes back to the previous page."));

    f8 = new QShortcut(Qt::Key_F8, this);
    connect(f8, &QShortcut::activated,
            button(NextButton), &QAbstractButton::click);
    f8->setWhatsThis(tr("Goes forward to the next page."));

#ifdef HAS_INSTALL_ENV
    interfaces = probe_ifaces();
    tain_now_set_stopwatch_g();
#endif  /* HAS_INSTALL_ENV */
}