// SPDX-License-Identifier: GPL-2.0-or-later
/**
 * @file
 * Interface to main application.
 */
/* Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   bulia byak <buliabyak@users.sf.net>
 *   Liam P. White <inkscapebrony@gmail.com>
 *
 * Copyright (C) 1999-2014 authors
 * c++ port Copyright (C) 2003 Nathan Hurst
 * c++ification Copyright (C) 2014 Liam P. White
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */

#include <cerrno>
#include <unistd.h>

#include <map>

#include <glibmm/fileutils.h>
#include <glibmm/regex.h>

#include <gtkmm/icontheme.h>
#include <gtkmm/messagedialog.h>

#include <glib/gstdio.h>
#include <glibmm/i18n.h>
#include <glibmm/miscutils.h>
#include <glibmm/convert.h>

#include "desktop.h"
#include "device-manager.h"
#include "document.h"
#include "inkscape.h"
#include "message-stack.h"
#include "path-prefix.h"

#include "debug/simple-event.h"
#include "debug/event-tracker.h"

#include "extension/db.h"
#include "extension/init.h"
#include "extension/output.h"
#include "extension/system.h"

#include "helper/action-context.h"

#include "io/resource.h"
#include "io/resource-manager.h"
#include "io/sys.h"

#include "libnrtype/FontFactory.h"

#include "object/sp-root.h"
#include "object/sp-style-elem.h"

#include "svg/svg-color.h"

#include "object/sp-root.h"
#include "object/sp-style-elem.h"

#include "ui/dialog/debug.h"
#include "ui/tools/tool-base.h"

/* Backbones of configuration xml data */
#include "menus-skeleton.h"

#include <fstream>

// Inkscape::Application static members
Inkscape::Application * Inkscape::Application::_S_inst = nullptr;
bool Inkscape::Application::_crashIsHappening = false;

#define DESKTOP_IS_ACTIVE(d) (INKSCAPE._desktops != nullptr && !INKSCAPE._desktops->empty() && ((d) == INKSCAPE._desktops->front()))

static void (* segv_handler) (int) = SIG_DFL;
static void (* abrt_handler) (int) = SIG_DFL;
static void (* fpe_handler)  (int) = SIG_DFL;
static void (* ill_handler)  (int) = SIG_DFL;
#ifndef _WIN32
static void (* bus_handler)  (int) = SIG_DFL;
#endif

#define MENUS_FILE "menus.xml"

#define SP_INDENT 8

/**  C++ification TODO list
 * - _S_inst should NOT need to be assigned inside the constructor, but if it isn't the Filters+Extensions menus break.
 * - Application::_deskops has to be a pointer because of a signal bug somewhere else. Basically, it will attempt to access a deleted object in sp_ui_close_all(),
 *   but if it's a pointer we can stop and return NULL in Application::active_desktop()
 * - These functions are calling Application::create for no good reason I can determine:
 *
 *   Inkscape::UI::Dialog::SVGPreview::SVGPreview()
 *       src/ui/dialog/filedialogimpl-gtkmm.cpp:542:9
 */


class InkErrorHandler : public Inkscape::ErrorReporter {
public:
    InkErrorHandler(bool useGui) : Inkscape::ErrorReporter(),
                                   _useGui(useGui)
    {}
    ~InkErrorHandler() override = default;

    void handleError( Glib::ustring const& primary, Glib::ustring const& secondary ) const override
    {
        if (_useGui) {
            Gtk::MessageDialog err(primary, false, Gtk::MESSAGE_WARNING, Gtk::BUTTONS_OK, true);
            err.set_secondary_text(secondary);
            err.run();
        } else {
            g_message("%s", primary.data());
            g_message("%s", secondary.data());
        }
    }

private:
    bool _useGui;
};

void inkscape_ref(Inkscape::Application & in)
{
    in.refCount++;
}

void inkscape_unref(Inkscape::Application & in)
{
    in.refCount--;

    if (&in == Inkscape::Application::_S_inst) {
        if (in.refCount <= 0) {
            delete Inkscape::Application::_S_inst;
        }
    } else {
        g_error("Attempt to unref an Application (=%p) not the current instance (=%p) (maybe it's already been destroyed?)",
                &in, Inkscape::Application::_S_inst);
    }
}

namespace Inkscape {

/**
 * Defined only for debugging purposes. If we are certain the bugs are gone we can remove this
 * and the references in inkscape_ref and inkscape_unref.
 */
Application*
Application::operator &() const
{
    return const_cast<Application*>(this);
}
/**
 *  Creates a new Inkscape::Application global object.
 */
void
Application::create(bool use_gui)
{
   if (!Application::exists()) {
        new Application(use_gui);
    } else {
       // g_assert_not_reached();  Can happen with InkscapeApplication
    }
}


/**
 *  Checks whether the current Inkscape::Application global object exists.
 */
bool
Application::exists()
{
    return Application::_S_inst != nullptr;
}

/**
 *  Returns the current Inkscape::Application global object.
 *  \pre Application::_S_inst != NULL
 */
Application&
Application::instance()
{
    if (!exists()) {
         g_error("Inkscape::Application does not yet exist.");
    }
    return *Application::_S_inst;
}

/* \brief Constructor for the application.
 *  Creates a new Inkscape::Application.
 *
 *  \pre Application::_S_inst == NULL
 */

Application::Application(bool use_gui) :
    _use_gui(use_gui)
{
    using namespace Inkscape::IO::Resource;
    /* fixme: load application defaults */

    segv_handler = signal (SIGSEGV, Application::crash_handler);
    abrt_handler = signal (SIGABRT, Application::crash_handler);
    fpe_handler  = signal (SIGFPE,  Application::crash_handler);
    ill_handler  = signal (SIGILL,  Application::crash_handler);
#ifndef _WIN32
    bus_handler  = signal (SIGBUS,  Application::crash_handler);
#endif

    // \TODO: this belongs to Application::init but if it isn't here
    // then the Filters and Extensions menus don't work.
    _S_inst = this;

    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    InkErrorHandler* handler = new InkErrorHandler(use_gui);
    prefs->setErrorHandler(handler);
    {
        Glib::ustring msg;
        Glib::ustring secondary;
        if (prefs->getLastError( msg, secondary )) {
            handler->handleError(msg, secondary);
        }
    }

    if (use_gui) {
        using namespace Inkscape::IO::Resource;
        auto icon_theme = Gtk::IconTheme::get_default();
        icon_theme->prepend_search_path(get_path_ustring(SYSTEM, ICONS));
        icon_theme->prepend_search_path(get_path_ustring(USER, ICONS));
        add_gtk_css();
        /* Load the preferences and menus */
        load_menus();
        Inkscape::DeviceManager::getManager().loadConfig();
    }

    Inkscape::ResourceManager::getManager();

    /* set language for user interface according setting in preferences */
    Glib::ustring ui_language = prefs->getString("/ui/language");
    if(!ui_language.empty())
    {
        setenv("LANGUAGE", ui_language, true);
    }

    /* DebugDialog redirection.  On Linux, default to OFF, on Win32, default to ON.
     * Use only if use_gui is enabled
     */
#ifdef _WIN32
#define DEFAULT_LOG_REDIRECT true
#else
#define DEFAULT_LOG_REDIRECT false
#endif

    if (use_gui && prefs->getBool("/dialogs/debug/redirect", DEFAULT_LOG_REDIRECT))
    {
        Inkscape::UI::Dialog::DebugDialog::getInstance()->captureLogMessages();
    }

    if (use_gui)
    {
        Inkscape::UI::Tools::init_latin_keys_group();
        /* Check for global remapping of Alt key */
        mapalt(guint(prefs->getInt("/options/mapalt/value", 0)));
        trackalt(guint(prefs->getInt("/options/trackalt/value", 0)));
    }

    /* Initialize the extensions */
    Inkscape::Extension::init();

    /* Initialize font factory */
    font_factory *factory = font_factory::Default();
    if (prefs->getBool("/options/font/use_fontsdir_system", true)) {
        char const *fontsdir = get_path(SYSTEM, FONTS);
        factory->AddFontsDir(fontsdir);
    }
    if (prefs->getBool("/options/font/use_fontsdir_user", true)) {
        char const *fontsdir = get_path(USER, FONTS);
        factory->AddFontsDir(fontsdir);
    }
    Glib::ustring fontdirs_pref = prefs->getString("/options/font/custom_fontdirs");
    std::vector<Glib::ustring> fontdirs = Glib::Regex::split_simple("\\|", fontdirs_pref);
    for (auto &fontdir : fontdirs) {
        factory->AddFontsDir(fontdir.c_str());
    }
}

Application::~Application()
{
    if (_desktops) {
        g_error("FATAL: desktops still in list on application destruction!");
    }

    Inkscape::Preferences::unload();

    if (_menus) {
        Inkscape::GC::release(_menus);
        _menus = nullptr;
    }

    _S_inst = nullptr; // this will probably break things

    refCount = 0;
    // gtk_main_quit ();
}


Glib::ustring Application::get_symbolic_colors()
{
    Glib::ustring css_str;
    gchar colornamed[64];
    gchar colornamedsuccess[64];
    gchar colornamedwarning[64];
    gchar colornamederror[64];
    gchar colornamed_inverse[64];
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    Glib::ustring themeiconname = prefs->getString("/theme/iconTheme");
    guint32 colorsetbase = 0x2E3436ff;
    guint32 colorsetbase_inverse = colorsetbase ^ 0xffffff00;
    guint32 colorsetsuccess = 0x4AD589ff;
    guint32 colorsetwarning = 0xF57900ff;
    guint32 colorseterror = 0xCC0000ff;
    colorsetbase = prefs->getUInt("/theme/" + themeiconname + "/symbolicBaseColor", colorsetbase);
    colorsetsuccess = prefs->getUInt("/theme/" + themeiconname + "/symbolicSuccessColor", colorsetsuccess);
    colorsetwarning = prefs->getUInt("/theme/" + themeiconname + "/symbolicWarningColor", colorsetwarning);
    colorseterror = prefs->getUInt("/theme/" + themeiconname + "/symbolicErrorColor", colorseterror);
    sp_svg_write_color(colornamed, sizeof(colornamed), colorsetbase);
    sp_svg_write_color(colornamedsuccess, sizeof(colornamedsuccess), colorsetsuccess);
    sp_svg_write_color(colornamedwarning, sizeof(colornamedwarning), colorsetwarning);
    sp_svg_write_color(colornamederror, sizeof(colornamederror), colorseterror);
    colorsetbase_inverse = colorsetbase ^ 0xffffff00;
    sp_svg_write_color(colornamed_inverse, sizeof(colornamed_inverse), colorsetbase_inverse);
    css_str += "*{-gtk-icon-palette: success ";
    css_str += colornamedsuccess;
    css_str += ", warning ";
    css_str += colornamedwarning;
    css_str += ", error ";
    css_str += colornamederror;
    css_str += ";}";
    css_str += "#InkRuler,";
    /* ":not(.rawstyle) > image" works only on images in first level of widget container
    if in the future we use a complex widget with more levels and we dont want to tweak the color
    here, retaining default we can add more lines like ":not(.rawstyle) > > image" */
    css_str += ":not(.rawstyle) > image";
    css_str += "{color:";
    css_str += colornamed;
    css_str += ";}";
    css_str += ".dark .forcebright :not(.rawstyle) > image,";
    css_str += ".dark .forcebright image:not(.rawstyle),";
    css_str += ".bright .forcedark :not(.rawstyle) > image,";
    css_str += ".bright .forcedark image:not(.rawstyle),";
    css_str += ".dark :not(.rawstyle) > image.forcebright,";
    css_str += ".dark image.forcebright:not(.rawstyle),";
    css_str += ".bright :not(.rawstyle) > image.forcedark,";
    css_str += ".bright image.forcedark:not(.rawstyle),";
    css_str += ".inverse :not(.rawstyle) > image,";
    css_str += ".inverse image:not(.rawstyle)";
    css_str += "{color:";
    css_str += colornamed_inverse;
    css_str += ";}";
    return css_str;
}

/**
 * \brief Add our CSS style sheets
 */
void Application::add_gtk_css()
{
    using namespace Inkscape::IO::Resource;
    // Add style sheet (GTK3)
    auto const screen = Gdk::Screen::get_default();
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    gchar *gtkThemeName = nullptr;
    gchar *gtkIconThemeName = nullptr;
    Glib::ustring themeiconname;
    gboolean gtkApplicationPreferDarkTheme;
    GtkSettings *settings = gtk_settings_get_default();
    if (settings) {
        g_object_get(settings, "gtk-icon-theme-name", &gtkIconThemeName, NULL);
        g_object_get(settings, "gtk-theme-name", &gtkThemeName, NULL);
        g_object_get(settings, "gtk-application-prefer-dark-theme", &gtkApplicationPreferDarkTheme, NULL);
        g_object_set(settings, "gtk-application-prefer-dark-theme",
                     prefs->getBool("/theme/preferDarkTheme", gtkApplicationPreferDarkTheme), NULL);
        prefs->setString("/theme/defaultTheme", Glib::ustring(gtkThemeName));
        prefs->setString("/theme/defaultIconTheme", Glib::ustring(gtkIconThemeName));
        Glib::ustring gtkthemename = prefs->getString("/theme/gtkTheme");
        if (gtkthemename != "") {
            g_object_set(settings, "gtk-theme-name", gtkthemename.c_str(), NULL);
        } else {
            prefs->setString("/theme/gtkTheme", Glib::ustring(gtkThemeName));
        }
        themeiconname = prefs->getString("/theme/iconTheme");
        if (themeiconname != "") {
            g_object_set(settings, "gtk-icon-theme-name", themeiconname.c_str(), NULL);
        } else {
            prefs->setString("/theme/iconTheme", Glib::ustring(gtkIconThemeName));
        }

    }

    g_free(gtkThemeName);
    g_free(gtkIconThemeName);

    Glib::ustring style = get_filename(UIS, "style.css");
    if (!style.empty()) {
        auto provider = Gtk::CssProvider::create();
        try {
            provider->load_from_path(style);
        } catch (const Gtk::CssProviderError &ex) {
            g_critical("CSSProviderError::load_from_path(): failed to load '%s'\n(%s)", style.c_str(),
                       ex.what().c_str());
        }
        Gtk::StyleContext::add_provider_for_screen(screen, provider, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
    }

    Glib::ustring gtkthemename = prefs->getString("/theme/gtkTheme");
    gtkthemename += ".css";
    style = get_filename(UIS, gtkthemename.c_str(), false, true);
    if (!style.empty()) {
        if (themeprovider) {
            Gtk::StyleContext::remove_provider_for_screen(screen, themeprovider);
        }
        if (!themeprovider) {
            themeprovider = Gtk::CssProvider::create();
        }
        try {
            themeprovider->load_from_path(style);
        } catch (const Gtk::CssProviderError &ex) {
            g_critical("CSSProviderError::load_from_path(): failed to load '%s'\n(%s)", style.c_str(),
                       ex.what().c_str());
        }
        Gtk::StyleContext::add_provider_for_screen(screen, themeprovider, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
    }

    if (!colorizeprovider) {
        colorizeprovider = Gtk::CssProvider::create();
    }
    Glib::ustring css_str = "";
    if (prefs->getBool("/theme/symbolicIcons", false)) {
        css_str = get_symbolic_colors();
    }
    try {
        colorizeprovider->load_from_data(css_str);
    } catch (const Gtk::CssProviderError &ex) {
        g_critical("CSSProviderError::load_from_data(): failed to load '%s'\n(%s)", css_str.c_str(), ex.what().c_str());
    }
    Gtk::StyleContext::add_provider_for_screen(screen, colorizeprovider, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
}

void Application::readStyleSheets(bool forceupd)
{
    SPDocument *document = SP_ACTIVE_DOCUMENT;
    Inkscape::XML::Node *root = document->getReprRoot();
    std::vector<Inkscape::XML::Node *> styles;
    for (unsigned i = 0; i < root->childCount(); ++i) {
        Inkscape::XML::Node *child = root->nthChild(i);
        if (child && strcmp(child->name(), "svg:style") == 0) {
            styles.push_back(child);
        }
    }
    if (forceupd || styles.size() > 1) {
        document->setStyleSheet(nullptr);
        for (auto style : styles) {
            gchar const *id = style->attribute("id");
            if (id) {
                SPStyleElem *styleelem = dynamic_cast<SPStyleElem *>(document->getObjectById(id));
                styleelem->read_content();
            }
        }
        document->getRoot()->emitModified(SP_OBJECT_MODIFIED_CASCADE);
    }
}

/** Sets the keyboard modifier to map to Alt.
 *
 * Zero switches off mapping, as does '1', which is the default.
 */
void Application::mapalt(guint maskvalue)
{
    if ( maskvalue < 2 || maskvalue > 5 ) {  // MOD5 is the highest defined in gdktypes.h
        _mapalt = 0;
    } else {
        _mapalt = (GDK_MOD1_MASK << (maskvalue-1));
    }
}

void
Application::crash_handler (int /*signum*/)
{
    using Inkscape::Debug::SimpleEvent;
    using Inkscape::Debug::EventTracker;
    using Inkscape::Debug::Logger;

    static bool recursion = false;

    /*
     * reset all signal handlers: any further crashes should just be allowed
     * to crash normally.
     * */
    signal (SIGSEGV, segv_handler );
    signal (SIGABRT, abrt_handler );
    signal (SIGFPE,  fpe_handler  );
    signal (SIGILL,  ill_handler  );
#ifndef _WIN32
    signal (SIGBUS,  bus_handler  );
#endif

    /* Stop bizarre loops */
    if (recursion) {
        abort ();
    }
    recursion = true;

    _crashIsHappening = true;

    EventTracker<SimpleEvent<Inkscape::Debug::Event::CORE> > tracker("crash");
    tracker.set<SimpleEvent<> >("emergency-save");

    fprintf(stderr, "\nEmergency save activated!\n");

    time_t sptime = time (nullptr);
    struct tm *sptm = localtime (&sptime);
    gchar sptstr[256];
    strftime(sptstr, 256, "%Y_%m_%d_%H_%M_%S", sptm);

    gint count = 0;
    gchar *curdir = g_get_current_dir(); // This one needs to be freed explicitly
    std::vector<gchar *> savednames;
    std::vector<gchar *> failednames;
    for (std::map<SPDocument*,int>::iterator iter = INKSCAPE._document_set.begin(), e = INKSCAPE._document_set.end();
          iter != e;
          ++iter) {
        SPDocument *doc = iter->first;
        Inkscape::XML::Node *repr;
        repr = doc->getReprRoot();
        if (doc->isModifiedSinceSave()) {
            const gchar *docname;
            char n[64];

            /* originally, the document name was retrieved from
             * the sodipod:docname attribute */
            docname = doc->getDocumentName();
            if (docname) {
                /* Removes an emergency save suffix if present: /(.*)\.[0-9_]*\.[0-9_]*\.[~\.]*$/\1/ */
                const char* d0 = strrchr ((char*)docname, '.');
                if (d0 && (d0 > docname)) {
                    const char* d = d0;
                    unsigned int dots = 0;
                    while ((isdigit (*d) || *d=='_' || *d=='.') && d>docname && dots<2) {
                        d -= 1;
                        if (*d=='.') dots++;
                    }
                    if (*d=='.' && d>docname && dots==2) {
                        size_t len = MIN (d - docname, 63);
                        memcpy (n, docname, len);
                        n[len] = '\0';
                        docname = n;
                    }
                }
            }
            if (!docname || !*docname) docname = "emergency";

            // Emergency filename
            char c[1024];
            g_snprintf (c, 1024, "%.256s.%s.%d.svg", docname, sptstr, count);

            // Find a location
            const char* locations[] = {
                doc->getDocumentBase(),
                g_get_home_dir(),
                g_get_tmp_dir(),
                curdir,
            };
            FILE *file = nullptr;
            for(auto & location : locations) {
                if (!location) continue; // It seems to be okay, but just in case
                gchar * filename = g_build_filename(location, c, NULL);
                Inkscape::IO::dump_fopen_call(filename, "E");
                file = Inkscape::IO::fopen_utf8name(filename, "w");
                if (file) {
                    g_snprintf (c, 1024, "%s", filename); // we want the complete path to be stored in c (for reporting purposes)
                    break;
                }
            }

            // Save
            if (file) {
                sp_repr_save_stream (repr->document(), file, SP_SVG_NS_URI);
                savednames.push_back(g_strdup (c));
                fclose (file);
            } else {
                failednames.push_back((doc->getDocumentName()) ? g_strdup(doc->getDocumentName()) : g_strdup (_("Untitled document")));
            }
            count++;
        }
    }
    g_free(curdir);

    if (!savednames.empty()) {
        fprintf (stderr, "\nEmergency save document locations:\n");
        for (auto i:savednames) {
            fprintf (stderr, "  %s\n", i);
        }
    }
    if (!failednames.empty()) {
        fprintf (stderr, "\nFailed to do emergency save for documents:\n");
        for (auto i:failednames) {
            fprintf (stderr, "  %s\n", i);
        }
    }

    // do not save the preferences since they can be in a corrupted state
    Inkscape::Preferences::unload(false);

    fprintf (stderr, "Emergency save completed. Inkscape will close now.\n");
    fprintf (stderr, "If you can reproduce this crash, please file a bug at https://inkscape.org/report\n");
    fprintf (stderr, "with a detailed description of the steps leading to the crash, so we can fix it.\n");

    /* Show nice dialog box */

    char const *istr = _("Inkscape encountered an internal error and will close now.\n");
    char const *sstr = _("Automatic backups of unsaved documents were done to the following locations:\n");
    char const *fstr = _("Automatic backup of the following documents failed:\n");
    gint nllen = strlen ("\n");
    gint len = strlen (istr) + strlen (sstr) + strlen (fstr);
    for (auto i:savednames) {
        len = len + SP_INDENT + strlen (i) + nllen;
    }
    for (auto i:failednames) {
        len = len + SP_INDENT + strlen (i) + nllen;
    }
    len += 1;
    gchar *b = g_new (gchar, len);
    gint pos = 0;
    len = strlen (istr);
    memcpy (b + pos, istr, len);
    pos += len;
    if (!savednames.empty()) {
        len = strlen (sstr);
        memcpy (b + pos, sstr, len);
        pos += len;
        for (auto i:savednames) {
            memset (b + pos, ' ', SP_INDENT);
            pos += SP_INDENT;
            len = strlen(i);
            memcpy (b + pos, i, len);
            pos += len;
            memcpy (b + pos, "\n", nllen);
            pos += nllen;
        }
    }
    if (!failednames.empty()) {
        len = strlen (fstr);
        memcpy (b + pos, fstr, len);
        pos += len;
        for (auto i:failednames) {
            memset (b + pos, ' ', SP_INDENT);
            pos += SP_INDENT;
            len = strlen(i);
            memcpy (b + pos, i, len);
            pos += len;
            memcpy (b + pos, "\n", nllen);
            pos += nllen;
        }
    }
    *(b + pos) = '\0';

    if ( exists() && instance().use_gui() ) {
        GtkWidget *msgbox = gtk_message_dialog_new (nullptr, GTK_DIALOG_MODAL, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", b);
        gtk_dialog_run (GTK_DIALOG (msgbox));
        gtk_widget_destroy (msgbox);
    }
    else
    {
        g_message( "Error: %s", b );
    }
    g_free (b);

    tracker.clear();
    Logger::shutdown();

    fflush(stderr); // make sure buffers are empty before crashing (otherwise output might be suppressed)

    /* on exit, allow restored signal handler to take over and crash us */
}

/**
 *  Menus management
 *
 */
bool Application::load_menus()
{
    using namespace Inkscape::IO::Resource;
    Glib::ustring filename = get_filename(UIS, MENUS_FILE);

    _menus = sp_repr_read_file(filename.c_str(), nullptr);
    if ( !_menus ) {
        _menus = sp_repr_read_mem(menus_skeleton, MENUS_SKELETON_SIZE, nullptr);
    }
    return (_menus != nullptr);
}


void
Application::selection_modified (Inkscape::Selection *selection, guint flags)
{
    g_return_if_fail (selection != nullptr);

    if (DESKTOP_IS_ACTIVE (selection->desktop())) {
        signal_selection_modified.emit(selection, flags);
    }
}


void
Application::selection_changed (Inkscape::Selection * selection)
{
    g_return_if_fail (selection != nullptr);

    if (DESKTOP_IS_ACTIVE (selection->desktop())) {
        signal_selection_changed.emit(selection);
    }
}

void
Application::subselection_changed (SPDesktop *desktop)
{
    g_return_if_fail (desktop != nullptr);

    if (DESKTOP_IS_ACTIVE (desktop)) {
        signal_subselection_changed.emit(desktop);
    }
}


void
Application::selection_set (Inkscape::Selection * selection)
{
    g_return_if_fail (selection != nullptr);

    if (DESKTOP_IS_ACTIVE (selection->desktop())) {
        signal_selection_set.emit(selection);
        signal_selection_changed.emit(selection);
    }
}


void
Application::eventcontext_set (Inkscape::UI::Tools::ToolBase * eventcontext)
{
    g_return_if_fail (eventcontext != nullptr);
    g_return_if_fail (SP_IS_EVENT_CONTEXT (eventcontext));

    if (DESKTOP_IS_ACTIVE (eventcontext->desktop)) {
        signal_eventcontext_set.emit(eventcontext);
    }
}


void
Application::add_desktop (SPDesktop * desktop)
{
    g_return_if_fail (desktop != nullptr);
    if (_desktops == nullptr) {
        _desktops = new std::vector<SPDesktop*>;
    }

    if (std::find(_desktops->begin(), _desktops->end(), desktop) != _desktops->end()) {
        g_error("Attempted to add desktop already in list.");
    }

    _desktops->insert(_desktops->begin(), desktop);

    signal_activate_desktop.emit(desktop);
    signal_eventcontext_set.emit(desktop->getEventContext());
    signal_selection_set.emit(desktop->getSelection());
    signal_selection_changed.emit(desktop->getSelection());
}



void
Application::remove_desktop (SPDesktop * desktop)
{
    g_return_if_fail (desktop != nullptr);

    if (std::find (_desktops->begin(), _desktops->end(), desktop) == _desktops->end() ) {
        g_error("Attempted to remove desktop not in list.");
    }

    desktop->setEventContext("");

    if (DESKTOP_IS_ACTIVE (desktop)) {
        signal_deactivate_desktop.emit(desktop);
        if (_desktops->size() > 1) {
            SPDesktop * new_desktop = *(++_desktops->begin());
            _desktops->erase(std::find(_desktops->begin(), _desktops->end(), new_desktop));
            _desktops->insert(_desktops->begin(), new_desktop);

            signal_activate_desktop.emit(new_desktop);
            signal_eventcontext_set.emit(new_desktop->getEventContext());
            signal_selection_set.emit(new_desktop->getSelection());
            signal_selection_changed.emit(new_desktop->getSelection());
        } else {
            signal_eventcontext_set.emit(nullptr);
            if (desktop->getSelection())
                desktop->getSelection()->clear();
        }
    }

    _desktops->erase(std::find(_desktops->begin(), _desktops->end(), desktop));

    // if this was the last desktop, shut down the program
    if (_desktops->empty()) {
        this->exit();
        delete _desktops;
        _desktops = nullptr;
    }
}



void
Application::activate_desktop (SPDesktop * desktop)
{
    g_return_if_fail (desktop != nullptr);

    if (DESKTOP_IS_ACTIVE (desktop)) {
        return;
    }

    std::vector<SPDesktop*>::iterator i;

    if ((i = std::find (_desktops->begin(), _desktops->end(), desktop)) == _desktops->end()) {
        g_error("Tried to activate desktop not added to list.");
    }

    SPDesktop *current = _desktops->front();

    signal_deactivate_desktop.emit(current);

    _desktops->erase (i);
    _desktops->insert (_desktops->begin(), desktop);

    signal_activate_desktop.emit(desktop);
    signal_eventcontext_set.emit(desktop->getEventContext());
    signal_selection_set(desktop->getSelection());
    signal_selection_changed(desktop->getSelection());
}


/**
 *  Resends ACTIVATE_DESKTOP for current desktop; needed when a new desktop has got its window that dialogs will transientize to
 */
void
Application::reactivate_desktop (SPDesktop * desktop)
{
    g_return_if_fail (desktop != nullptr);

    if (DESKTOP_IS_ACTIVE (desktop)) {
        signal_activate_desktop.emit(desktop);
    }
}



SPDesktop *
Application::find_desktop_by_dkey (unsigned int dkey)
{
    for (auto & _desktop : *_desktops) {
        if (_desktop->dkey == dkey){
            return _desktop;
        }
    }
    return nullptr;
}


unsigned int
Application::maximum_dkey()
{
    unsigned int dkey = 0;

    for (auto & _desktop : *_desktops) {
        if (_desktop->dkey > dkey){
            dkey = _desktop->dkey;
        }
    }
    return dkey;
}



SPDesktop *
Application::next_desktop ()
{
    SPDesktop *d = nullptr;
    unsigned int dkey_current = (_desktops->front())->dkey;

    if (dkey_current < maximum_dkey()) {
        // find next existing
        for (unsigned int i = dkey_current + 1; i <= maximum_dkey(); ++i) {
            d = find_desktop_by_dkey (i);
            if (d) {
                break;
            }
        }
    } else {
        // find first existing
        for (unsigned int i = 0; i <= maximum_dkey(); ++i) {
            d = find_desktop_by_dkey (i);
            if (d) {
                break;
            }
        }
    }

    g_assert (d);
    return d;
}



SPDesktop *
Application::prev_desktop ()
{
    SPDesktop *d = nullptr;
    unsigned int dkey_current = (_desktops->front())->dkey;

    if (dkey_current > 0) {
        // find prev existing
        for (signed int i = dkey_current - 1; i >= 0; --i) {
            d = find_desktop_by_dkey (i);
            if (d) {
                break;
            }
        }
    }
    if (!d) {
        // find last existing
        d = find_desktop_by_dkey (maximum_dkey());
    }

    g_assert (d);
    return d;
}



void
Application::switch_desktops_next ()
{
    next_desktop()->presentWindow();
}

void
Application::switch_desktops_prev()
{
    prev_desktop()->presentWindow();
}

void
Application::dialogs_hide()
{
    signal_dialogs_hide.emit();
    _dialogs_toggle = false;
}



void
Application::dialogs_unhide()
{
    signal_dialogs_unhide.emit();
    _dialogs_toggle = true;
}



void
Application::dialogs_toggle()
{
    if (_dialogs_toggle) {
        dialogs_hide();
    } else {
        dialogs_unhide();
    }
}

void
Application::external_change()
{
    signal_external_change.emit();
}

/**
 * fixme: These need probably signals too
 */
void
Application::add_document (SPDocument *document)
{
    g_return_if_fail (document != nullptr);

    // try to insert the pair into the list
    if (!(_document_set.insert(std::make_pair(document, 1)).second)) {
        //insert failed, this key (document) is already in the list
        for (auto & iter : _document_set) {
            if (iter.first == document) {
                // found this document in list, increase its count
                iter.second ++;
            }
       }
    } else {
        // insert succeeded, this document is new.

        // Create a selection model tied to the document for running without a GUI.
        // We create the model even if there is a GUI as there might not be a window
        // tied to the document (which would have its own selection model) as in the
        // case where a verb requires a GUI where it's not really needed (conversion
        // of verbs to actions will eliminate this need).
        g_assert(_selection_models.find(document) == _selection_models.end());
        _selection_models[document] = new AppSelectionModel(document);
    }
}


// returns true if this was last reference to this document, so you can delete it
bool
Application::remove_document (SPDocument *document)
{
    g_return_val_if_fail (document != nullptr, false);

    for (std::map<SPDocument *,int>::iterator iter = _document_set.begin();
              iter != _document_set.end();
              ++iter) {
        if (iter->first == document) {
            // found this document in list, decrease its count
            iter->second --;
            if (iter->second < 1) {
                // this was the last one, remove the pair from list
                _document_set.erase (iter);

                // also remove the selection model
                std::map<SPDocument *, AppSelectionModel *>::iterator sel_iter = _selection_models.find(document);
                if (sel_iter != _selection_models.end()) {
                    _selection_models.erase(sel_iter);
                }

                return true;
            } else {
                return false;
            }
        }
    }

    return false;
}

SPDesktop *
Application::active_desktop()
{
    if (!_desktops || _desktops->empty()) {
        return nullptr;
    }

    return _desktops->front();
}

SPDocument *
Application::active_document()
{
    if (SP_ACTIVE_DESKTOP) {
        return SP_ACTIVE_DESKTOP->getDocument();
    } else if (!_document_set.empty()) {
        // If called from the command line there will be no desktop
        // So 'fall back' to take the first listed document in the Inkscape instance
        return _document_set.begin()->first;
    }

    return nullptr;
}

bool
Application::sole_desktop_for_document(SPDesktop const &desktop) {
    SPDocument const* document = desktop.doc();
    if (!document) {
        return false;
    }
    for (auto other_desktop : *_desktops) {
        SPDocument *other_document = other_desktop->doc();
        if ( other_document == document && other_desktop != &desktop ) {
            return false;
        }
    }
    return true;
}

Inkscape::UI::Tools::ToolBase *
Application::active_event_context ()
{
    if (SP_ACTIVE_DESKTOP) {
        return SP_ACTIVE_DESKTOP->getEventContext();
    }

    return nullptr;
}

Inkscape::ActionContext
Application::active_action_context()
{
    if (SP_ACTIVE_DESKTOP) {
        return Inkscape::ActionContext(SP_ACTIVE_DESKTOP);
    }

    SPDocument *doc = active_document();
    if (!doc) {
        return Inkscape::ActionContext();
    }

    return action_context_for_document(doc);
}

Inkscape::ActionContext
Application::action_context_for_document(SPDocument *doc)
{
    // If there are desktops, check them first to see if the document is bound to one of them
    if (_desktops != nullptr) {
        for (auto desktop : *_desktops) {
            if (desktop->doc() == doc) {
                return Inkscape::ActionContext(desktop);
            }
        }
    }

    // Document is not associated with any desktops - maybe we're in command-line mode
    std::map<SPDocument *, AppSelectionModel *>::iterator sel_iter = _selection_models.find(doc);
    if (sel_iter == _selection_models.end()) {
        std::cout << "Application::action_context_for_document: no selection model" << std::endl;
        return Inkscape::ActionContext();
    }
    return Inkscape::ActionContext(sel_iter->second->getSelection());
}


/*#####################
# HELPERS
#####################*/

void
Application::refresh_display ()
{
    for (auto & _desktop : *_desktops) {
        _desktop->requestRedraw();
    }
}


/**
 *  Handler for Inkscape's Exit verb.  This emits the shutdown signal,
 *  saves the preferences if appropriate, and quits.
 */
void
Application::exit ()
{
    //emit shutdown signal so that dialogs could remember layout
    signal_shut_down.emit();

    Inkscape::Preferences::unload();
    //gtk_main_quit ();
}




Inkscape::XML::Node *
Application::get_menus()
{
    Inkscape::XML::Node *repr = _menus->root();
    g_assert (!(strcmp (repr->name(), "inkscape")));
    return repr->firstChild();
}

void
Application::get_all_desktops(std::list< SPDesktop* >& listbuf)
{
    listbuf.insert(listbuf.end(), _desktops->begin(), _desktops->end());
}

} // namespace Inkscape

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
