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/*
 * Copyright (C) 2011, 2012  Dan Nicholson <dbn.lists@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; either version 2 of the License, or (at
 * your option) any later version.

 * 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 Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

#include <config.h>
#include <stdlib.h>
#include <glib.h>
#include <gtk/gtk.h>
#if GTK_MAJOR_VERSION > 2
#include <gtk/gtkx.h>
#endif
#include <gdk/gdkx.h>
#include "evbp-viewer.h"

enum run_mode {
    MODE_EMBEDDED,
    MODE_SOCKET,
    MODE_PLUG
};

static gboolean opt_fork = FALSE;
static gboolean opt_plug = FALSE;
static gint64 opt_sockwin = 0;

static GOptionEntry options[] = {
    { "fork", 'f', 0, G_OPTION_ARG_NONE, &opt_fork,
      "Start a separate process for the plug", NULL },
    { "plug", 'p', 0, G_OPTION_ARG_NONE, &opt_plug,
      "Be the plug process", NULL },
    { "socket", 's', 0, G_OPTION_ARG_INT64, &opt_sockwin,
      "Socket window ID for the plug to use", "W" },
    { NULL }
};

static inline void
no_debug(const gchar *domain, GLogLevelFlags level,
         const gchar *message, gpointer data)
{
}

static void
plug_added_cb(GtkSocket *socket, gpointer data)
{
    GtkWidget *window = GTK_WIDGET(data);

    g_debug("Plug added to socket, showing toplevel window");
    gtk_widget_show_all(window);
}

static gboolean
plug_removed_cb(GtkSocket *socket, gpointer data)
{
    g_debug("Plug removed from socket");
    return FALSE;
}

int
main(int argc, char *argv[])
{
    GOptionContext *opt;
    int mode;
    GtkWidget *window;
    GtkWidget *box;
    GtkWidget *socket;
    GtkWidget *button;
    GtkWidget *plug;
    GtkWidget *viewer;
    Window sockwin = 0;
    GFile *file;
    gchar *uri = NULL;
    GError *error = NULL;

    if (!getenv("EVBP_DEBUG"))
        g_log_set_handler(G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, no_debug, NULL);

    opt = g_option_context_new("- test EvbpViewer embedding");
    g_option_context_add_main_entries(opt, options, NULL);
    if (!g_option_context_parse(opt, &argc, &argv, &error)) {
        g_printerr("%s\n", error->message);
        exit(EXIT_FAILURE);
    }
    g_option_context_free(opt);

    /* figure out how we're executing */
    if (opt_plug) {
        mode = MODE_PLUG;
        g_debug("Running in separate process for plug");
    } else if (opt_fork) {
        mode = MODE_SOCKET;
        g_debug("Running in separate process for socket");
    } else {
        mode = MODE_EMBEDDED;
        g_debug("Running with socket and plug in same process");
    }

    /* process can only be the plug if a socket window was supplied */
    if (mode == MODE_PLUG) {
        if (opt_sockwin == 0) {
            g_printerr("No socket window supplied for plug\n");
            exit(EXIT_FAILURE);
        }
        sockwin = (Window)opt_sockwin;
    }

    if (argc < 2) {
        g_printerr("No file supplied to open\n");
        exit(EXIT_FAILURE);
    }

    gtk_init(&argc, &argv);

    if (mode != MODE_SOCKET) {
        g_debug("Initializing evince");
        if (!ev_init()) {
            g_printerr("No evince backends found\n");
            exit(EXIT_FAILURE);
        }
        ev_stock_icons_init();

        file = g_file_new_for_commandline_arg(argv[1]);
        uri = g_file_get_uri(file);
        g_object_unref(file);
        g_debug("Using uri \"%s\" for file \"%s\"", uri, argv[1]);
    }

    if (mode != MODE_PLUG) {
        g_set_application_name("Evince Previewer Socket Test");
        gtk_window_set_default_icon_name("evince");

        window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
        gtk_window_set_default_size(GTK_WINDOW(window), 800, 800);
        g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

        /* box with button to quit */
        box = gtk_vbox_new(FALSE, 0);
        gtk_container_add(GTK_CONTAINER(window), box);
        button = gtk_button_new_with_label("Quit");
        gtk_box_pack_end(GTK_BOX(box), button, FALSE, FALSE, 0);
        g_signal_connect(button, "clicked", G_CALLBACK(gtk_main_quit), NULL);

        /* create a socket to embed the viewer in */
        socket = gtk_socket_new();
        g_signal_connect(socket, "plug-added", G_CALLBACK(plug_added_cb),
                         window);
        g_signal_connect(socket, "plug-removed", G_CALLBACK(plug_removed_cb),
                         NULL);
        gtk_box_pack_start(GTK_BOX(box), socket, TRUE, TRUE, 0);

        /* get the socket window ID to pass to the plug process */
        gtk_widget_realize(socket);
        sockwin = gtk_socket_get_id(GTK_SOCKET(socket));
        g_debug("The ID of the socket window is %lu",
                (unsigned long)sockwin);
    }

    if (mode != MODE_SOCKET) {
        /* create a plug to for the socket */
        g_debug("Creating plug from window %lu", (unsigned long)sockwin);
        plug = gtk_plug_new(sockwin);
        viewer = evbp_viewer_new();
        gtk_container_add(GTK_CONTAINER(plug), viewer);
        gtk_widget_show_all(plug);

        /* load the file */
        if (!evbp_viewer_load_uri(EVBP_VIEWER(viewer), uri, &error)) {
            g_printerr("could not open '%s': %s\n", uri, error->message);
            g_error_free(error);
            exit(EXIT_FAILURE);
        }
        g_free(uri);
    } else {
        gchar *cmd;

        /* spawn the plug process */
        cmd = g_strdup_printf("\"%s\" -p -s %lu \"%s\"", argv[0],
                              (unsigned long)sockwin, argv[1]);
        g_debug("Executing separate plug process: %s", cmd);
        if (!g_spawn_command_line_async(cmd, &error)) {
            g_printerr("Failed to spawn plug process '%s': %s\n", cmd,
                       error->message);
            g_error_free(error);
            exit(EXIT_FAILURE);
        }
        g_free(cmd);
    }

    gtk_main();

    if (mode != MODE_SOCKET) {
        g_debug("Shutting down evince");
        ev_shutdown();
        ev_stock_icons_shutdown();
    }

    return 0;
}