#include <unistd.h>
#include <gtk/gtk.h>
#include "ibus.h"
#include "engine.h"

#define GREEN "\033[0;32m"
#define RED   "\033[0;31m"
#define NC    "\033[0m"

typedef struct {
    const gchar * input;
    const gchar * output;
}TestCase;

IBusBus *m_bus;
IBusEngine *m_engine;
gchar *m_srcdir;

IBusKeymap *keymap = NULL;

const guint m_switch_hangul[3] = {IBUS_Hangul, 122, 0};

const TestCase m_test_cases[] =
{
 {"rk ", "가"}
};

static gboolean window_focus_in_event_cb (GtkWidget     *entry,
                                          GdkEventFocus *event,
                                          gpointer       data);

static guint16 guess_keycode (IBusKeymap         *keymap,
			      guint               keyval,
			      guint32             modifiers)
{
    /* The IBusKeymap only have 256 entries here,
       Use Brute Force method to get keycode from keyval. */
    guint16 keycode = 0;
    for (; keycode < 256; ++keycode) {
	if (keyval == ibus_keymap_lookup_keysym (keymap, keycode, modifiers))
	    return keycode;
    }
    return 0;
}

static IBusEngine *
create_engine_cb (IBusFactory *factory,
                  const gchar *name,
                  gpointer     data)
{
    static int i = 1;
    gchar *engine_path =
            g_strdup_printf ("/org/freedesktop/IBus/engine/hangultest/%d",
                             i++);

    m_engine = ibus_engine_new_with_type (IBUS_TYPE_HANGUL_ENGINE,
                                          name,
                                          engine_path,
                                          ibus_bus_get_connection (m_bus));
    g_free (engine_path);

    return m_engine;
}

static gboolean
register_ibus_engine ()
{
    IBusFactory *factory;
    IBusComponent *component;
    IBusEngineDesc *desc;

    m_bus = ibus_bus_new ();
    if (!ibus_bus_is_connected (m_bus)) {
        g_critical ("ibus-daemon is not running.");
        return FALSE;
    }
    factory = ibus_factory_new (ibus_bus_get_connection (m_bus));
    g_signal_connect (factory, "create-engine",
                      G_CALLBACK (create_engine_cb), NULL);

    component = ibus_component_new (
            "org.freedesktop.IBus.HangulTest",
            "Hangul Engine Test",
            "1.5.1",
            "GPL",
            "Peng Huang <shawn.p.huang@gmail.com>",
            "https://github.com/ibus/ibus/wiki",
            "",
            "ibus-hangul");
    desc = ibus_engine_desc_new (
            "hangultest",
            "Hangul Test",
            "Hangul Test",
            "en",
            "GPL",
            "Peng Huang <shawn.p.huang@gmail.com>",
            "ibus-hangul",
            "us");
    ibus_component_add_engine (component, desc);
    ibus_bus_register_component (m_bus, component);

    return TRUE;
}

static gboolean
finit (gpointer data)
{
    g_test_incomplete ("time out");
    gtk_main_quit ();
    return FALSE;
}

static void
set_engine_cb (GObject *object, GAsyncResult *res, gpointer data)
{
    IBusBus *bus = IBUS_BUS (object);
    GtkWidget *entry = GTK_WIDGET (data);
    GError *error = NULL;
    gint i;
    const gchar *p = NULL;

    if (!ibus_bus_set_global_engine_async_finish (bus, res, &error)) {
        gchar *msg = g_strdup_printf ("set engine failed: %s", error->message);
        g_test_incomplete (msg);
        g_free (msg);
        g_error_free (error);
        return;
    }

    {
        /* Switch hangul mode. */
        guint keyval = m_switch_hangul[0];
        guint keycode = m_switch_hangul[1];
        guint modifiers = m_switch_hangul[2];
        gboolean retval;

        if (keyval == 0) {
            g_test_incomplete ("ibus-hangul switch key is not set correctly.");
            return;
        }
        g_signal_emit_by_name (m_engine, "process-key-event",
                               keyval, keycode, modifiers, &retval);
        modifiers |= IBUS_RELEASE_MASK;
        sleep(1);
        g_signal_emit_by_name (m_engine, "process-key-event",
                               keyval, keycode, modifiers, &retval);
    }

    {
        /* Run test cases */
        for (i = 0;
             i < G_N_ELEMENTS(m_test_cases);
             i++) {
            for (p = m_test_cases[i].input; *p; p++) {
                gboolean retval;
                guint keyval = *p;
                guint modifiers = 0;
                guint keycode = guess_keycode (keymap, keyval, modifiers);

                if (keyval == 0)
                    break;
                g_signal_emit_by_name (m_engine, "process-key-event",
                                       keyval, keycode, modifiers, &retval);
                modifiers |= IBUS_RELEASE_MASK;
                sleep(1);
                g_signal_emit_by_name (m_engine, "process-key-event",
                                       keyval, keycode, modifiers, &retval);
            }
        }
    }

    g_signal_handlers_disconnect_by_func (entry,
                                          G_CALLBACK (window_focus_in_event_cb),
                                          NULL);
    g_timeout_add_seconds (10, finit, NULL);
}

static gboolean
window_focus_in_event_cb (GtkWidget *entry, GdkEventFocus *event, gpointer data)
{
    g_assert (m_bus != NULL);
    ibus_bus_set_global_engine_async (m_bus,
                                      "hangultest",
                                      -1,
                                      NULL,
                                      set_engine_cb,
                                      entry);
    return FALSE;
}

static void
window_inserted_text_cb (GtkEntryBuffer *buffer,
                         guint           position,
                         const gchar    *chars,
                         guint           nchars,
                         gpointer        data)
{
/* https://gitlab.gnome.org/GNOME/gtk/commit/9981f46e0b
 * The latest GTK does not emit "inserted-text" when the text is "".
 */
#if !GTK_CHECK_VERSION (3, 22, 16)
    static int n_loop = 0;
#endif
    static guint index = 0;
    gunichar code = g_utf8_get_char (chars);
    const gchar *test;
    GtkEntry *entry = GTK_ENTRY (data);

    (void)code;

#if !GTK_CHECK_VERSION (3, 22, 16)
    if (n_loop % 2 == 1) {
        n_loop = 0;
        return;
    }
#endif

    {
        /* Run test case */
        const gchar *p = chars;
        const gchar *output = m_test_cases[index].output;
        gboolean valid_output = TRUE;

        if (0 != g_strcmp0 (p, output))
            valid_output = FALSE;
        index++;

        if (valid_output) {
            test = GREEN "PASS" NC;
        } else {
            test = RED "FAIL" NC;
            g_test_fail ();
        }
        g_print ("%05d %s expected: %s typed: %s\n",
                 index, test, output, p);
    }

    if (index == G_N_ELEMENTS(m_test_cases)) {
        gtk_main_quit ();
        return;
    }

#if !GTK_CHECK_VERSION (3, 22, 16)
    n_loop++;
#endif
    gtk_entry_set_text (entry, "");
}

static void
create_window ()
{
    GtkWidget *window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    GtkWidget *entry = gtk_entry_new ();
    GtkEntryBuffer *buffer;

    g_signal_connect (window, "destroy",
                      G_CALLBACK (gtk_main_quit), NULL);
    g_signal_connect (entry, "focus-in-event",
                      G_CALLBACK (window_focus_in_event_cb), NULL);
    buffer = gtk_entry_get_buffer (GTK_ENTRY (entry));
    g_signal_connect (buffer, "inserted-text",
                      G_CALLBACK (window_inserted_text_cb), entry);
    gtk_container_add (GTK_CONTAINER (window), entry);
    gtk_widget_show_all (window);
}

static void
test_hangul (void)
{
    GLogLevelFlags flags;
    if (!register_ibus_engine ()) {
        g_test_fail ();
        return;
    }

    ibus_hangul_init (m_bus);

    create_window ();
    /* FIXME:
     * IBusIMContext opens GtkIMContextSimple as the slave and
     * GtkIMContextSimple opens the compose table on el_GR.UTF-8, and the
     * multiple outputs in el_GR's compose causes a warning in gtkcomposetable
     * and the warning always causes a fatal in GTest:
     " "GTK+ supports to output one char only: "
     */
    flags = g_log_set_always_fatal (G_LOG_LEVEL_CRITICAL);
    gtk_main ();
    g_log_set_always_fatal (flags);
}

int
main (int argc, char *argv[])
{
    const gchar *test_name;
    gchar *test_path;

    /* Run test cases with X Window. */
    g_setenv ("GDK_BACKEND", "x11", TRUE);

    ibus_init ();
    /* Avoid a warning of "AT-SPI: Could not obtain desktop path or name"
     * with gtk_main().
     */
    g_setenv ("NO_AT_BRIDGE", "1", TRUE);
    g_test_init (&argc, &argv, NULL);
    gtk_init (&argc, &argv);

    m_srcdir = argc > 1 ? g_strdup (argv[1]) : g_strdup (".");

#if GLIB_CHECK_VERSION (2, 58, 0)
    test_name = g_get_language_names_with_category ("LC_CTYPE")[0];
#else
    test_name = g_getenv ("LANG");
#endif

    test_path = g_build_filename ("/ibus-hangul", test_name, NULL);
    g_test_add_func (test_path, test_hangul);
    g_free (test_path);

    keymap = ibus_keymap_get("us");

    return g_test_run ();
}