MODULE test_widgets ;

(*
   m2-GTK4 test - widget graph + signal + state round-trip.

   Builds label/button inside a box, wires "clicked" to a handler that
   updates the label, then emits "clicked" three times with
   g_signal_emit_by_name() and reads the label text back through
   CStrToM2().  This exercises GtkBox, GtkLabel, GtkButton, the signal
   helper and the C-string helper together.  Requires a display.
*)

FROM Gio IMPORT g_application_run, g_application_quit;
FROM GtkApplication IMPORT gtk_application_new;
FROM GtkWindow IMPORT gtk_application_window_new, gtk_window_set_child;
FROM GtkBox IMPORT gtk_box_new, gtk_box_append;
FROM GtkEnums IMPORT GtkVertical;
FROM GtkLabel IMPORT gtk_label_new, gtk_label_set_text, gtk_label_get_text;
FROM GtkButton IMPORT gtk_button_new_with_label;
FROM GObject IMPORT g_signal_emit_by_name;
FROM GtkUtils IMPORT IntToStr, Connect, CStrToM2;
FROM SYSTEM IMPORT ADDRESS, ADR;
FROM libc IMPORT printf;

CONST
   AppId = "org.example.m2gtk4.TestWidgets";

VAR
   app, label, button: ADDRESS;
   clicks: INTEGER;
   passed: BOOLEAN;

(* void clicked(GtkButton *button, gpointer user_data) *)
PROCEDURE OnClicked (b: ADDRESS; data: ADDRESS);
VAR
   text: ARRAY [0..31] OF CHAR;
BEGIN
   INC(clicks);
   IntToStr(clicks, text);
   gtk_label_set_text(label, text)
END OnClicked;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   window, box: ADDRESS;
   got: ARRAY [0..31] OF CHAR;
   i: INTEGER;
BEGIN
   clicks := 0;
   passed := TRUE;

   label := gtk_label_new("0");
   button := gtk_button_new_with_label("+1");
   Connect(button, "clicked", ADR(OnClicked), NIL);

   box := gtk_box_new(GtkVertical, 6);
   gtk_box_append(box, label);
   gtk_box_append(box, button);

   window := gtk_application_window_new(application);
   gtk_window_set_child(window, box);

   FOR i := 1 TO 3 DO
      g_signal_emit_by_name(button, "clicked")
   END;

   CStrToM2(gtk_label_get_text(label), got);
   IF (clicks # 3) OR (got[0] # '3') OR (got[1] # 0C) THEN
      printf("clicks=%d label=[%s]\n", clicks, got);
      passed := FALSE
   END;

   g_application_quit(application)
END OnActivate;

VAR
   rc: INTEGER;
BEGIN
   app := gtk_application_new(AppId, 0);
   IF app = NIL THEN
      printf("test_widgets: FAIL (no app)\n");
      HALT(1)
   END;
   Connect(app, "activate", ADR(OnActivate), NIL);
   rc := g_application_run(app, 0, NIL);

   IF passed THEN
      printf("test_widgets: PASS\n");
      HALT(0)
   ELSE
      printf("test_widgets: FAIL\n");
      HALT(1)
   END
END test_widgets.