MODULE test_gerror ;

(*
   m2-GTK4 test - GError handling and ownership helpers.

   Triggers a real GError by deleting a non-existent file, checks the
   message and the GIO error domain/code, copies/frees it, then clears
   it with GtkUtils.ClearError.  Needs no display.
*)

FROM GioError IMPORT g_io_error_quark, GIOErrorNotFound;
FROM GError IMPORT GError, g_error_matches, g_error_copy, g_error_free;
FROM GFile IMPORT g_file_new_for_path, g_file_delete;
FROM GtkUtils IMPORT ErrorMessage, ClearError, Unref;
FROM SYSTEM IMPORT ADDRESS, ADR;
FROM libc IMPORT printf;

VAR
   failed: BOOLEAN;

PROCEDURE Check (condition: BOOLEAN; what: ARRAY OF CHAR);
BEGIN
   IF NOT condition THEN
      printf("FAIL: %s\n", what);
      failed := TRUE
   END
END Check;

VAR
   file: ADDRESS;
   err, copy: GError;
   buf: ARRAY [0..255] OF CHAR;
BEGIN
   failed := FALSE;

   file := g_file_new_for_path("/no/such/m2gtk4/error/path");
   err := NIL;

   IF g_file_delete(file, NIL, ADR(err)) # 0 THEN
      Check(FALSE, "delete unexpectedly succeeded")
   END;

   Check(err # NIL, "error was set");

   IF err # NIL THEN
      ErrorMessage(err, buf);
      Check(buf[0] # 0C, "error message non-empty");

      Check(g_error_matches(err, g_io_error_quark(), GIOErrorNotFound) # 0,
            "error matches GIO_ERROR_NOT_FOUND");

      copy := g_error_copy(err);
      Check(copy # NIL, "g_error_copy");
      IF copy # NIL THEN g_error_free(copy) END;

      ClearError(err);
      Check(err = NIL, "ClearError set the variable to NIL")
   END;

   Unref(file);

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