MODULE test_key ;

(*
   m2SDL3 test: push synthetic SDL_Event buffers through
   SDL_PushEvent and check PollM2Event decodes type 0300H
   (key down, keycode at offset 28) and 0100H (quit).
   SDL3 events are 128 bytes; pushes return BOOLEAN.
*)

FROM SYSTEM IMPORT ADDRESS, ADR;
FROM SDL3 IMPORT SDL_Init, SDL_Quit, SDLInitEvents;
FROM SDL3Events IMPORT SDL_PushEvent, SDL_PollEvent,
   EventKeyDown, EventQuit, EventWindowCloseRequested, EventBufferBytes;
FROM SDL3Utils IMPORT PollM2Event, M2Event, evKey, evQuit;
FROM libc IMPORT printf;

VAR
   buf: ARRAY [0..EventBufferBytes-1] OF CHAR;
   ev: M2Event;

PROCEDURE ZeroBuf;
VAR j: INTEGER;
BEGIN
   FOR j := 0 TO EventBufferBytes - 1 DO buf[j] := 0C END
END ZeroBuf;

PROCEDURE Put32 (off: CARDINAL; v: CARDINAL);
BEGIN
   buf[off] := CHR(v MOD 256);
   buf[off+1] := CHR(v DIV 256 MOD 256);
   buf[off+2] := CHR(v DIV 65536 MOD 256);
   buf[off+3] := CHR(v DIV 16777216 MOD 256)
END Put32;

PROCEDURE Fail (msg: ARRAY OF CHAR);
BEGIN
   printf("FAIL test_key: %s\n", msg);
   HALT(1)
END Fail;

BEGIN
   IF NOT SDL_Init(SDLInitEvents) THEN
      printf("FAIL test_key: SDL_Init events\n");
      HALT(1)
   END;

   (* key down, keycode "q" = 113 at offset 28. *)
   ZeroBuf;
   Put32(0, EventKeyDown);
   Put32(28, 113);
   IF NOT SDL_PushEvent(ADR(buf)) THEN Fail("push key") END;

   (* window close request must also decode as quit. *)
   ZeroBuf;
   Put32(0, EventWindowCloseRequested);
   IF NOT SDL_PushEvent(ADR(buf)) THEN Fail("push close") END;

   (* quit. *)
   ZeroBuf;
   Put32(0, EventQuit);
   IF NOT SDL_PushEvent(ADR(buf)) THEN Fail("push quit") END;

   IF NOT PollM2Event(ev) THEN Fail("poll 1 empty") END;
   IF ORD(ev.kind) # ORD(evKey) THEN Fail("ev1 not key") END;
   IF NOT ev.pressed THEN Fail("ev1 not pressed") END;
   IF ev.sym # 113 THEN Fail("ev1 sym") END;

   IF NOT PollM2Event(ev) THEN Fail("poll 2 empty") END;
   IF ORD(ev.kind) # ORD(evQuit) THEN Fail("ev2 not quit") END;

   IF NOT PollM2Event(ev) THEN Fail("poll 3 empty") END;
   IF ORD(ev.kind) # ORD(evQuit) THEN Fail("ev3 not quit") END;

   IF PollM2Event(ev) THEN Fail("queue not drained") END;

   SDL_Quit;
   printf("PASS test_key\n")
END test_key.