#!/usr/bin/env python3
"""Is the READY ROOM's TAKE OFF item ARMED, or still `Preparing to Sortie`?

`screen_id.py` answers "which screen", by whole-image statistics, and that is the
right contract for it — but it cannot answer this, because the two states of the
READY ROOM differ by a spinner and a greyed word and are otherwise the same
image: measured (13.4, 38.2, 135.2) while preparing against (12.7, 36.5, 133.5)
when armed. Waiting on that 1.7-unit difference would be superstition.

The disabled state is unambiguous where it actually shows: the TAKE OFF label has
**no** pixel above 170 while preparing, and **16.3 %** of its pixels above 170
once armed. Measured on three captures from two independent runs.

This does use fixed boxes, which `screen_id.py`'s header warns about — so it
carries its own check: the BRIEFINGS label below it is always enabled, and reads
**0.1027 bright in all three captures**, to four decimal places, across those two
runs. If that reference is not bright, the boxes are not on the labels and the
answer is `unknown` rather than `not armed` — which is the failure mode the
warning is about.

Only meaningful ON the READY ROOM — ask `screen_id.py` first. The MAIN MENU has
its own text in these boxes and reads `armed` (0.1342), which is not a bug in
this test but the reason it is not a screen classifier.

Usage: take_off_armed.py <png>     -> prints armed|preparing|unknown
                                      exit 0 only when armed
"""
import sys
from PIL import Image

TAKE_OFF = (548, 140, 745, 182)
BRIEFINGS = (548, 196, 760, 238)   # always enabled — the position self-check
BRIGHT = 170


def bright_fraction(im, box):
    px = list(im.crop(box).getdata())
    return sum(1 for v in px if v > BRIGHT) / len(px)


def state(path):
    im = Image.open(path).convert("L")
    ref = bright_fraction(im, BRIEFINGS)
    if ref < 0.04:
        return "unknown", 0.0, ref
    tgt = bright_fraction(im, TAKE_OFF)
    return ("armed" if tgt > 0.04 else "preparing"), tgt, ref


if __name__ == "__main__":
    st, tgt, ref = state(sys.argv[1])
    print(f"{st} take_off={tgt:.4f} briefings_ref={ref:.4f}")
    sys.exit(0 if st == "armed" else 1)