#!/usr/bin/env bash
# F6 unit 2 -- capture the TITLE's build-in and read the sweep's drawn alpha.
#
# Discriminator: pteff03's LEAF declares alpha 255 from its own t=0, while its
# PARENT ramps 0->255 across t=70..100. So in the drawn vertex colour:
#     flat 255 throughout  => the parent is NOT multiplied in
#     a ramp 0->255        => it IS
# That also settles the port's own flagged ambiguity, whose stated separating
# interval (t=100..238) is the same one F6 is about.
#
# Simpler than the menu probe on purpose: ONE A press to skip the attract video,
# then no further input, so the title builds in undisturbed and stays.
set -u
export HOME=/sylph-home/re SDL_AUDIODRIVER=dummy DISPLAY=:98
export XENIA_PAD_FILE=/tmp/xenia_pad.txt
OUT="${1:-/sylph-home/re/f5}"; mkdir -p "$OUT"; rm -f "$OUT"/xenia_re_ui_draws_*.log
pad(){ printf '%s' "$1" > "$XENIA_PAD_FILE.tmp"; mv "$XENIA_PAD_FILE.tmp" "$XENIA_PAD_FILE"; }
pad ""
( cd "$OUT" && nohup run-canary --log_ui_draws=true \
    --ui_draw_capture_frames=6000 --ui_draw_capture_max=1500000 \
    >"$OUT/canary.stdout" 2>"$OUT/canary.stderr" & )
sleep 8
win="$(xdotool search --name "Xenia-canary" | tail -1)"
[ -n "$win" ] || { echo "FATAL: no Xenia window"; pkill -x xenia_canary; exit 1; }
xdotool windowactivate "$win" 2>/dev/null; xdotool key --window "$win" F10; xdotool key F10
echo "armed at ${SECONDS}s"

sleep 12; pad "press=A"; sleep 0.4; pad ""; echo "A (skip video) at ${SECONDS}s"

# ⚠️ ARMING IS NOT CONFIRMED BY SENDING THE KEY. Twice now a probe has printed
# "armed", pressed on, and written no draw log at all -- once because the window
# lookup failed, once with the window found and the key sent. A probe that cannot
# confirm its own instrument is recording is a probe whose negatives mean nothing.
# So: wait for the log to exist AND grow, and abort loudly if it does not.
for _ in $(seq 1 45); do
  sz=$(stat -c %s "$OUT"/xenia_re_ui_draws_*.log 2>/dev/null | head -1 || echo 0)
  [ "${sz:-0}" -gt 0 ] && break
  sleep 1
done
[ "${sz:-0}" -gt 0 ] || { echo "FATAL: armed but no draw log after 45s -- not recording"; pkill -x xenia_canary; exit 1; }
echo "logging confirmed at ${SECONDS}s (${sz} bytes)"

# --- F5: a SECOND A during the title build-in ---------------------------
# Discriminator (brief): a snap shows no intermediate alphas, an acceleration
# does. Press 2 must land while the build-in is still running.
#
# ⚠️ BLIND WALL-CLOCK TIMING DOES NOT WORK HERE and the first run proved it:
# +16 s put the press at log frame ~1217 when the title had already settled at
# ~653, so A was accepted instead of accelerating anything. The build-in is
# only ~180 log frames wide and run pacing varies 2x. So GATE ON AN OBSERVABLE:
# wait for the sweep's texture page to appear (that IS title t=70..100, the
# parent's declared gate opening), then let a fixed number of frames pass.
LOG=$(ls "$OUT"/xenia_re_ui_draws_*.log 2>/dev/null | head -1)
SWEEP=8154424FFC48FE61
for _ in $(seq 1 900); do
  grep -q "$SWEEP" "$LOG" 2>/dev/null && break
  sleep 0.2
done
grep -q "$SWEEP" "$LOG" 2>/dev/null || { echo "FATAL: sweep never appeared -- title build-in not seen"; pkill -x xenia_canary; exit 1; }
n0=$(grep -c '^--- frame' "$LOG")
echo "sweep up at log frame ${n0} (title t~70..100) at ${SECONDS}s"
target=$((n0 + ${PRESS2_FRAMES:-40}))
until [ "$(grep -c '^--- frame' "$LOG")" -ge "$target" ]; do sleep 0.2; done
echo "PRESS2 at log frame ~${target}, ${SECONDS}s"
pad "press=A"; sleep 0.4; pad ""
sleep 60
pkill -x xenia_canary
echo "done at ${SECONDS}s"; ls -la "$OUT"/*.log 2>/dev/null