#!/usr/bin/env bash
# scripts/manual/run_upstream_av_sync.sh
# Manual: upstream A/V sync hardware probe; not part of CI.
#
# Manual: capture the real Tethys webcam/mic endpoints while the shared-clock
# sync probe streams upstream media through Lesavka, then analyze the skew.

set -euo pipefail

SCRIPT_DIR="$(cd -- "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
REPO_ROOT="$(cd -- "${SCRIPT_DIR}/../.." >/dev/null 2>&1 && pwd)"

TETHYS_HOST=${TETHYS_HOST:-tethys}
LESAVKA_SERVER_HOST=${LESAVKA_SERVER_HOST:-theia}
LESAVKA_SERVER_CONNECT_HOST=${LESAVKA_SERVER_CONNECT_HOST:-38.28.125.112}
LESAVKA_SERVER_ADDR=${LESAVKA_SERVER_ADDR:-auto}
LESAVKA_SERVER_SCHEME=${LESAVKA_SERVER_SCHEME:-https}
LESAVKA_TLS_DOMAIN=${LESAVKA_TLS_DOMAIN:-lesavka-server}
PROBE_DURATION_SECONDS=${PROBE_DURATION_SECONDS:-10}
PROBE_WARMUP_SECONDS=${PROBE_WARMUP_SECONDS:-4}
PROBE_TIMEOUT_SECONDS=${PROBE_TIMEOUT_SECONDS:-$((PROBE_DURATION_SECONDS + PROBE_WARMUP_SECONDS + 20))}
# Do not open the UVC host capture far ahead of the probe. The gadget side only
# has frames once the sync probe is feeding the server, and some hosts time out
# VIDIOC_STREAMON if the camera is starved during pre-roll.
LEAD_IN_SECONDS=${LEAD_IN_SECONDS:-0}
TAIL_SECONDS=${TAIL_SECONDS:-2}
CAPTURE_SECONDS=${CAPTURE_SECONDS:-$((PROBE_DURATION_SECONDS + PROBE_WARMUP_SECONDS + LEAD_IN_SECONDS + TAIL_SECONDS))}
LOCAL_OUTPUT_DIR=${LOCAL_OUTPUT_DIR:-/tmp}
REMOTE_VIDEO_DEVICE=${REMOTE_VIDEO_DEVICE:-auto}
VIDEO_SIZE=${VIDEO_SIZE:-auto}
VIDEO_FPS=${VIDEO_FPS:-auto}
VIDEO_FORMAT=${VIDEO_FORMAT:-mjpeg}
REMOTE_CAPTURE_STACK=${REMOTE_CAPTURE_STACK:-pulse}
REMOTE_PULSE_CAPTURE_TOOL=${REMOTE_PULSE_CAPTURE_TOOL:-ffmpeg}
REMOTE_PULSE_VIDEO_MODE=${REMOTE_PULSE_VIDEO_MODE:-copy}
REMOTE_AUDIO_SOURCE=${REMOTE_AUDIO_SOURCE:-auto}
REMOTE_AUDIO_QUIESCE_USER_AUDIO=${REMOTE_AUDIO_QUIESCE_USER_AUDIO:-auto}
ANALYSIS_NORMALIZE=${ANALYSIS_NORMALIZE:-0}
ANALYSIS_SCALE_WIDTH=${ANALYSIS_SCALE_WIDTH:-1280}
SSH_OPTS=${SSH_OPTS:-"-o BatchMode=yes -o ConnectTimeout=30"}
LOCAL_AUDIO_SANITY=${LOCAL_AUDIO_SANITY:-1}
PROBE_PREBUILD=${PROBE_PREBUILD:-1}
PROBE_BIN=${PROBE_BIN:-"${REPO_ROOT}/target/debug/lesavka-sync-probe"}
ANALYZE_BIN=${ANALYZE_BIN:-"${REPO_ROOT}/target/debug/lesavka-sync-analyze"}
REMOTE_ANALYZE=${REMOTE_ANALYZE:-1}
REMOTE_ANALYZE_BIN=${REMOTE_ANALYZE_BIN:-/tmp/lesavka-sync-analyze}
REMOTE_ANALYZE_COPY=${REMOTE_ANALYZE_COPY:-1}
FETCH_CAPTURE=${FETCH_CAPTURE:-0}
REMOTE_SERVER_PREFLIGHT=${REMOTE_SERVER_PREFLIGHT:-1}
REMOTE_EXPECT_CAM_OUTPUT=${REMOTE_EXPECT_CAM_OUTPUT:-uvc}
REMOTE_EXPECT_UVC_CODEC=${REMOTE_EXPECT_UVC_CODEC:-mjpeg}
CAPTURE_READY_MARKER="__LESAVKA_CAPTURE_READY__"

STAMP="$(date +%Y%m%d-%H%M%S)"
REMOTE_CAPTURE=${REMOTE_CAPTURE:-"/tmp/lesavka-sync-probe-${STAMP}.mkv"}
LOCAL_REPORT_DIR="${LOCAL_OUTPUT_DIR%/}/lesavka-sync-probe-${STAMP}"
LOCAL_CAPTURE="${LOCAL_REPORT_DIR}/capture.mkv"
LOCAL_ANALYSIS_JSON="${LOCAL_REPORT_DIR}/report.json"
LOCAL_REPORT_TXT="${LOCAL_REPORT_DIR}/report.txt"
LOCAL_EVENTS_CSV="${LOCAL_REPORT_DIR}/events.csv"
LOCAL_CAPTURE_LOG="${LOCAL_REPORT_DIR}/capture.log"
mkdir -p "${LOCAL_REPORT_DIR}"
RESOLVED_LESAVKA_SERVER_ADDR=""
SERVER_TUNNEL_PID=""
SERVER_TUNNEL_REMOTE_PORT=""
SERVER_TUNNEL_LOCAL_PORT=""

cleanup_server_tunnel() {
  if [[ -z "${SERVER_TUNNEL_PID}" ]]; then
    return 0
  fi
  if kill -0 "${SERVER_TUNNEL_PID}" >/dev/null 2>&1; then
    kill "${SERVER_TUNNEL_PID}" >/dev/null 2>&1 || true
    wait "${SERVER_TUNNEL_PID}" >/dev/null 2>&1 || true
  fi
}

trap cleanup_server_tunnel EXIT

pick_local_server_tunnel_port() {
  python3 - <<'PY'
import socket

with socket.socket() as sock:
    sock.bind(("127.0.0.1", 0))
    print(sock.getsockname()[1])
PY
}

wait_for_server_tunnel() {
  local local_port=$1
  local tries=50
  local i=0
  while (( i < tries )); do
    if nc -z 127.0.0.1 "${local_port}" >/dev/null 2>&1; then
      return 0
    fi
    if ! kill -0 "${SERVER_TUNNEL_PID}" >/dev/null 2>&1; then
      wait "${SERVER_TUNNEL_PID}" >/dev/null 2>&1 || true
      echo "SSH tunnel to ${LESAVKA_SERVER_HOST} exited before becoming ready" >&2
      exit 88
    fi
    sleep 0.1
    ((i += 1))
  done

  echo "SSH tunnel to ${LESAVKA_SERVER_HOST} did not become ready on localhost:${local_port}" >&2
  exit 89
}

start_server_tunnel() {
  local remote_port=$1
  local local_port
  local_port="$(pick_local_server_tunnel_port)"
  echo "==> opening SSH tunnel to ${LESAVKA_SERVER_HOST}:127.0.0.1:${remote_port} on localhost:${local_port}"
  ssh ${SSH_OPTS} -o ExitOnForwardFailure=yes \
    -N \
    -L "127.0.0.1:${local_port}:127.0.0.1:${remote_port}" \
    "${LESAVKA_SERVER_HOST}" &
  SERVER_TUNNEL_PID=$!
  SERVER_TUNNEL_REMOTE_PORT="${remote_port}"
  SERVER_TUNNEL_LOCAL_PORT="${local_port}"
  wait_for_server_tunnel "${local_port}"
}

resolve_server_addr() {
  if [[ "${LESAVKA_SERVER_ADDR}" != "auto" ]]; then
    RESOLVED_LESAVKA_SERVER_ADDR="${LESAVKA_SERVER_ADDR}"
    return 0
  fi

  local bind_addr port
  bind_addr="$(
    ssh ${SSH_OPTS} "${LESAVKA_SERVER_HOST}" \
      "grep -E '^LESAVKA_SERVER_BIND_ADDR=' /etc/lesavka/server.env 2>/dev/null | tail -n1 | cut -d= -f2-" \
      2>/dev/null || true
  )"
  port="${bind_addr##*:}"
  if [[ "${port}" =~ ^[0-9]+$ ]]; then
    start_server_tunnel "${port}"
    RESOLVED_LESAVKA_SERVER_ADDR="${LESAVKA_SERVER_SCHEME}://127.0.0.1:${SERVER_TUNNEL_LOCAL_PORT}"
    return 0
  fi

  start_server_tunnel "50051"
  RESOLVED_LESAVKA_SERVER_ADDR="${LESAVKA_SERVER_SCHEME}://127.0.0.1:${SERVER_TUNNEL_LOCAL_PORT}"
}

preflight_server_path() {
  [[ "${REMOTE_SERVER_PREFLIGHT}" != "0" ]] || return 0

  echo "==> verifying Lesavka server path on ${LESAVKA_SERVER_HOST}"
  ssh ${SSH_OPTS} "${LESAVKA_SERVER_HOST}" bash -s -- \
    "${REMOTE_EXPECT_CAM_OUTPUT}" \
    "${REMOTE_EXPECT_UVC_CODEC}" <<'REMOTE_PREFLIGHT'
set -euo pipefail
expect_cam_output=$1
expect_uvc_codec=$2

read_env_value() {
  local key=$1
  local file=$2
  local value=""
  value=$(grep -E "^${key}=" "$file" 2>/dev/null | tail -n1 | cut -d= -f2- || true)
  printf '%s\n' "$value"
}

cam_output=$(read_env_value "LESAVKA_CAM_OUTPUT" /etc/lesavka/server.env)
server_uvc_codec=$(read_env_value "LESAVKA_UVC_CODEC" /etc/lesavka/server.env)
runtime_uvc_codec=$(read_env_value "LESAVKA_UVC_CODEC" /etc/lesavka/uvc.env)

printf '   ↪ server.env CAM_OUTPUT=%s\n' "${cam_output:-<unset>}"
printf '   ↪ server.env UVC_CODEC=%s\n' "${server_uvc_codec:-<unset>}"
printf '   ↪ uvc.env    UVC_CODEC=%s\n' "${runtime_uvc_codec:-<unset>}"

if [[ -n "${expect_cam_output}" && "${cam_output}" != "${expect_cam_output}" ]]; then
  printf 'expected CAM_OUTPUT=%s but found %s\n' "${expect_cam_output}" "${cam_output:-<unset>}" >&2
  exit 64
fi
if [[ -n "${expect_uvc_codec}" && "${server_uvc_codec}" != "${expect_uvc_codec}" ]]; then
  printf 'expected server.env UVC_CODEC=%s but found %s\n' "${expect_uvc_codec}" "${server_uvc_codec:-<unset>}" >&2
  exit 65
fi
if [[ -n "${expect_uvc_codec}" && "${runtime_uvc_codec}" != "${expect_uvc_codec}" ]]; then
  printf 'expected uvc.env UVC_CODEC=%s but found %s\n' "${expect_uvc_codec}" "${runtime_uvc_codec:-<unset>}" >&2
  exit 66
fi

systemctl is-active lesavka-server lesavka-uvc lesavka-core >/dev/null
REMOTE_PREFLIGHT
}

print_lesavka_versions() {
  echo "==> Lesavka versions under test"
  if [[ ! -x "${REPO_ROOT}/target/debug/lesavka-relayctl" ]]; then
    (cd "${REPO_ROOT}" && cargo build -p lesavka_client --bin lesavka-relayctl >/dev/null)
  fi
  local version_output
  if ! version_output="$(
    LESAVKA_TLS_DOMAIN="${LESAVKA_TLS_DOMAIN}" \
      "${REPO_ROOT}/target/debug/lesavka-relayctl" \
      --server "${RESOLVED_LESAVKA_SERVER_ADDR}" \
      version 2>&1
  )"; then
    echo "failed to query Lesavka versions through ${RESOLVED_LESAVKA_SERVER_ADDR}" >&2
    echo "${version_output}" >&2
    return 1
  fi
  if ! grep -q "^client_version=" <<<"${version_output}"; then
    echo "Lesavka version query did not report client_version=; refusing to run an unattributed probe" >&2
    echo "${version_output}" >&2
    return 1
  fi
  if grep -q "^client_full_version=" <<<"${version_output}"; then
    echo "Lesavka version query reported a combined version+revision; refusing ambiguous probe attribution" >&2
    echo "${version_output}" >&2
    return 1
  fi
  if ! grep -q "^client_revision=" <<<"${version_output}"; then
    echo "Lesavka version query did not report client_revision=; refusing to run an unattributed probe" >&2
    echo "${version_output}" >&2
    return 1
  fi
  if ! grep -q "^server_version=" <<<"${version_output}"; then
    echo "Lesavka version query did not report server_version=; refusing to run an unattributed probe" >&2
    echo "${version_output}" >&2
    return 1
  fi
  if ! grep -q "^server_revision=" <<<"${version_output}"; then
    echo "Lesavka version query did not report server_revision=; refusing to run an unattributed probe" >&2
    echo "${version_output}" >&2
    return 1
  fi
  while IFS= read -r line; do
    [[ -n "${line}" ]] && echo "   ↪ ${line}"
  done <<<"${version_output}"
}

if [[ "${LOCAL_AUDIO_SANITY}" != "0" ]]; then
  echo "==> verifying local speaker-to-mic sanity before upstream sync run"
  "${SCRIPT_DIR}/run_local_audio_sanity.sh"
fi

if [[ "${PROBE_PREBUILD}" != "0" ]]; then
  echo "==> prebuilding sync probe/analyzer before opening the capture window"
  (
    cd "${REPO_ROOT}"
    cargo build -p lesavka_client --bin lesavka-sync-probe --bin lesavka-sync-analyze --bin lesavka-relayctl
  )
fi

if [[ ! -x "${PROBE_BIN}" ]]; then
  echo "sync probe binary not found at ${PROBE_BIN}" >&2
  exit 1
fi
if [[ ! -x "${ANALYZE_BIN}" ]]; then
  echo "sync analyzer binary not found at ${ANALYZE_BIN}" >&2
  exit 1
fi

resolve_server_addr
echo "==> resolved Lesavka server addr: ${RESOLVED_LESAVKA_SERVER_ADDR}"
if [[ -n "${SERVER_TUNNEL_PID}" ]]; then
  echo "   ↪ tunneled to ${LESAVKA_SERVER_HOST}:127.0.0.1:${SERVER_TUNNEL_REMOTE_PORT}"
fi

print_lesavka_versions
preflight_server_path

echo "==> starting Tethys capture on ${TETHYS_HOST}"
ssh ${SSH_OPTS} "${TETHYS_HOST}" bash -s -- \
  "${REMOTE_CAPTURE}" \
  "${CAPTURE_SECONDS}" \
  "${REMOTE_VIDEO_DEVICE}" \
  "${VIDEO_SIZE}" \
  "${VIDEO_FPS}" \
  "${VIDEO_FORMAT}" \
  "${REMOTE_CAPTURE_STACK}" \
  "${REMOTE_PULSE_CAPTURE_TOOL}" \
  "${REMOTE_PULSE_VIDEO_MODE}" \
  "${REMOTE_AUDIO_SOURCE}" \
  "${REMOTE_AUDIO_QUIESCE_USER_AUDIO}" \
  > >(tee "${LOCAL_CAPTURE_LOG}") \
  2> >(tee -a "${LOCAL_CAPTURE_LOG}" >&2) <<'REMOTE_CAPTURE_SCRIPT' &
set -euo pipefail
remote_capture=$1
capture_seconds=$2
remote_video_device=$3
video_size=$4
video_fps=$5
video_format=$6
remote_capture_stack=$7
remote_pulse_capture_tool=$8
remote_pulse_video_mode=$9
remote_audio_source=${10}
remote_audio_quiesce_user_audio=${11}

rm -f "${remote_capture}"

restore_user_audio() {
  systemctl --user start pipewire.socket pipewire-pulse.socket wireplumber.service >/dev/null 2>&1 || true
  sleep 1
  systemctl --user start pipewire.service pipewire-pulse.service >/dev/null 2>&1 || true
}

quiesce_user_audio() {
  systemctl --user stop pipewire-pulse.service pipewire.service wireplumber.service \
    pipewire-pulse.socket pipewire.socket >/dev/null 2>&1 || true
  sleep 1
}

resolve_video_device() {
  local requested=$1
  if [[ "${requested}" != "auto" ]]; then
    printf '%s\n' "${requested}"
    return 0
  fi

  local by_id
  by_id=$(find /dev/v4l/by-id -maxdepth 1 -type l -name '*Lesavka*video-index0' 2>/dev/null | head -n1 || true)
  if [[ -n "${by_id}" ]]; then
    printf '%s\n' "${by_id}"
    return 0
  fi

  if command -v v4l2-ctl >/dev/null 2>&1; then
    local resolved
    resolved="$(
      v4l2-ctl --list-devices 2>/dev/null \
        | awk '
            BEGIN { want=0 }
            /Lesavka Composite: UVC Camera/ { want=1; next }
            /^[^ \t]/ { want=0 }
            want && /^[ \t]+\/dev\/video[0-9]+/ {
              gsub(/^[ \t]+/, "", $0)
              print
              exit
            }
          '
    )"
    if [[ -n "${resolved}" ]]; then
      printf '%s\n' "${resolved}"
      return 0
    fi
  fi

  printf 'Lesavka UVC video device not found on Tethys; refusing to fall back to an unrelated webcam/capture card.\n' >&2
  exit 64
}

resolve_pulse_source() {
  if ! command -v pactl >/dev/null 2>&1; then
    return 1
  fi
  pactl list short sources 2>/dev/null \
    | awk '
      /alsa_input\..*Lesavka_Composite/ { print $2; found=1; exit }
      /Lesavka_Composite/ && !fallback { fallback=$2 }
      END {
        if (found) exit 0
        if (fallback != "") { print fallback; exit 0 }
        exit 1
      }
    '
}

resolve_alsa_audio_device() {
  if ! command -v arecord >/dev/null 2>&1; then
    return 1
  fi

  arecord -l 2>/dev/null | awk '
    /^card [0-9]+:/ && ($0 ~ /Lesavka|UAC2_Gadget|UAC2Gadget|Composite/) {
      card=$2
      sub(":", "", card)
      for (i = 1; i <= NF; i++) {
        if ($i == "device") {
          dev=$(i + 1)
          sub(":", "", dev)
          printf "hw:%s,%s\n", card, dev
          found=1
          exit 0
        }
      }
    }
    END {
      if (!found) exit 1
    }
  '
}

gst_video_source_caps() {
  case "${video_format}" in
    ""|mjpeg|MJPG)
      printf 'image/jpeg,width=%s,height=%s,framerate=%s/1' \
        "${resolved_video_size%x*}" \
        "${resolved_video_size#*x}" \
        "${resolved_video_fps}"
      ;;
    yuyv422|YUYV|yuyv)
      printf 'video/x-raw,format=YUY2,width=%s,height=%s,framerate=%s/1' \
        "${resolved_video_size%x*}" \
        "${resolved_video_size#*x}" \
        "${resolved_video_fps}"
      ;;
    *)
      printf 'unsupported gst video_format=%s\n' "${video_format}" >&2
      exit 64
      ;;
  esac
}

gst_video_decode_chain() {
  case "${video_format}" in
    ""|mjpeg|MJPG)
      printf 'jpegdec ! '
      ;;
    yuyv422|YUYV|yuyv)
      printf ''
      ;;
    *)
      printf 'unsupported gst video_format=%s\n' "${video_format}" >&2
      exit 64
      ;;
  esac
}

current_video_profile() {
  if ! command -v v4l2-ctl >/dev/null 2>&1; then
    return 1
  fi

  v4l2-ctl -d "${resolved_video_device}" --all 2>/dev/null \
    | awk '
        /Width\/Height[[:space:]]*:/ {
          split($0, a, ":")
          gsub(/^[ \t]+/, "", a[2])
          split(a[2], wh, "/")
          width=wh[1]
          height=wh[2]
          next
        }
        /Frames per second:/ {
          fps=$4
          sub(/\..*/, "", fps)
        }
        END {
          if (width != "" && height != "") {
            print "size=" width "x" height
          }
          if (fps != "") {
            print "fps=" fps
          }
        }
      '
}

resolve_video_size() {
  local requested=$1
  if [[ "${requested}" != "auto" ]]; then
    printf '%s\n' "${requested}"
    return 0
  fi
  local current_profile
  current_profile="$(current_video_profile || true)"
  local current_size
  current_size="$(awk -F= '/^size=/{print $2; exit}' <<<"${current_profile}")"
  if [[ -n "${current_size}" ]]; then
    printf '%s\n' "${current_size}"
    return 0
  fi
  if ! command -v v4l2-ctl >/dev/null 2>&1; then
    printf '640x480\n'
    return 0
  fi
  local listing
  listing="$(v4l2-ctl -d "${resolved_video_device}" --list-formats-ext 2>/dev/null || true)"
  local preferred
  for preferred in 1920x1080 1360x768 1280x720; do
    if grep -q "Size: Discrete ${preferred}" <<<"${listing}"; then
      printf '%s\n' "${preferred}"
      return 0
    fi
  done
  local first_size
  first_size="$(grep -m1 -o 'Size: Discrete [0-9]\+x[0-9]\+' <<<"${listing}" | awk '{print $3}' || true)"
  if [[ -n "${first_size}" ]]; then
    printf '%s\n' "${first_size}"
    return 0
  fi
  printf '640x480\n'
}

resolve_video_fps() {
  local requested=$1
  if [[ "${requested}" != "auto" ]]; then
    printf '%s\n' "${requested}"
    return 0
  fi
  local current_profile
  current_profile="$(current_video_profile || true)"
  local current_fps
  current_fps="$(awk -F= '/^fps=/{print $2; exit}' <<<"${current_profile}")"
  if [[ -n "${current_fps}" ]]; then
    printf '%s\n' "${current_fps}"
    return 0
  fi
  if ! command -v v4l2-ctl >/dev/null 2>&1; then
    printf '20\n'
    return 0
  fi
  local listing
  listing="$(v4l2-ctl -d "${resolved_video_device}" --list-formats-ext 2>/dev/null || true)"
  local first_fps
  first_fps="$(grep -m1 -o '[0-9]\+\.[0-9]\+ fps' <<<"${listing}" | awk '{sub(/\..*/, "", $1); print $1}' || true)"
  if [[ -n "${first_fps}" ]]; then
    printf '%s\n' "${first_fps}"
    return 0
  fi
  printf '20\n'
}

resolve_pw_audio_target() {
  if ! command -v pw-dump >/dev/null 2>&1 || ! command -v python3 >/dev/null 2>&1; then
    return 1
  fi
  pw-dump | python3 -c '
import json
import sys

try:
    objs = json.load(sys.stdin)
except Exception:
    raise SystemExit(1)

for obj in objs:
    if obj.get("type") != "PipeWire:Interface:Node":
        continue
    props = (obj.get("info") or {}).get("props") or {}
    if props.get("media.class") != "Audio/Source":
        continue
    serial = props.get("object.serial")
    name = props.get("node.name", "")
    desc = props.get("node.description", "")
    if serial is None:
        continue
    if "Lesavka_Composite" in name or "Lesavka Composite" in desc:
        print(serial)
        raise SystemExit(0)

raise SystemExit(1)
'
}

capture_mode="alsa"
alsa_audio_dev="hw:3,0"
pulse_source=""
pw_audio_target=""

case "${remote_capture_stack}" in
  auto)
    if [[ "${remote_audio_source}" == "auto" ]]; then
      if pulse_source="$(resolve_pulse_source)"; then
        capture_mode="pulse"
      elif alsa_audio_dev="$(resolve_alsa_audio_device)"; then
        capture_mode="alsa"
        printf 'PipeWire Lesavka source not found; falling back to ALSA device %s\n' "${alsa_audio_dev}" >&2
      elif command -v pw-record >/dev/null 2>&1 \
        && command -v pw-v4l2 >/dev/null 2>&1 \
        && pw_audio_target="$(resolve_pw_audio_target)"; then
        capture_mode="pwpipe"
      else
        printf 'Lesavka audio source not found in PipeWire or ALSA; capture host does not currently expose the gadget microphone.\n' >&2
        exit 64
      fi
    elif [[ "${remote_audio_source}" == pulse:* ]]; then
      capture_mode="pulse"
      pulse_source="${remote_audio_source#pulse:}"
    elif [[ "${remote_audio_source}" == alsa:* ]]; then
      alsa_audio_dev="${remote_audio_source#alsa:}"
    else
      printf 'unsupported REMOTE_AUDIO_SOURCE=%s\n' "${remote_audio_source}" >&2
      exit 64
    fi
    ;;
  pwpipe)
    if ! command -v pw-record >/dev/null 2>&1 || ! command -v pw-v4l2 >/dev/null 2>&1; then
      printf 'REMOTE_CAPTURE_STACK=pwpipe requires pw-record and pw-v4l2\n' >&2
      exit 64
    fi
    pw_audio_target="$(resolve_pw_audio_target)" || {
      printf 'PipeWire Lesavka capture target not found for REMOTE_CAPTURE_STACK=pwpipe\n' >&2
      exit 64
    }
    capture_mode="pwpipe"
    ;;
  pulse)
    if [[ "${remote_audio_source}" == pulse:* ]]; then
      pulse_source="${remote_audio_source#pulse:}"
    elif [[ "${remote_audio_source}" == "auto" ]]; then
      pulse_source="$(resolve_pulse_source)" || {
        printf 'PipeWire Lesavka source not found for REMOTE_CAPTURE_STACK=pulse\n' >&2
        exit 64
      }
    else
      pulse_source="${remote_audio_source}"
    fi
    capture_mode="pulse"
    ;;
  alsa)
    if [[ "${remote_audio_source}" == alsa:* ]]; then
      alsa_audio_dev="${remote_audio_source#alsa:}"
    elif [[ "${remote_audio_source}" != "auto" ]]; then
      alsa_audio_dev="${remote_audio_source}"
    fi
    capture_mode="alsa"
    ;;
  *)
    printf 'unsupported REMOTE_CAPTURE_STACK=%s\n' "${remote_capture_stack}" >&2
    exit 64
    ;;
esac

resolved_video_device="$(resolve_video_device "${remote_video_device}")"
resolved_video_size="$(resolve_video_size "${video_size}")"
resolved_video_fps="$(resolve_video_fps "${video_fps}")"
printf 'using video device: %s\n' "${resolved_video_device}" >&2
printf 'using video mode: %s @ %s fps (%s)\n' "${resolved_video_size}" "${resolved_video_fps}" "${video_format:-driver-default}" >&2
printf '%s\n' "__LESAVKA_CAPTURE_READY__"
video_args=(-f video4linux2 -framerate "${resolved_video_fps}" -video_size "${resolved_video_size}")
if [[ -n "${video_format}" ]]; then
  video_args+=(-input_format "${video_format}")
fi
gst_source_caps="$(gst_video_source_caps)"
gst_decode_chain="$(gst_video_decode_chain)"

run_ffmpeg_capture() {
  local rc=0
  timeout --signal=INT "$((capture_seconds + 5))" "$@" || rc=$?
  case "${rc}" in
    0|124|130)
      return 0
      ;;
    *)
      return "${rc}"
      ;;
  esac
}

quiesce_for_alsa=0
case "${remote_audio_quiesce_user_audio}" in
  1|true|yes)
    quiesce_for_alsa=1
    ;;
  auto)
    if [[ "${capture_mode}" == "alsa" ]]; then
      quiesce_for_alsa=1
    fi
    ;;
  0|false|no)
    quiesce_for_alsa=0
    ;;
  *)
    printf 'unsupported REMOTE_AUDIO_QUIESCE_USER_AUDIO=%s\n' "${remote_audio_quiesce_user_audio}" >&2
    exit 64
    ;;
esac

if [[ "${capture_mode}" == "alsa" && "${quiesce_for_alsa}" == "1" ]]; then
  printf 'quiescing Tethys user audio before raw ALSA capture\n' >&2
  quiesce_user_audio
  trap restore_user_audio EXIT
fi

if [[ "${capture_mode}" == "pwpipe" ]]; then
  printf 'using PipeWire-native mux capture target serial: %s\n' "${pw_audio_target}" >&2
  timeout "${capture_seconds}" pw-record \
    --target "${pw_audio_target}" \
    --rate 48000 \
    --channels 2 \
    --format s16 \
    --raw - \
    | pw-v4l2 ffmpeg -hide_banner -loglevel error -y \
      -thread_queue_size 1024 \
      "${video_args[@]}" \
      -i "${resolved_video_device}" \
      -thread_queue_size 1024 \
      -f s16le -ar 48000 -ac 2 \
      -i pipe:0 \
      -t "${capture_seconds}" \
      -c:v copy \
      -c:a pcm_s16le \
      "${remote_capture}"
elif [[ "${capture_mode}" == "pulse" ]]; then
  printf 'using Pulse source: %s\n' "${pulse_source}" >&2
  case "${remote_pulse_capture_tool}" in
    ffmpeg)
      case "${remote_pulse_video_mode}" in
        copy)
          run_ffmpeg_capture ffmpeg -hide_banner -loglevel error -y \
            -thread_queue_size 1024 \
            "${video_args[@]}" \
            -i "${resolved_video_device}" \
            -thread_queue_size 1024 \
            -f pulse \
            -i "${pulse_source}" \
            -t "${capture_seconds}" \
            -c:v copy \
            -c:a pcm_s16le \
            "${remote_capture}"
          ;;
        cfr)
          run_ffmpeg_capture ffmpeg -hide_banner -loglevel error -y \
            -thread_queue_size 1024 \
            "${video_args[@]}" \
            -i "${resolved_video_device}" \
            -thread_queue_size 1024 \
            -f pulse \
            -i "${pulse_source}" \
            -t "${capture_seconds}" \
            -vf "fps=${resolved_video_fps}" \
            -c:v libx264 -preset ultrafast -crf 12 -g 1 -pix_fmt yuv420p \
            -c:a pcm_s16le \
            "${remote_capture}"
          ;;
        *)
          printf 'unsupported REMOTE_PULSE_VIDEO_MODE=%s\n' "${remote_pulse_video_mode}" >&2
          exit 64
          ;;
      esac
      ;;
    gst)
      case "${remote_pulse_video_mode}" in
        copy)
          if [[ "${video_format}" != "mjpeg" && "${video_format}" != "MJPG" && -n "${video_format}" ]]; then
            printf 'gst copy mode only supports mjpeg input, got %s\n' "${video_format}" >&2
            exit 64
          fi
          timeout --signal=INT "$((capture_seconds + 3))" \
            gst-launch-1.0 -q -e \
              matroskamux name=mux ! filesink location="${remote_capture}" \
              v4l2src device="${resolved_video_device}" do-timestamp=true ! \
                ${gst_source_caps} ! \
                queue ! mux. \
              pulsesrc device="${pulse_source}" do-timestamp=true ! \
                audio/x-raw,rate=48000,channels=2 ! \
                audioconvert ! audioresample ! queue ! mux. || true
          ;;
        cfr)
          timeout --signal=INT "$((capture_seconds + 3))" \
            gst-launch-1.0 -q -e \
              matroskamux name=mux ! filesink location="${remote_capture}" \
              v4l2src device="${resolved_video_device}" do-timestamp=true ! \
                ${gst_source_caps} ! \
                ${gst_decode_chain} \
                videoconvert ! videorate ! video/x-raw,framerate="${video_fps}"/1 ! \
                x264enc tune=zerolatency speed-preset=ultrafast key-int-max=1 bitrate=5000 ! \
                h264parse ! \
                queue ! mux. \
              pulsesrc device="${pulse_source}" do-timestamp=true ! \
                audio/x-raw,rate=48000,channels=2 ! \
                audioconvert ! audioresample ! queue ! mux. || true
          ;;
        *)
          printf 'unsupported REMOTE_PULSE_VIDEO_MODE=%s\n' "${remote_pulse_video_mode}" >&2
          exit 64
          ;;
      esac
      ;;
    *)
      printf 'unsupported REMOTE_PULSE_CAPTURE_TOOL=%s\n' "${remote_pulse_capture_tool}" >&2
      exit 64
      ;;
  esac
else
  run_ffmpeg_capture ffmpeg -hide_banner -loglevel error -y \
    -thread_queue_size 1024 \
    "${video_args[@]}" \
    -i "${resolved_video_device}" \
    -thread_queue_size 1024 \
    -f alsa -ac 2 -ar 48000 \
    -i "${alsa_audio_dev}" \
    -t "${capture_seconds}" \
    -c:v ffv1 -level 3 -g 1 \
    -c:a pcm_s16le \
    "${remote_capture}"
fi
REMOTE_CAPTURE_SCRIPT
capture_pid=$!

wait_for_capture_ready() {
  local tries=100
  local i=0
  while (( i < tries )); do
    if [[ -f "${LOCAL_CAPTURE_LOG}" ]] && grep -q "${CAPTURE_READY_MARKER}" "${LOCAL_CAPTURE_LOG}"; then
      return 0
    fi
    if ! kill -0 "${capture_pid}" >/dev/null 2>&1; then
      capture_status=0
      wait "${capture_pid}" || capture_status=$?
      echo "Tethys capture failed before the sync probe could start; see ${LOCAL_CAPTURE_LOG} for details." >&2
      exit "${capture_status}"
    fi
    sleep 0.1
    ((i += 1))
  done

  echo "Timed out waiting for Tethys capture to become ready; see ${LOCAL_CAPTURE_LOG} for details." >&2
  exit 90
}

wait_for_capture_ready

sleep "${LEAD_IN_SECONDS}"

echo "==> running local Lesavka sync probe against ${RESOLVED_LESAVKA_SERVER_ADDR}"
probe_status=0
probe_timed_out=0
(
  cd "${REPO_ROOT}"
  LESAVKA_TLS_DOMAIN="${LESAVKA_TLS_DOMAIN}" \
    timeout --signal=INT "${PROBE_TIMEOUT_SECONDS}" "${PROBE_BIN}" \
    --server "${RESOLVED_LESAVKA_SERVER_ADDR}" \
    --duration-seconds "${PROBE_DURATION_SECONDS}" \
    --warmup-seconds "${PROBE_WARMUP_SECONDS}"
) || probe_status=$?
if [[ "${probe_status}" -eq 124 ]]; then
  probe_timed_out=1
fi

capture_status=0
wait "${capture_pid}" || capture_status=$?
capture_v4l2_fault=0
if [[ -f "${LOCAL_CAPTURE_LOG}" ]] \
  && grep -q 'VIDIOC_QBUF): Bad file descriptor' "${LOCAL_CAPTURE_LOG}"; then
  capture_v4l2_fault=1
fi
capture_streamon_timeout=0
if [[ -f "${LOCAL_CAPTURE_LOG}" ]] \
  && grep -q 'VIDIOC_STREAMON.*Connection timed out' "${LOCAL_CAPTURE_LOG}"; then
  capture_streamon_timeout=1
fi

if ssh ${SSH_OPTS} "${TETHYS_HOST}" "test -f '${REMOTE_CAPTURE}'"; then
  remote_fetch_capture="${REMOTE_CAPTURE}"
  if [[ "${ANALYSIS_NORMALIZE}" != "0" ]]; then
    remote_fetch_capture="${REMOTE_CAPTURE%.mkv}-analysis.mkv"
    echo "==> normalizing remote capture to CFR for analysis"
    normalize_status=0
    ssh ${SSH_OPTS} "${TETHYS_HOST}" bash -s -- \
      "${REMOTE_CAPTURE}" \
      "${remote_fetch_capture}" \
      "${VIDEO_FPS}" \
      "${ANALYSIS_SCALE_WIDTH}" <<'REMOTE_NORMALIZE_SCRIPT' || normalize_status=$?
set -euo pipefail
src=$1
dst=$2
fps=$3
scale_width=$4
ffmpeg -hide_banner -loglevel error -y \
  -i "${src}" \
  -vf "fps=${fps},scale='min(${scale_width},iw)':-2" \
  -c:v libx264 -preset ultrafast -crf 12 -g 1 -pix_fmt yuv420p \
  -c:a pcm_s16le \
  "${dst}"
REMOTE_NORMALIZE_SCRIPT
    if [[ "${normalize_status}" -ne 0 ]]; then
      echo "remote CFR normalization failed; falling back to raw capture" >&2
      remote_fetch_capture="${REMOTE_CAPTURE}"
    fi
  fi

  if [[ "${REMOTE_ANALYZE}" != "0" ]]; then
    if [[ "${REMOTE_ANALYZE_COPY}" != "0" ]]; then
      echo "==> copying sync analyzer to ${TETHYS_HOST}:${REMOTE_ANALYZE_BIN}"
      scp ${SSH_OPTS} "${ANALYZE_BIN}" "${TETHYS_HOST}:${REMOTE_ANALYZE_BIN}"
    fi
    echo "==> analyzing capture on ${TETHYS_HOST}"
    ssh ${SSH_OPTS} "${TETHYS_HOST}" \
      "chmod +x '${REMOTE_ANALYZE_BIN}' && '${REMOTE_ANALYZE_BIN}' '${remote_fetch_capture}' --json" \
      > "${LOCAL_ANALYSIS_JSON}"
  fi

  if [[ "${FETCH_CAPTURE}" != "0" ]]; then
    echo "==> fetching capture back to ${LOCAL_CAPTURE}"
    scp ${SSH_OPTS} "${TETHYS_HOST}:${remote_fetch_capture}" "${LOCAL_CAPTURE}"
  fi
fi

if [[ "${probe_status}" -ne 0 ]]; then
  if [[ "${probe_timed_out}" -eq 1 ]]; then
    echo "sync probe timed out after ${PROBE_TIMEOUT_SECONDS}s; this usually means one upstream stream did not close cleanly after capture starvation." >&2
  fi
  echo "sync probe failed with status ${probe_status}" >&2
  [[ -f "${LOCAL_CAPTURE}" ]] && echo "partial capture preserved at ${LOCAL_CAPTURE}" >&2
  exit "${probe_status}"
fi
if [[ "${capture_status}" -ne 0 ]]; then
  if [[ "${capture_streamon_timeout}" -eq 1 ]]; then
    echo "Tethys capture timed out during VIDIOC_STREAMON; the UVC host opened before MJPEG frames reached the gadget." >&2
    echo "Keep LEAD_IN_SECONDS=0 and restart lesavka-uvc/lesavka-server before retrying if the gadget is wedged from an earlier failed run." >&2
  fi
  if [[ "${capture_status}" -eq 141 && ( -f "${LOCAL_CAPTURE}" || -f "${LOCAL_ANALYSIS_JSON}" ) ]]; then
    echo "Tethys capture ended with PipeWire SIGPIPE after ffmpeg closed; accepting preserved analysis artifacts" >&2
  elif [[ "${capture_status}" -eq 124 && ( -f "${LOCAL_CAPTURE}" || -f "${LOCAL_ANALYSIS_JSON}" ) ]]; then
    echo "Tethys capture timed out after preserving analysis artifacts; accepting the run for analysis" >&2
  else
  echo "Tethys capture failed with status ${capture_status}" >&2
  [[ -f "${LOCAL_CAPTURE}" ]] && echo "partial capture preserved at ${LOCAL_CAPTURE}" >&2
  exit "${capture_status}"
  fi
fi

if [[ "${REMOTE_ANALYZE}" != "0" ]]; then
  if [[ ! -f "${LOCAL_ANALYSIS_JSON}" ]]; then
    echo "remote analysis did not produce ${LOCAL_ANALYSIS_JSON}" >&2
    exit 92
  fi
  echo "==> remote analysis summary"
  python - <<'PY' "${LOCAL_ANALYSIS_JSON}" "${LOCAL_REPORT_TXT}" "${LOCAL_EVENTS_CSV}"
import csv
import json
import pathlib
import sys

report = json.loads(pathlib.Path(sys.argv[1]).read_text())
verdict = report.get('verdict', {})
cal = report.get('calibration', {})
lines = [
    f"A/V sync report for {sys.argv[1]}",
    f"- verdict: {verdict.get('status', 'unknown')} ({'pass' if verdict.get('passed') else 'fail'})",
    f"- verdict reason: {verdict.get('reason', '')}",
    f"- p95 abs skew: {float(verdict.get('p95_abs_skew_ms', 0.0)):.1f} ms",
    f"- video onsets: {report['video_event_count']}",
    f"- audio onsets: {report['audio_event_count']}",
    f"- paired pulses: {report['paired_event_count']}",
    f"- activity start delta: {report.get('activity_start_delta_ms', 0.0):+.1f} ms (audio after video is positive)",
    f"- first skew: {report['first_skew_ms']:+.1f} ms (audio after video is positive)",
    f"- last skew: {report['last_skew_ms']:+.1f} ms",
    f"- mean skew: {report['mean_skew_ms']:+.1f} ms",
    f"- median skew: {report['median_skew_ms']:+.1f} ms",
    f"- max abs skew: {report['max_abs_skew_ms']:.1f} ms",
    f"- drift: {report['drift_ms']:+.1f} ms",
    f"- calibration ready: {cal.get('ready')}",
    f"- recommended audio offset adjust: {int(cal.get('recommended_audio_offset_adjust_us', 0)):+d} us",
    f"- alternative video offset adjust: {int(cal.get('recommended_video_offset_adjust_us', 0)):+d} us",
    f"- calibration note: {cal.get('note', '')}",
]
summary = "\n".join(lines) + "\n"
pathlib.Path(sys.argv[2]).write_text(summary)
with pathlib.Path(sys.argv[3]).open("w", newline="") as handle:
    writer = csv.DictWriter(
        handle,
        fieldnames=["event_id", "video_time_s", "audio_time_s", "skew_ms", "confidence"],
    )
    writer.writeheader()
    for event in report.get("paired_events", []):
        writer.writerow({
            "event_id": event.get("event_id"),
            "video_time_s": event.get("video_time_s"),
            "audio_time_s": event.get("audio_time_s"),
            "skew_ms": event.get("skew_ms"),
            "confidence": event.get("confidence"),
        })
print(summary, end="")
PY
else
  if [[ ! -f "${LOCAL_CAPTURE}" ]]; then
    echo "capture was not fetched and REMOTE_ANALYZE=0 left nothing local to analyze" >&2
    exit 93
  fi
  echo "==> analyzing capture"
  (
    cd "${REPO_ROOT}"
    "${ANALYZE_BIN}" "${LOCAL_CAPTURE}" --report-dir "${LOCAL_REPORT_DIR}"
  )
fi

if [[ "${capture_v4l2_fault}" -eq 1 ]]; then
  echo "warning: Tethys video capture reported VIDIOC_QBUF / Bad file descriptor; treat unstable skew or analyzer failures as host-capture suspect" >&2
fi

echo "==> done"
echo "artifact_dir: ${LOCAL_REPORT_DIR}"
if [[ -f "${LOCAL_CAPTURE}" ]]; then
  echo "capture: ${LOCAL_CAPTURE}"
fi
if [[ -f "${LOCAL_ANALYSIS_JSON}" ]]; then
  echo "report_json: ${LOCAL_ANALYSIS_JSON}"
fi
if [[ -f "${LOCAL_REPORT_TXT}" ]]; then
  echo "report_txt: ${LOCAL_REPORT_TXT}"
fi
if [[ -f "${LOCAL_EVENTS_CSV}" ]]; then
  echo "events_csv: ${LOCAL_EVENTS_CSV}"
fi
if [[ -f "${LOCAL_CAPTURE_LOG}" ]]; then
  echo "capture_log: ${LOCAL_CAPTURE_LOG}"
fi