#!/bin/bash
set -euo pipefail

# Configuration
AUDIO_DEVICE="${AUDIO_DEVICE:-hw:1}"      # ALSA device (run 'arecord -l' to list)
SEGMENT_SECONDS="${SEGMENT_SECONDS:-7200}" # 2 hours per file
RECORDINGS_DIR="${RECORDINGS_DIR:-$HOME/recordings}"
SOURCE_NAME="${SOURCE_NAME:-stationary}"   # Prefix for filenames

mkdir -p "${RECORDINGS_DIR}"

echo "Starting recording..."
echo "  Device: ${AUDIO_DEVICE}"
echo "  Segment: ${SEGMENT_SECONDS}s"
echo "  Output: ${RECORDINGS_DIR}/${SOURCE_NAME}-*.opus"

while true; do
  ffmpeg -f alsa -ac 1 -i "${AUDIO_DEVICE}" \
    -c:a libopus \
    -b:a 32k \
    -f segment \
    -segment_time "${SEGMENT_SECONDS}" \
    -strftime 1 \
    -reset_timestamps 1 \
    "${RECORDINGS_DIR}/${SOURCE_NAME}-%Y-%m-%d_%H-%M-%S.opus" \
    2>&1 | while read line; do echo "[ffmpeg] $line"; done

  echo "Recording stopped, restarting in 5s..."
  sleep 5
done