#!/bin/bash
# Persistent multi-camera capture with zero-gap segmentation
# Condenses each completed segment automatically
# Usage: ipcam-record.sh [cameras.conf]
CONF="${1:-$(dirname "$0")/ipcam-cameras.conf}"
DIR="$HOME/Downloads/ipcam"
SEGMENT=600
PIDFILE="$DIR/.capture.pids"
CONDENSE="$(dirname "$0")/ipcam-condense.sh"
MERGE="$(dirname "$0")/ipcam-merge.sh"

mkdir -p "$DIR"

cleanup() {
  if [ -f "$PIDFILE" ]; then
    while read pid; do
      kill "$pid" 2>/dev/null
    done < "$PIDFILE"
    rm "$PIDFILE"
  fi
  exit 0
}
trap cleanup INT TERM

> "$PIDFILE"

# launch one ffmpeg per camera
while read -r name url; do
  [ -z "$name" ] && continue
  [[ "$name" == \#* ]] && continue

  (
    while true; do
      ffmpeg -loglevel error \
        -vaapi_device /dev/dri/renderD128 \
        -i "$url" \
        -vf "drawtext=text='%{localtime\:%Y-%m-%d %T %Z}':fontsize=28:fontcolor=white:borderw=2:bordercolor=black:x=24:y=h-48,format=nv12,hwupload" \
        -c:v h264_vaapi -qp 18 \
        -f segment \
        -segment_time "$SEGMENT" \
        -segment_format matroska \
        -reset_timestamps 1 \
        -strftime 1 \
        -segment_list pipe:1 \
        -segment_list_type flat \
        "$DIR/${name}_%Y%m%d_%H%M%S.mkv" \
        </dev/null 2>/dev/null |
      while read -r completed; do
        [ -z "$completed" ] && continue
        # segment_list outputs bare filename, add dir
        f="$DIR/$completed"
        [ -f "$f" ] || continue
        echo "segment complete: $completed, condensing..."
        bash "$CONDENSE" "$f" && bash "$MERGE"
      done
      # if ffmpeg dies (camera offline), retry after 5s
      sleep 5
    done
  ) &
  echo $! >> "$PIDFILE"
  echo "started capture: $name ($url) pid=$!"

done < "$CONF"

echo "all cameras started, waiting..."
wait