#!/usr/bin/env bash
# ~/bin/call-recorder.sh
set -euo pipefail

REC_DIR="$HOME"
PIDFILE="/tmp/call-recorder.pid"
LOGFILE="/tmp/call-recorder.log"

start_recording() {
    if [[ -f "$PIDFILE" ]] && kill -0 "$(cat "$PIDFILE")" 2>/dev/null; then
        notify-send "Call Recorder" "Läuft bereits (PID $(cat "$PIDFILE"))"
        exit 1
    fi

    local sink source outfile
    sink="$(pactl get-default-sink).monitor"
    source="$(pactl get-default-source)"
    outfile="${REC_DIR}/call_$(date +%Y-%m-%d_%H-%M-%S).mp3"

    ffmpeg -nostdin -y \
        -f pulse -i "$sink" \
        -f pulse -i "$source" \
        -filter_complex "[0:a]pan=mono|c0=0.5*c0+0.5*c1[browser];[1:a]pan=mono|c0=c0[mic];[browser][mic]amerge=inputs=2[aout]" \
        -map "[aout]" -ac 2 -c:a libmp3lame -q:a 2 \
        "$outfile" \
        > "$LOGFILE" 2>&1 &

    echo $! > "$PIDFILE"
    notify-send "Call Recorder" "Aufnahme gestartet: $(basename "$outfile")"
}

stop_recording() {
    if [[ ! -f "$PIDFILE" ]]; then
        notify-send "Call Recorder" "Keine laufende Aufnahme."
        exit 1
    fi
    local pid
    pid="$(cat "$PIDFILE")"
    kill -INT "$pid" 2>/dev/null || true
    # ffmpeg braucht einen Moment, um den MP3-Frame sauber abzuschließen
    for _ in {1..20}; do
        kill -0 "$pid" 2>/dev/null || break
        sleep 0.2
    done
    rm -f "$PIDFILE"
    notify-send "Call Recorder" "Aufnahme gestoppt."
}

case "${1:-toggle}" in
    start)  start_recording ;;
    stop)   stop_recording ;;
    toggle) if [[ -f "$PIDFILE" ]]; then stop_recording; else start_recording; fi ;;
    *) echo "Usage: $0 {start|stop|toggle}"; exit 1 ;;
esac