#!/usr/bin/env sh
# Push-to-talk dictation. Toggle: 1st invocation starts recording;
# 2nd stops, transcribes via whisper.cpp, types the result into the focused
# window with wtype, and copies it to the clipboard.
#
# Pacman:  pipewire-pulse (parecord), wtype, wl-clipboard, libnotify
# AUR:     whisper.cpp, whisper.cpp-model-large-v3-turbo-q5_0
#
# Override via env:
#   WHISPER_MODEL  path to a ggml-*.bin model
#   WHISPER_LANG   language code or 'auto' (default: auto)

set -eu

state_dir="${XDG_RUNTIME_DIR:-/tmp}/dictate"
pid_file="$state_dir/pid"
wav_file="$state_dir/audio.wav"
log_file="$state_dir/whisper.log"
default_model='/usr/share/whisper.cpp-model-base/ggml-base.bin'
model="${WHISPER_MODEL:-$default_model}"
lang="${WHISPER_LANG:-auto}"

mkdir -p "$state_dir"

is_recording() {
  [ -r "$pid_file" ] && kill -0 "$(cat "$pid_file")" 2>/dev/null
}

start_recording() {
  if ! command -v whisper-cli >/dev/null; then
    notify-send -u critical "🎙️ dictate" \
      "whisper-cli not found. Install whisper.cpp (AUR)."
    exit 1
  fi
  if [ ! -r "$model" ]; then
    notify-send -u critical "🎙️ dictate" \
      "Model missing: $model. Install whisper.cpp-model-base (AUR)."
    exit 1
  fi
  rm -f "$wav_file"
  parecord --format=s16le --rate=16000 --channels=1 "$wav_file" \
    >"$log_file" 2>&1 &
  echo "$!" >"$pid_file"
  notify-send -t 1500 "🎙️ Recording…" "Press the bind again to stop."
}

stop_and_transcribe() {
  pid="$(cat "$pid_file")"
  rm -f "$pid_file"
  kill -TERM "$pid" 2>/dev/null || true
  # Give parecord up to 2s to flush the WAV header.
  i=0
  while kill -0 "$pid" 2>/dev/null && [ "$i" -lt 20 ]; do
    sleep 0.1
    i=$((i + 1))
  done
  kill -KILL "$pid" 2>/dev/null || true

  if [ ! -s "$wav_file" ]; then
    notify-send -u low "🎙️ dictate" "No audio captured."
    exit 1
  fi

  notify-send -t 1500 "🎙️ Transcribing…"

  text="$(
    whisper-cli -m "$model" -f "$wav_file" \
      -l "$lang" -nt -np -t "$(nproc)" 2>"$log_file" |
      tr -s '[:space:]' ' ' |
      sed -e 's/^ //; s/ $//'
  )"

  if [ -z "$text" ]; then
    notify-send -u low "🎙️ dictate" "Empty transcription. See $log_file."
    exit 1
  fi

  printf '%s' "$text" | wl-copy
  wtype -- "$text"
  notify-send -t 2500 "🎙️ Dictated" "$text"
}

if is_recording; then
  stop_and_transcribe
else
  start_recording
fi