#!/usr/bin/env bash
# Shared bootstrap: ROOT, env defaults, encoding presets, pipe helpers.
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
export ROOT

# shellcheck disable=SC1091
source "${ROOT}/lib/logging.sh"
# shellcheck disable=SC1091
source "${ROOT}/lib/env.sh"

apply_encoding_preset() {
  case "${OUTPUT_PRESET}" in
    720p)
      WIDTH=1280
      HEIGHT=720
      FASTNESS=veryfast
      BV=2500k
      BUFSIZE=5000k
      ;;
    1080p|*)
      WIDTH=1920
      HEIGHT=1080
      FASTNESS=faster
      BV=5000k
      BUFSIZE=10000k
      ;;
  esac
  export WIDTH HEIGHT FASTNESS BV BUFSIZE
  RES="${WIDTH}x${HEIGHT}"
  PROFILE=high
  KEYFRAMES_INTL="${FPS}"
  GOP_INTL=$((KEYFRAMES_INTL * 2))
  PIX_FMT="-pix_fmt yuv420p"
  PRESET="-preset ${FASTNESS} -tune zerolatency -profile:v ${PROFILE} ${PIX_FMT} -x264-params keyint=${KEYFRAMES_INTL}:min-keyint=${KEYFRAMES_INTL} -g ${GOP_INTL} -flags +global_header"
  BITRATE="-b:v ${BV} -maxrate ${BV} -minrate ${BV}"
  VCODEC="-c:v libx264"
  ACODEC="-c:a aac -b:a 128k"
  export RES PROFILE PRESET BITRATE VCODEC ACODEC
}

apply_encoding_preset

FFMPEG_TS_FLAGS=(
  -fflags +genpts+igndts
  -avoid_negative_ts make_zero
  -sn
  -movflags +faststart
)

read_rate_flag() {
  if [[ "${NEAR_REALTIME}" == "1" ]]; then
    RE_FLAG=(-re)
  else
    RE_FLAG=()
  fi
}

ensure_storage() {
  mkdir -p "${STORAGE_DIR}" "${RUN_DIR}"
}

ensure_pipe() {
  if [[ ! -p "${PIPE_PATH}" ]]; then
    mkfifo "${PIPE_PATH}"
    if command -v perl >/dev/null 2>&1; then
      perl -MFcntl -e 'fcntl(STDIN, 1031, shift) or die $!' "${PIPE_FIFO_SIZE}" <> "${PIPE_PATH}" || true
    fi
  fi
  exec 7<> "${PIPE_PATH}"
}

remove_pipe() {
  exec 7>&- 7<&- 2>/dev/null || true
  rm -f "${PIPE_PATH}" 2>/dev/null || true
}

next_record_path() {
  local counter=0 name
  ensure_storage
  while true; do
    name="$(printf "video%04d.%s" "${counter}" "${RECORD_FORMAT}")"
    if [[ ! -f "${STORAGE_DIR}/${name}" ]]; then
      echo "${STORAGE_DIR}/${name}"
      return
    fi
    counter=$((counter + 1))
  done
}

require_cmd() {
  command -v "$1" >/dev/null 2>&1 || die "required command not found: $1"
}

require_logo() {
  [[ -f "${LOGO_PATH}" ]] || die "logo not found at ${LOGO_PATH} (expected ${ROOT}/assets/pirate_drift.png)"
}