#!/usr/bin/env bash
# OCR Worker 共用函数：同机 GPU 识别 + screen 常驻
OCR_SCREEN_NAME="${OCR_SCREEN_NAME:-ocr-worker}"
OCR_PORT="${OCR_PORT:-23567}"

ocr_worker_dir() {
  echo "${INSTALL_DIR}/deploy/ocr-worker"
}

detect_ocr_use_gpu() {
  if [[ "${OCR_USE_GPU:-auto}" == "false" ]]; then
    echo "false"
    return
  fi
  if [[ "${OCR_USE_GPU:-auto}" == "true" ]]; then
    if ldconfig -p 2>/dev/null | grep -q libcudnn; then
      echo "true"
    else
      log_warn "未检测到 cuDNN 库，GPU OCR 不可用，改用 CPU"
      echo "false"
    fi
    return
  fi
  # auto
  if command -v nvidia-smi >/dev/null && ldconfig -p 2>/dev/null | grep -q libcudnn; then
    echo "true"
  else
    echo "false"
  fi
}

install_ocr_worker() {
  local worker_dir
  worker_dir="$(ocr_worker_dir)"
  if [[ ! -d "${worker_dir}" ]]; then
    log_error "未找到 ${worker_dir}"
    return 1
  fi
  log_info "安装/更新 OCR Worker (RapidOCR/ONNX)…"
  chmod +x "${worker_dir}"/*.sh 2>/dev/null || true
  OCR_PORT="${OCR_PORT}" bash "${worker_dir}/install.sh"
}

ocr_screen_running() {
  screen -list 2>/dev/null | grep -q "\.${OCR_SCREEN_NAME}[[:space:]]"
}

start_ocr_screen() {
  local worker_dir log_file
  worker_dir="$(ocr_worker_dir)"
  if [[ ! -x "${worker_dir}/.venv/bin/uvicorn" ]]; then
    log_warn "OCR Worker 未安装，跳过 screen 启动"
    return 1
  fi
  if ! command -v screen >/dev/null; then
    log_error "未安装 screen，请 apt install screen"
    return 1
  fi

  log_info "启动 OCR Worker → screen「${OCR_SCREEN_NAME}」(RapidOCR, 端口 ${OCR_PORT})"
  if ocr_screen_running; then
    screen -S "${OCR_SCREEN_NAME}" -X quit 2>/dev/null || true
    sleep 1
  fi

  mkdir -p "${INSTALL_DIR}/logs" 2>/dev/null || true
  log_file="${INSTALL_DIR}/logs/ocr-worker.log"

  screen -dmS "${OCR_SCREEN_NAME}" bash -c "
    cd '${worker_dir}' &&
    export OCR_PORT='${OCR_PORT}' OCR_HOST=0.0.0.0 &&
    exec bash run.sh >> '${log_file}' 2>&1
  "
  sleep 2
  log_info "OCR 日志: ${log_file}"
}

stop_ocr_screen() {
  if ocr_screen_running; then
    log_info "停止 OCR screen 会话…"
    screen -S "${OCR_SCREEN_NAME}" -X quit 2>/dev/null || true
  fi
}

wait_ocr_healthy() {
  local max="${1:-30}"
  local i
  log_info "等待 OCR 就绪（最多 ${max}×2 秒，首次加载模型较慢）…"
  for i in $(seq 1 "${max}"); do
    if curl -sf "http://127.0.0.1:${OCR_PORT}/health" >/dev/null 2>&1; then
      log_info "OCR 健康检查通过 — http://127.0.0.1:${OCR_PORT}/health"
      return 0
    fi
    if (( i % 5 == 0 )); then
      echo -ne "\r${YELLOW}[INFO]${NC} 仍在等待 OCR… ${i}/${max}（可另开终端: tail -f ${INSTALL_DIR}/logs/ocr-worker.log）"
    fi
    sleep 2
  done
  echo ""
  log_warn "OCR 尚未响应（可能仍在下载/加载模型，主程序可先继续）"
  log_warn "稍后执行: bash ${INSTALL_DIR}/deploy/ocr-screen.sh status"
  return 1
}

show_ocr_status() {
  echo ""
  echo "--- OCR Worker (screen: ${OCR_SCREEN_NAME}) ---"
  if ocr_screen_running; then
    echo "screen: 运行中"
    screen -list 2>/dev/null | grep "${OCR_SCREEN_NAME}" || true
  else
    echo "screen: 未运行"
  fi
  if curl -sf "http://127.0.0.1:${OCR_PORT}/health" 2>/dev/null; then
    echo ""
  else
    echo "health: 无响应 (http://127.0.0.1:${OCR_PORT}/health)"
  fi
  if command -v nvidia-smi >/dev/null; then
    nvidia-smi --query-gpu=name,memory.used,memory.total,utilization.gpu --format=csv,noheader 2>/dev/null || true
  fi
}