#!/usr/bin/env bash
set -uo pipefail
HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
OVOW_ROOT="$(cd "$HERE/.." && pwd)"
source "$OVOW_ROOT/configs/paths.sh"
SRV_DIR="${MASKING_DIR:-$HERE}"
SAM3_PY="${SAM3_PY:-python}"
IPC_DIR="$ENGINE_DIR/tools/model_server"
QUEUE="${SAM3_SERVER_QUEUE:-/tmp/sam3_server_q}"
PIDFILE="$QUEUE/server.pid"
LOGDIR="$SRV_DIR/logs"

CMD="${1:-status}"; shift || true
GPU=6
while [[ $# -gt 0 ]]; do case "$1" in
  --gpu) GPU="$2"; shift 2;;
  *) shift;; esac; done

_server_pid() {
  if [[ -f "$PIDFILE" ]]; then
    cat "$PIDFILE" 2>/dev/null
  elif [[ -f "$QUEUE/alive" ]]; then
    cat "$QUEUE/alive" 2>/dev/null
  fi
}

_alive() {
  local pid
  pid="$(_server_pid)"
  [[ -n "$pid" ]] && [[ -f "$QUEUE/ready" ]] && kill -0 "$pid" 2>/dev/null
}

start() {
  mkdir -p "$QUEUE" "$LOGDIR"; rm -f "$QUEUE/ready"
  local log="$LOGDIR/sam3server_$(date +%Y%m%d_%H%M%S).log"
  echo "[ctl] 启动 sam3-server (gpu=$GPU queue=$QUEUE)"
  ( cd "$SRV_DIR"
    CUDA_VISIBLE_DEVICES="$GPU" \
    nohup "$SAM3_PY" "$SRV_DIR/sam3_server.py" --queue "$QUEUE" > "$log" 2>&1 &
    echo $! > "$PIDFILE" )
  echo "[ctl] pid=$(cat "$PIDFILE") log=$log,等待模型载入就绪..."
  local t0=$(date +%s)
  until [[ -f "$QUEUE/ready" ]]; do
    local pid
    pid="$(_server_pid)"
    [[ -n "$pid" ]] && kill -0 "$pid" 2>/dev/null || { echo "[ctl] 服务进程退出,见日志: $log" >&2; tail -5 "$log"; exit 1; }
    sleep 3
  done
  echo "[ctl] 就绪 (载入耗时 $(( $(date +%s) - t0 ))s)"
}

case "$CMD" in
  start) start ;;
  ensure) if _alive; then echo "[ctl] 已在跑 (pid=$(_server_pid), queue=$QUEUE)"; else start; fi ;;
  status) if _alive; then echo "RUNNING pid=$(_server_pid) queue=$QUEUE"; else echo "NOT RUNNING (queue=$QUEUE)"; fi ;;
  stop)
    if _alive; then
      "$SAM3_PY" -c "import sys;sys.path.insert(0,'$IPC_DIR');import ipc;ipc.submit('$QUEUE','shutdown',timeout=60)" 2>/dev/null || true
      sleep 2; kill "$(_server_pid)" 2>/dev/null || true
      rm -f "$QUEUE/ready" "$PIDFILE" "$QUEUE/alive"; echo "[ctl] 已停"
    else echo "[ctl] 未在跑"; fi ;;
  *) echo "用法: $0 start|ensure|status|stop [--gpu N]"; exit 1 ;;
esac