#!/usr/bin/env bash
# deploy/lib/common.sh — 比特骆驼自动化对冲系统 部署公共函数
# 目标系统: Ubuntu 22.04 LTS
set -e
set -u
if [ -n "${BASH_VERSION:-}" ]; then
  set -o pipefail
fi

INSTALL_ROOT="${INSTALL_ROOT:-/opt/eth_hedge_sim}"
GIT_URL="${GIT_URL:-https://git.bz121.com/dekun/eth_hedge_sim.git}"
GIT_BRANCH="${GIT_BRANCH:-main}"
BACKUP_ROOT="${BACKUP_ROOT:-/root/backups/eth_hedge_sim}"
TZ_NAME="${EHS_TZ:-Asia/Shanghai}"
NODE_MAJOR="${NODE_MAJOR:-20}"
PM2_APP_NAME="${PM2_APP_NAME:-eth-hedge-api}"
API_PORT="${API_PORT:-5155}"

LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DEPLOY_DIR="$(cd "${LIB_DIR}/.." && pwd)"
REPO_ROOT="$(cd "${DEPLOY_DIR}/.." && pwd)"

log() { printf '[%s] %s\n' "$(TZ="${TZ_NAME}" date '+%Y-%m-%d %H:%M:%S')" "$*"; }
step() { echo ""; log "==> $*"; }

die() {
  echo "错误: $*" >&2
  exit 1
}

require_root() {
  if [[ "$(id -u)" -ne 0 ]]; then
    die "请使用 root 执行(推荐: sudo -i 后运行)"
  fi
}

detect_server_ip() {
  local ip=""
  if command -v hostname >/dev/null 2>&1; then
    ip="$(hostname -I 2>/dev/null | awk '{print $1}')"
  fi
  if [[ -z "${ip}" ]]; then
    ip="127.0.0.1"
  fi
  echo "${ip}"
}

# curl|bash 时 stdin 可能是管道，交互从 /dev/tty 读
cm_read() {
  local __var="$1"
  local __prompt="${2:-}"
  local __line=""
  if [[ -n "${__prompt}" ]]; then
    printf '%s' "${__prompt}" >/dev/tty 2>/dev/null || printf '%s' "${__prompt}"
  fi
  if [[ -r /dev/tty ]]; then
    IFS= read -r __line </dev/tty || true
  else
    IFS= read -r __line || true
  fi
  printf -v "${__var}" '%s' "${__line}"
}

confirm_yes() {
  local msg="$1"
  local ans=""
  cm_read ans "${msg} [y/N] "
  [[ "${ans}" == [yY] || "${ans}" == [yY][eE][sS] ]]
}

repo_ready() {
  [[ -f "${1}/deploy/manage.sh" && -f "${1}/deploy/pull_and_restart.sh" ]]
}

resolve_repo_root() {
  if repo_ready "${INSTALL_ROOT}"; then
    echo "${INSTALL_ROOT}"
    return 0
  fi
  if [[ -n "${REPO_ROOT:-}" ]] && repo_ready "${REPO_ROOT}"; then
    echo "${REPO_ROOT}"
    return 0
  fi
  return 1
}

ensure_system_deps() {
  step "检查系统依赖"
  export DEBIAN_FRONTEND=noninteractive
  if command -v apt-get >/dev/null 2>&1; then
    apt-get update -qq
    apt-get install -y git ca-certificates curl python3 python3-venv python3-pip
  fi
  if ! command -v node >/dev/null 2>&1; then
    step "安装 Node.js ${NODE_MAJOR}"
    curl -fsSL "https://deb.nodesource.com/setup_${NODE_MAJOR}.x" | bash -
    apt-get install -y nodejs
  fi
  if ! command -v pm2 >/dev/null 2>&1; then
    step "安装 PM2"
    npm install -g pm2
  fi
}

pm2_stop_project() {
  if command -v pm2 >/dev/null 2>&1; then
    pm2 stop "${PM2_APP_NAME}" 2>/dev/null || true
  fi
}

pm2_delete_project() {
  if command -v pm2 >/dev/null 2>&1; then
    pm2 delete "${PM2_APP_NAME}" 2>/dev/null || true
    pm2 save 2>/dev/null || true
  fi
}

pm2_save_startup() {
  if command -v pm2 >/dev/null 2>&1; then
    pm2 save 2>/dev/null || true
    pm2 startup systemd -u root --hp /root 2>/dev/null || true
  fi
}

verify_health() {
  local port="${1:-${API_PORT}}"
  local url="http://127.0.0.1:${port}/health"
  step "健康检查 ${url}"
  local i
  for i in 1 2 3 4 5 6 7 8 9 10; do
    if curl -fsS "${url}" >/dev/null 2>&1; then
      log "health OK"
      curl -fsS "${url}" || true
      echo ""
      return 0
    fi
    sleep 1
  done
  log "警告: health 暂未就绪，请稍后检查 pm2 logs ${PM2_APP_NAME}"
  return 1
}

print_post_install_guide() {
  local ip
  ip="$(detect_server_ip)"
  echo ""
  echo "══════════════════════════════════════"
  echo " 比特骆驼自动化对冲系统 部署完成"
  echo " 目录: ${INSTALL_ROOT}"
  echo " 本机: http://${ip}:${API_PORT}/health"
  echo " 进程: pm2 status  →  ${PM2_APP_NAME}"
  echo " 管理: bash ${INSTALL_ROOT}/deploy/manage.sh"
  echo " 配置: ${INSTALL_ROOT}/.env"
  echo "══════════════════════════════════════"
  echo ""
}