#!/usr/bin/env bash
# 同时启动后端（FastAPI :8000）与前端（Vite :5173）。
# 端口可用 BACKEND_PORT / FRONTEND_PORT 覆盖。
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
BACKEND_PORT="${BACKEND_PORT:-8000}"
FRONTEND_PORT="${FRONTEND_PORT:-5173}"

if [[ ! -x "$ROOT_DIR/backend/.venv/bin/uvicorn" ]]; then
  echo "尚未初始化，请先运行 ./scripts/init.sh" >&2
  exit 1
fi
if [[ ! -f "$ROOT_DIR/data/math.db" ]]; then
  echo "数据库不存在，请先运行 ./scripts/init.sh" >&2
  exit 1
fi
if ! command -v node >/dev/null 2>&1; then
  echo "未找到 Node.js，前端无法启动。请安装 Node 20.19+ / 22.12+（或先只跑后端：cd backend && .venv/bin/uvicorn main:app --reload）" >&2
  exit 1
fi

# 端口占用早失败，避免 Vite 报一堆堆栈
require_free_port() {
  local port="$1" name="$2"
  command -v lsof >/dev/null 2>&1 || return 0
  if lsof -nP -iTCP:"$port" -sTCP:LISTEN >/dev/null 2>&1; then
    echo "端口 $port（$name）已被占用：" >&2
    lsof -nP -iTCP:"$port" -sTCP:LISTEN >&2 || true
    echo "请先停掉占用进程，或用 ${name}_PORT=其他端口 ./scripts/start.sh 换端口。" >&2
    exit 1
  fi
}
require_free_port "$BACKEND_PORT" BACKEND
require_free_port "$FRONTEND_PORT" FRONTEND

if [[ ! -d "$ROOT_DIR/frontend/node_modules" ]]; then
  echo "[start] 安装前端依赖…"
  (cd "$ROOT_DIR/frontend" && npm install)
fi

BACKEND_PID=""
cleanup() {
  if [[ -n "$BACKEND_PID" ]]; then
    kill "$BACKEND_PID" 2>/dev/null || true
  fi
}
trap cleanup EXIT INT TERM

echo "[start] 后端：http://localhost:${BACKEND_PORT}/api/health"
(cd "$ROOT_DIR/backend" && exec .venv/bin/uvicorn main:app \
  --host 0.0.0.0 --port "${BACKEND_PORT}" --reload) &
BACKEND_PID=$!

echo "[start] 前端：http://localhost:${FRONTEND_PORT}"
(cd "$ROOT_DIR/frontend" && exec npm run dev -- \
  --host 0.0.0.0 --port "${FRONTEND_PORT}")