"""FastAPI 入口。

启动时自动建表（MVP 用 create_all；阶段1 切 Alembic 迁移，含 TimescaleDB hypertable）。
"""
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from .api import router
from .db import Base, engine
from . import models  # noqa: F401  —— 注册 ORM 到 Base.metadata


@asynccontextmanager
async def lifespan(app: FastAPI):
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield


app = FastAPI(
    title="Stock Backtest",
    description="历史回测 + 回放式模拟平台（A 股为主，不做实盘）",
    version="0.1.0",
    lifespan=lifespan,
)

# 开发期允许前端 dev server 跨域；上线收窄 origins
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(router)


@app.get("/")
async def root() -> dict:
    return {"name": "Stock Backtest API", "docs": "/docs"}