from __future__ import annotations

import asyncio
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from app.logging_config import setup_logging
from app.db import init_db
from app.routers import biomass, ingest
from app.services.action_watch import run_action_watch_loop
from app.services.measure_watch import run_measure_watch_loop
from app.settings import get_settings

setup_logging()


@asynccontextmanager
async def lifespan(app: FastAPI):
    setup_logging()
    s = get_settings()
    init_db(s)
    s.media_root.mkdir(parents=True, exist_ok=True)
    s.stream_tmp_dir.mkdir(parents=True, exist_ok=True)
    tasks: list[asyncio.Task[None]] = []
    if s.action_watch_dir is not None:
        tasks.append(asyncio.create_task(run_action_watch_loop(s)))
    if s.measure_watch_dir is not None:
        tasks.append(asyncio.create_task(run_measure_watch_loop(s)))
    yield
    for t in tasks:
        t.cancel()
    for t in tasks:
        try:
            await t
        except asyncio.CancelledError:
            pass


app = FastAPI(title="Fish API", lifespan=lifespan)
app.include_router(ingest.router)
app.include_router(biomass.router)

_settings = get_settings()
_settings.media_root.mkdir(parents=True, exist_ok=True)
app.mount(
    "/media",
    StaticFiles(directory=str(_settings.media_root)),
    name="media",
)


@app.get("/")
async def root():
    return {
        "service": "fish-api",
        "docs": "/docs",
        "ingest": "/api/v1/ingest/",
        "biomass_camera": "/api/v1/biomass/real/camera/",
        "biomass_health": "/api/v1/biomass/health/result/",
        "note": "若配置了 ACTION_WATCH_DIR / MEASURE_WATCH_DIR，启动后会后台监控对应目录。",
    }