import logging
from contextlib import asynccontextmanager
from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from sqlalchemy import select

# uvicorn's dictConfig only configures uvicorn.* loggers; the root logger
# ends up with no handler, so app.* records are silently discarded.
# Give the app namespace its own StreamHandler to guarantee output.
_app_logger = logging.getLogger("app")
_app_logger.setLevel(logging.INFO)
if not _app_logger.handlers:
    _h = logging.StreamHandler()
    _h.setFormatter(logging.Formatter("%(levelname)-8s [%(name)s] %(message)s"))
    _app_logger.addHandler(_h)
_app_logger.propagate = False

log = logging.getLogger(__name__)

from app.config import settings
from app.database import engine, Base, SessionLocal
from app.routers import libraries, media, tags, search, auth
from app.services import watcher as watcher_service
from app.auth import hash_password
import app.models  # noqa: F401 — registers models with Base.metadata


async def _ensure_admin_user():
    from app.models import User

    if not settings.admin_password:
        log.warning("ADMIN_PASSWORD not set — no admin user will be created.")
        return

    async with SessionLocal() as db:
        result = await db.execute(select(User).where(User.username == settings.admin_username))
        if result.scalars().first():
            log.info("Admin user '%s' already exists.", settings.admin_username)
            return

        user = User(
            username=settings.admin_username,
            password_hash=hash_password(settings.admin_password),
            is_admin=True,
        )
        db.add(user)
        await db.commit()
        log.info("Created admin user '%s'.", settings.admin_username)


@asynccontextmanager
async def lifespan(app: FastAPI):
    log.info("Creating database tables...")
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

    await _ensure_admin_user()

    log.info("Starting library watchers...")
    await watcher_service.start_all()

    log.info("Startup complete.")
    yield

    await watcher_service.stop_all()


app = FastAPI(title="MediaLore", lifespan=lifespan)


@app.exception_handler(Exception)
async def unhandled_exception_handler(request: Request, exc: Exception):
    log.exception("Unhandled error on %s %s", request.method, request.url)
    return JSONResponse(status_code=500, content={"detail": str(exc)})


app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(auth.router, prefix="/api")
app.include_router(libraries.router, prefix="/api")
app.include_router(media.router, prefix="/api")
app.include_router(tags.router, prefix="/api")
app.include_router(search.router, prefix="/api")