from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.middleware.trustedhost import TrustedHostMiddleware
from slowapi import _rate_limit_exceeded_handler
from slowapi.errors import RateLimitExceeded

from app.core.config import settings
from app.core.database import engine, Base
from app.core.limiter import limiter
from app.routers import auth, users, companies
from app.routers import time_entries, absences, reports, ldap, smtp, caldav
from app.routers import import_kimai
from app.routers import kiosk
from app.routers import busylight
from app.routers import audit
from app.routers import special_assignments


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup: Tabellen anlegen falls noch nicht vorhanden (Alembic übernimmt das in Prod)
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    yield
    # Shutdown
    await engine.dispose()


app = FastAPI(
    title=settings.app_name,
    version="0.1.0",
    docs_url="/docs" if not settings.is_production else None,
    redoc_url="/redoc" if not settings.is_production else None,
    lifespan=lifespan,
)

app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)

# ── Middleware ────────────────────────────────────────────────────────────────

app.add_middleware(
    CORSMiddleware,
    allow_origins=[settings.frontend_url],
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"],
    allow_headers=[
        "Content-Type",
        "Authorization",
        "X-Kiosk-Key-Id",
        "X-Kiosk-Timestamp",
        "X-Kiosk-Nonce",
        "X-Kiosk-Signature",
    ],
)

# TrustedHostMiddleware: aktiv sobald ALLOWED_HOSTS gesetzt (Development: leer = deaktiviert)
# Production: ALLOWED_HOSTS=timemaster.example.com in .env setzen
if settings.allowed_hosts:
    app.add_middleware(TrustedHostMiddleware, allowed_hosts=settings.allowed_hosts)

# ── Routers ───────────────────────────────────────────────────────────────────

API_PREFIX = "/api/v1"

app.include_router(auth.router,          prefix=API_PREFIX)
app.include_router(users.router,         prefix=API_PREFIX)
app.include_router(companies.router,     prefix=API_PREFIX)
app.include_router(time_entries.router,  prefix=API_PREFIX)
app.include_router(absences.router,      prefix=API_PREFIX)
app.include_router(reports.router,       prefix=API_PREFIX)
app.include_router(ldap.router,          prefix=API_PREFIX)
app.include_router(smtp.router,          prefix=API_PREFIX)
app.include_router(caldav.router,        prefix=API_PREFIX)
app.include_router(import_kimai.router,  prefix=API_PREFIX)
app.include_router(kiosk.router,         prefix=API_PREFIX)
app.include_router(busylight.router,     prefix=API_PREFIX)
app.include_router(audit.router,         prefix=API_PREFIX)
app.include_router(special_assignments.router, prefix=API_PREFIX)


# ── Health ────────────────────────────────────────────────────────────────────

@app.get("/health", tags=["System"])
async def health():
    return {"status": "ok", "app": settings.app_name, "env": settings.app_env}