"""FastAPI application entry point.

Configures CORS, registers routers under /api/v1, exposes health endpoint.
"""

from contextlib import asynccontextmanager

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

from app.config import settings
from app.routers import auth, users


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application startup and shutdown lifecycle."""
    # Startup: could run alembic migrations here in production
    yield
    # Shutdown: cleanup resources


app = FastAPI(
    title=settings.APP_NAME,
    description="ERP Nutzfahrzeuge Backend API",
    version="1.0.0",
    lifespan=lifespan,
)

# CORS configuration from settings
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.cors_origins_list,
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"],
    allow_headers=["*"],
)

# API v1 router
api_v1_router = APIRouter(prefix="/api/v1")
api_v1_router.include_router(auth.router)
api_v1_router.include_router(users.router)

# Health endpoint (no auth required)
@api_v1_router.get("/health", tags=["health"])
async def health_check():
    """Health check endpoint."""
    return {"status": "ok"}


app.include_router(api_v1_router)


@app.get("/")
async def root():
    """Root redirect info."""
    return {"name": settings.APP_NAME, "version": "1.0.0", "docs": "/docs"}