"""FastAPI-Anwendung (Einstiegspunkt).

Start (Dev):   uvicorn app.main:app --reload
Start (Prod):  gunicorn -c deploy/gunicorn_conf.py app.main:app
"""
from __future__ import annotations

import time
import uuid

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

from .api.router import api_router
from .config import settings
from .core.errors import register_exception_handlers
from .core.logging import configure_logging, get_logger

configure_logging()
logger = get_logger("plate_ai.app")

app = FastAPI(
    title="plate-ai-api",
    version="0.1.0",
    description="Kennzeichen- und Fahrzeugerkennung als API (DE/EU-Fokus).",
    docs_url="/docs" if not settings.is_production or settings.debug else None,
    redoc_url=None,
)

if settings.cors_origins_list:
    app.add_middleware(
        CORSMiddleware,
        allow_origins=settings.cors_origins_list,
        allow_methods=["GET", "POST", "DELETE"],
        allow_headers=["*"],
    )


@app.middleware("http")
async def add_request_context(request: Request, call_next):
    request.state.request_id = request.headers.get("X-Request-ID") or str(uuid.uuid4())
    start = time.perf_counter()
    response = await call_next(request)
    response.headers["X-Request-ID"] = request.state.request_id
    response.headers["X-Response-Time-ms"] = str(int((time.perf_counter() - start) * 1000))
    return response


register_exception_handlers(app)
app.include_router(api_router)


@app.on_event("startup")
async def _startup():
    if settings.secret_key.startswith("CHANGE_ME"):
        logger.warning("insecure_default_secret", extra={"event": "config_warning"})
    logger.info("startup", extra={"event": "startup"})


@app.get("/")
def root():
    return {"service": "plate-ai-api", "version": "0.1.0", "docs": "/docs",
            "health": f"{settings.api_prefix}/health"}