import time
from pathlib import Path

from fastapi import FastAPI, Request
from fastapi.staticfiles import StaticFiles

from app.metrics import metrics
from app.api.health import router as health_router
from app.api.chat import router as chat_router
from app.api.transcribe import router as transcribe_router
from app.api.speak import router as speak_router
from app.api.devices import router as devices_router
from app.api.sessions import router as sessions_router
from app.api.config import router as config_router
from app.api.admin import router as admin_router
from app.api.me import router as me_router
from app.api.metrics import router as metrics_router
from app.api.ws import router as ws_router

app = FastAPI(title="Voice Assistant Gateway")


@app.middleware("http")
async def record_metrics(request: Request, call_next):
    start = time.perf_counter()
    response = await call_next(request)
    duration = time.perf_counter() - start
    # Route-Template (z. B. /api/sessions/{session_id}/route) statt konkreter URL,
    # um die Label-Kardinalitaet niedrig zu halten.
    route = request.scope.get("route")
    path = getattr(route, "path", request.url.path)
    labels = {"method": request.method, "path": path}
    metrics.inc("http_requests_total", {**labels, "status": response.status_code})
    metrics.observe("http_request_duration_seconds", duration, labels)
    return response


app.include_router(health_router)
app.include_router(chat_router, prefix="/api")
app.include_router(transcribe_router, prefix="/api")
app.include_router(speak_router, prefix="/api")
app.include_router(devices_router, prefix="/api")
app.include_router(sessions_router, prefix="/api")
app.include_router(config_router, prefix="/api")
app.include_router(admin_router, prefix="/api")
app.include_router(me_router, prefix="/api")
app.include_router(metrics_router, prefix="/api")
app.include_router(ws_router)

# Statische Web-UI (same-origin -> kein CORS). Muss NACH allen API-/WS-Routen
# gemountet werden, damit "/" nur die uebrigen Pfade abfaengt.
class _NoCacheStaticFiles(StaticFiles):
    """Liefert die UI ohne Caching aus -> Aenderungen sind sofort sichtbar (kein Safari-Cache)."""

    def file_response(self, *args, **kwargs):
        response = super().file_response(*args, **kwargs)
        response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
        return response


_WEB_DIR = Path(__file__).resolve().parent / "web"
if _WEB_DIR.is_dir():
    app.mount("/", _NoCacheStaticFiles(directory=str(_WEB_DIR), html=True), name="web")