"""
Mission Control 2.0 — dünner FastAPI-Einstieg.

Hängt die Router ein, liefert (in Prod) das gebaute React-Frontend aus und
setzt eine no-cache-Middleware. Im Dev läuft das Frontend über den Vite-Dev-
Server (proxyt /api hierher), daher CORS für localhost offen.
"""

import asyncio
import logging
import os
from contextlib import asynccontextmanager
from typing import Any, AsyncGenerator, Awaitable, Callable

import httpx
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles
from starlette.requests import Request

from config import FRONTEND_DIST, VERSION
from routers import (
    agent,
    auftragsbuch,
    chronik,
    connect,
    console,
    gateway_proxy,
    health,
    hermes_ui,
    ideen,
    maintenance,
    memory,
    models,
    routing,
    system,
    voice,
    wissen,
    zeitmaschine,
)
from routers import reminders as reminders_router
from services import memory as memory_svc
from services import reminders, sentry, warmer

# Zentrales Logging — Level via MC_LOG_LEVEL (INFO default). Eine Konfiguration
# für alle Module (logging.getLogger(__name__)).
logging.basicConfig(
    level=os.environ.get("MC_LOG_LEVEL", "INFO").upper(),
    format="%(asctime)s %(levelname)-7s %(name)s: %(message)s",
)
log = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
    """Hintergrund-Tasks an den App-Lebenszyklus binden: Re-Warm-Wächter fürs Agent-Hirn
    + Health-Wächter (meldet Ausfälle/Erholung in den Lucy-Briefkasten und auf Telegram)."""
    tasks: list[asyncio.Task[Any]] = []
    if warmer.ENABLED:
        tasks.append(asyncio.create_task(warmer.rewarm_loop()))
        log.info(
            "Hirn-Re-Warm-Wächter aktiv (Intervall %ss, Hirn dynamisch aus Hermes-Config)",
            warmer.INTERVAL,
        )
    if sentry.ENABLED:
        tasks.append(asyncio.create_task(sentry.sentry_loop()))
    tasks.append(asyncio.create_task(reminders.reminders_loop()))
    if memory_svc.AUTO_DEDUPE_ENABLED:
        tasks.append(asyncio.create_task(memory_svc.auto_dedupe_loop()))
        log.info(
            "Mem0-Auto-Dedupe aktiv (alle %ss, Schwelle %s)",
            memory_svc.AUTO_DEDUPE_INTERVAL,
            memory_svc.AUTO_DEDUPE_THRESHOLD,
        )
    # Geteilter HTTP-Client zur lokalen Engine: Keep-Alive/Connection-Pooling statt neuer Client
    # pro /v1-Anfrage (spart Sockets/TIME_WAIT unter parallelen Agent-Strömen von Zed/Kilo).
    app.state.gw_client = httpx.AsyncClient(
        timeout=httpx.Timeout(connect=10.0, read=None, write=None, pool=10.0),
        limits=httpx.Limits(max_keepalive_connections=100, max_connections=200),
    )
    try:
        yield
    finally:
        for task in tasks:
            _ = task.cancel()
        await app.state.gw_client.aclose()


app = FastAPI(title="Mission Control 2.0", version=VERSION, lifespan=lifespan)

# Dev: Vite-Dev-Server (5173) ruft das Backend per /api auf.
app.add_middleware(
    CORSMiddleware,
    allow_origins=["http://localhost:5173", "http://127.0.0.1:5173"],
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.middleware("http")
async def no_cache(
    request: Request, call_next: Callable[[Request], Awaitable[httpx.Response]]
) -> httpx.Response:
    resp = await call_next(request)
    if request.url.path.startswith("/api"):
        resp.headers["Cache-Control"] = "no-cache"
    return resp


app.include_router(health.router)
app.include_router(models.router)
app.include_router(routing.router)
app.include_router(system.router)
app.include_router(connect.router)
app.include_router(memory.router)
app.include_router(agent.router)
app.include_router(
    voice.router
)  # Sprache: STT/TTS-Proxy + Hermes-Agent-Chat (Voice-Tab)
app.include_router(
    reminders_router.router
)  # Erinnerungen/Routinen (A3) — feuern in den Briefkasten
app.include_router(gateway_proxy.router)  # OpenAI-kompatibler /v1-Gateway (model:auto)
app.include_router(maintenance.router)
app.include_router(auftragsbuch.router)   # Vorschlags-Inbox (Mensch-Gate als Klick)
app.include_router(ideen.router)          # Ideen-Queue (natives Hermes-Kanban) — Tür der Zentrale
app.include_router(chronik.router)        # Timeline der autonomen Taten (Announce-Store)
app.include_router(wissen.router)         # Wissens-Vault (Traum-Notizen) read-only
app.include_router(zeitmaschine.router)   # Snapshots ansehen + Ein-Klick-Restore (detached)
app.include_router(
    console.router
)  # Box-Konsole (ttyd) same-origin durchreichen — VOR dem SPA-Catch-all
app.include_router(
    hermes_ui.router
)  # Eingebaute Hermes-Web-GUI (hermes serve) same-origin unter /hermes-ui/ — VOR dem SPA-Catch-all


# Prod: gebautes Frontend ausliefern (falls vorhanden). SPA-Fallback auf index.html.
if FRONTEND_DIST.exists():
    app.mount("/assets", StaticFiles(directory=FRONTEND_DIST / "assets"), name="assets")

    _DIST_ROOT = FRONTEND_DIST.resolve()

    @app.get("/{full_path:path}")
    def spa(full_path: str):
        # Datei direkt aus FRONTEND_DIST ausliefern (manifest.webmanifest, favicon.ico, …) — aber
        # NUR innerhalb des dist-Ordners: Pfad auflösen + Traversal (../, absolute Pfade) hart raus.
        try:
            target = (FRONTEND_DIST / full_path).resolve()
            if target.is_relative_to(_DIST_ROOT) and target.is_file():
                return FileResponse(target)
        except (ValueError, OSError):
            pass

        index = FRONTEND_DIST / "index.html"
        if index.exists():
            # index.html nie cachen → Browser zieht nach jedem Deploy das aktuelle (gehashte) Bundle.
            return FileResponse(
                index, headers={"Cache-Control": "no-cache, must-revalidate"}
            )
        return {"detail": "frontend not built"}
