"""Aplicatia FastAPI: API v1 + dashboard web + /healthz + /metrics.

Worker-ul ruleaza ca PROCES SEPARAT (python -m app.worker), NU ca task aici
(plan.md sect. 4: un worker mort nu trebuie sa lase containerul "sanatos").

Pornire dev:  uvicorn app.main:app --reload
"""

from __future__ import annotations

from contextlib import asynccontextmanager
from datetime import datetime, timezone
from pathlib import Path

from fastapi import FastAPI, Request
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse, PlainTextResponse
from fastapi.staticfiles import StaticFiles

from . import __version__
from .api.v1.router import router as api_v1_router
from .config import get_settings
from .db import get_connection, init_db, queue_depth, read_heartbeat
from .security import install_log_redaction
from .web.routes import router as web_router


@asynccontextmanager
async def lifespan(app: FastAPI):
    install_log_redaction()
    init_db()
    yield


app = FastAPI(title="Gateway RAR AUTOPASS", version=__version__, lifespan=lifespan)


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError) -> JSONResponse:
    """422 fara echo de credentiale.

    Pydantic include implicit `input` (+ uneori `ctx`) in fiecare eroare — pe
    /v1/prezentari asta ar reflecta inapoi `rar_credentials.password`. Pastram
    type/loc/msg (clientul stie ce camp e gresit) si DROP-am input/ctx. Defense
    in depth pe TOATE rutele, nu doar prezentari.
    """
    cleaned = [{"type": e.get("type"), "loc": e.get("loc"), "msg": e.get("msg")} for e in exc.errors()]
    return JSONResponse(status_code=422, content={"detail": cleaned})


# Assets servite local (htmx vendorizat), NU din CDN: gateway-ul ruleaza
# offline (LXC/VPS, Cloudflare Tunnel). Fara asta, dashboard-ul ramane static
# (zero polling banner/coada) cand unpkg e blocat/inaccesibil. Aceeasi decizie
# offline-first ca fontul UI (fara dependinta CDN).
_STATIC_DIR = Path(__file__).resolve().parent / "web" / "static"
app.mount("/static", StaticFiles(directory=str(_STATIC_DIR)), name="static")

app.include_router(api_v1_router)
app.include_router(web_router)


@app.get("/healthz")
def healthz() -> dict:
    """Sanatate: worker viu + ultimul login RAR reusit + adancime coada.

    Pica (200 cu ok=False / sau folosit de orchestrator) cand worker-ul e mort
    -> semnal de restart (plan.md sect. 8). Intoarce 200 mereu cu detalii;
    orchestratorul decide pe campul `worker_alive`.
    """
    settings = get_settings()
    conn = get_connection()
    try:
        hb = read_heartbeat(conn)
        depth = queue_depth(conn)
    finally:
        conn.close()

    worker_alive = False
    last_beat = hb["last_beat"] if hb else None
    if last_beat:
        try:
            age = (datetime.now(timezone.utc) - datetime.fromisoformat(last_beat)).total_seconds()
            worker_alive = age <= settings.worker_heartbeat_stale_s
        except ValueError:
            worker_alive = False

    return {
        "ok": True,
        "version": __version__,
        "rar_env": settings.rar_env,
        "worker_alive": worker_alive,
        "last_beat": last_beat,
        "last_rar_login_ok": hb["last_rar_login_ok"] if hb else None,
        "queue_depth": depth,
    }


@app.get("/metrics", response_class=PlainTextResponse)
def metrics() -> str:
    """Metrici text simplu (submissions pe status + backlog). Format Prometheus-lite."""
    conn = get_connection()
    try:
        rows = conn.execute("SELECT status, COUNT(*) AS n FROM submissions GROUP BY status").fetchall()
    finally:
        conn.close()
    lines = ["# submissions pe status"]
    for r in rows:
        lines.append(f'autopass_submissions{{status="{r["status"]}"}} {r["n"]}')
    return "\n".join(lines) + "\n"