"""Liveness and readiness endpoints.

``/health/live`` answers whether the process is up. ``/health/ready`` answers
whether it can serve: the database is reachable and configured correctly (WAL,
foreign keys). Tests and any future orchestration wait on readiness rather than a
sleep. Readiness returns 503 until the checks pass.
"""

from __future__ import annotations

from fastapi import APIRouter, Request, Response
from sqlalchemy import text

router = APIRouter(tags=["health"])


@router.get("/health/live")
def live() -> dict:
    return {"status": "alive"}


@router.get("/health/ready")
def ready(request: Request, response: Response) -> dict:
    checks: dict[str, object] = {}
    ok = True
    engine = getattr(request.app.state, "engine", None)
    if engine is None:
        ok = False
        checks["database"] = "unavailable"
    else:
        try:
            with engine.connect() as conn:
                conn.execute(text("SELECT 1"))
                journal_mode = conn.execute(text("PRAGMA journal_mode")).scalar()
                foreign_keys = conn.execute(text("PRAGMA foreign_keys")).scalar()
            checks["database"] = "ok"
            checks["journal_mode"] = journal_mode
            checks["foreign_keys"] = int(foreign_keys)
            if str(journal_mode).lower() != "wal" or int(foreign_keys) != 1:
                ok = False
        except Exception:
            ok = False
            checks["database"] = "error"
    response.status_code = 200 if ok else 503
    return {"status": "ready" if ok else "not_ready", "checks": checks}