#!/usr/bin/env bash
# =============================================================================
# L0 STATIC CHECK — no service declared `internal` can produce a PUBLIC DNS record.
# See chainsaw-test.yaml's header for the full WHY. In one paragraph:
#
# docs/09 R-DNS-03 and schemas/renderer-contract.md §exposure both say an `internal` service
# renders no public DNS record. Nothing enforced it: ExternalDNS watched every HTTPRoute on the
# shared Gateway, so six internal services published `<name>.home.keithjackson.dev` into the
# public Cloudflare zone answering with the RFC1918 Gateway VIP (verified at the authority
# 2026-09-14; pre-state committed at .standup-dns/dns-20260914-pre-externaldns-scope.txt). The fix
# derives ExternalDNS's controller annotation from `exposure` in catalog/render.py; this check is
# what keeps it derived, present, and scoped.
#
# ASSERTIONS
#   (0) the inventory is non-empty and the parse contract holds (anti-vacuous-pass);
#   (1) every rendered route of an `internal` service carries the disown annotation;
#   (2) NO rendered route of a `public` service carries it — a renderer stamping everything would
#       satisfy (1) and silently delete the five public records under policy: sync;
#   (3) the `service` source half: an internal service's Service may not carry an external-dns
#       hostname annotation without the disown annotation beside it;
#   (4) catalog/render.py DERIVES the annotation from `exposure` — the emitting function reads that
#       field, names no catalog service, and cannot emit external-dns's own `dns-controller`;
#   (5) the SHIPPED renderer is proven end-to-end on synthetic ServiceDefinitions (internal,
#       public, and `exposure` OMITTED — the contract's default posture is internal);
#   (6) every HTTPRoute / annotated Service the catalog does NOT render is declared in
#       KNOWN_NON_CATALOG_PUBLISHERS — shrink-only, stale entries FAIL;
#   (7) the check is LOAD-BEARING: whole-repo scope declared in chainsaw-test.yaml, honoured by
#       ci/l0.sh's --include-scope union, and ci/gate.sh blocks on an l0 failure. NO hand-written
#       ci/l0.sh stage (whole-repo-invariants-wired fails the gate if one appears).
#
# WHAT THIS DOES *NOT* PROVE (honest gaps — it is STATIC, offline, cluster-free):
#   - That the record is gone from Cloudflare. Live read; belongs beside
#     conformance/tests/l2-behavioral/dns-exposure, which owns the positive direction. The negative
#     direction was proven manually on prod against the deployed v0.21.0 (a route carrying the
#     annotation produced no record; adding it to a route that had one produced action=DELETE for
#     both the A and its `a-` TXT within ~60s) — but a manual proof is not a gate.
#   - That an internal name is UNREACHABLE. A port-forward plus a literal IP needs no DNS record.
#     This check owns the NAME axis only.
#   - Anything about the five public services' TARGET. They still answer with the Gateway VIP; the
#     routable-target decision is open and recorded in platform/externaldns/helmrelease.yaml.
#   - It does not read ../home-network-k3s. The spec is read-only (R-TEST-06).
#
# Exit 0 = all assertions pass. Exit 1 = a failure. Exit 3 (honest SKIP, which the runner turns
# into rc 3 = UNWIRED, never green, because this test declares the whole-repo scope) only if
# catalog/ or apps/ is absent — i.e. the subject tree has vanished, which is not a pass.
# =============================================================================
set -euo pipefail
DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ROOT="$(cd "${DIR}/../../../.." && pwd)"        # repo root
PYTHON="${PYTHON:-python3}"

# Honest SKIP (never green for a scope-declaring test) if the subject trees are not there at all.
if [ ! -d "${ROOT}/catalog" ] || [ ! -d "${ROOT}/apps" ] || [ ! -f "${ROOT}/catalog/render.py" ]; then
  echo "check SKIPPED: catalog/, apps/ or catalog/render.py absent — nothing to audit" >&2
  exit 3
fi

cd "${ROOT}"
"${PYTHON}" - "${ROOT}" <<'PY'
"""Static audit: an `internal` ServiceDefinition cannot produce a public DNS record.

PyYAML (the same dependency as catalog/render.py and the sibling l0-static checks) rather than
line-based parsing: an HTTPRoute's annotations and a ServiceDefinition's exposure are nested
structures, and a line-based reader of them is precisely the approximate parser that silently
stops matching — the failure class this check exists to prevent.
"""
from __future__ import annotations

import re
import subprocess
import sys
import tempfile
from pathlib import Path

try:
    import yaml
except ImportError:                                  # pragma: no cover
    print("check FAIL: PyYAML is required (same dependency as catalog/render.py)",
          file=sys.stderr)
    raise SystemExit(1)

ROOT = Path(sys.argv[1])
sys.dont_write_bytecode = True          # keep __pycache__ out of the tracked tree

FAILURES: list[str] = []
CHECKS = 0

# external-dns's own constants (v0.21.0 source/annotations/annotations.go):
#   ControllerKey   = annotationPrefix + "controller"   -> the key below
#   ControllerValue = "dns-controller"                  -> the value that CLAIMS an object
# source/annotations/processors.go IsControllerMismatch skips a source object when the key is
# PRESENT and the value is NOT ControllerValue. So "disowned" == key present, value != claimed.
CONTROLLER_KEY = "external-dns.alpha.kubernetes.io/controller"
CONTROLLER_CLAIMED = "dns-controller"
HOSTNAME_KEY = "external-dns.alpha.kubernetes.io/hostname"


def check(cond, msg):
    global CHECKS
    CHECKS += 1
    if not cond:
        FAILURES.append(msg)


def read(p: Path) -> str:
    try:
        return p.read_text()
    except (OSError, UnicodeDecodeError):
        return ""


def docs_of(p: Path):
    """Every YAML document in a file, tolerating the non-manifest files in the tree."""
    try:
        return [d for d in yaml.safe_load_all(read(p)) if isinstance(d, dict)]
    except yaml.YAMLError:
        return []


# =============================================================================================
# REGISTER — KNOWN_NON_CATALOG_PUBLISHERS. Shrink-only.
#
# These are HAND-AUTHORED HTTPRoutes and Services that put a name into the same public Cloudflare
# zone but that catalog/render.py does not render, so there is no `exposure` field for the renderer
# to derive anything from and this check cannot adjudicate them. That is a real limit, not a pass —
# so each one is DECLARED, with the name it publishes and why it is out of this check's scope, and
# the register can only shrink. An entry naming an object that no longer exists FAILS as stale, so
# a deleted publisher cannot leave a lie behind; a NEW publisher fails until it is declared, so the
# unadjudicated set cannot grow without a review event. Same ratchet reasoning as
# KNOWN_EXTERNAL_MONITORS in servicemonitor-ports-resolve.
#
# EVERY ENTRY HERE IS A NAME THAT STILL ANSWERS WITH AN RFC1918 ADDRESS IN A PUBLIC ZONE. That is
# the honest state after this change, and it is deliberate: converting them is an operator
# decision per name (is grafana meant to be publicly resolvable at all?), not a renderer change,
# and a cluster-wide ExternalDNS opt-in filter — the available hardening, see
# platform/externaldns/helmrelease.yaml — would DELETE all of them at once the moment it is set.
#
# Keyed by "<relpath>:<namespace>/<name>".
# =============================================================================================
KNOWN_NON_CATALOG_PUBLISHERS: dict[str, str] = {
    "platform/oauth2-proxy/httproute.yaml:oauth2-proxy/oauth2-proxy":
        "publishes auth.${BASE_DOMAIN} -> the Gateway VIP. The oauth2-proxy login endpoint is a "
        "platform component, not a catalog service; it must be reachable by every browser that "
        "any forward-auth app redirects, so whether it is PUBLICLY resolvable is coupled to "
        "whether the five public services are — an operator decision, not a renderer one.",
    "platform/keycloak/httproute.yaml:keycloak/keycloak":
        "publishes keycloak.${BASE_DOMAIN} -> the Gateway VIP, and it is the route that actually "
        "OWNS that record (the TXT registry entry reads resource=httproute/keycloak/keycloak, not "
        "the catalog-rendered keycloak-8080 route, because external-dns merges duplicate "
        "hostnames and this one won). Keycloak is `exposure: public` in the catalog, so the name "
        "is meant to be public either way; it is listed because the PUBLISHING object is the "
        "hand-authored platform route, which carries no exposure field.",
    "platform/monitoring/grafana-httproute.yaml:monitoring/grafana":
        "publishes grafana.${BASE_DOMAIN} -> the Gateway VIP. An admin dashboard; almost "
        "certainly should not be publicly resolvable, but it is not a catalog service and "
        "withdrawing it is an operator call with the same LAN-resolution prerequisite as the six "
        "internal services (Pi-hole must answer first).",
    "platform/headlamp/httproute.yaml:headlamp/headlamp":
        "publishes headlamp.${BASE_DOMAIN} -> the Gateway VIP. A Kubernetes web UI with native "
        "Keycloak OIDC; same adjudication as grafana.",
    "platform/homepage/httproute.yaml:homepage/homepage":
        "publishes the APEX ${BASE_DOMAIN} itself -> the Gateway VIP, via the https-apex "
        "listener. The apex is not a per-service name and cannot be withdrawn by an exposure "
        "declaration.",
    "runbooks/serving/httproute.yaml:runbooks/runbooks":
        "declares NO hostnames and inherits the https-apex listener's ${BASE_DOMAIN}, so it "
        "contributes to the apex record rather than a name of its own (the apex TXT registry "
        "entry names the homepage route). Deliberately un-authenticated — see the manifest's own "
        "header for why gating runbooks on Keycloak is a loop with no exit.",
    "platform/crafty/httproute.yaml:crafty/crafty":
        "publishes crafty.${BASE_DOMAIN} -> the Gateway VIP (the Minecraft admin UI, gated by an "
        "oauth2-proxy sidecar). Platform component, no exposure field.",
    "platform/crafty/service-l4.yaml:crafty/crafty-l4-tcp":
        "the `service` SOURCE, not a route: publishes crafty-mc.${BASE_DOMAIN} -> "
        "${CRAFTY_L4_VIP} (192.168.2.22) for the raw Minecraft TCP/UDP game ports the HTTPS "
        "Gateway cannot express. A game server is the one case where a public name may be "
        "genuinely wanted; the address it answers with is still RFC1918.",
    "apps/vms/unifi/50-service-l4.yaml:unifi/unifi-l4-tcp":
        "the `service` source: publishes unifi.${BASE_DOMAIN} -> ${UNIFI_L4_VIP} "
        "(192.168.2.21) for the UniFi controller VM's inform/STUN/adoption ports. Hand-authored "
        "under apps/vms (a VM, not a rendered container service); the catalog's only VM entry is "
        "vm-demo, which declares no ingressRoutes and publishes nothing.",
}

# =============================================================================================
# (0) INVENTORY — the catalog, and every HTTPRoute / annotated Service in the tree.
# =============================================================================================
CATALOG = ROOT / "catalog"
sds: dict[str, dict] = {}
for p in sorted(CATALOG.glob("*.yaml")):
    for d in docs_of(p):
        if "name" in d and "source" in d:
            sds[d["name"]] = d

check(len(sds) > 0, "inventory: catalog/ yielded no ServiceDefinition — parse contract broken")

# The default posture is `internal` (renderer-contract "Default posture"), so an ABSENT field is
# internal, never "unclassified". Getting this wrong in the check would be the same bug as in the
# renderer: a new service that omits exposure would go unaudited.
exposure_of = {n: (sd.get("exposure") or "internal") for n, sd in sds.items()}
# (namespace, routename) -> service, for the routes the renderer emits: one per ingressRoute,
# named "<service>-<port>" in namespace "<service>" (catalog/render.py _route_meta).
expected_routes: dict[tuple[str, str], str] = {}
for n, sd in sds.items():
    for r in sd.get("ingressRoutes") or []:
        expected_routes[(n, f"{n}-{r['port']}")] = n

internal_with_routes = sorted({s for (_, _), s in expected_routes.items()
                               if exposure_of[s] == "internal"})
public_with_routes = sorted({s for (_, _), s in expected_routes.items()
                             if exposure_of[s] == "public"})
check(len(internal_with_routes) > 0,
      "inventory: no `internal` catalog service declares an ingressRoute — the subject set of "
      "this check is empty, which means either the catalog changed shape or the parse is wrong")
check(len(public_with_routes) > 0,
      "inventory: no `public` catalog service declares an ingressRoute — assertion (2) would be "
      "vacuous, so the parse is presumed wrong rather than the repo")

SCAN_DIRS = ["apps", "platform", "runbooks"]
routes: list[tuple[str, dict]] = []          # (relpath, HTTPRoute doc)
dns_services: list[tuple[str, dict]] = []    # (relpath, Service doc carrying an external-dns ann)
for sub in SCAN_DIRS:
    base = ROOT / sub
    if not base.is_dir():
        continue
    for p in sorted(base.rglob("*.yaml")):
        rel = p.relative_to(ROOT).as_posix()
        for d in docs_of(p):
            kind = d.get("kind")
            md = d.get("metadata") or {}
            ann = md.get("annotations") or {}
            if kind == "HTTPRoute":
                routes.append((rel, d))
            elif kind == "Service" and any(
                a.startswith("external-dns.alpha.kubernetes.io/") for a in ann
            ):
                dns_services.append((rel, d))

check(len(routes) > 0, "inventory: no HTTPRoute found under apps/ platform/ runbooks/ — parse "
                       "contract broken (the tree is known to author several)")


def ident(d: dict) -> tuple[str, str]:
    md = d.get("metadata") or {}
    return (md.get("namespace") or "", md.get("name") or "")


def annotations_of(d: dict) -> dict:
    return (d.get("metadata") or {}).get("annotations") or {}


def is_disowned(d: dict) -> bool:
    """True iff external-dns v0.21.0 would SKIP this object: the controller annotation is present
    and its value is not external-dns's own. Absent == published (the default), which is the whole
    point — the annotation is the only thing standing between a route and the public zone."""
    v = annotations_of(d).get(CONTROLLER_KEY)
    return v is not None and v != CONTROLLER_CLAIMED


# =============================================================================================
# (1) + (2) every internal service's rendered route is disowned; no public one is.
# =============================================================================================
by_ident: dict[tuple[str, str], list[tuple[str, dict]]] = {}
for rel, d in routes:
    by_ident.setdefault(ident(d), []).append((rel, d))

for (ns, rname), svc in sorted(expected_routes.items()):
    found = by_ident.get((ns, rname), [])
    check(len(found) >= 1,
          f"({svc}) the catalog declares an ingressRoute rendering HTTPRoute {ns}/{rname}, but no "
          f"such HTTPRoute exists in the applied tree — apps/ is out of sync with catalog/ "
          f"(ci/render-golden.sh owns the byte-level half of this)")
    for rel, d in found:
        if exposure_of[svc] == "internal":
            v = annotations_of(d).get(CONTROLLER_KEY)
            check(
                v is not None,
                f"({svc}) R-DNS-03 VIOLATED: {rel} HTTPRoute {ns}/{rname} belongs to an "
                f"`exposure: internal` service but carries NO `{CONTROLLER_KEY}` annotation, so "
                f"external-dns publishes {ns}.<zone> into the PUBLIC Cloudflare zone answering "
                f"with the RFC1918 Gateway VIP. An internal service must render no public record.",
            )
            check(
                v != CONTROLLER_CLAIMED,
                f"({svc}) {rel} HTTPRoute {ns}/{rname} sets `{CONTROLLER_KEY}: "
                f"{CONTROLLER_CLAIMED}` — that is external-dns's OWN value, which CLAIMS the route "
                f"rather than releasing it. It reads like the guard and is its exact inverse.",
            )
        else:
            check(
                CONTROLLER_KEY not in annotations_of(d),
                f"({svc}) {rel} HTTPRoute {ns}/{rname} belongs to an `exposure: "
                f"{exposure_of[svc]}` service yet carries `{CONTROLLER_KEY}`. Under "
                f"`policy: sync` that DELETES its live public record — the five public services "
                f"must keep publishing.",
            )

# =============================================================================================
# (3) the `service` source half — an internal service's Service may not publish either.
# =============================================================================================
for rel, d in dns_services:
    ns, name = ident(d)
    svc = ns if ns in sds else None
    if svc and exposure_of[svc] == "internal":
        check(
            is_disowned(d),
            f"({svc}) {rel} Service {ns}/{name} carries an external-dns annotation "
            f"({sorted(a for a in annotations_of(d) if a.startswith('external-dns'))}) for an "
            f"`exposure: internal` service without a disowning `{CONTROLLER_KEY}`. Both "
            f"`gateway-httproute` AND `service` are configured sources, so closing only the route "
            f"half is half a guarantee.",
        )

# =============================================================================================
# (4) the GENERATOR derives it from `exposure` — not from a list of service names.
# =============================================================================================
render_py = ROOT / "catalog" / "render.py"
src = read(render_py)
check(bool(src), "catalog/render.py unreadable")

emitter = re.search(
    r"def _externaldns_route_annotations\(.*?\n(?=\n?def |\n?# =====)", src, re.S
)
check(emitter is not None,
      "catalog/render.py must define `_externaldns_route_annotations` — the single place the "
      "ExternalDNS scoping is derived. If it was renamed, rename it here too: this check has to "
      "read the DERIVATION, not just the output, or a hardcoded per-service list would pass.")
if emitter:
    body = emitter.group(0)
    # The derivation must read `exposure`. A body that does not mention it cannot be deriving
    # anything from the operator's declaration.
    check('"exposure"' in body or "'exposure'" in body,
          "`_externaldns_route_annotations` must read the `exposure` field — the guarantee is "
          "that the OPERATOR'S DECLARATION decides, so `exposure` has to appear in the decision")
    # and it must not name any catalog service: a per-service list is how twelve ServiceMonitors
    # acquired one identical wrong port name in a single edit. Only the executable statements are
    # inspected — the docstring legitimately names the affected services as evidence.
    code = re.sub(r'"""(?:.|\n)*?"""', "", body, count=1)
    named = sorted(n for n in sds if re.search(rf"""['"]{re.escape(n)}['"]""", code))
    check(not named,
          f"`_externaldns_route_annotations` names catalog service(s) {named} in its CODE. The "
          f"annotation must be derived from `exposure` alone; a per-service list silently omits "
          f"the next service anyone adds.")
    check(CONTROLLER_CLAIMED not in code,
          f"`_externaldns_route_annotations` must never be able to emit `{CONTROLLER_CLAIMED}` — "
          f"external-dns's own value CLAIMS the object instead of releasing it")

# =============================================================================================
# (5) THE SHIPPED RENDERER IS PROVEN on synthetic ServiceDefinitions. Three fixtures, because
#     "internal is annotated" alone would also pass if the renderer annotated everything, and
#     because the contract's DEFAULT posture is internal — the case a new service hits by
#     omitting the field entirely, and the case a per-service list would miss.
# =============================================================================================
FIXTURES = [
    ("fixture-internal", {"exposure": "internal"}, True,
     "an `internal` fixture must render the disown annotation"),
    ("fixture-public", {"exposure": "public"}, False,
     "a `public` fixture must render NO disown annotation"),
    ("fixture-default", {}, True,
     "a fixture OMITTING `exposure` defaults to internal (renderer-contract default posture) and "
     "must also render the disown annotation"),
]
with tempfile.TemporaryDirectory() as td:
    for fname, extra, want, msg in FIXTURES:
        sd = {
            "name": fname,
            "kind": "container",
            "source": {"image": "example/app:1.0.0"},
            "egress": "internet",
            "dependencies": [],
            "ingressRoutes": [{"host": f"{fname}.home.keithjackson.dev", "port": 8080}],
            # `native` avoids the oauth2-proxy sidecar path and the schema's groups requirement,
            # keeping the fixture about DNS scoping and nothing else. A public service may not use
            # auth.mode none (schema invariant since 1.1.0), so both fixtures use the same mode.
            "auth": {"mode": "native"},
            "update": {"channel": "stable", "cadence": "0 4 * * 0",
                       "autoRollbackOnFailedHealth": True},
            "observability": {"metrics": True, "slis": ["up"]},
            "backup": {"policy": "reacquirable"},
        }
        sd.update(extra)
        f = Path(td) / f"{fname}.yaml"
        f.write_text(yaml.safe_dump(sd, sort_keys=False))
        proc = subprocess.run(
            [sys.executable, str(render_py), str(f), "--no-image-automation"],
            capture_output=True, text=True, cwd=str(ROOT),
        )
        if proc.returncode != 0:
            check(False, f"fixture {fname}: the shipped renderer failed: "
                         f"{proc.stderr.strip()[:400]}")
            continue
        rendered = [d for d in yaml.safe_load_all(proc.stdout)
                    if isinstance(d, dict) and d.get("kind") == "HTTPRoute"]
        check(len(rendered) == 1, f"fixture {fname}: expected exactly one rendered HTTPRoute")
        if rendered:
            got = is_disowned(rendered[0])
            check(got is want, f"fixture {fname}: {msg} (rendered annotations: "
                               f"{annotations_of(rendered[0])})")

# =============================================================================================
# (6) REGISTER RATCHET — every publisher the catalog does not render is declared, and every
#     declaration still names a real object.
# =============================================================================================
catalog_rendered = set(expected_routes)
seen_register_keys: set[str] = set()
for rel, d in routes + dns_services:
    ns, name = ident(d)
    if (ns, name) in catalog_rendered:
        continue
    key = f"{rel}:{ns}/{name}"
    seen_register_keys.add(key)
    check(
        key in KNOWN_NON_CATALOG_PUBLISHERS,
        f"UNDECLARED publisher {key}: a {d.get('kind')} the catalog does not render, so it has no "
        f"`exposure` field this check can adjudicate, and it can put a name into the public "
        f"Cloudflare zone. Add it to KNOWN_NON_CATALOG_PUBLISHERS with what it publishes and why "
        f"it is out of scope — or render it from a ServiceDefinition instead.",
    )
stale = sorted(set(KNOWN_NON_CATALOG_PUBLISHERS) - seen_register_keys)
check(not stale,
      f"STALE register entries {stale}: KNOWN_NON_CATALOG_PUBLISHERS is shrink-only, and these "
      f"name no object in the tree any more. Delete them — a register that keeps entries for "
      f"deleted objects stops being evidence of anything.")

# =============================================================================================
# (7) LOAD-BEARING — the scope is DECLARED here (so ci/l0.sh Stage 3b's --include-scope union
#     always selects this test) and NO stage is hand-written into ci/l0.sh (the
#     whole-repo-invariants-wired meta-test fails the gate if one is).
# =============================================================================================
TEST_DIR = ROOT / "conformance/tests/l0-static/internal-services-publish-no-public-dns"
test_yaml = read(TEST_DIR / "chainsaw-test.yaml")
check(bool(test_yaml), "this test's own chainsaw-test.yaml is unreadable")
check(
    re.search(r'^\s*conformance\.home\.k3s/scope:\s*"?whole-repo"?\s*$', test_yaml, re.M)
    is not None,
    "chainsaw-test.yaml must DECLARE `conformance.home.k3s/scope: \"whole-repo\"` on a real "
    "mapping line — that declaration is the only thing that unions this check into every gate "
    "run (ci/l0.sh Stage 3b). A scope named in prose is documentation, not a declaration.",
)
l0_sh = read(ROOT / "ci/l0.sh")
check(
    "internal-services-publish-no-public-dns" not in l0_sh,
    "ci/l0.sh must NOT name this test: a whole-repo invariant is selected by its DECLARED scope, "
    "and the whole-repo-invariants-wired meta-test fails the gate on a hand-written stage.",
)

# =============================================================================================
if FAILURES:
    for f in FAILURES:
        print(f"check FAIL: {f}", file=sys.stderr)
    print(f"check FAILED: {len(FAILURES)} of {CHECKS} assertions failed", file=sys.stderr)
    raise SystemExit(1)
print(f"check OK: {CHECKS} assertions passed "
      f"({len(sds)} ServiceDefinitions; {len(internal_with_routes)} internal + "
      f"{len(public_with_routes)} public services with routes; {len(routes)} HTTPRoutes and "
      f"{len(dns_services)} external-dns-annotated Services inventoried; "
      f"{len(KNOWN_NON_CATALOG_PUBLISHERS)} declared non-catalog publishers)")
PY