"""Flux delivery gates for the per-tenant HUX service boundary.

The gates are topology-adaptive: before the activation commit lands, the
manifests must contain no partial HUX wiring at all; once the ``hux``
sidecar exists, every boundary assertion below is enforced strictly.
"""

import json
from pathlib import Path

import pytest
import yaml


ROOT = Path(__file__).resolve().parents[2]
SERVICE = ROOT / "services/hermes"
CHAT = SERVICE / "chat-statefulset.yaml"
CHAT_PVCS = SERVICE / "chat-pvcs.yaml"
KUSTOMIZATION = SERVICE / "kustomization.yaml"
WEBUI_IMAGE = "registry.bstein.dev/bstein/hermes-webui"
ALL_FLAGS = {
    "hux.activity_timeline",
    "hux.artifacts",
    "hux.autonomy",
    "hux.foundation",
    "hux.friendly_modes",
    "hux.memory_control",
    "hux.multimodal",
    "hux.onboarding",
    "hux.privacy",
    "hux.projects",
    "hux.release_followthrough",
    "hux.research",
}


def _statefulset() -> dict:
    return yaml.safe_load(CHAT.read_text(encoding="utf-8"))


def _hux_active() -> bool:
    pod = _statefulset()["spec"]["template"]["spec"]
    return any(item["name"] == "hux" for item in pod["containers"])


def _require_activation() -> None:
    if not _hux_active():
        pytest.skip("HUX activation topology is not staged in this tree")


def test_hux_topology_is_all_or_nothing() -> None:
    """A partial HUX rollout (some wiring without the sidecar) never ships."""
    stateful = _statefulset()
    pod = stateful["spec"]["template"]["spec"]
    if _hux_active():
        return
    assert not any(item["name"].startswith("hux") for item in pod["containers"])
    assert not any(
        item["name"] == "init-hux-runtime" for item in pod.get("initContainers", [])
    )
    assert not any(item["name"].startswith("hux-") for item in pod["volumes"])
    claims = {
        item["metadata"]["name"]
        for item in yaml.safe_load_all(CHAT_PVCS.read_text(encoding="utf-8"))
    }
    assert "hermes-chat-hux-data" not in claims
    for container in pod["containers"]:
        assert not any(
            entry["name"].startswith("HUX_") for entry in container.get("env", [])
        )


def _named(items: list[dict], name: str) -> dict:
    return next(item for item in items if item["name"] == name)


def _env(container: dict) -> dict[str, str]:
    return {item["name"]: item.get("value", "") for item in container["env"]}


def _mounts(container: dict) -> dict[str, dict]:
    return {item["name"]: item for item in container.get("volumeMounts", [])}


def test_hux_sidecar_is_loopback_only_and_uses_the_reviewed_webui_image() -> None:
    """The browser BFF and HUX backend ship as one immutable reviewed artifact."""
    _require_activation()
    pod = _statefulset()["spec"]["template"]["spec"]
    webui = _named(pod["containers"], "webui")
    hux = _named(pod["containers"], "hux")
    values = _env(hux)

    assert webui["image"] == hux["image"]
    assert webui["image"].startswith(WEBUI_IMAGE + ":")
    assert values["HUX_BIND"] == "127.0.0.1"
    assert values["HUX_PORT"] == "8790"
    assert values["HUX_DATA_ROOT"] == "/var/lib/hux/store"
    # Progressive enablement: the canary starts foundation-only and cards are
    # switched on one lifecycle gate at a time; unknown flags never ship.
    flags = {flag for flag in values["HUX_FLAGS"].split(",") if flag}
    assert "hux.foundation" in flags
    assert flags <= ALL_FLAGS
    assert set(values["HUX_SWITCHYARD_ROUTE_CATALOG"].split(",")) == {
        "atlas/manual/codex/luna",
        "atlas/manual/codex/terra",
        "atlas/manual/codex/sol",
        "atlas/manual/claude/haiku",
        "atlas/manual/claude/fable",
        "atlas/manual/claude/sonnet",
        "atlas/manual/claude/opus",
        "atlas/manual/local/qwen-14b",
    }
    assert values["PYTHONDONTWRITEBYTECODE"] == "1"
    assert hux["securityContext"]["readOnlyRootFilesystem"] is True
    assert hux["securityContext"]["capabilities"]["drop"] == ["ALL"]
    for probe in ("readinessProbe", "livenessProbe"):
        command = " ".join(hux[probe]["exec"]["command"])
        assert "127.0.0.1" in command
        assert "8790" in command
        assert "/healthz" in command
        assert "tcpSocket" not in hux[probe]
    assert "8790" not in (SERVICE / "service.yaml").read_text(encoding="utf-8")
    policy = (SERVICE / "networkpolicy.yaml").read_text(encoding="utf-8")
    assert "port: 8790" not in policy


def test_hux_storage_and_keys_are_mounted_by_least_privilege() -> None:
    """Hermes receives only its key/context views, never the HUX ledger root."""
    _require_activation()
    stateful = _statefulset()
    pod = stateful["spec"]["template"]["spec"]
    hermes = _named(pod["containers"], "hermes")
    webui = _named(pod["containers"], "webui")
    hux = _named(pod["containers"], "hux")
    media = _named(pod["containers"], "telegram-media")
    hermes_mounts = hermes["volumeMounts"]
    webui_mounts = _mounts(webui)
    hux_mounts = _mounts(hux)

    assert hux_mounts["hux-data"] == {
        "name": "hux-data",
        "mountPath": "/var/lib/hux",
        "subPathExpr": "$(POD_NAME)",
    }
    assert {
        item["subPathExpr"]
        for item in hermes_mounts
        if item["name"] == "hux-data"
    } == {"$(POD_NAME)/binding", "$(POD_NAME)/context"}
    assert webui_mounts["hux-data"]["subPathExpr"] == "$(POD_NAME)/context"
    assert not any(item.get("mountPath") == "/var/lib/hux" for item in hermes["volumeMounts"])
    assert not any(item.get("mountPath") == "/var/lib/hux" for item in webui["volumeMounts"])
    assert not any(item["name"].startswith("hux-") for item in media["volumeMounts"])
    assert not any(item["name"] == "hux-relay-key" for item in hermes_mounts)
    assert "hux-worker-key" not in webui_mounts

    assert {item["metadata"]["name"] for item in stateful["spec"]["volumeClaimTemplates"]} == {
        "home",
        "workspace",
    }
    claims = {
        item["metadata"]["name"]: item
        for item in yaml.safe_load_all(CHAT_PVCS.read_text(encoding="utf-8"))
    }
    claim = claims["hermes-chat-hux-data"]["spec"]
    assert claim["accessModes"] == ["ReadWriteMany"]
    assert claim["storageClassName"] == "astreae"
    assert claim["resources"]["requests"]["storage"] == "10Gi"


def test_hux_init_preserves_context_identity_and_rotates_transport_keys() -> None:
    """Context identity is durable while relay/worker credentials are pod-local."""
    _require_activation()
    pod = _statefulset()["spec"]["template"]["spec"]
    init = _named(pod["initContainers"], "init-hux-runtime")
    script = init["args"][0]
    volumes = {item["name"]: item for item in pod["volumes"]}

    assert 'tenant_root="/hux-data/${HOSTNAME}"' in script
    assert "chown -R" not in script
    assert 'if [ ! -e "${tenant_root}/context/context-key" ]' in script
    assert "bs=32 count=1" in script
    assert 'chmod 0600 "${tenant_root}/context/context-key"' in script
    assert "/hux-relay/relay-key /hux-worker/worker-key" in script
    assert "chmod 0400" in script
    assert 'ordinal="${HOSTNAME##*-}"' in script
    assert 'b"hux.subject.id.v1\\0" + slot.encode("ascii")' in script
    assert 'target = root / "binding/subject"' in script
    assert 'or stat.S_IMODE(info.st_mode) != 0o440' in script
    assert volumes["hux-relay-key"]["emptyDir"]["medium"] == "Memory"
    assert volumes["hux-worker-key"]["emptyDir"]["medium"] == "Memory"
    assert init["securityContext"]["capabilities"] == {
        "drop": ["ALL"],
        "add": ["CHOWN", "DAC_OVERRIDE", "FOWNER"],
    }


def test_hux_identity_and_authentication_inputs_are_file_backed() -> None:
    """No HUX shared key or subject is placed directly in an environment value."""
    _require_activation()
    pod = _statefulset()["spec"]["template"]["spec"]
    hermes = _env(_named(pod["containers"], "hermes"))
    webui = _env(_named(pod["containers"], "webui"))
    hux = _env(_named(pod["containers"], "hux"))

    assert hermes["HUX_WORKER_KEY_FILE"] == "/run/hermes-hux-worker/worker-key"
    assert hermes["HUX_SUBJECT_FILE"] == "/run/hermes-hux-subject/subject"
    assert hermes["HUX_CONTEXT_KEY_FILE"] == "/run/hermes-hux-context/context-key"
    # Enforcement is a staged posture: 0 while observing, 1 once the live
    # park/resume and receipt gates have passed on the canary.
    assert hermes["HUX_TOOL_ENFORCEMENT"] in {"0", "1"}
    assert webui["HUX_CONTEXT_KEY_FILE"] == "/run/hermes-hux-context/context-key"
    assert hux["HUX_RELAY_KEY_FILE"] == "/run/hermes-webui-hux/relay-key"
    assert hux["HUX_WORKER_KEY_FILE"] == "/run/hermes-hux-worker/worker-key"
    assert hux["HUX_SUBJECT_BINDING_FILE"] == "/var/lib/hux/binding/subject"
    assert hux["HUX_CONTEXT_KEY_FILE"] == "/var/lib/hux/context/context-key"
    assert hux["HUX_IMAGE_TAG"].startswith("git-")
    assert hux["HUX_IMAGE_TAG"].endswith("-release")
    assert hux["HUX_IMAGE_DIGEST"].startswith("sha256:")
    assert not {"HUX_RELAY_KEY", "HUX_WORKER_KEY", "HUX_ROUTER_KEY"} & set(hux)


def test_hux_evidence_producer_is_isolated_and_fail_closed() -> None:
    """The HUX-12 evidence key reaches only the service and the producer."""
    _require_activation()
    stateful = _statefulset()
    pod = stateful["spec"]["template"]["spec"]
    producer = _named(pod["containers"], "hux-evidence-producer")
    hux = _named(pod["containers"], "hux")
    hermes = _named(pod["containers"], "hermes")
    webui = _named(pod["containers"], "webui")
    media = _named(pod["containers"], "telegram-media")

    assert producer["image"] == hux["image"]
    values = _env(producer)
    assert values["HUX_RELEASE_EVIDENCE_KEY_FILE"] == "/run/hermes-hux-evidence/evidence-key"
    assert values["HUX_RELEASE_EVIDENCE_POLICY_FILE"] == "/etc/hux-evidence/policy.json"
    assert values["HUX_PRODUCER_WORKLOAD"] == "hermes-webui"
    assert _env(hux)["HUX_RELEASE_EVIDENCE_KEY_FILE"] == "/run/hermes-hux-evidence/evidence-key"
    assert producer["securityContext"]["readOnlyRootFilesystem"] is True
    assert producer["securityContext"]["capabilities"]["drop"] == ["ALL"]
    for denied in (hermes, webui, media):
        assert not any(
            item["name"] == "hux-evidence-key" for item in denied.get("volumeMounts", [])
        )
    staging = _named(pod["initContainers"], "stage-hux-evidence")
    script = staging["args"][0]
    assert "if [ -s /vault/secrets/hux-evidence-key ]" in script
    assert "chmod 0400" in script
    volumes = {item["name"]: item for item in pod["volumes"]}
    assert volumes["hux-evidence-key"]["emptyDir"]["medium"] == "Memory"
    assert volumes["hux-evidence-policy"]["configMap"]["name"] == "hermes-hux-evidence-policy"
    policy = json.loads((SERVICE / "hux-evidence-policy.json").read_text(encoding="utf-8"))
    assert policy["schema"] == "hux.release_evidence_policy.v1"
    assert set(policy["workloads"]) == {"hermes-webui"}
    rbac = (SERVICE / "hux-evidence-rbac.yaml").read_text(encoding="utf-8")
    assert "verbs: [get, list]" in rbac and "secrets" not in rbac
    rendered = KUSTOMIZATION.read_text(encoding="utf-8")
    assert "hux-evidence-rbac.yaml" in rendered
    assert "policy.json=hux-evidence-policy.json" in rendered


def test_hux_runtime_plugin_renders_its_vendored_hook_package() -> None:
    """The mounted plugin must contain its Kustomize-local Python package tree."""
    _require_activation()
    stateful = _statefulset()
    pod = stateful["spec"]["template"]["spec"]
    plugin = _named(pod["volumes"], "hux-runtime-plugin")["configMap"]
    items = {item["key"]: item["path"] for item in plugin["items"]}
    expected = {
        "hux-hook-init.py": "hux_hook/__init__.py",
        "hux-hook-client.py": "hux_hook/client.py",
        "hux-hook-hooks.py": "hux_hook/hooks.py",
    }

    assert expected.items() <= items.items()
    rendered = KUSTOMIZATION.read_text(encoding="utf-8")
    assert "hux-hook-init.py=plugins/hux-runtime/hux_hook/__init__.py" in rendered
    assert "hux-hook-client.py=plugins/hux-runtime/hux_hook/client.py" in rendered
    assert "hux-hook-hooks.py=plugins/hux-runtime/hux_hook/hooks.py" in rendered