"""Adversarial boundaries for the Hermes image publisher and trigger."""

from __future__ import annotations

import importlib.util
import io
import json
from pathlib import Path

import pytest


REPO_ROOT = Path(__file__).resolve().parents[2]
RELEASE_SCRIPT = REPO_ROOT / "ci/scripts/hermes_image_release.py"
TRIGGER_SCRIPT = REPO_ROOT / "services/hermes/scripts/jenkins_image_build_trigger.py"


def _load(path: Path, name: str):
    spec = importlib.util.spec_from_file_location(name, path)
    assert spec is not None and spec.loader is not None
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


class Response(io.BytesIO):
    """Small context-managed HTTP response fixture."""

    def __init__(
        self,
        status: int,
        headers: dict[str, str] | None = None,
        body: bytes = b"",
    ):
        super().__init__(body)
        self.status = status
        self.headers = headers or {}


def test_kaniko_evidence_binds_digest_destination_and_unique_build() -> None:
    """Both Kaniko artifacts must describe one exact non-replayable tag."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_evidence")
    revision = "a" * 40
    digest = "sha256:" + "b" * 64
    destination = f"{module.DEFAULT_IMAGE}:git-{revision}-build-42"
    assert module.validate_destination(destination, revision, "42") == (
        revision,
        "42",
    )
    assert (
        module.validate_kaniko_evidence(
            digest_text=f"{digest}\n",
            image_text=f"{destination}@{digest}\n",
            destination=destination,
        )
        == digest
    )


@pytest.mark.parametrize(
    ("digest_text", "image_template"),
    [
        ("sha256:" + "a" * 64 + "\nextra\n", "{destination}@{digest}"),
        ("sha256:" + "a" * 64, "{destination}@sha256:" + "b" * 64),
        ("sha256:" + "a" * 64, "registry.invalid/x:y@{digest}"),
        ("sha256:" + "a" * 64, "{destination}@{digest}\nextra"),
    ],
)
def test_kaniko_evidence_rejects_cross_artifact_mismatch(
    digest_text: str, image_template: str
) -> None:
    """A digest, tag, repository, or cardinality mismatch stops rendering."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_mismatch")
    revision = "c" * 40
    digest = "sha256:" + "a" * 64
    destination = f"{module.DEFAULT_IMAGE}:git-{revision}-build-8"
    image_text = image_template.format(destination=destination, digest=digest)
    with pytest.raises(ValueError):
        module.validate_kaniko_evidence(
            digest_text=digest_text,
            image_text=image_text,
            destination=destination,
        )


def test_registry_preflight_rejects_existing_tag_and_auth_failures() -> None:
    """Only an authenticated 404 permits Kaniko to claim the unique tag."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_preflight")
    destination = f"{module.DEFAULT_IMAGE}:git-{'d' * 40}-build-3"
    captured = {}

    def missing(request, timeout):
        captured["request"] = request
        captured["timeout"] = timeout
        return Response(404)

    module.assert_tag_absent(
        destination, username="robot", password="private", opener=missing
    )
    request = captured["request"]
    assert request.method == "GET"
    assert request.full_url.startswith(
        "https://registry.bstein.dev/api/v2.0/projects/bstein/repositories/"
        "hermes-agent/artifacts/"
    )
    assert "private" not in request.full_url
    assert captured["timeout"] == 20

    for status, message in (
        (200, "already exists"),
        (401, "HTTP 401"),
        (503, "HTTP 503"),
    ):
        with pytest.raises(RuntimeError, match=message):
            module.assert_tag_absent(
                destination,
                username="robot",
                password="private",
                opener=lambda *_args, code=status: Response(code),
            )


def test_registry_preflight_requires_exact_server_immutable_policy() -> None:
    """The already-running controller cannot publish before Flux installs the rule."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_policy_preflight")
    expected = {
        "disabled": False,
        "action": "immutable",
        "template": "immutable_template",
        "tag_selectors": [
            {
                "kind": "doublestar",
                "decoration": "matches",
                "pattern": "git-*-build-*",
            }
        ],
        "scope_selectors": {
            "repository": [
                {
                    "kind": "doublestar",
                    "decoration": "repoMatches",
                    "pattern": "hermes-agent",
                }
            ]
        },
    }
    captured = {}

    def exact(request, timeout):
        captured["url"] = request.full_url
        captured["timeout"] = timeout
        return Response(
            200,
            {"X-Total-Count": "1"},
            body=json.dumps([{"id": 9, **expected}]).encode(),
        )

    module.verify_immutable_policy(username="robot", password="private", opener=exact)
    assert captured["url"].endswith(
        "/projects/bstein/immutabletagrules?page=1&page_size=100"
    )
    assert captured["timeout"] == 20

    for status, body, headers, message in (
        (403, b"", {}, "HTTP 403"),
        (200, b"[]", {"X-Total-Count": "0"}, "absent"),
        (
            200,
            json.dumps([{**expected, "disabled": True}]).encode(),
            {"X-Total-Count": "1"},
            "not exact",
        ),
        (200, b"not-json", {}, "invalid"),
        (
            200,
            json.dumps([expected]).encode(),
            {"X-Total-Count": "2"},
            "truncated",
        ),
    ):
        with pytest.raises(RuntimeError, match=message):
            module.verify_immutable_policy(
                username="robot",
                password="private",
                opener=lambda *_args, code=status, value=body, evidence=headers: Response(
                    code, evidence, body=value
                ),
            )


def test_harbor_client_fails_closed_on_input_size_auth_and_json(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Malformed inputs, oversized bodies, missing auth, and bad JSON all fail."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_harbor_errors")
    destination = f"{module.DEFAULT_IMAGE}:git-{'1' * 40}-build-6"
    with pytest.raises(ValueError, match="destination"):
        module.assert_tag_absent(
            "registry.invalid/x:tag", username="robot", password="private"
        )
    with pytest.raises(RuntimeError, match="credentials"):
        module.assert_tag_absent(destination, username="", password="private")
    with pytest.raises(RuntimeError, match="size limit"):
        module.assert_tag_absent(
            destination,
            username="robot",
            password="private",
            opener=lambda *_args: Response(200, body=b"x" * 1_048_577),
        )
    with pytest.raises(RuntimeError, match="invalid artifact JSON"):
        module.verify_registry_digest(
            destination,
            "sha256:" + "2" * 64,
            username="robot",
            password="private",
            opener=lambda *_args: Response(200, body=b"\xff"),
        )
    monkeypatch.delenv("HARBOR_USER", raising=False)
    monkeypatch.delenv("HARBOR_PASSWORD", raising=False)
    with pytest.raises(RuntimeError, match="unavailable"):
        module._credentials()


def test_default_harbor_opener_returns_http_responses(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """The real wrapper returns both normal and non-redirect HTTP responses."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_opener")
    request = module.urllib.request.Request("https://registry.bstein.dev/test")

    class SuccessOpener:
        def open(self, _request, timeout):
            assert timeout == 7
            return Response(204)

    monkeypatch.setattr(
        module.urllib.request, "build_opener", lambda *_handlers: SuccessOpener()
    )
    assert module._registry_request(request, 7).status == 204

    class ErrorOpener:
        def open(self, _request, timeout):
            assert timeout == 8
            raise module.urllib.error.HTTPError(
                _request.full_url, 404, "missing", {}, None
            )

    monkeypatch.setattr(
        module.urllib.request, "build_opener", lambda *_handlers: ErrorOpener()
    )
    assert module._registry_request(request, 8).code == 404


@pytest.mark.parametrize(
    ("status", "artifact", "message"),
    [
        (404, {}, "HTTP 404"),
        (200, {}, "omitted"),
        (200, {"digest": "sha256:" + "2" * 64}, "does not match"),
        (200, {"digest": "latest"}, "omitted"),
    ],
)
def test_registry_verification_rejects_missing_or_mismatched_digest(
    status: int, artifact: dict[str, str], message: str
) -> None:
    """Rendering requires an independent exact Harbor digest response."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_registry")
    digest = "sha256:" + "1" * 64
    destination = f"{module.DEFAULT_IMAGE}:git-{'e' * 40}-build-4"
    body = json.dumps(artifact).encode("utf-8")
    with pytest.raises(RuntimeError, match=message):
        module.verify_registry_digest(
            destination,
            digest,
            username="robot",
            password="private",
            opener=lambda *_args: Response(status, body=body),
        )


def test_registry_verification_accepts_exact_pushed_digest() -> None:
    """An exact authenticated Harbor digest allows artifact rendering."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_registry_ok")
    digest = "sha256:" + "4" * 64
    destination = f"{module.DEFAULT_IMAGE}:git-{'f' * 40}-build-5"
    with pytest.raises(RuntimeError, match="expected tag"):
        module.verify_registry_digest(
            destination,
            digest,
            username="robot",
            password="private",
            opener=lambda *_args: Response(
                200,
                body=json.dumps(
                    {"digest": digest, "tags": [{"name": "different-tag"}]}
                ).encode("utf-8"),
            ),
        )
    module.verify_registry_digest(
        destination,
        digest,
        username="robot",
        password="private",
        opener=lambda *_args: Response(
            200,
            body=json.dumps(
                {
                    "digest": digest,
                    "tags": [
                        {
                            "name": destination.rsplit(":", 1)[1],
                            "immutable": True,
                        }
                    ],
                }
            ).encode("utf-8"),
        ),
    )


def test_registry_verification_rejects_tag_without_server_immutability() -> None:
    """Digest evidence is insufficient unless Harbor reports the build tag immutable."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_registry_mutable")
    digest = "sha256:" + "7" * 64
    destination = f"{module.DEFAULT_IMAGE}:git-{'8' * 40}-build-19"
    captured = {}

    def opener(request, _timeout):
        captured["url"] = request.full_url
        return Response(
            200,
            body=json.dumps(
                {
                    "digest": digest,
                    "tags": [
                        {
                            "name": destination.rsplit(":", 1)[1],
                            "immutable": False,
                        }
                    ],
                }
            ).encode(),
        )

    with pytest.raises(RuntimeError, match="immutable"):
        module.verify_registry_digest(
            destination,
            digest,
            username="robot",
            password="private",
            opener=opener,
        )
    assert captured["url"].endswith("?with_immutable_status=true")


def test_release_main_preflight_uses_fixed_credentials_and_destination(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """The preflight CLI validates and checks exactly the requested build tag."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_main_absent")
    revision = "3" * 40
    destination = f"{module.DEFAULT_IMAGE}:git-{revision}-build-12"
    captured = {}
    monkeypatch.setenv("HARBOR_USER", "robot")
    monkeypatch.setenv("HARBOR_PASSWORD", "private")

    def assert_absent(value, **credentials):
        captured["destination"] = value
        captured["credentials"] = credentials

    def verify_policy(**credentials):
        captured["policy_credentials"] = credentials

    monkeypatch.setattr(module, "assert_tag_absent", assert_absent)
    monkeypatch.setattr(module, "verify_immutable_policy", verify_policy)
    monkeypatch.setattr(
        "sys.argv",
        [
            "hermes_image_release.py",
            "assert-absent",
            "--source-revision",
            revision,
            "--build-number",
            "12",
            "--destination",
            destination,
        ],
    )
    assert module.main() == 0
    assert captured == {
        "destination": destination,
        "credentials": {"username": "robot", "password": "private"},
        "policy_credentials": {"username": "robot", "password": "private"},
    }


def test_renderer_skips_a_matching_entry_without_a_digest() -> None:
    """Only the one complete image entry is changed when an earlier entry drifts."""
    module = _load(RELEASE_SCRIPT, "hermes_image_release_manifest_scan")
    digest = "sha256:" + "5" * 64
    source = (
        "images:\n"
        f"  - name: {module.DEFAULT_IMAGE}\n"
        "    newTag: ignored\n"
        "  - name: example.invalid/other\n"
        "    newTag: stable\n"
        f"  - name: {module.DEFAULT_IMAGE}\n"
        "    digest: sha256:" + "0" * 64 + "\n"
    )
    assert module.render_kustomization(source, digest).endswith(f"{digest}\n")


@pytest.mark.parametrize("status", [200, 202, 204, 301, 302, 307, 308])
def test_trigger_rejects_non_plugin_success_status(tmp_path: Path, status: int) -> None:
    """Generic proxy successes and redirects are not proof of a queued build."""
    module = _load(TRIGGER_SCRIPT, f"jenkins_trigger_status_{status}")
    token = tmp_path / "token"
    token.write_text("private\n", encoding="utf-8")
    response = lambda *_args, **_kwargs: Response(  # noqa: E731
        status, {"Location": "https://ci.bstein.dev/queue/item/9/"}
    )
    with pytest.raises(RuntimeError, match=f"HTTP {status}"):
        module.trigger_build("a" * 40, token_file=token, opener=response)


@pytest.mark.parametrize(
    "location",
    [
        "",
        "https://evil.invalid/queue/item/9/",
        "http://ci.bstein.dev/queue/item/9/",
        "https://ci.bstein.dev/job/hermes-agent-image/9/",
        "https://ci.bstein.dev/queue/item/9/?token=leak",
        "https://ci.bstein.dev/queue/item/9/#fragment",
        "https://ci.bstein.dev/queue/item/not-a-number/",
    ],
)
def test_trigger_rejects_missing_malformed_or_cross_origin_queue_location(
    tmp_path: Path, location: str
) -> None:
    """A real accepted status still needs the exact same-origin queue resource."""
    module = _load(TRIGGER_SCRIPT, "jenkins_trigger_location")
    token = tmp_path / "token"
    token.write_text("private\n", encoding="utf-8")
    response = lambda *_args, **_kwargs: Response(  # noqa: E731
        201, {"Location": location}
    )
    with pytest.raises(RuntimeError, match="Location"):
        module.trigger_build("b" * 40, token_file=token, opener=response)


def test_trigger_uses_https_and_accepts_exact_relative_queue_path(
    tmp_path: Path,
) -> None:
    """A relative plugin Location is resolved only against the fixed HTTPS origin."""
    module = _load(TRIGGER_SCRIPT, "jenkins_trigger_origin")
    token = tmp_path / "token"
    token.write_text("private\n", encoding="utf-8")
    captured = {}

    def opener(request, timeout):
        captured["url"] = request.full_url
        captured["timeout"] = timeout
        return Response(201, {"Location": "/queue/item/11/"})

    result = module.trigger_build("c" * 40, token_file=token, opener=opener)
    assert captured["url"].startswith("https://ci.bstein.dev/")
    assert captured["timeout"] == 20
    assert result["queue_path"] == "/queue/item/11/"