"""Offline policy guards for the Void small-dependency templates (ticket #25).

Spec #16 (seam 2) closes the two easy Void dependency gaps — the X11
keyboard input library and the updated audio binding — as in-repo xbps
templates in void-packages layout under the packaging tree, with the audio
binding at or above the project's declared floor and no
verification-disabling template options anywhere.

These tests pin the templates to the project's own lockfile (`uv.lock`,
`requirements/runtime.txt`, `pyproject.toml`) so a template that drifts
from the locked versions, relaxes the floor, disables dependency
verification, or names a package that does not exist in void-packages fails
offline — the same contract as the native/AppImage policy tests.
"""

import re
import tomllib
from pathlib import Path

REPO_ROOT = Path(__file__).resolve().parents[1]
VOID = REPO_ROOT / "packaging" / "void"
SRC = VOID / "srcpkgs"
PINS = VOID / "tool_checksums.txt"
PYPROJECT = REPO_ROOT / "pyproject.toml"
RUNTIME = REPO_ROOT / "requirements" / "runtime.txt"
LOCK = REPO_ROOT / "uv.lock"

TEMPLATES = ("python3-pynput", "python3-PyAudio")

#: uv.lock package name per template directory name.
LOCK_NAMES = {"python3-pynput": "pynput", "python3-PyAudio": "pyaudio"}

#: Void package names covering pynput's linux-marked install_requires
#: (evdev>=1.3, python-xlib>=0.17, six) as recorded in uv.lock.
PYNPUT_LINUX_DEPS = ("python3-evdev", "python3-six", "python3-xlib")

#: Every package name the templates may reference, verified to exist in
#: void-packages master on 2026-11-05: python3-{evdev,six,xlib} and
#: python3-setuptools templates fetched and read; portaudio-devel and
#: python3-devel confirmed as subpackages of the portaudio/python3
#: templates. Re-verify with `xbps-query -Rs <name>` on a Void system
#: (or the srcpkgs tree on GitHub) before extending this set.
VERIFIED_VOID_PACKAGES = frozenset(
    {
        "python3",
        "python3-devel",
        "python3-setuptools",
        "python3-evdev",
        "python3-six",
        "python3-xlib",
        "portaudio-devel",
    }
)

#: Template options that switch off dependency verification. Ticket #25
#: resolves the audio version gap deliberately with an updated template,
#: never by hiding it behind one of these.
FORBIDDEN_VARS = ("noverifypydeps", "nopyprovides")

#: SPDX identifiers for the pinned versions (Void Manual: license must be
#: an SPDX expression). pynput 1.8.2 declares LGPLv3; PyAudio is MIT.
EXPECTED_LICENSES = {
    "python3-pynput": "LGPL-3.0-or-later",
    "python3-PyAudio": "MIT",
}

#: Void Manual mandatory variables, plus the fetch inputs every template
#: here must declare so nothing arrives from an unpinned URL.
MANDATORY_VARS = (
    "pkgname",
    "version",
    "revision",
    "short_desc",
    "maintainer",
    "license",
    "homepage",
    "build_style",
    "hostmakedepends",
    "distfiles",
    "checksum",
)


def _template_vars(name: str) -> dict:
    """Parse top-level VAR=value assignments from a void template file."""
    text = (SRC / name / "template").read_text(encoding="utf-8")
    variables = {}
    in_function = False
    for line in text.splitlines():
        stripped = line.strip()
        if not stripped or stripped.startswith("#"):
            continue
        if re.fullmatch(r"[A-Za-z0-9_+-]+\(\)\s*\{", stripped):
            in_function = True
            continue
        if in_function:
            if stripped == "}":
                in_function = False
            continue
        key, separator, value = stripped.partition("=")
        if not separator or not re.fullmatch(r"[A-Za-z_][A-Za-z0-9_]*", key):
            continue
        value = value.strip()
        if len(value) >= 2 and value[0] == value[-1] and value[0] in "\"'":
            value = value[1:-1]
        variables[key] = value
    return variables


def _locked_sdist(name: str) -> tuple:
    """Return (version, sdist sha256) for a package in uv.lock."""
    text = LOCK.read_text(encoding="utf-8")
    block = re.search(
        rf'^name = "{re.escape(name)}"\nversion = "([^"]+)"(.*?)(?=^\[\[package\]\]|\Z)',
        text,
        re.M | re.S,
    )
    assert block, f"{name} is missing from uv.lock"
    sdist = re.search(r'sdist = \{[^}]*hash = "sha256:([0-9a-f]{64})"', block.group(2))
    assert sdist, f"{name} has no hashed sdist in uv.lock"
    return block.group(1), sdist.group(1)


def _exported_version(name: str) -> str:
    """Return the pinned version from the hash-pinned runtime export."""
    match = re.search(
        rf"^{re.escape(name)}==([^\s;\\]+)",
        RUNTIME.read_text(encoding="utf-8"),
        re.M,
    )
    assert match, f"{name} is not pinned in requirements/runtime.txt"
    return match.group(1)


def _version_tuple(version: str) -> tuple:
    """Compare dotted versions without packaging (test-only helper)."""
    return tuple(int(part) for part in version.split("."))


def _project_specifier(name: str) -> str:
    """Return the full dependency clause for a pip name in pyproject.toml."""
    data = tomllib.loads(PYPROJECT.read_text(encoding="utf-8"))
    for dep in data["project"]["dependencies"]:
        pip_name = re.match(r"^([A-Za-z0-9._-]+)", dep).group(1).lower().replace("_", "-")
        if pip_name == name:
            return dep
    raise AssertionError(f"{name} is missing from pyproject.toml dependencies")


def _template_version(name: str) -> str:
    """Return the template version for a template directory name."""
    return _template_vars(name)["version"]


def _void_pins() -> dict:
    """Parse packaging/void/tool_checksums.txt (name -> kind, value, source)."""
    pins = {}
    for line in PINS.read_text(encoding="utf-8").splitlines():
        if not line.strip() or line.lstrip().startswith("#"):
            continue
        entry = line.split(None, 3)
        assert len(entry) == 4, f"unparseable pin line: {line!r}"
        pins[entry[0]] = (entry[1], entry[2], entry[3].strip())
    return pins


def test_templates_live_in_void_packages_layout() -> None:
    """Both templates sit where xbps-src expects them: srcpkgs/<pkgname>."""
    for name in TEMPLATES:
        template = SRC / name / "template"
        assert template.is_file(), f"{template} is missing"


def test_pkgname_matches_template_directory() -> None:
    """Void requires pkgname to match srcpkgs/<pkgname>."""
    for name in TEMPLATES:
        assert _template_vars(name)["pkgname"] == name, name


def test_mandatory_void_variables_are_present() -> None:
    """The Manual's mandatory variables plus fetch inputs must be set."""
    for name in TEMPLATES:
        variables = _template_vars(name)
        missing = [key for key in MANDATORY_VARS if not variables.get(key)]
        assert not missing, f"{name} is missing: {missing}"
        assert "python3-setuptools" in variables["hostmakedepends"].split(), name
    pyaudio = _template_vars("python3-PyAudio")
    assert "portaudio-devel" in pyaudio.get("makedepends", "").split()


def test_template_versions_match_lock_and_runtime_export() -> None:
    """Templates track the locked sdist versions, not newest upstream."""
    for name in TEMPLATES:
        version, _ = _locked_sdist(LOCK_NAMES[name])
        assert _template_version(name) == version, name
        assert _exported_version(LOCK_NAMES[name]) == version, name


def test_template_checksums_match_lock_sdist() -> None:
    """The template checksum is the hash uv already recorded for the sdist."""
    for name in TEMPLATES:
        _, digest = _locked_sdist(LOCK_NAMES[name])
        assert _template_vars(name)["checksum"] == digest, name


def test_audio_binding_satisfies_project_floor() -> None:
    """The updated template meets the declared floor it was built to close."""
    specifier = _project_specifier("pyaudio")
    template = _version_tuple(_template_version("python3-PyAudio"))
    for operator, floor in re.findall(r"(>=|==|~=|>)\s*([\d][\d.]*)", specifier):
        if operator == ">":
            assert template > _version_tuple(floor), specifier
        else:
            assert template >= _version_tuple(floor), specifier


def test_audio_binding_floor_was_not_relaxed() -> None:
    """Void's 0.2.12 stays below the floor: the floor itself never moved."""
    specifier = _project_specifier("pyaudio")
    lowers = [
        _version_tuple(floor)
        for operator, floor in re.findall(r"(>=|==|~=|>)\s*([\d][\d.]*)", specifier)
        if operator in (">=", "==", "~=", ">")
    ]
    assert lowers, f"pyaudio clause carries no lower bound: {specifier}"
    assert min(lowers) >= (0, 2, 13), f"floor relaxed to hide the gap: {specifier}"


def test_no_verification_disabling_options() -> None:
    """Dependency verification stays on; distfiles stay checksum-pinned."""
    for name in TEMPLATES:
        variables = _template_vars(name)
        for key in FORBIDDEN_VARS:
            assert key not in variables, f"{name} sets {key}"
        assert re.fullmatch(r"[0-9a-f]{64}", variables["checksum"]), name
        assert variables["distfiles"], name
        for moving in ("/master", "/main", "/continuous"):
            assert moving not in variables["distfiles"], f"{name}: {moving}"


def test_pynput_template_covers_linux_runtime_deps() -> None:
    """Every linux-marked install_requires of pynput resolves to a dep."""
    depends = set(_template_vars("python3-pynput").get("depends", "").split())
    missing = [dep for dep in PYNPUT_LINUX_DEPS if dep not in depends]
    assert not missing, f"python3-pynput depends is missing: {missing}"


def test_template_dependencies_exist_in_void_packages() -> None:
    """Template dependency lists name only verified void-packages names."""
    for name in TEMPLATES:
        variables = _template_vars(name)
        referenced = set()
        for key in ("depends", "hostmakedepends", "makedepends", "checkdepends"):
            for token in variables.get(key, "").split():
                if token.startswith("${"):
                    continue
                referenced.add(token)
        unknown = sorted(referenced - VERIFIED_VOID_PACKAGES)
        assert not unknown, f"{name} references unverified packages: {unknown}"


def test_void_container_base_image_is_digest_pinned() -> None:
    """The build container is pinned by index digest, like the other gates."""
    pins = _void_pins()
    assert "base-image" in pins, "base-image pin is missing"
    kind, value, source = pins["base-image"]
    assert kind == "docker", f"base-image kind is {kind}"
    assert "@sha256:" in value, "a tag is not a pin"
    assert source, "the source tag the digest came from must be recorded"


def test_void_template_metadata_shape() -> None:
    """Maintainer, license, and description follow the Manual's shapes."""
    for name in TEMPLATES:
        variables = _template_vars(name)
        assert re.fullmatch(
            r".+ <[^@<>\s]+@[^@<>\s]+>", variables["maintainer"]
        ), f"{name}: bad maintainer"
        assert "noreply" not in variables["maintainer"], name
        assert variables["license"] == EXPECTED_LICENSES[name], name
        assert len(variables["short_desc"]) <= 72, name
        assert re.fullmatch(r"[0-9][A-Za-z0-9.]*", variables["version"]), name
        assert variables["revision"].isdigit(), name