"""Custom per-test signals for the standard JUnit reporter.

The e2e suite ships results to Loki/Grafana from a standard pytest JUnit report
(`--junitxml=e2e-report.xml`), not a bespoke log line. JUnit already records
outcome, duration, and node id for every `<testcase>`; the signals it cannot
derive on its own are the normalized suite package, the coverage-registry cell
ids a test covers, and where the test's source lives. Those ride along as JUnit
`<property>` entries via each item's `user_properties`, attached in
`conftest.py::pytest_collection_modifyitems`.

`source` is a property rather than the `file=` / `line=` attributes pytest used
to write, because the `xunit2` family this suite runs on drops those, and
switching families would change the XML for every consumer of it -- the
Buildkite Test Engine upload and the Loki pipeline included.
"""

from __future__ import annotations

from collections.abc import Iterable

import pytest
from coverage_registry.management_cases import case_properties
from e2e_metadata import step_properties, subject_properties

# Hardcoded because the runner image copies tests/e2e/ to /app/e2e, so nothing
# at runtime names this suite's place in the repo. test_junit_properties.py
# fails from a checkout if it moves.
SUITE_ROOT = "tests/e2e"


def suite_parts(path_part: str) -> tuple[str, ...]:
    """Path components of a suite file relative to tests/e2e, however it ran.

    Pytest paths are rootdir-relative, and rootdir moves with the invocation: a
    repo-root run gives `tests/e2e/logging/test_x.py`, a suite-cwd run (the
    runner image) gives `logging/test_x.py`. Both collapse to the same tuple.
    """
    raw = tuple(p for p in path_part.replace("\\", "/").split("/") if p and p != ".")
    return raw[2:] if len(raw) >= 3 and raw[0] == "tests" and raw[1] == "e2e" else raw


def package_from_nodeid(nodeid: str) -> str:
    """Top-level suite package under tests/e2e/, or 'root' for top-level files."""
    parts = suite_parts(nodeid.split("::", 1)[0])
    if len(parts) <= 1:
        return "root"
    return parts[0]


def source_from_location(path: str, lineno: int | None) -> str:
    """Repo-relative `path:line` for a test, or '' when nothing is linkable.

    `pytest.Item.location` gives a rootdir-relative path and a ZERO-based line.
    The path is re-rooted at SUITE_ROOT so consumers need not know how pytest was
    started, and the line is emitted ONE-based to match editors, tracebacks and
    code hosts. A decorated test anchors at its first decorator, which is where
    pytest reports it.

    Empty rather than a guess for anything unlinkable: no line, a path reaching
    upward, or a path carrying a colon, which is both how an absolute Windows
    path arrives and a character `path:line` has no way to represent.
    """
    if lineno is None:
        return ""
    normalized = path.replace("\\", "/")
    if normalized.startswith("/") or ":" in normalized or ".." in normalized.split("/"):
        return ""
    parts = suite_parts(normalized)
    if not parts:
        return ""
    return f"{'/'.join((SUITE_ROOT, *parts))}:{lineno + 1}"


def source_from_item(item: pytest.Item) -> str:
    """Read the repo-relative `path:line` off a pytest Item's reported location."""
    path, lineno, _ = item.location
    return source_from_location(path, lineno)


def dedupe_covers(marker_args: Iterable[tuple[object, ...]]) -> tuple[str, ...]:
    """Flatten @pytest.mark.covers arg lists into unique, order-preserving cell
    ids, dropping anything that is not a non-empty string."""
    return tuple(dict.fromkeys(arg for args in marker_args for arg in args if isinstance(arg, str) and arg))


def covers_from_item(item: pytest.Item) -> tuple[str, ...]:
    """Read @pytest.mark.covers cell ids off a pytest Item, order-preserving."""
    return dedupe_covers(marker.args for marker in item.iter_markers(name="covers"))


def result_properties(item: pytest.Item) -> tuple[tuple[str, str], ...]:
    """The custom signals a standard reporter cannot derive.

    Loki, Grafana and tests/integration/conftest.py read the `package`/`covers`/`source` prefix, so it never moves
    """
    fixed = (
        ("package", package_from_nodeid(item.nodeid)),
        ("covers", ",".join(covers_from_item(item))),
        ("source", source_from_item(item)),
    )
    return fixed + case_properties(item.nodeid) + subject_properties(item)


def attach_result_properties(item: pytest.Item) -> None:
    """Attach result_properties to an item's user_properties, idempotently: a
    second call is a no-op, so a collection that runs the hook more than once
    never emits duplicate <property> entries."""
    if any(name == "package" for name, _ in item.user_properties):
        return
    item.user_properties.extend(result_properties(item))


def attach_step_properties(item: pytest.Item) -> None:
    """Attach the runtime-recorded steps; called after setup and after call.

    Separate from `attach_result_properties` because it cannot share its home:
    that one runs in `pytest_collection_modifyitems`, before any test body has
    executed, so the recorder is necessarily empty there.

    Any `step` entries already on the item are dropped first, which is what makes
    the second call of a test safe: the story attached after setup is replaced by
    the longer one attached after call. It also covers `--reruns 1`, where a flaky
    test's second attempt would otherwise append a second copy of the story behind
    the first, and the report would read as one very long test that did everything
    twice. Last attempt wins, which is the attempt whose outcome JUnit records.
    """
    item.user_properties[:] = [entry for entry in item.user_properties if entry[0] != "step"]
    item.user_properties.extend(step_properties())