"""muse#91 — semver classifier flags breaking_changes on a reorder-only diff
despite its own "no semantic change" summary.

Root cause: `build_diff_ops()` (muse/plugins/code/symbol_diff.py) falls back
to a whole-file ReplaceOp labeled "<path> (reformatted -- no semantic
change)" when every symbol's content_id in a modified file is unchanged --
e.g. a pure reorder of two top-level functions, or a comment-only edit
(muse#92). `_classify_replace()` (muse/core/semver_classifier.py) pattern-
matches `new_summary` for "renamed to"/"signature"/"implementation" but had
no case for this exact fallback text, so it fell through to the conservative
"unrecognised summary" catch-all and was classified breaking/minor --
directly contradicting the op's own "no semantic change" claim one field
over.

Fixed by adding a recognized branch for "no semantic change" in
`_classify_replace()`, classifying it `invisible` (no API impact, no bump).

Reproduces the ticket's exact repro steps through the real CLI: commit a
file with two functions, commit again with ONLY their order swapped, and
assert the resulting commit's structured_delta reports sem_ver_bump="none"
and breaking_changes=[].
"""
from __future__ import annotations

import json
import os
import pathlib

from tests.cli_test_helper import CliRunner, InvokeResult

runner = CliRunner()


def _run(repo: pathlib.Path, *args: str) -> InvokeResult:
    saved = os.getcwd()
    try:
        os.chdir(repo)
        return runner.invoke(None, list(args))
    finally:
        os.chdir(saved)


def test_reorder_only_diff_is_zero_bump_and_not_breaking(tmp_path: pathlib.Path) -> None:
    repo = tmp_path
    r = _run(repo, "init")
    assert r.exit_code == 0, r.stderr

    (repo / "extra.py").write_text(
        "def helper_a(x):\n    return x\n\n\ndef helper_b(x):\n    return x * 2\n"
    )
    r = _run(repo, "code", "add", "extra.py")
    assert r.exit_code == 0, r.stderr
    r = _run(repo, "commit", "-m", "base")
    assert r.exit_code == 0, r.stderr

    # Reorder only -- swap the two functions, no other edits.
    (repo / "extra.py").write_text(
        "def helper_b(x):\n    return x * 2\n\n\ndef helper_a(x):\n    return x\n"
    )
    r = _run(repo, "code", "add", "extra.py")
    assert r.exit_code == 0, r.stderr
    r = _run(repo, "commit", "-m", "reorder only")
    assert r.exit_code == 0, r.stderr

    r = _run(repo, "read-commit", "HEAD", "--json")
    assert r.exit_code == 0, r.stderr
    delta = json.loads(r.output)["structured_delta"]

    assert delta["sem_ver_bump"] == "none", (
        f"reorder-only diff must not trigger a version bump: {delta}"
    )
    assert delta["breaking_changes"] == [], (
        f"reorder-only diff must not be flagged breaking: {delta}"
    )