"""Adapter: luac -p stderr normalized to Finding[]."""
from __future__ import annotations

import re

from scripts.manifest import Finding


_PATTERN = re.compile(r"^luac:\s+(.+?):(\d+):\s+(.+)$")


def parse_luac_output(stderr: str, repo_root: str = "") -> list[Finding]:
    out: list[Finding] = []
    prefix = repo_root.rstrip("/") + "/" if repo_root else ""
    for line in stderr.splitlines():
        m = _PATTERN.match(line.strip())
        if not m:
            continue
        filepath, lineno_str, message = m.group(1), m.group(2), m.group(3)
        if prefix and filepath.startswith(prefix):
            filepath = filepath[len(prefix):]
        lineno = int(lineno_str)
        out.append(Finding(
            tool="luac",
            rule_id="syntax-error",
            severity="critical",
            file=filepath,
            line=lineno,
            end_line=lineno,
            message=message,
        ))
    return out