"""Adapter: opengrep --json normalized to Finding[]. Same JSON schema as semgrep (opengrep is a semgrep fork)."""
from __future__ import annotations

import json
import re

from scripts.manifest import Finding


_SEVERITY = {"ERROR": "high", "WARNING": "medium", "INFO": "low"}
_CWE_RE = re.compile(r"(CWE-\d+)")
_LOCAL_RULES_MARKER = "scripts.rules."


def _clean_rule_id(check_id: str) -> str:
    if _LOCAL_RULES_MARKER in check_id:
        return check_id.rsplit(_LOCAL_RULES_MARKER, 1)[-1]
    return check_id


def _cwe(meta: dict) -> str | None:
    raw = meta.get("cwe")
    if isinstance(raw, list) and raw:
        m = _CWE_RE.search(str(raw[0]))
        return m.group(1) if m else None
    if isinstance(raw, str):
        m = _CWE_RE.search(raw)
        return m.group(1) if m else None
    return None


def parse_opengrep_output(stdout: str) -> list[Finding]:
    try:
        payload = json.loads(stdout)
    except json.JSONDecodeError:
        return []
    out: list[Finding] = []
    for r in payload.get("results", []):
        extra = r.get("extra", {})
        metadata = extra.get("metadata", {})
        out.append(Finding(
            tool="opengrep",
            rule_id=_clean_rule_id(r.get("check_id", "")),
            severity=_SEVERITY.get(extra.get("severity", ""), "medium"),
            file=r.get("path", ""),
            line=r.get("start", {}).get("line", 0),
            end_line=r.get("end", {}).get("line", r.get("start", {}).get("line", 0)),
            message=extra.get("message", ""),
            cwe=_cwe(metadata),
        ))
    return out