"""Adapter: radon cc -j JSON output → Finding[]."""
from __future__ import annotations

import json

from scripts.manifest import Finding


def _severity_for_complexity(cc: int) -> str | None:
    if cc >= 20:
        return "high"
    if cc >= 10:
        return "medium"
    return None


def parse_radon_output(stdout: str) -> list[Finding]:
    try:
        payload = json.loads(stdout)
    except json.JSONDecodeError:
        return []
    if not isinstance(payload, dict):
        return []
    out: list[Finding] = []
    for file_path, items in payload.items():
        if not isinstance(items, list):
            continue
        for item in items:
            cc = item.get("complexity", 0)
            severity = _severity_for_complexity(cc)
            if severity is None:
                continue
            line = item.get("lineno", 0)
            end_line = item.get("endline", line)
            name = item.get("name", "?")
            kind = item.get("type", "function")
            out.append(Finding(
                tool="radon",
                rule_id=f"radon:cc={cc}",
                severity=severity,
                file=file_path,
                line=line,
                end_line=end_line,
                message=f"high cyclomatic complexity (CCN={cc}) in {kind} {name}",
            ))
    return out