"""Adapter: eslint -f json normalized to Finding[]."""
from __future__ import annotations

import json
import os

from scripts.manifest import Finding


def _severity(rule_id: str, sev_num: int) -> str:
    if rule_id and "security" in rule_id:
        return "high"
    if sev_num == 2:
        return "medium"
    return "low"


def parse_eslint_output(stdout: str, repo_root: str) -> list[Finding]:
    try:
        payload = json.loads(stdout)
    except json.JSONDecodeError:
        return []
    if not isinstance(payload, list):
        return []
    out: list[Finding] = []
    for entry in payload:
        file_path = entry.get("filePath", "")
        rel = os.path.relpath(file_path, repo_root) if file_path.startswith(repo_root) else file_path
        for msg in entry.get("messages", []):
            rule_id = msg.get("ruleId") or ""
            out.append(Finding(
                tool="eslint",
                rule_id=rule_id,
                severity=_severity(rule_id, msg.get("severity", 1)),
                file=rel,
                line=msg.get("line", 0),
                end_line=msg.get("endLine", msg.get("line", 0)),
                message=msg.get("message", ""),
            ))
    return out