"""Detect NumPy calls that change process-wide error or display policy."""
from __future__ import annotations
import argparse, ast
from pathlib import Path
from scripts.audit_common import print_failures, production_python_files, require_root
_MUTATORS={"seterr","seterrcall","set_printoptions"}
def audit_source(source:str)->list[str]:
    try: tree=ast.parse(source)
    except SyntaxError: return []
    out=[]
    for n in ast.walk(tree):
        if isinstance(n,ast.Call) and isinstance(n.func,ast.Attribute) and isinstance(n.func.value,ast.Name) and n.func.value.id in {"np","numpy"} and n.func.attr in _MUTATORS:
            out.append(f"NumPy global state mutation via {n.func.attr}() on line {n.lineno}")
    return out
def audit(root:Path)->list[str]:
    root=require_root(root); out=[]
    for rel in production_python_files(root):
        try: src=(root/rel).read_text(encoding="utf-8")
        except (OSError,UnicodeDecodeError): continue
        out.extend(f"{rel}: {x}" for x in audit_source(src))
    return out
def main(argv=None):
    p=argparse.ArgumentParser(description=__doc__); p.add_argument("root",nargs="?",default="."); return print_failures(audit(Path(p.parse_args(argv).root)))
if __name__=="__main__": raise SystemExit(main())