from __future__ import annotations

import ast
from pathlib import Path

import pytest


_FEISHU_FILES = (
    "chat.py",
    "feishu_client.py",
)
_CREDENTIAL_NAMES = {"FEISHU_APP_ID", "FEISHU_APP_SECRET"}


@pytest.mark.parametrize("filename", _FEISHU_FILES)
def test_legacy_feishu_credentials_have_no_nonempty_fallback(filename: str) -> None:
    path = (
        Path(__file__).parents[1] / "agent" / "tools" / "builtin" / "feishu" / filename
    )
    tree = ast.parse(path.read_text(encoding="utf-8"), filename=str(path))

    for node in ast.walk(tree):
        if not isinstance(node, ast.Call) or not isinstance(node.func, ast.Attribute):
            continue
        if node.func.attr != "getenv" or not node.args:
            continue
        name = node.args[0]
        if not isinstance(name, ast.Constant) or name.value not in _CREDENTIAL_NAMES:
            continue
        if len(node.args) > 1:
            fallback = node.args[1]
            assert isinstance(fallback, ast.Constant)
            assert fallback.value in {None, ""}

    for node in ast.walk(tree):
        if not isinstance(node, ast.Assign) or not isinstance(node.value, ast.Constant):
            continue
        for target in node.targets:
            if not isinstance(target, ast.Subscript):
                continue
            key = target.slice
            if isinstance(key, ast.Constant) and key.value in _CREDENTIAL_NAMES:
                assert node.value.value in {None, ""}