"""只读加载 api/tests/user_exports/*.md，供内部评测台对照（非生产数据路径）。"""

from __future__ import annotations

import re
from pathlib import Path

from app.features.evaluation.importers.user_export_markdown import (
    extract_dialogue_turns_from_export_md,
)

_SAFE_MD = re.compile(r"^[a-zA-Z0-9][a-zA-Z0-9_.-]*\.md$")


def user_exports_dir() -> Path:
    # api/app/features/evaluation/user_export_fixtures.py → api/
    return Path(__file__).resolve().parents[3] / "tests" / "user_exports"


def list_user_export_fixture_names() -> list[str]:
    root = user_exports_dir()
    if not root.is_dir():
        return []
    return sorted(p.name for p in root.glob("*.md"))


def read_user_export_fixture(filename: str) -> tuple[list[tuple[str, str]], str]:
    if not _SAFE_MD.match(filename):
        raise ValueError("invalid fixture filename")
    root = user_exports_dir()
    path = (root / filename).resolve()
    if path.parent != root.resolve() or not path.is_file():
        raise FileNotFoundError(filename)
    text = path.read_text(encoding="utf-8")
    turns = extract_dialogue_turns_from_export_md(text)
    return turns, text