"""User accounts + persistent per-user chat history for AgAdvisor.

Self-contained package so it can be unit-tested without Streamlit, Hugging Face,
or the RAG stack:

- ``store``   — SQLite schema + user-scoped CRUD (users, chats, messages, usage)
- ``auth``    — bcrypt password hashing, signup/login, brute-force lockout
- ``session`` — HMAC-signed session tokens for cookie-based "stay logged in"
- ``hf_sync`` — mirror the SQLite DB to a private Hugging Face Dataset (durable
                storage on ephemeral Spaces); no-ops locally when no token is set
- ``ui``      — Streamlit login/sign-up gate (imported lazily; needs streamlit)

Submodules are imported lazily via ``__getattr__`` so that using only ``store``
or ``session`` does not pull in optional deps (``bcrypt``) that ``auth`` needs.
"""

from __future__ import annotations

import importlib
from typing import Any

__all__ = [
    "AccountStore",
    "DuplicateUserError",
    "AuthError",
    "signup",
    "login",
    "hash_password",
    "verify_password",
    "issue_token",
    "validate_token",
]

_EXPORTS = {
    "AccountStore": ("store", "AccountStore"),
    "DuplicateUserError": ("store", "DuplicateUserError"),
    "AuthError": ("auth", "AuthError"),
    "signup": ("auth", "signup"),
    "login": ("auth", "login"),
    "hash_password": ("auth", "hash_password"),
    "verify_password": ("auth", "verify_password"),
    "issue_token": ("session", "issue_token"),
    "validate_token": ("session", "validate_token"),
}


def __getattr__(name: str) -> Any:  # PEP 562 lazy attribute access
    if name in _EXPORTS:
        module_name, attr = _EXPORTS[name]
        module = importlib.import_module(f"{__name__}.{module_name}")
        return getattr(module, attr)
    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")