"""Local email/password authentication provider."""

import logging

from app.gateway.auth.models import User
from app.gateway.auth.password import hash_password_async, verify_account_password
from app.gateway.auth.providers import AuthProvider
from app.gateway.auth.repositories.base import UserRepository

logger = logging.getLogger(__name__)


class LocalAuthProvider(AuthProvider):
    """Email/password authentication provider using local database."""

    def __init__(self, repository: UserRepository):
        """Initialize with a UserRepository.

        Args:
            repository: UserRepository implementation (SQLite)
        """
        self._repo = repository

    async def authenticate(self, credentials: dict) -> User | None:
        """Authenticate with email and password.

        Args:
            credentials: dict with 'email' and 'password' keys

        Returns:
            User if authentication succeeds, None otherwise
        """
        email = credentials.get("email")
        password = credentials.get("password")

        if not email or not password:
            return None

        user = await self._repo.get_user_by_email(email)
        if user is None:
            return None

        if not await verify_account_password(password, user):
            return None

        return user

    async def get_user(self, user_id: str) -> User | None:
        """Get user by ID."""
        return await self._repo.get_user_by_id(user_id)

    async def get_users_by_ids(self, user_ids: list[str]) -> list[User]:
        """Resolve many account owners with one repository read."""
        return await self._repo.get_users_by_ids(user_ids)

    async def find_user_by_email_local_part(self, local_part: str) -> User | None:
        """Find a user whose email starts with ``local_part@`` regardless of domain.

        Used by the passwordless username-login flow to keep a single
        username mapped to the same account across legacy / canonical
        email-domain defaults.
        """
        return await self._repo.find_user_by_email_local_part(local_part)

    async def find_users_by_email_local_part_like(self, substring: str, *, limit: int = 500) -> list[User]:
        """Fuzzy-match users by a substring of their email local part.

        Backs the admin LLM-metrics username filter — returns every account
        whose username contains ``substring`` (case-insensitive).
        """
        return await self._repo.find_users_by_email_local_part_like(substring, limit=limit)

    async def create_user(self, email: str, password: str | None = None, system_role: str = "user", needs_setup: bool = False, approved: bool = True) -> User:
        """Create a new local user.

        Args:
            email: User email address
            password: Plain text password (will be hashed)
            system_role: Role to assign ("admin" or "user")
            needs_setup: If True, user must complete setup on first login
            approved: Login-whitelist 放行标记. **黑名单模式**:新账号默认 ``True``
                (从未登录过的用户首次登录即放行),管理员可在白名单管理页对个别
                用户「取消放行」(置 ``False``) 来封禁。仅当 ``login_whitelist.enabled``
                打开时 ``approved=False`` 才会被拦。

        Returns:
            Created User instance
        """
        password_hash = await hash_password_async(password) if password else None
        user = User(
            email=email,
            password_hash=password_hash,
            login_password=password_hash,
            system_role=system_role,
            needs_setup=needs_setup,
            approved=approved,
        )
        return await self._repo.create_user(user)

    async def get_user_by_oauth(self, provider: str, oauth_id: str) -> User | None:
        """Get user by OAuth provider and ID."""
        return await self._repo.get_user_by_oauth(provider, oauth_id)

    async def create_initial_admin(self, email: str, password: str) -> User:
        hashed = await hash_password_async(password)
        user = User(email=email.strip().lower(), password_hash=hashed, login_password=hashed, system_role="admin", approved=True)
        return await self._repo.create_initial_admin(user)

    async def count_users(self) -> int:
        """Return total number of registered users."""
        return await self._repo.count_users()

    async def count_admin_users(self) -> int:
        """Return number of admin users."""
        return await self._repo.count_admin_users()

    async def update_user(self, user: User) -> User:
        """Update an existing user."""
        return await self._repo.update_user(user)

    async def update_credentials(self, user: User, password_hash: str | None, *, email: str | None = None) -> User:
        """Rotate both password representations and invalidate prior sessions."""
        return await self._repo.update_credentials(user, password_hash, email=email)

    async def start_login_session(self, user: User) -> User:
        return await self._repo.start_login_session(user)

    async def list_users(self) -> list[User]:
        """Return all registered users ordered by creation date."""
        return await self._repo.list_users()

    async def list_users_page(
        self, *, q: str | None = None, limit: int = 20, offset: int = 0
    ) -> list[User]:
        """Return one page of users (optionally filtered by ``q``)."""
        return await self._repo.list_users_page(q=q, limit=limit, offset=offset)

    async def count_users_filtered(
        self, *, q: str | None = None, approved_or_admin: bool = False
    ) -> int:
        """Count users with the same ``q`` filter; optionally approved/admin only."""
        return await self._repo.count_users_filtered(q=q, approved_or_admin=approved_or_admin)

    async def get_user_by_email(self, email: str) -> User | None:
        """Get user by email."""
        return await self._repo.get_user_by_email(email)