"""Remove data for user accounts that have been marked as deleted.

:Copyright: 2014-2025 Jochen Kupperschmidt
:License: Revised BSD (see `LICENSE` file for details)
"""

from collections.abc import Callable

import click
from sqlalchemy import delete

from byceps.database import db
from byceps.services.authn.password.dbmodels import DbCredential
from byceps.services.authn.session.dbmodels import DbRecentLogin, DbSessionToken
from byceps.services.authz.dbmodels import DbUserRole
from byceps.services.board.dbmodels.last_category_view import (
    DbLastCategoryView as DbBoardLastCategoryView,
)
from byceps.services.board.dbmodels.last_topic_view import (
    DbLastTopicView as DbBoardLastTopicView,
)
from byceps.services.consent.dbmodels import DbConsent
from byceps.services.newsletter.dbmodels import (
    DbSubscription as DbNewsletterSubscription,
    DbSubscriptionUpdate as DbNewsletterSubscriptionUpdate,
)
from byceps.services.user import user_service
from byceps.services.user.dbmodels.log import DbUserLogEntry
from byceps.services.user.models.user import UserID
from byceps.services.verification_token.dbmodels import DbVerificationToken

from _util import call_with_app_context


@click.command()
@click.option(
    '--dry-run',
    is_flag=True,
    help='determine but do not delete affected records',
)
@click.argument('user_ids', nargs=-1, required=True)
def execute(dry_run, user_ids) -> None:
    user_ids = set(user_ids)

    check_for_undeleted_accounts(user_ids)

    def delete(label: str, delete_func: Callable) -> None:
        delete_records(label, delete_func, user_ids)

    delete('authentication credentials', delete_authn_credentials)
    delete('recent logins', delete_authn_recent_logins)
    delete('session tokens', delete_authn_session_tokens)
    delete('authorization role assignments', delete_authz_user_roles)
    delete('board category view marks', delete_board_category_lastviews)
    delete('board topic view marks', delete_board_topic_lastviews)
    delete('consents', delete_consents)
    delete('newsletter subscriptions', delete_newsletter_subscriptions)
    delete(
        'newsletter subscription updates',
        delete_newsletter_subscription_updates,
    )
    delete('user log entries', delete_user_log_entries)
    delete('verification tokens', delete_verification_tokens)

    if not dry_run:
        db.session.commit()


def check_for_undeleted_accounts(user_ids: set[UserID]) -> None:
    users = user_service.get_users(user_ids)

    non_deleted_users = [u for u in users if not u.deleted]
    if non_deleted_users:
        user_ids_string = ', '.join(str(u.id) for u in non_deleted_users)
        raise click.BadParameter(
            f'These user accounts are not marked as deleted: {user_ids_string}'
        )


def delete_records(
    label: str, delete_func: Callable, user_ids: set[UserID]
) -> None:
    click.secho(f'Deleting {label} ... ', nl=False)
    affected = delete_func(user_ids)
    click.secho(str(affected), fg='yellow')


def delete_authn_credentials(user_ids: set[UserID]) -> int:
    """Delete authentication credentials for the given users."""
    return _execute_delete_for_users_query(DbCredential, user_ids)


def delete_authn_recent_logins(user_ids: set[UserID]) -> int:
    """Delete recent logins for the given users."""
    return _execute_delete_for_users_query(DbRecentLogin, user_ids)


def delete_authn_session_tokens(user_ids: set[UserID]) -> int:
    """Delete session tokens for the given users."""
    return _execute_delete_for_users_query(DbSessionToken, user_ids)


def delete_authz_user_roles(user_ids: set[UserID]) -> int:
    """Delete authorization role assignments from the given users."""
    return _execute_delete_for_users_query(DbUserRole, user_ids)


def delete_board_category_lastviews(user_ids: set[UserID]) -> int:
    """Delete last board category view marks for the given users."""
    return _execute_delete_for_users_query(DbBoardLastCategoryView, user_ids)


def delete_board_topic_lastviews(user_ids: set[UserID]) -> int:
    """Delete last board topic view marks for the given users."""
    return _execute_delete_for_users_query(DbBoardLastTopicView, user_ids)


def delete_consents(user_ids: set[UserID]) -> int:
    """Delete consents from the given users."""
    return _execute_delete_for_users_query(DbConsent, user_ids)


def delete_newsletter_subscriptions(user_ids: set[UserID]) -> int:
    """Delete newsletter subscriptions for the given users."""
    return _execute_delete_for_users_query(DbNewsletterSubscription, user_ids)


def delete_newsletter_subscription_updates(user_ids: set[UserID]) -> int:
    """Delete newsletter subscription updates for the given users."""
    return _execute_delete_for_users_query(
        DbNewsletterSubscriptionUpdate, user_ids
    )


def delete_user_log_entries(user_ids: set[UserID]) -> int:
    """Delete user log entries (except for those that justify the
    deletion) for the given users.
    """
    return db.session.execute(
        delete(DbUserLogEntry)
        .filter(DbUserLogEntry.user_id.in_(user_ids))
        .filter(DbUserLogEntry.event_type != 'user-deleted')
    )


def delete_verification_tokens(user_ids: set[UserID]) -> int:
    """Delete verification tokens for the given users."""
    return _execute_delete_for_users_query(DbVerificationToken, user_ids)


def _execute_delete_for_users_query(model, user_ids: set[UserID]) -> int:
    """Execute (but not commit) deletions, return number of affected rows."""
    result = db.session.execute(
        delete(model).filter(model.user_id.in_(user_ids))
    )
    return result.rowcount


if __name__ == '__main__':
    call_with_app_context(execute)