"""Provider-neutral, read-only busy-time interface."""
from typing import Protocol

from app.core.database import execute_query


class BusyTimeProvider(Protocol):
    def get_busy(self, user_ids: list[int], starts_at, ends_at) -> list[dict]: ...
    def statuses(self, user_ids: list[int]) -> list[dict]: ...


class DatabaseBusyTimeProvider:
    """Cache adapter used by Outlook/Google sync jobs without exposing meeting data."""

    def get_busy(self, user_ids, starts_at, ends_at):
        if not user_ids:
            return []
        return execute_query(
            """SELECT user_id, starts_at, ends_at, provider FROM planner_external_busy
               WHERE user_id = ANY(%s) AND starts_at < %s AND ends_at > %s""",
            (user_ids, ends_at, starts_at),
        ) or []

    def statuses(self, user_ids):
        if not user_ids:
            return []
        return execute_query(
            """SELECT user_id, provider, status, last_success_at, last_error_at
               FROM planner_integrations WHERE user_id = ANY(%s)""",
            (user_ids,),
        ) or []


busy_time_provider: BusyTimeProvider = DatabaseBusyTimeProvider()