import json
from app.ai.orchestrator import check_required_missing


class CompletionService:

    def is_complete(
        self,
        session,
        state,
    ) -> bool:
        """
        Clinical intake completion validation using the single source of truth:
        check_required_missing().

        Returns True only when:
        - Session status is already 'completed' or stage is 'confirmation', OR
        - All required categories (reason_for_visit, symptoms+duration,
          medical_history, medications, allergies) are either reported or confirmed_none.
        """
        if getattr(session, "status", None) == "completed" or getattr(session, "stage", None) == "confirmation":
            return True

        if not state or not getattr(state, "state_json", None):
            return False

        try:
            data = json.loads(state.state_json)
        except Exception:
            return False

        missing = check_required_missing(data)
        return len(missing) == 0