import cython

from ._dns cimport DNSQuestion


cdef cython.double _DUPLICATE_QUESTION_INTERVAL
cdef unsigned int _MAX_QUESTION_HISTORY_ENTRIES
cdef unsigned int _MAX_KNOWN_ANSWERS_PER_HISTORY_ENTRY

cdef class QuestionHistory:

    cdef public cython.dict _history

    cpdef void add_question_at_time(self, DNSQuestion question, double now, cython.set known_answers)

    @cython.locals(oldest=DNSQuestion, oldest_entry=cython.tuple, oldest_than=double)
    cdef void _evict_to_make_room(self, double now)

    @cython.locals(than=double, previous_question=cython.tuple, previous_known_answers=cython.set)
    cpdef bint suppresses(self, DNSQuestion question, double now, cython.set known_answers)

    @cython.locals(than=double, now_known_answers=cython.tuple)
    cpdef void async_expire(self, double now)