from .moves cimport BEGIN, UNIT


cdef int begin_entity(State* s, label) except -1:
    s.j += 1
    s.ents[s.j].start = s.i
    s.ents[s.j].label = label


cdef int end_entity(State* s) except -1:
    s.ents[s.j].end = s.i + 1


cdef State* init_state(Pool mem, int sent_length) except NULL:
    s = <State*>mem.alloc(1, sizeof(State))
    s.j = -1
    s.ents = <Entity*>mem.alloc(sent_length, sizeof(Entity))
    for i in range(sent_length):
        s.ents[i].label = -1
    s.tags = <int*>mem.alloc(sent_length, sizeof(int))
    s.length = sent_length
    return s


cdef bint entity_is_open(State *s) except -1:
    return s.j >= 0 and s.ents[s.j].label != -1


cdef bint entity_is_sunk(State *s, Move* golds) except -1:
    if not entity_is_open(s):
        return False

    cdef Entity* ent = &s.ents[s.j]
    cdef Move* gold = &golds[ent.start]
    if gold.action != BEGIN and gold.action != UNIT:
        return True
    elif gold.label != ent.label:
        return True
    else:
        return False