# coding=utf-8

from operator import itemgetter
import prolog.engine
import server.problems

id = 125
number = 32
visible = False
facts = None

solution = '''\
conc125([], L, L).
conc125([H|T], L2, [H|L]) :-
  conc125(T, L2, L).
pivoting125(_, [], [], []).
pivoting125(P, [H|T], [H|S], G) :-
  H =< P,
  pivoting125(P, T, S, G).
pivoting125(P, [H|T], S, [H|G]) :-
  H > P,
  pivoting125(P, T, S, G).
quick_sort([], []).
quick_sort([Pivot|T], Sorted) :-
  pivoting125(Pivot, T, Smaller, Greater),
  quick_sort(Smaller, SortedSmaller),
  quick_sort(Greater, SortedGreater),
  conc125(SortedSmaller, [Pivot|SortedGreater], Sorted).
'''

test_cases = [
    ('quick_sort([], X)',
        [{'X': '[]'}]),
    ('quick_sort([5, 3, 5, 5, 1, 2, 0], X)',
        [{'X': '[0, 1, 2, 3, 5, 5, 5]'}]),
    ('quick_sort([2, 1, 3, 5, 6, 0, 22, 3], X)',
        [{'X': '[0, 1, 2, 3, 3, 5, 6, 22]'}]),
    ('quick_sort([5, 4, 3, 2, 1], X)',
        [{'X': '[1, 2, 3, 4, 5]'}]),
]

def test(code, aux_code):
    n_correct = 0
    engine_id = None
    try:
        engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0)
        if engine_id is not None and 'error' not in map(itemgetter(0), output):
            # Engine successfully created, and no syntax error in program.
            for query, answers in test_cases:
                if prolog.engine.check_answers(engine_id, query=query, answers=answers, timeout=1.0):
                    n_correct += 1
    except socket.timeout:
        pass
    finally:
        if engine_id:
            prolog.engine.destroy(engine_id)

    hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_cases)}}]
    return n_correct, len(test_cases), hints

def hint(code, aux_code):
    # TODO
    return []