# coding=utf-8

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

id = 124
number = 31
visible = True
facts = None

solution = '''\
pivoting(_, [], [], []).
pivoting(P, [H|T], [H|S], G) :-
  H =< P,
  pivoting(P, T, S, G).
pivoting(P, [H|T], S, [H|G]) :-
  H > P,
  pivoting(P, T, S, G).
'''

test_cases = [
    ('pivoting(5, [], A, B)',
        [{'A': '[]', 'B': '[]'}]),
    ('pivoting(5, [6, 7, 6], A, B)',
        [{'A': '[]', 'B': '[6, 7, 6]'}]),
    ('pivoting(4, [2, 1, 8, 9, 3, 4, 2], A, B)',
        [{'A': '[2, 1, 3, 4, 2]', 'B': '[8, 9]'}]),
    ('pivoting(4, [22, 1, 0, 8, 3, 5, 7, -2], A, B)',
        [{'A': '[1, 0, 3, -2]', 'B': '[22, 8, 5, 7]'}]),
]

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
    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 []