# coding=utf-8

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

id = 121
number = 28
visible = True
facts = None

solution = '''\
is_sorted([]).
is_sorted([_]).
is_sorted([H1,H2|T]) :-
  H1 =< H2,
  is_sorted([H2|T]).
'''

test_cases = [
    ('is_sorted([])',
        [{}]),
    ('is_sorted([5, 6, 13, 555, 2111, 2112])',
        [{}]),
    ('is_sorted([2, 5, 5, 13, 555, 2111, 2112])',
        [{}]),
    ('is_sorted([-2])',
        [{}]),
    ('is_sorted([-42, -42, -42, -42])',
        [{}]),
    ('\+ is_sorted([3, 4, 5, 6, 1, 2, 3])',
        [{}]),
    ('\+ is_sorted([3, 4, 5, 6, 1, 2, 3, 0])',
        [{}]),
]

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:
        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 []