# coding=utf-8

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

id = 104
number = 12
visible = True
facts = None

solution = '''\
conc([], L, L).
conc([H|T], L2, [H|L]) :-
  conc(T, L2, L).
'''

test_cases = [
    ('conc([j, b], [l], X)',
        [{'X': '[j, b, l]'}]),
    ('conc([a, r, u, e], [c, f], X)',
        [{'X': '[a, r, u, e, c, f]'}]),
    ('conc(X, [], [g, r])',
        [{'X': '[g, r]'}]),
    ('conc([], [], [])',
        [{}]),
]

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 []