import re
from python.util import has_token_sequence, string_almost_equal, \
    string_contains_number, get_tokens, get_numbers, get_exception_desc, \
    all_tokens, has_comprehension, has_loop, almost_equal, get_ast
from server.hints import Hint

id = 20809
number = 9
visible = True

solution = '''\
def find_sum(xs, gs):
    if gs < 0:
        return False
    if gs == 0:
        return True
    if not xs:
        return False
    return find_sum(xs[1:], gs-xs[0]) or find_sum(xs[1:], gs)
'''

hint_type = {
    'final_hint': Hint('final_hint')
}

def test(python, code, aux_code=''):
    func_name = 'find_sum'
    tokens = get_tokens(code)
    if not has_token_sequence(tokens, ['def', func_name]):
        return False, [{'id' : 'no_func_name', 'args' : {'func_name' : func_name}}]

    in_out = [
        (([2,7,3,1,4], 10), True),
        (([2,3,2,4], 10), False),
        (([], 10), False),
        (([1,2,3], 2), True),
        (([1,2,3], 7), False),
        (([2,7,3,1,4], 9), True),
        (([2,7,3,2,4], 17), False),
    ]

    test_in = [('{0}{1}'.format(func_name, str(l[0])), None)
               for l in in_out]
    test_out = [l[1] for l in in_out]

    answers = python(code=aux_code+code, inputs=test_in, timeout=1.0)
    n_correct = 0
    tin, tout = None, None
    for i, (ans, to) in enumerate(zip(answers, test_out)):
        res = ans[0]
        corr = res == to
        n_correct += corr
        if not corr:
            tin = test_in[i][0]
            tout = to

    passed = n_correct == len(test_in)
    hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_in)}}]
    if tin:
        hints.append({'id': 'problematic_test_case', 'args': {'testin': str(tin), 'testout': str(tout)}})
    if passed:
        hints.append({'id': 'final_hint'})

    return passed, hints


def hint(python, code, aux_code=''):
    tokens = get_tokens(code)

    # run one test first to see if there are any exceptions
    answer = python(code=aux_code+code, inputs=[(None, None)], timeout=1.0)
    exc = get_exception_desc(answer[0][3])
    if exc: return exc

    return None