# coding=utf-8

import re
from python.util import has_token_sequence, string_almost_equal, \
    string_contains_number, get_tokens, get_numbers, get_exception_desc
from server.hints import Hint, HintSequence

id = 196
group = 'functions'
number = 2
visible = True

solution = '''\
def naj_abs(xs):
    naj = xs[0]
    for x in xs:
        if abs(x) > abs(naj):
            naj = x
    return naj
'''

hint_type = {
    'no_def': Hint('no_def'),
    'no_return': Hint('no_return'),
    'return_indent': Hint('return_indent'),
    'for_loop': Hint('for_loop'),
    'not_int': Hint('not_int'),
    'return_first': Hint('return_first'),
    'return_last': Hint('return_last'),
    'return_greatest': Hint('return_greatest'),
    'return_positive': Hint('return_positive'),
}


def test(python, code):
    test_in = [('naj_abs([6, 4, 2, 0])', None),
               ('naj_abs([4, 6, 2, 0])', None),
               ('naj_abs([4, 2, 6, 0])', None),
               ('naj_abs([4, 2, 0, 6])', None),
               ('naj_abs([6, -8, 2, 0])', None),
               ('naj_abs([-8, 6, 2, 0])', None),
               ('naj_abs([8, -6, -2, 0])', None),
               ('naj_abs([-5, -6, -2, -1])', None),
               ('naj_abs([-8, -1, -6, -2])', None),
               ('naj_abs([-1, -8, -6, -2])', None),
               ('naj_abs([42])', None),
               ('naj_abs([-42])', None)]

    test_out = [6, 6, 6, 6, -8, -8, 8, -6, -8, -8, 42, -42]

    answers = python(code=code, inputs=test_in, timeout=1.0)
    n_correct = sum(ans[0] == to for ans, to in zip(answers, test_out))
    return n_correct, len(test_in)

def hint(python, code):
    # run one test first to see if there are any exceptions
    answer = python(code=code, inputs=[('naj_abs([1, 3, 3, -6, 4, 3, 2])', None)], timeout=1.0)
    exc = get_exception_desc(answer)
    if exc: return exc

    tokens = get_tokens(code)
    print(tokens)
    # if has no def, tell him to define the function
    if not has_token_sequence(tokens, ['def']):
        return [{'id' : 'no_def'}]

    # if has no return, tell him to return the value
    if not has_token_sequence(tokens, ['return']):
        return [{'id' : 'no_return'}]

    # if has no loop, tell him to use it
    if not has_token_sequence(tokens, ['while']) and \
       not has_token_sequence(tokens, ['for']):
        return [{'id' : 'for_loop'}]

    # if has no condition if, tell him to use it
    if not has_token_sequence(tokens, ['if']):
        return [{'id' : 'if_clause'}]

    # test for wrong answers
    res = answer[0][0]
    if not isinstance(res, int):
        return [{'id' : 'not_int'}]
    cases = {
        1: [{'id' : 'return_first'}],
        2: [{'id' : 'return_last'}],
        4: [{'id' : 'return_greatest'}],
        6: [{'id' : 'return_positive'}]
    }
    if res in cases:
        return cases[res]

    # if has no return at the beginning of block,
    # tell not to return from for
    if not has_token_sequence(tokens, ['\n', 'return']):
        return [{'id' : 'return_indent'}]

    return None