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# coding=utf-8

from python.util import has_token_sequence, string_almost_equal
from server.hints import Hint, HintSequence

id = 188
group = 'introduction'
number = 2
visible = True

solution = '''\
from math import *
a = float(input("Prva kateta: "))
b = float(input("Druga kateta: "))
c = sqrt(a ** 2 + b ** 2)
print("Hipotenuza trikotnika s stranicama", a, "in", b, "je", c)
'''

hint_type = {
    'plan': Hint('plan'),
    'name_error': HintSequence('name_error', 4),
    'unsupported_operand': HintSequence('unsupported_operand', 4),
    'no_input_call' : Hint('no_input_call'),
    'printing': Hint('printing'),
    'math_functions': Hint('math_functions')
}

def test(python, code):
    # List of inputs: (expression to eval, stdin).
    test_in = [
        (None, '3\n4\n'),
        (None, '4\n3\n'),
        (None, '12\n5\n'),
        (None, '5\n12\n'),
        (None, '5\n0\n'),
        (None, '0\n5\n'),
        (None, '1\n1\n'),
    ]

    test_out = [
        5,
        5,
        13,
        13,
        5,
        5,
        1.414
    ]

    # List of outputs: (expression result, stdout, stderr, exception).
    answers = python(code=code, inputs=test_in, timeout=1.0)
    outputs = [ans[1] for ans in answers]

    n_correct = 0
    for output, correct in zip(outputs, test_out):
        if string_almost_equal(output, float(correct)):
            n_correct += 1
    return n_correct, len(test_in)

def hint(python, code):
    # run one test first to see if there are any exceptions
    test_in = [(None, '3\n4\n')]
    answer = python(code=code, inputs=test_in, timeout=1.0)
    exc = answer[0][3]
    # if have an exception!
    if exc:
        if 'NameError' in exc:
            return [{'id':'name_error', 'args': {'message': exc}}]
        if 'unsupported operand' in exc or 'TypeError' in exc:
            return [{'id':'unsupported_operand', 'args': {'message': exc}}]

    # show plan if student is lost
    if len(code.strip()) < 5 or (not has_token_sequence(code, ['input']) and
                    (has_token_sequence(code, ['pi']) or 
                     has_token_sequence(code, ['sin']) or 
                     has_token_sequence(code, ['print']))):
        return [{'id': 'plan'}]


    # if input is not present in code, student needs to learn about input
    if not has_token_sequence(code, ['input']) or \
       not has_token_sequence(code, ['float']):
        return [{'id': 'no_input_call'}]

    # if tokens sqrt or ** are not in code, we have to teach them how to 
    # use math functions.
    if  (not has_token_sequence(code, ['sqrt']) or
        not has_token_sequence(code, ['**'])):
        return [{'id' : 'math_functions'}]

    # student is not using print function
    if not has_token_sequence(code, ['print']):
        return [{'id' : 'printing'}]

    return None