#     Copyright 2020, Kay Hayen, mailto:kay.hayen@gmail.com
#
#     Python tests originally created or extracted from other peoples work. The
#     parts were too small to be protected.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.
#
""" Various kinds of functions with small specialties.

"""

from __future__ import print_function

import inspect
import sys

# pylint: disable=redefined-outer-name


var_on_module_level = 1


def closureTest1(some_arg):  # pylint: disable=unused-argument
    x = 3

    def enclosed(_f="default_value"):
        return x

    return enclosed


print("Call closured function returning function:", closureTest1(some_arg="ignored")())


def closureTest2(some_arg):  # pylint: disable=unused-argument
    def enclosed(_f="default_value"):
        return x

    x = 4

    return enclosed


print("Call closured function returning function:", closureTest2(some_arg="ignored")())


def defaultValueTest1(_no_default, some_default_constant=1):
    return some_default_constant


print(
    "Call function with 2 parameters, one defaulted, and check that the default value is used:",
    defaultValueTest1("ignored"),
)


def defaultValueTest1a(
    _no_default, some_default_constant_1=1, some_default_constant_2=2
):
    return some_default_constant_2 - some_default_constant_1


print(
    "Call function with 3 parameters, 2 defaulted, check they are used correctly:",
    defaultValueTest1a("ignored"),
)


def defaultValueTest2(_no_default, some_default_variable=var_on_module_level * 2):
    return some_default_variable


print(
    "Call function with 2 parameters, 1 defaulted with an expression, check its result",
    defaultValueTest2("ignored"),
)

var_on_module_level = 2
print(
    "Call function with 2 parameters, 1 defaulted with an expression, values have changed since, check its result",
    defaultValueTest2("ignored"),
)


def contractionTest():
    j = 2

    return [j + i for i in range(8)]


print("Call function that returns a list contraction:", contractionTest())


def defaultValueTest3a(
    _no_default, funced_defaulted=defaultValueTest2(var_on_module_level)
):
    return [i + funced_defaulted for i in range(8)]


print(
    "Call function that has a default value coming from a function call:",
    defaultValueTest3a("ignored"),
)


def defaultValueTest3b(
    _no_default, funced_defaulted=defaultValueTest2(var_on_module_level)
):
    local_var = [funced_defaulted + i for i in range(8)]

    return local_var


print(
    "Call function that returns a list contraction result via a local variable:",
    defaultValueTest3b("ignored"),
)


def defaultValueTest3c(
    _no_default, funced_defaulted=defaultValueTest2(var_on_module_level)
):
    local_var = [[j + funced_defaulted + 1 for j in range(i)] for i in range(8)]

    return local_var


print(
    "Call function that returns a nested list contraction with input from default parameter",
    defaultValueTest3c("ignored"),
)


def defaultValueTest4(_no_default, funced_defaulted=lambda x: x ** 2):
    return funced_defaulted(4)


print(
    "Call function that returns value calculated by a lambda function as default parameter",
    defaultValueTest4("ignored"),
)


def defaultValueTest4a(_no_default, funced_defaulted=lambda x: x ** 2):
    c = 1
    d = funced_defaulted(1)

    r = (i + j + c + d for i, j in zip(range(8), range(9)))

    l = []
    for x in r:
        l.append(x)

    return l


print(
    "Call function that has a lambda calculated default parameter and a generator expression",
    defaultValueTest4a("ignored"),
)


def defaultValueTest4b(_no_default, funced_defaulted=lambda x: x ** 3):
    d = funced_defaulted(1)

    # Nested generators
    l = []

    for x in ((d + j for j in range(4)) for i in range(8)):
        for y in x:
            l.append(y)

    return l


print(
    "Call function that has a lambda calculated default parameter and a nested generator expression",
    defaultValueTest4b("ignored"),
)


def defaultValueTest5(_no_default, tuple_defaulted=(1, 2, 3)):
    return tuple_defaulted


print("Call function with default value that is a tuple", defaultValueTest5("ignored"))


def defaultValueTest6(
    _no_default, list_defaulted=[1, 2, 3]
):  # pylint: disable=dangerous-default-value
    return list_defaulted


print("Call function with default value that is a list", defaultValueTest6("ignored"))


x = len("hey")

# TODO: Doesn't belong here.
def in_test(a):
    # if 7 in a:
    #   print "hey"

    # pylint: disable=pointless-statement
    8 in a  # @NoEffect
    9 not in a  # @NoEffect


in_test([8])
try:
    in_test(9)
except TypeError:
    pass


def my_deco(function):
    def new_function(c, d):
        return function(d, c)

    return new_function


@my_deco
def decoriert(a, b):  # pylint: disable=unused-argument
    def subby(a):
        return 2 + a

    return 1 + subby(b)


print("Function with decoration", decoriert(3, 9))


def functionWithGlobalReturnValue():

    global a  # pylint: disable=global-statement
    return a


a = "oh common"

some_constant_tuple = (2, 5, 7)
some_semiconstant_tuple = (2, 5, a)

f = a * 2

print(defaultValueTest1("ignored"))

# The change of the default variable doesn't influence the default
# parameter of defaultValueTest2, that means it's also calculated
# at the time the function is defined.
module_level = 7
print(defaultValueTest2("also ignored"))


def starArgTest(a, b, c):
    return a, b, c


print("Function called with star arg from tuple:")

star_list_arg = (11, 44, 77)
print(starArgTest(*star_list_arg))

print("Function called with star arg from list:")

star_list_arg = [7, 8, 9]
print(starArgTest(*star_list_arg))

star_dict_arg = {"a": 9, "b": 3, "c": 8}

print("Function called with star arg from dict")

print(starArgTest(**star_dict_arg))

lambda_func = lambda a, b: a < b
lambda_args = (8, 9)

print("Lambda function called with star args from tuple:")
print(lambda_func(*lambda_args))

print("Lambda function called with star args from list:")
lambda_args = [8, 7]
print(lambda_func(*lambda_args))


print("Generator function without context:")


def generator_without_context_function():
    gen = (x for x in range(9))

    return tuple(gen)


print(generator_without_context_function())

print("Generator function with 2 iterateds:")


def generator_with_2_fors():
    return tuple((x, y) for x in range(2) for y in range(3))


print(generator_with_2_fors())


def someYielder():
    yield 1
    yield 2


def someYieldFunctionUser():
    print("someYielder", someYielder())

    result = []

    for a in someYielder():
        result.append(a)

    return result


print("Function that uses some yielding function coroutine:")
print(someYieldFunctionUser())


def someLoopYielder():
    for i in (0, 1, 2):
        yield i


def someLoopYieldFunctionUser():
    result = []

    for a in someLoopYielder():
        result.append(a)

    return result


print("Function that uses some yielding function coroutine that loops:")
print(someLoopYieldFunctionUser())


def someGeneratorClosureUser():
    def someGenerator():
        def userOfGeneratorLocalVar():
            return x + 1

        x = 2

        yield userOfGeneratorLocalVar()
        yield 6

    gen = someGenerator()

    return [next(gen), next(gen)]


print(
    "Function generator that uses a local function accessing its local variables to yield:"
)
print(someGeneratorClosureUser())


def someClosureUsingGeneratorUser():
    offered = 7

    def someGenerator():
        yield offered

    return next(someGenerator())


print("Function generator that yield from its closure:")
print(someClosureUsingGeneratorUser())


print("Function call with both star args and named args:")


def someFunction(a, b, c, d):
    print(a, b, c, d)


someFunction(a=1, b=2, **{"c": 3, "d": 4})

print("Order of evaluation of function and args:")


def getFunction():
    print("getFunction", end="")

    def x(y, u, a, k):
        return y, u, k, a

    return x


def getPlainArg1():
    print("getPlainArg1", end="")
    return 9


def getPlainArg2():
    print("getPlainArg2", end="")
    return 13


def getKeywordArg1():
    print("getKeywordArg1", end="")
    return "a"


def getKeywordArg2():
    print("getKeywordArg2", end="")
    return "b"


getFunction()(getPlainArg1(), getPlainArg2(), k=getKeywordArg1(), a=getKeywordArg2())
print()


def getListStarArg():
    print("getListStarArg", end="")
    return [1]


def getDictStarArg():
    print("getDictStarArg", end="")
    return {"k": 9}


print("Same with star args:")

getFunction()(getPlainArg1(), a=getKeywordArg1(), *getListStarArg(), **getDictStarArg())
print()

print("Dictionary creation order:")

d = {getKeywordArg1(): getPlainArg1(), getKeywordArg2(): getPlainArg2()}
print()

print("Throwing an exception to a generator function:")


def someGeneratorFunction():
    try:
        yield 1
        yield 2
    except Exception:  # pylint: disable=broad-except
        yield 3

    yield 4


gen1 = someGeneratorFunction()

print("Fresh Generator Function throwing gives", end="")

try:
    print(gen1.throw(ValueError)),
except ValueError:
    print("exception indeed")

gen2 = someGeneratorFunction()

print("Used Generator Function throwing gives", end="")
next(gen2)
print(gen2.throw(ValueError), "indeed")

gen3 = someGeneratorFunction()

print("Fresh Generator Function close gives", end="")
print(gen3.close())

gen4 = someGeneratorFunction()

print("Used Generator Function that mis-catches close gives", end="")
next(gen4)
try:
    print(gen4.close(), end="")
except RuntimeError:
    print("runtime exception indeed")


gen5 = someGeneratorFunction()

print("Used Generator Function close gives", end="")
next(gen5)
next(gen5)
next(gen5)

print(gen5.close(), end="")


def receivingGenerator():
    while True:
        a = yield 4
        yield a


print("Generator function that receives", end="")

gen6 = receivingGenerator()

print(next(gen6), end="")
print(gen6.send(5), end="")
print(gen6.send(6), end="")
print(gen6.send(7), end="")
print(gen6.send(8))

print("Generator function whose generator is copied", end="")


def generatorFunction():
    yield 1
    yield 2


gen7 = generatorFunction()
next(gen7)

gen8 = iter(gen7)
print(next(gen8))


def doubleStarArgs(*a, **d):
    return a, d


try:
    from UserDict import UserDict
except ImportError:
    print("Using Python3, making own non-dict dict:")

    class UserDict(dict):
        pass


print("Function that has keyword argument matching the list star arg name", end="")
print(doubleStarArgs(1, **UserDict(a=2)))


def generatorFunctionUnusedArg(_a):
    yield 1


generatorFunctionUnusedArg(3)


def closureHavingGenerator(arg):
    def gen(_x=1):
        yield arg

    return gen()


print("Function generator that has a closure and default argument", end="")
print(list(closureHavingGenerator(3)))


def functionWithDualStarArgsAndKeywordsOnly(a1, a2, a3, a4, b):
    return a1, a2, a3, a4, b


l = [1, 2, 3]
d = {"b": 8}

print(
    "Dual star args, but not positional call",
    functionWithDualStarArgsAndKeywordsOnly(a4=1, *l, **d),
)


def posDoubleStarArgsFunction(a, b, c, *l, **d):
    return a, b, c, l, d


l = [2]
d = {"other": 7, "c": 3}

print("Dual star args consuming function", posDoubleStarArgsFunction(1, *l, **d))


for value in sorted(dir()):
    main_value = getattr(sys.modules["__main__"], value)

    if inspect.isfunction(main_value):
        print(
            main_value,
            main_value.__code__.co_varnames[: main_value.__code__.co_argcount],
            inspect.getargs(main_value.__code__),
        )  #

        # TODO: Make this work as well, currently disabled, because of nested arguments not
        # being compatible yet.
        # print inspect.getargspec( main_value )
