# Copyright 2016-2020, Pulumi Corporation.
#
# 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.

import unittest

from pulumi._utils import is_empty_function

# Function with return value based on input, called in the non_empty function
# bodies below.
def compute(val: int) -> str:
    return f"{val} + {1} = {val + 1}"

class Foo:
    def empty_a(self) -> str:
        ...

    def empty_b(self) -> str:
        """A docstring."""
        ...

    def empty_c(self, value: str):
        ...

    def non_empty_a(self) -> str:
        return "hello"

    def non_empty_b(self) -> str:
        """A docstring."""
        return "hello"

    def non_empty_c(self) -> str:
        return compute(41)

    def non_empty_d(self) -> str:
        """F's docstring."""
        return compute(41)


empty_lambda_a = lambda: None

empty_lambda_b = lambda: None
empty_lambda_b.__doc__ = """A docstring."""

non_empty_lambda_a = lambda: "hello"

non_empty_lambda_b = lambda: "hello"
non_empty_lambda_b.__doc__ = """A docstring."""

non_empty_lambda_c = lambda: compute(41)

non_empty_lambda_d = lambda: compute(41)
non_empty_lambda_d.__doc__ = """A docstring."""

class IsEmptyFunctionTests(unittest.TestCase):
    def test_is_empty(self):
        f = Foo()

        self.assertTrue(is_empty_function(Foo.empty_a))
        self.assertTrue(is_empty_function(Foo.empty_b))
        self.assertTrue(is_empty_function(Foo.empty_c))
        self.assertTrue(is_empty_function(f.empty_a))
        self.assertTrue(is_empty_function(f.empty_b))
        self.assertTrue(is_empty_function(f.empty_c))

        self.assertFalse(is_empty_function(Foo.non_empty_a))
        self.assertFalse(is_empty_function(Foo.non_empty_b))
        self.assertFalse(is_empty_function(Foo.non_empty_c))
        self.assertFalse(is_empty_function(Foo.non_empty_d))
        self.assertFalse(is_empty_function(f.non_empty_a))
        self.assertFalse(is_empty_function(f.non_empty_b))
        self.assertFalse(is_empty_function(f.non_empty_c))
        self.assertFalse(is_empty_function(f.non_empty_d))

        self.assertTrue(is_empty_function(empty_lambda_a))
        self.assertTrue(is_empty_function(empty_lambda_b))

        self.assertFalse(is_empty_function(non_empty_lambda_a))
        self.assertFalse(is_empty_function(non_empty_lambda_b))
        self.assertFalse(is_empty_function(non_empty_lambda_c))
        self.assertFalse(is_empty_function(non_empty_lambda_d))