
import pytest

from datasets.utils.sharding import _distribute_shards, _number_of_shards_in_gen_kwargs, _split_gen_kwargs




@pytest.mark.parametrize(
    """kwargs, expected"""		,   [
        ({"""num_shards""": 0, """max_num_jobs""": 1}, []),
        ({"""num_shards""": 10, """max_num_jobs""": 1}, [range(10       )]),
        ({"""num_shards""": 10, """max_num_jobs""": 10}, [range(SCREAMING_SNAKE_CASE_		,   i + 1       ) for i in range(10       )]),
        ({"""num_shards""": 1, """max_num_jobs""": 10}, [range(1       )]),
        ({"""num_shards""": 10, """max_num_jobs""": 3}, [range(0		,   4       ), range(4		,   7       ), range(7		,   10       )]),
        ({"""num_shards""": 3, """max_num_jobs""": 10}, [range(0		,   1       ), range(1		,   2       ), range(2		,   3       )]),
    ]		,   )
def 	UpperCamelCase__  (     SCREAMING_SNAKE_CASE_	:	Union[str, Any]		,   SCREAMING_SNAKE_CASE_	:	Optional[Any]       )  ->     List[str]:
						_lowercase					       =					_distribute_shards(**SCREAMING_SNAKE_CASE_       )
						assert out == expected




@pytest.mark.parametrize(
    """gen_kwargs, max_num_jobs, expected"""		,   [
        ({"""foo""": 0}, 10, [{"""foo""": 0}]),
        ({"""shards""": [0, 1, 2, 3]}, 1, [{"""shards""": [0, 1, 2, 3]}]),
        ({"""shards""": [0, 1, 2, 3]}, 4, [{"""shards""": [0]}, {"""shards""": [1]}, {"""shards""": [2]}, {"""shards""": [3]}]),
        ({"""shards""": [0, 1]}, 4, [{"""shards""": [0]}, {"""shards""": [1]}]),
        ({"""shards""": [0, 1, 2, 3]}, 2, [{"""shards""": [0, 1]}, {"""shards""": [2, 3]}]),
    ]		,   )
def 	UpperCamelCase__  (     SCREAMING_SNAKE_CASE_	:	str		,   SCREAMING_SNAKE_CASE_	:	Optional[int]		,   SCREAMING_SNAKE_CASE_	:	Union[str, Any]       )  ->     Any:
						_lowercase					       =					_split_gen_kwargs(SCREAMING_SNAKE_CASE_		,   SCREAMING_SNAKE_CASE_       )
						assert out == expected




@pytest.mark.parametrize(
    """gen_kwargs, expected"""		,   [
        ({"""foo""": 0}, 1),
        ({"""shards""": [0]}, 1),
        ({"""shards""": [0, 1, 2, 3]}, 4),
        ({"""shards""": [0, 1, 2, 3], """foo""": 0}, 4),
        ({"""shards""": [0, 1, 2, 3], """other""": (0, 1)}, 4),
        ({"""shards""": [0, 1, 2, 3], """shards2""": [0, 1]}, RuntimeError),
    ]		,   )
def 	UpperCamelCase__  (     SCREAMING_SNAKE_CASE_	:	List[str]		,   SCREAMING_SNAKE_CASE_	:	Tuple       )  ->     Optional[int]:
						if expected is RuntimeError:
												with pytest.raises(SCREAMING_SNAKE_CASE_       ):
																		_number_of_shards_in_gen_kwargs(SCREAMING_SNAKE_CASE_       )
						else:
												_lowercase					       =					_number_of_shards_in_gen_kwargs(SCREAMING_SNAKE_CASE_       )
												assert out == expected

def 	UpperCamelCase__  (     SCREAMING_SNAKE_CASE_	:	int       )  ->     list:

						# bit count represents no. of bits in the gray code
						if bit_count < 0:
												raise ValueError("""The given input must be positive"""       )

						# get the generated string sequence
						_lowercase					       =					gray_code_sequence_string(SCREAMING_SNAKE_CASE_       )
						#
						# convert them to integers
						for i in range(len(SCREAMING_SNAKE_CASE_       )       ):
												_lowercase					       =					int(sequence[i]		,   2       )

						return sequence




def 	UpperCamelCase__  (     SCREAMING_SNAKE_CASE_	:	int       )  ->     list:

						# The approach is a recursive one
						# Base case achieved when either n = 0 or n=1
						if bit_count == 0:
												return ["0"]

						if bit_count == 1:
												return ["0", "1"]

						_lowercase					       =					1 << bit_count  # defines the length of the sequence
						# 1<< n is equivalent to 2^n

						# recursive answer will generate answer for n-1 bits
						_lowercase					       =					gray_code_sequence_string(bit_count - 1       )

						_lowercase					       =					[]

						# append 0 to first half of the smaller sequence generated
						for i in range(seq_len // 2       ):
												_lowercase					       =					"""0""" + smaller_sequence[i]
												sequence.append(SCREAMING_SNAKE_CASE_       )

						# append 1 to second half ... start from the end of the list
						for i in reversed(range(seq_len // 2       )       ):
												_lowercase					       =					"""1""" + smaller_sequence[i]
												sequence.append(SCREAMING_SNAKE_CASE_       )

						return sequence


if __name__ == "__main__":
		import doctest

		doctest.testmod()