import sys
import pytest
from unittest import mock
from pargv import parse_args


def test_no_argv():
    with mock.patch('sys.argv', []):
        assert parse_args() == ([], {})

def test_use_sys_argv_by_default():
    with mock.patch('sys.argv', ['argument', '--flag']):
        assert parse_args() == (['argument'], {'flag': True})

def test_single_positional_argument():
    assert parse_args(['app']) == (['app'], {})

def test_single_positional_argument_with_underscore():
    assert parse_args(['the-app']) == (['the_app'], {})
    assert parse_args(['a-b']) == (['a_b'], {})

def test_optional_argument_with_underscore():
    assert parse_args(['--a-b']) == ([], {'a_b': True})

def test_positional_arguments():
    assert parse_args(['app', 'command']) == (['app', 'command'], {})

def test_one_positional_and_optional_argument():
    assert parse_args(['app', '--help']) == (['app'], {'help': True})

def test_one_positional_and_optional_argument_with_values():
    assert parse_args(['app', '--amount=2', '3']) == (['app'], {'amount': ['2', '3']})

def test_positional_and_optional_arguments():
    assert parse_args(['argument', '--help']) == (['argument'], {'help': True})

def test_short_arg_with_single_option():
    assert parse_args(['-a', 'b', '--abc', 'd']) == ([], {'a': 'b', 'abc': 'd'})

def test_short_arg_with_multiple_options():
    assert parse_args(['-i', 'a', 'b']) == ([], {'i': ['a', 'b']})

def test_short_args_with_equals():
    assert parse_args(['-ab=c']) == ([], {'a': True, 'b': 'c'})
    assert parse_args(['-ab=c', 'd']) == ([], {'a': True, 'b': ['c', 'd']})

def test_long_args_with_equals():
    assert parse_args(['--input-file=a.py']) == ([], {'input_file': 'a.py'})

def test_unintended_hyphen():
    assert parse_args(['---triple-hyphen-']) == ([], {'_triple_hyphen_': True})

@pytest.mark.parametrize('argv, args, kwargs', ((
    ['/pargv/pargv.py', 'command', 'positional', '--flag', '--optional=value', 'test', '--output-file', 'filename', '-flg=name', 'name2'],
    ['/pargv/pargv.py', 'command', 'positional'],
    {
        'flag': True,
        'optional': ['value', 'test'],
        'output_file': 'filename',
        'f': True,
        'l': True,
        'g': ['name', 'name2'],
    }
),))
def test_all_parameters_at_once(argv, args, kwargs):
    assert parse_args(argv) == (args, kwargs)