v/vlib/flag/flag_test.v

import flag

fn test_if_flag_not_given_return_default_values() {
	mut fp := flag.new_flag_parser([])

	assert false == fp.bool('a_bool', false, '')
	&& 42 == fp.int('an_int', 42, '')
	&& 1.0 == fp.float('a_float', 1.0, '')
	&& 'stuff' == fp.string('a_string', 'stuff', '')
}


fn test_could_define_application_name_and_version() {
	mut fp := flag.new_flag_parser([])
	fp.application('test app')
	fp.version('0.0.42')
	fp.description('some text')

	assert fp.application_name == 'test app'
	&& fp.application_version == '0.0.42'
	&& fp.application_description == 'some text'
}

fn test_bool_flags_do_not_need_an_value() {
	mut fp := flag.new_flag_parser(['--a_bool'])

	assert true == fp.bool('a_bool', false, '')
}

fn test_flags_could_be_defined_with_eq() {
	mut fp := flag.new_flag_parser([
	'--an_int=42',
	'--a_float=2.0',
	'--bool_without',
	'--a_string=stuff',
	'--a_bool=true'])

	assert 42 == fp.int('an_int', 666, '')
	&& true == fp.bool('a_bool', false, '')
	&& true == fp.bool('bool_without', false, '')
	&& 2.0 == fp.float('a_float', 1.0, '')
	&& 'stuff' == fp.string('a_string', 'not_stuff', '')
}

fn test_values_could_be_defined_without_eq() {
	mut fp := flag.new_flag_parser([
	'--an_int', '42',
	'--a_float', '2.0',
	'--bool_without',
	'--a_string', 'stuff',
	'--a_bool', 'true'])

	assert 42 == fp.int('an_int', 666, '')
	&& true == fp.bool('a_bool', false, '')
	&& true == fp.bool('bool_without', false, '')
	&& 2.0 == fp.float('a_float', 1.0, '')
	&& 'stuff' == fp.string('a_string', 'not_stuff', '')
}

fn test_values_could_be_defined_mixed() {
	mut fp := flag.new_flag_parser([
	'--an_int', '42',
	'--a_float=2.0',
	'--bool_without',
	'--a_string', 'stuff',
	'--a_bool=true'])

	assert 42 == fp.int('an_int', 666, '')
	&& true == fp.bool('a_bool', false, '')
	&& true == fp.bool('bool_without', false, '')
	&& 2.0 == fp.float('a_float', 1.0, '')
	&& 'stuff' == fp.string('a_string', 'not_stuff', '')
}

fn test_beaware_for_argument_names_with_same_prefix() {
	mut fp := flag.new_flag_parser([
	'--short', '5',
	'--shorter=7'
	])

	assert 5 == fp.int('short', 666, '')
	&& 7 == fp.int('shorter', 666, '')
}

fn test_beaware_for_argument_names_with_same_prefix_inverse() {
	mut fp := flag.new_flag_parser([
	'--shorter=7',
	'--short', '5',
	])

	assert 5 == fp.int('short', 666, '')
	&& 7 == fp.int('shorter', 666, '')
}

fn test_allow_to_skip_executable_path() {
	mut fp := flag.new_flag_parser(['./path/to/execuable'])

	fp.skip_executable()

	args := fp.finalize() or {
		assert false
		return
	}
	assert !args.contains('./path/to/execuable')
}

fn test_none_flag_arguments_are_allowed() {
	mut fp := flag.new_flag_parser([
	'file1', '--an_int=2', 'file2', 'file3', '--bool_without', 'file4', '--outfile', 'outfile'])

	assert 2 == fp.int('an_int', 666, '')
	&& 'outfile' == fp.string('outfile', 'bad', '')
	&& true == fp.bool('bool_without', false, '')
}

fn test_finalize_returns_none_flag_arguments_ordered() {
	mut fp := flag.new_flag_parser(['d', 'b', 'x', 'a', '--outfile', 'outfile'])
	fp.string('outfile', 'bad', '')

	finalized := fp.finalize() or {
		assert false
		return
	}

	expected := ['d', 'b', 'x', 'a']
	mut all_as_expected := true
	for i, v in finalized {
		all_as_expected = all_as_expected && v == expected[i]
	}
	assert all_as_expected
}

fn test_finalize_returns_error_for_unknown_flags() {
	mut fp := flag.new_flag_parser(['--known', '--unknown'])

	fp.bool('known', false, '')

	finalized := fp.finalize() or {
		assert err == 'Unknown argument \'unknown\''
		return
	}
	assert finalized.len < 0 // expect error to be returned
}

fn test_allow_to_build_usage_message() {
	mut fp := flag.new_flag_parser([])
	fp.limit_free_args(1, 4)
	fp.application('flag_tool')
	fp.version('v0.0.0')
	fp.description('some short information about this tool')

	fp.int('an_int', 666, 'some int to define')
	fp.bool('a_bool', false, 'some bool to define')
	fp.bool('bool_without_but_really_big', false, 'this should appear on the next line')
	fp.float('a_float', 1.0, 'some float as well')
	fp.string('a_string', 'not_stuff', 'your credit card number')

	usage := fp.usage()
	mut all_strings_found := true
	for s in ['flag_tool', 'v0.0.0',
	'an_int <int>', 'a_bool', 'bool_without', 'a_float <float>', 'a_string <string>',
	'some int to define',
	'some bool to define',
	'this should appear on the next line',
	'some float as well',
	'your credit card number',
	'The arguments should be at least 1 and at most 4 in number.',
	'Usage', 'Options:', 'Description:',
	'some short information about this tool'] {
		if !usage.contains(s) {
			eprintln(' missing \'$s\' in usage message')
			all_strings_found = false
		}
	}
	assert all_strings_found
}

fn test_if_no_description_given_usage_message_does_not_contain_descpription() {
	mut fp := flag.new_flag_parser([])
	fp.application('flag_tool')
	fp.version('v0.0.0')

	fp.bool('a_bool', false, '')

	assert !fp.usage().contains('Description:')
}

fn test_if_no_options_given_usage_message_does_not_contain_options() {
	mut fp := flag.new_flag_parser([])
	fp.application('flag_tool')
	fp.version('v0.0.0')

	assert !fp.usage().contains('Options:')
}

fn test_free_args_could_be_limited() {
	mut fp1 := flag.new_flag_parser(['a', 'b', 'c'])
	fp1.limit_free_args(1, 4)
	args := fp1.finalize() or {
		assert false
		return
	}
	assert args[0] == 'a' && args[1] == 'b' && args[2] == 'c'
}

fn test_error_for_to_few_free_args() {
	mut fp1 := flag.new_flag_parser(['a', 'b', 'c'])
	fp1.limit_free_args(5, 6)
	args := fp1.finalize() or {
		assert err.starts_with('Expected at least 5 arguments')
		return
	}
	assert args.len < 0 // expect an error and need to use args
}

fn test_error_for_to_much_free_args() {
	mut fp1 := flag.new_flag_parser(['a', 'b', 'c'])
	fp1.limit_free_args(1, 2)
	args := fp1.finalize() or {
		assert err.starts_with('Expected at most 2 arguments')
		return
	}
	assert args.len < 0 // expect an error and need to use args
}

fn test_could_expect_no_free_args() {
	mut fp1 := flag.new_flag_parser(['a'])
	fp1.limit_free_args(0, 0)
	args := fp1.finalize() or {
		assert err.starts_with('Expected no arguments')
		return
	}
	assert args.len < 0 // expect an error and need to use args
}

fn test_allow_abreviations() {
	mut fp := flag.new_flag_parser(['-v', '-o', 'some_file', '-i', '42', '-f', '2.0'])

	v := fp.bool_('version', `v`, false, '')
	o := fp.string_('output', `o`, 'empty', '')
	i := fp.int_('count', `i`, 0, '')
	f := fp.float_('value', `f`, 0.0, '')

	assert v && o == 'some_file' && i == 42 && f == 2.0

	u := fp.usage()
	assert u.contains(' -v') && u.contains(' -o') && u.contains(' -i') && u.contains(' -f')
	assert u.contains('  -o, --output <string>')
	assert u.contains('  -i, --count <int>')
	assert u.contains('  -f, --value <float>')
}

fn test_allow_kebab_options() {
	default_value := 'this_is_the_default_value_of_long_option'
	long_option_value := 'this_is_a_long_option_value_as_argument'

	mut fp := flag.new_flag_parser(['--my-long-flag', 'true', '--my-long-option', long_option_value ])

	my_flag   := fp.bool('my-long-flag',     false,         'flag with long-kebab-name')
	my_option := fp.string('my-long-option', default_value, 'string with long-kebab-name')

	assert my_flag == true
	assert my_option == long_option_value

	u := fp.usage()
	assert u.contains(' --my-long-flag')
	assert u.contains(' --my-long-option')
}

fn test_not_provided_option_is_not_returned() {
	mut fp := flag.new_flag_parser([])
	fp.bool_opt('some-flag', `a`, '') or {
		fp.int_opt('some-flag', `a`, '') or {
			fp.float_opt('some-flag', `a`, '') or {
				fp.string_opt('some-flag', `a`, '') or {
					//Everything should not return
					return
				}
			}
		}
	}
	//If we reach here, one of them returned a value.
	assert false
}

fn test_provided_option_is_returned() {
	mut fp := flag.new_flag_parser(['-a', '-b', '3', '-c', 'hello', '-d', '3.14'])
	a := fp.bool_opt('some-flag', `a`, '') or {
		panic('bool_opt did not return a bool')
	}
	b := fp.int_opt('some-flag', `b`, '') or {
		panic('int_opt did not return an int')
	}
	c := fp.string_opt('some-flag', `c`, '') or {
		panic('string_opt did not return a string')
	}
	d := fp.float_opt('some-flag', `d`, '') or {
		panic('float_opt did not return a float')
	}
	assert a && b == 3 && c == 'hello' && d == 3.14
}

fn test_multiple_arguments() {
	mut fp := flag.new_flag_parser([
		'-a', '2', '-a', '3', '-a', '5',
		'-b', 'a', '-b', 'c', '-b', 'b',
		'-c', '1.23', '-c', '2.34', '-c', '3.45'
	])

	//TODO Move to array comparison once it's implemented
	//assert fp.int_multi('some-flag', `a`, '') == [2, 3, 5] &&
	//	fp.string_multi('some-flag', `b`, '') == ['a', 'c', 'b'] &&
	//	fp.float_multi('some-flag', `c`, '') == [1.23, 2.34, 3.45]

	a := fp.int_multi('some-flag', `a`, '')
	b := fp.string_multi('some-flag', `b`, '')
	c := fp.float_multi('some-flag', `c`, '')
	assert a.len == 3 && b.len == 3 && c.len == 3
	assert a[0] == 2 && a[1] == 3 && a[2] == 5
	assert b[0] == 'a' && b[1] == 'c' && b[2] == 'b'
	assert c[0] == 1.23 && c[1] == 2.34 && c[2] == 3.45
}