import pytest

from fakeredis._command_args_parsing import extract_args
from fakeredis._helpers import SimpleError


def test_extract_args():
    args = (
        b"nx",
        b"ex",
        b"324",
        b"xx",
    )
    (xx, nx, ex, keepttl), _ = extract_args(args, ("nx", "xx", "+ex", "keepttl"))
    assert xx
    assert nx
    assert ex == 324
    assert not keepttl


def test_extract_args__should_raise_error():
    args = (b"nx", b"ex", b"324", b"xx", b"something")
    with pytest.raises(SimpleError):
        _, _ = extract_args(args, ("nx", "xx", "+ex", "keepttl"))


def test_extract_args__should_return_something():
    args = (b"nx", b"ex", b"324", b"xx", b"something")

    (xx, nx, ex, keepttl), left = extract_args(
        args, ("nx", "xx", "+ex", "keepttl"), error_on_unexpected=False
    )
    assert xx
    assert nx
    assert ex == 324
    assert not keepttl
    assert left == (b"something",)

    args = (
        b"nx",
        b"something",
        b"ex",
        b"324",
        b"xx",
    )

    (xx, nx, ex, keepttl), left = extract_args(
        args,
        ("nx", "xx", "+ex", "keepttl"),
        error_on_unexpected=False,
        left_from_first_unexpected=False,
    )
    assert xx
    assert nx
    assert ex == 324
    assert not keepttl
    assert left == [
        b"something",
    ]


def test_extract_args__multiple_numbers():
    args = (
        b"nx",
        b"limit",
        b"324",
        b"123",
        b"xx",
    )

    (xx, nx, limit, keepttl), _ = extract_args(args, ("nx", "xx", "++limit", "keepttl"))
    assert xx
    assert nx
    assert limit == [324, 123]
    assert not keepttl

    (xx, nx, limit, keepttl), _ = extract_args(
        (
            b"nx",
            b"xx",
        ),
        ("nx", "xx", "++limit", "keepttl"),
    )
    assert xx
    assert nx
    assert not keepttl
    assert limit == [None, None]


def test_extract_args__extract_non_numbers():
    args = (
        b"by",
        b"dd",
        b"nx",
        b"limit",
        b"324",
        b"123",
        b"xx",
    )

    (xx, nx, limit, sortby), _ = extract_args(args, ("nx", "xx", "++limit", "*by"))
    assert xx
    assert nx
    assert limit == [324, 123]
    assert sortby == b"dd"


def test_extract_args__extract_maxlen():
    args = (b"MAXLEN", b"5")
    (nomkstream, limit, maxlen, maxid), left_args = extract_args(
        args, ("nomkstream", "+limit", "~+maxlen", "~maxid"), error_on_unexpected=False
    )
    assert not nomkstream
    assert limit is None
    assert maxlen == 5
    assert maxid is None

    args = (b"MAXLEN", b"~", b"5", b"maxid", b"~", b"1")
    (nomkstream, limit, maxlen, maxid), left_args = extract_args(
        args, ("nomkstream", "+limit", "~+maxlen", "~maxid"), error_on_unexpected=False
    )
    assert not nomkstream
    assert limit is None
    assert maxlen == 5
    assert maxid == b"1"

    args = (
        b"by",
        b"dd",
        b"nx",
        b"maxlen",
        b"~",
        b"10",
        b"limit",
        b"324",
        b"123",
        b"xx",
    )

    (nx, maxlen, xx, limit, sortby), _ = extract_args(
        args, ("nx", "~+maxlen", "xx", "++limit", "*by")
    )
    assert xx
    assert nx
    assert maxlen == 10
    assert limit == [324, 123]
    assert sortby == b"dd"