import trio
import secrets

import pytest

from libp2p.host.ping import ID, PING_LENGTH
from libp2p.tools.factories import host_pair_factory


@pytest.mark.trio
async def test_ping_once(is_host_secure):
    async with host_pair_factory(is_host_secure) as (host_a, host_b):
        stream = await host_b.new_stream(host_a.get_id(), (ID,))
        some_ping = secrets.token_bytes(PING_LENGTH)
        await stream.write(some_ping)
        await trio.sleep(0.01)
        some_pong = await stream.read(PING_LENGTH)
        assert some_ping == some_pong
        await stream.close()


SOME_PING_COUNT = 3


@pytest.mark.trio
async def test_ping_several(is_host_secure):
    async with host_pair_factory(is_host_secure) as (host_a, host_b):
        stream = await host_b.new_stream(host_a.get_id(), (ID,))
        for _ in range(SOME_PING_COUNT):
            some_ping = secrets.token_bytes(PING_LENGTH)
            await stream.write(some_ping)
            some_pong = await stream.read(PING_LENGTH)
            assert some_ping == some_pong
            # NOTE: simulate some time to sleep to mirror a real
            # world usage where a peer sends pings on some periodic interval
            # NOTE: this interval can be `0` for this test.
            await trio.sleep(0)
        await stream.close()