import asyncio

import pytest

from libp2p.peer.id import ID
from libp2p.tools.factories import FloodsubFactory
from libp2p.tools.pubsub.floodsub_integration_test_settings import (
    floodsub_protocol_pytest_params,
    perform_test_from_obj,
)
from libp2p.tools.utils import connect


@pytest.mark.parametrize("num_hosts", (2,))
@pytest.mark.asyncio
async def test_simple_two_nodes(pubsubs_fsub):
    topic = "my_topic"
    data = b"some data"

    await connect(pubsubs_fsub[0].host, pubsubs_fsub[1].host)
    await asyncio.sleep(0.25)

    sub_b = await pubsubs_fsub[1].subscribe(topic)
    # Sleep to let a know of b's subscription
    await asyncio.sleep(0.25)

    await pubsubs_fsub[0].publish(topic, data)

    res_b = await sub_b.get()

    # Check that the msg received by node_b is the same
    # as the message sent by node_a
    assert ID(res_b.from_id) == pubsubs_fsub[0].host.get_id()
    assert res_b.data == data
    assert res_b.topicIDs == [topic]

    # Success, terminate pending tasks.


# Initialize Pubsub with a cache_size of 4
@pytest.mark.parametrize("num_hosts, pubsub_cache_size", ((2, 4),))
@pytest.mark.asyncio
async def test_lru_cache_two_nodes(pubsubs_fsub, monkeypatch):
    # two nodes with cache_size of 4
    # `node_a` send the following messages to node_b
    message_indices = [1, 1, 2, 1, 3, 1, 4, 1, 5, 1]
    # `node_b` should only receive the following
    expected_received_indices = [1, 2, 3, 4, 5, 1]

    topic = "my_topic"

    # Mock `get_msg_id` to make us easier to manipulate `msg_id` by `data`.
    def get_msg_id(msg):
        # Originally it is `(msg.seqno, msg.from_id)`
        return (msg.data, msg.from_id)

    import libp2p.pubsub.pubsub

    monkeypatch.setattr(libp2p.pubsub.pubsub, "get_msg_id", get_msg_id)

    await connect(pubsubs_fsub[0].host, pubsubs_fsub[1].host)
    await asyncio.sleep(0.25)

    sub_b = await pubsubs_fsub[1].subscribe(topic)
    await asyncio.sleep(0.25)

    def _make_testing_data(i: int) -> bytes:
        num_int_bytes = 4
        if i >= 2 ** (num_int_bytes * 8):
            raise ValueError("integer is too large to be serialized")
        return b"data" + i.to_bytes(num_int_bytes, "big")

    for index in message_indices:
        await pubsubs_fsub[0].publish(topic, _make_testing_data(index))
    await asyncio.sleep(0.25)

    for index in expected_received_indices:
        res_b = await sub_b.get()
        assert res_b.data == _make_testing_data(index)
    assert sub_b.empty()

    # Success, terminate pending tasks.


@pytest.mark.parametrize("test_case_obj", floodsub_protocol_pytest_params)
@pytest.mark.asyncio
@pytest.mark.slow
async def test_gossipsub_run_with_floodsub_tests(test_case_obj):
    await perform_test_from_obj(test_case_obj, FloodsubFactory)