import asyncio

import multiaddr
import pytest

from libp2p import new_node
from libp2p.peer.peerinfo import info_from_p2p_addr
from libp2p.protocol_muxer.multiselect_client import MultiselectClientError
from libp2p.security.insecure.transport import InsecureSession, InsecureTransport
from libp2p.security.simple.transport import SimpleSecurityTransport
from tests.utils import cleanup, connect, generate_new_private_key

# TODO: Add tests for multiple streams being opened on different
# protocols through the same connection


def peer_id_for_node(node):
    addr = node.get_addrs()[0]
    info = info_from_p2p_addr(addr)
    return info.peer_id


initiator_private_key = generate_new_private_key()
initiator_private_key_bytes = initiator_private_key.export_key("DER")
initiator_public_key_bytes = initiator_private_key.publickey().export_key("DER")

noninitiator_private_key = generate_new_private_key()
noninitiator_private_key_bytes = noninitiator_private_key.export_key("DER")
noninitiator_public_key_bytes = noninitiator_private_key.publickey().export_key("DER")


async def perform_simple_test(
    assertion_func, transports_for_initiator, transports_for_noninitiator
):

    # Create libp2p nodes and connect them, then secure the connection, then check
    # the proper security was chosen
    # TODO: implement -- note we need to introduce the notion of communicating over a raw connection
    # for testing, we do NOT want to communicate over a stream so we can't just create two nodes
    # and use their conn because our mplex will internally relay messages to a stream
    sec_opt1 = transports_for_initiator
    sec_opt2 = transports_for_noninitiator

    node1 = await new_node(transport_opt=["/ip4/127.0.0.1/tcp/0"], sec_opt=sec_opt1)
    node2 = await new_node(transport_opt=["/ip4/127.0.0.1/tcp/0"], sec_opt=sec_opt2)

    await node1.get_network().listen(multiaddr.Multiaddr("/ip4/127.0.0.1/tcp/0"))
    await node2.get_network().listen(multiaddr.Multiaddr("/ip4/127.0.0.1/tcp/0"))

    await connect(node1, node2)

    # Wait a very short period to allow conns to be stored (since the functions
    # storing the conns are async, they may happen at slightly different times
    # on each node)
    await asyncio.sleep(0.1)

    # Get conns
    node1_conn = node1.get_network().connections[peer_id_for_node(node2)]
    node2_conn = node2.get_network().connections[peer_id_for_node(node1)]

    # Perform assertion
    assertion_func(node1_conn.conn)
    assertion_func(node2_conn.conn)

    # Success, terminate pending tasks.
    await cleanup()


@pytest.mark.asyncio
async def test_single_insecure_security_transport_succeeds():
    transports_for_initiator = {
        "foo": InsecureTransport(
            initiator_private_key_bytes, initiator_public_key_bytes
        )
    }
    transports_for_noninitiator = {
        "foo": InsecureTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes
        )
    }

    def assertion_func(conn):
        assert isinstance(conn, InsecureSession)

    await perform_simple_test(
        assertion_func, transports_for_initiator, transports_for_noninitiator
    )


@pytest.mark.asyncio
async def test_single_simple_test_security_transport_succeeds():
    transports_for_initiator = {
        "tacos": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "tacos"
        )
    }
    transports_for_noninitiator = {
        "tacos": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "tacos"
        )
    }

    def assertion_func(conn):
        assert conn.key_phrase == "tacos"

    await perform_simple_test(
        assertion_func, transports_for_initiator, transports_for_noninitiator
    )


@pytest.mark.asyncio
async def test_two_simple_test_security_transport_for_initiator_succeeds():
    transports_for_initiator = {
        "tacos": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "tacos"
        ),
        "shleep": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "shleep"
        ),
    }
    transports_for_noninitiator = {
        "shleep": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "shleep"
        )
    }

    def assertion_func(conn):
        assert conn.key_phrase == "shleep"

    await perform_simple_test(
        assertion_func, transports_for_initiator, transports_for_noninitiator
    )


@pytest.mark.asyncio
async def test_two_simple_test_security_transport_for_noninitiator_succeeds():
    transports_for_initiator = {
        "tacos": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "tacos"
        )
    }
    transports_for_noninitiator = {
        "shleep": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "shleep"
        ),
        "tacos": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "tacos"
        ),
    }

    def assertion_func(conn):
        assert conn.key_phrase == "tacos"

    await perform_simple_test(
        assertion_func, transports_for_initiator, transports_for_noninitiator
    )


@pytest.mark.asyncio
async def test_two_simple_test_security_transport_for_both_succeeds():
    transports_for_initiator = {
        "a": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "a"
        ),
        "b": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "b"
        ),
    }
    transports_for_noninitiator = {
        "b": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "b"
        ),
        "c": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "c"
        ),
    }

    def assertion_func(conn):
        assert conn.key_phrase == "b"

    await perform_simple_test(
        assertion_func, transports_for_initiator, transports_for_noninitiator
    )


@pytest.mark.asyncio
async def test_multiple_security_none_the_same_fails():
    transports_for_initiator = {
        "a": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "a"
        ),
        "b": SimpleSecurityTransport(
            initiator_private_key_bytes, initiator_public_key_bytes, "b"
        ),
    }
    transports_for_noninitiator = {
        "d": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "d"
        ),
        "c": SimpleSecurityTransport(
            noninitiator_private_key_bytes, noninitiator_public_key_bytes, "c"
        ),
    }

    def assertion_func(_):
        assert False

    with pytest.raises(MultiselectClientError):
        await perform_simple_test(
            assertion_func, transports_for_initiator, transports_for_noninitiator
        )

    await cleanup()


@pytest.mark.asyncio
async def test_default_insecure_security():
    transports_for_initiator = None
    transports_for_noninitiator = None

    conn1 = None
    conn2 = None

    def assertion_func(conn):
        nonlocal conn1
        nonlocal conn2
        if not conn1:
            conn1 = conn
        elif not conn2:
            conn2 = conn
        else:
            assert conn1 == conn2

    await perform_simple_test(
        assertion_func, transports_for_initiator, transports_for_noninitiator
    )