import asyncio
from typing import List

import electrum_ecc as ecc

from electrum import util
from electrum import lntransport
from electrum.lntransport import LNPeerAddr, LNResponderTransport, LNTransport, extract_nodeid, split_host_port, ConnStringFormatError
from electrum.util import OldTaskGroup

from . import ElectrumTestCase
from .test_bitcoin import needs_test_with_all_chacha20_implementations


class TestLNTransport(ElectrumTestCase):

    @needs_test_with_all_chacha20_implementations
    async def test_responder(self):
        # local static
        ls_priv=bytes.fromhex('2121212121212121212121212121212121212121212121212121212121212121')
        # ephemeral
        e_priv=bytes.fromhex('2222222222222222222222222222222222222222222222222222222222222222')

        class Writer:
            def __init__(self):
                self.state = 0
            def write(self, data):
                assert self.state == 0
                self.state += 1
                assert len(data) == 50
        class Reader:
            def __init__(self):
                self.state = 0
            async def read(self, num_bytes):
                assert self.state in (0, 1)
                self.state += 1
                if self.state-1 == 0:
                    assert num_bytes == 50
                    return bytes.fromhex('00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a')
                elif self.state-1 == 1:
                    assert num_bytes == 66
                    return bytes.fromhex('00b9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba')
        transport = LNResponderTransport(ls_priv, Reader(), Writer())
        await transport.handshake(epriv=e_priv)

    @needs_test_with_all_chacha20_implementations
    async def test_loop(self):
        responder_shaked = asyncio.Event()
        server_shaked = asyncio.Event()
        responder_key = ecc.ECPrivkey.generate_random_key()
        initiator_key = ecc.ECPrivkey.generate_random_key()
        messages_sent_by_client = [
            b'hello from client',
            b'long data from client ' + bytes(range(256)) * 100 + b'... client done',
            b'client is running out of things to say',
        ]
        messages_sent_by_server = [
            b'hello from server',
            b'hello2 from server',
            b'long data from server ' + bytes(range(256)) * 100 + b'... server done',
        ]
        async def read_messages(transport, expected_messages):
            ctr = 0
            async for msg in transport.read_messages():
                self.assertEqual(expected_messages[ctr], msg)
                ctr += 1
                if ctr == len(expected_messages):
                    return
        async def write_messages(transport, expected_messages):
            for msg in expected_messages:
                transport.send_bytes(msg)
                await asyncio.sleep(0.01)

        async def cb(reader, writer):
            t = LNResponderTransport(responder_key.get_secret_bytes(), reader, writer)
            transports.append(t)
            self.assertEqual(await t.handshake(), initiator_key.get_public_key_bytes())
            async with OldTaskGroup() as group:
                await group.spawn(read_messages(t, messages_sent_by_client))
                await group.spawn(write_messages(t, messages_sent_by_server))
            responder_shaked.set()
        async def connect(port: int):
            peer_addr = LNPeerAddr('127.0.0.1', port, responder_key.get_public_key_bytes())
            t = LNTransport(initiator_key.get_secret_bytes(), peer_addr, e_proxy=None)
            transports.append(t)
            await t.handshake()
            async with OldTaskGroup() as group:
                await group.spawn(read_messages(t, messages_sent_by_server))
                await group.spawn(write_messages(t, messages_sent_by_client))
            server_shaked.set()

        transports = []  # type: List[lntransport.LNTransportBase]
        async def f():
            server = await asyncio.start_server(cb, '127.0.0.1', port=None)
            server_port = server.sockets[0].getsockname()[1]
            try:
                async with OldTaskGroup() as group:
                    await group.spawn(connect(port=server_port))
                    await group.spawn(responder_shaked.wait())
                    await group.spawn(server_shaked.wait())
            finally:
                for t in transports:
                    t.close()
                server.close()
                await server.wait_closed()

        await f()

    def test_split_host_port(self):
        self.assertEqual(split_host_port("[::1]:8000"), ("::1", "8000"))
        self.assertEqual(split_host_port("[::1]"), ("::1", "9735"))
        self.assertEqual(split_host_port("[2601:602:8800:9a:dc59:a4ff:fede:24a9]:9735"), ("2601:602:8800:9a:dc59:a4ff:fede:24a9", "9735"))
        self.assertEqual(split_host_port("[2601:602:8800::a4ff:fede:24a9]:9735"), ("2601:602:8800::a4ff:fede:24a9", "9735"))
        self.assertEqual(split_host_port("kæn.guru:8000"), ("kæn.guru", "8000"))
        self.assertEqual(split_host_port("kæn.guru"), ("kæn.guru", "9735"))
        self.assertEqual(split_host_port("127.0.0.1:8000"), ("127.0.0.1", "8000"))
        self.assertEqual(split_host_port("127.0.0.1"), ("127.0.0.1", "9735"))
        # accepted by getaddrinfo but not ipaddress.ip_address
        self.assertEqual(split_host_port("127.0.0:8000"), ("127.0.0", "8000"))
        self.assertEqual(split_host_port("127.0.0"), ("127.0.0", "9735"))
        self.assertEqual(split_host_port("electrum.org:8000"), ("electrum.org", "8000"))
        self.assertEqual(split_host_port("electrum.org"), ("electrum.org", "9735"))

        with self.assertRaises(ConnStringFormatError):
            split_host_port("electrum.org:8000:")
        with self.assertRaises(ConnStringFormatError):
            split_host_port("electrum.org:")

    def test_extract_nodeid(self):
        pubkey1 = ecc.GENERATOR.get_public_key_bytes(compressed=True)
        with self.assertRaises(ConnStringFormatError):
            extract_nodeid("00" * 32 + "@localhost")
        with self.assertRaises(ConnStringFormatError):
            extract_nodeid("00" * 33 + "@")
        # pubkey + host
        self.assertEqual(extract_nodeid("00" * 33 + "@localhost"), (b"\x00" * 33, "localhost"))
        self.assertEqual(extract_nodeid(f"{pubkey1.hex()}@11.22.33.44"), (pubkey1, "11.22.33.44"))
        self.assertEqual(extract_nodeid(f"{pubkey1.hex()}@[2001:41d0:e:734::1]"), (pubkey1, "[2001:41d0:e:734::1]"))
        # pubkey + host + port
        self.assertEqual(extract_nodeid(f"{pubkey1.hex()}@11.22.33.44:5555"), (pubkey1, "11.22.33.44:5555"))
        self.assertEqual(extract_nodeid(f"{pubkey1.hex()}@[2001:41d0:e:734::1]:8888"), (pubkey1, "[2001:41d0:e:734::1]:8888"))
        # just pubkey
        self.assertEqual(extract_nodeid(f"{pubkey1.hex()}"), (pubkey1, None))
