# Copyright 2021-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import random
import os
import socket
import sys

import pytest

from bumble import controller
from bumble import device
from bumble import hci
from bumble import link
from bumble import transport
from bumble.transport.common import PacketParser


# -----------------------------------------------------------------------------
def _make_controller_from_transport(transport: transport.Transport):
    return controller.Controller(
        name="server",
        host_sink=transport.sink,
        host_source=transport.source,
        link=link.LocalLink(),
    )


# -----------------------------------------------------------------------------
def _make_device_from_transport(
    transport: transport.Transport, address: str = "11:22:33:44:55:66"
):
    return device.Device.with_hci(
        name="client",
        address=hci.Address(address),
        hci_sink=transport.sink,
        hci_source=transport.source,
    )


# -----------------------------------------------------------------------------
class Sink:
    def __init__(self):
        self.packets = []

    def on_packet(self, packet):
        self.packets.append(packet)


# -----------------------------------------------------------------------------
def test_parser():
    sink1 = Sink()
    parser1 = PacketParser(sink1)
    sink2 = Sink()
    parser2 = PacketParser(sink2)

    for parser in [parser1, parser2]:
        with open(
            os.path.join(os.path.dirname(__file__), 'hci_data_001.bin'), 'rb'
        ) as input:
            while True:
                n = random.randint(1, 9)
                data = input.read(n)
                if not data:
                    break
                parser.feed_data(data)

    assert sink1.packets == sink2.packets


# -----------------------------------------------------------------------------
def test_parser_extensions():
    sink = Sink()
    parser = PacketParser(sink)

    # Check that an exception is thrown for an unknown type
    try:
        parser.feed_data(bytes([0x77, 0x00, 0x02, 0x01, 0x02]))
        exception_thrown = False
    except ValueError:
        exception_thrown = True

    assert exception_thrown

    # Now add a custom info
    parser.extended_packet_info[0x77] = (1, 1, 'B')
    parser.reset()
    parser.feed_data(bytes([0x77, 0x00, 0x02, 0x01, 0x02]))
    assert len(sink.packets) == 1


# -----------------------------------------------------------------------------
@pytest.mark.parametrize(
    "address,",
    ("127.0.0.1", "::1"),
)
async def test_tcp_connection(address):
    server_transport = await transport.open_transport(f"tcp-server:{address}:0")
    port = server_transport.server.sockets[0].getsockname()[1]
    _make_controller_from_transport(server_transport)

    client_transport = await transport.open_transport(f"tcp-client:{address}:{port}")
    client_device = _make_device_from_transport(client_transport)
    await client_device.power_on()

    await client_transport.close()
    await server_transport.close()


# -----------------------------------------------------------------------------
@pytest.mark.parametrize(
    "address, family",
    (("127.0.0.1", socket.AF_INET), ("::1", socket.AF_INET6)),
)
async def test_udp_connection(address, family):
    # Pick empty ports
    ports = []
    for _ in range(2):
        sock = socket.socket(family=family, type=socket.SOCK_DGRAM)
        sock.bind((address, 0))
        ports.append(sock.getsockname()[1])
        sock.close()

    server_transport = await transport.open_transport(
        f"udp:{address}:{ports[0]},{address}:{ports[1]}"
    )
    _make_controller_from_transport(server_transport)

    client_transport = await transport.open_transport(
        f"udp:{address}:{ports[1]},{address}:{ports[0]}"
    )
    client_device = _make_device_from_transport(client_transport)
    await client_device.power_on()

    await client_transport.close()
    await server_transport.close()


# -----------------------------------------------------------------------------
@pytest.mark.parametrize(
    "server_address, client_address",
    (
        ("127.0.0.1", "ws://127.0.0.1"),
        ("::1", "ws://[::1]"),
    ),
)
async def test_ws_connection(server_address, client_address):
    server_transport = await transport.open_transport(f"ws-server:{server_address}:0")
    port = server_transport.server.sockets[0].getsockname()[1]
    _make_controller_from_transport(server_transport)

    client_transport = await transport.open_transport(
        f"ws-client:{client_address}:{port}"
    )
    client_device = _make_device_from_transport(client_transport)
    await client_device.power_on()

    await client_transport.close()
    await server_transport.close()


# -----------------------------------------------------------------------------
@pytest.mark.skipif(
    sys.platform != 'linux', reason='Unix socket is only fully supported on Linux'
)
async def test_unix_connection_file(tmpdir):
    path = str(tmpdir / 'bumble.sock')
    server_transport = await transport.open_transport(f"unix-server:{path}")
    _make_controller_from_transport(server_transport)

    client_transport = await transport.open_transport(f"unix-client:{path}")
    client_device = _make_device_from_transport(client_transport)
    await client_device.power_on()

    await client_transport.close()
    await server_transport.close()


# -----------------------------------------------------------------------------
@pytest.mark.skipif(
    sys.platform != 'linux', reason='Unix socket is only fully supported on Linux'
)
async def test_unix_connection_abstract():
    server_transport = await transport.open_transport("unix-server:@bumble.test.sock")
    _make_controller_from_transport(server_transport)

    client_transport = await transport.open_transport("unix-client:@bumble.test.sock")
    client_device = _make_device_from_transport(client_transport)
    await client_device.power_on()

    await client_transport.close()
    await server_transport.close()


# -----------------------------------------------------------------------------
if __name__ == '__main__':
    test_parser()
    test_parser_extensions()