# 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 asyncio
import logging
import os
from types import LambdaType
import pytest

from bumble.core import BT_BR_EDR_TRANSPORT
from bumble.device import Connection, Device
from bumble.host import Host
from bumble.hci import (
    HCI_ACCEPT_CONNECTION_REQUEST_COMMAND, HCI_COMMAND_STATUS_PENDING, HCI_CREATE_CONNECTION_COMMAND, HCI_SUCCESS,
    Address, HCI_Command_Complete_Event, HCI_Command_Status_Event, HCI_Connection_Complete_Event, HCI_Connection_Request_Event, HCI_Packet
)


# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)


# -----------------------------------------------------------------------------
class Sink:
    def __init__(self, flow):
        self.flow = flow
        next(self.flow)

    def on_packet(self, packet):
        self.flow.send(packet)


# -----------------------------------------------------------------------------
@pytest.mark.asyncio
async def test_device_connect_parallel():
    d0 = Device(host=Host(None, None))
    d1 = Device(host=Host(None, None))
    d2 = Device(host=Host(None, None))

    # enable classic
    d0.classic_enabled = True
    d1.classic_enabled = True
    d2.classic_enabled = True

    # set public addresses
    d0.public_address = Address('F0:F1:F2:F3:F4:F5', address_type=Address.PUBLIC_DEVICE_ADDRESS)
    d1.public_address = Address('F5:F4:F3:F2:F1:F0', address_type=Address.PUBLIC_DEVICE_ADDRESS)
    d2.public_address = Address('F5:F4:F3:F3:F4:F5', address_type=Address.PUBLIC_DEVICE_ADDRESS)

    def d0_flow():
        packet = HCI_Packet.from_bytes((yield))
        assert packet.name == 'HCI_CREATE_CONNECTION_COMMAND'
        assert packet.bd_addr == d1.public_address

        d0.host.on_hci_packet(HCI_Command_Status_Event(
            status                  = HCI_COMMAND_STATUS_PENDING,
            num_hci_command_packets = 1,
            command_opcode          = HCI_CREATE_CONNECTION_COMMAND
        ))

        d1.host.on_hci_packet(HCI_Connection_Request_Event(
           bd_addr         = d0.public_address,
           class_of_device = 0,
           link_type       = HCI_Connection_Complete_Event.ACL_LINK_TYPE
        ))

        packet = HCI_Packet.from_bytes((yield))
        assert packet.name == 'HCI_CREATE_CONNECTION_COMMAND'
        assert packet.bd_addr == d2.public_address

        d0.host.on_hci_packet(HCI_Command_Status_Event(
            status                  = HCI_COMMAND_STATUS_PENDING,
            num_hci_command_packets = 1,
            command_opcode          = HCI_CREATE_CONNECTION_COMMAND
        ))

        d2.host.on_hci_packet(HCI_Connection_Request_Event(
           bd_addr         = d0.public_address,
           class_of_device = 0,
           link_type       = HCI_Connection_Complete_Event.ACL_LINK_TYPE
        ))

        assert (yield) == None
        
    def d1_flow():
        packet = HCI_Packet.from_bytes((yield))
        assert packet.name == 'HCI_ACCEPT_CONNECTION_REQUEST_COMMAND'

        d1.host.on_hci_packet(HCI_Command_Complete_Event(
            num_hci_command_packets = 1,
            command_opcode          = HCI_ACCEPT_CONNECTION_REQUEST_COMMAND,
            return_parameters       = b"\x00"
        ))

        d1.host.on_hci_packet(HCI_Connection_Complete_Event(
            status             = HCI_SUCCESS,
            connection_handle  = 0x100,
            bd_addr            = d0.public_address,
            link_type          = HCI_Connection_Complete_Event.ACL_LINK_TYPE,
            encryption_enabled = True,
        ))

        d0.host.on_hci_packet(HCI_Connection_Complete_Event(
            status             = HCI_SUCCESS,
            connection_handle  = 0x100,
            bd_addr            = d1.public_address,
            link_type          = HCI_Connection_Complete_Event.ACL_LINK_TYPE,
            encryption_enabled = True,
        ))

        assert (yield) == None

    def d2_flow():
        packet = HCI_Packet.from_bytes((yield))
        assert packet.name == 'HCI_ACCEPT_CONNECTION_REQUEST_COMMAND'

        d2.host.on_hci_packet(HCI_Command_Complete_Event(
            num_hci_command_packets = 1,
            command_opcode          = HCI_ACCEPT_CONNECTION_REQUEST_COMMAND,
            return_parameters       = b"\x00"
        ))

        d2.host.on_hci_packet(HCI_Connection_Complete_Event(
            status             = HCI_SUCCESS,
            connection_handle  = 0x101,
            bd_addr            = d0.public_address,
            link_type          = HCI_Connection_Complete_Event.ACL_LINK_TYPE,
            encryption_enabled = True,
        ))

        d0.host.on_hci_packet(HCI_Connection_Complete_Event(
            status             = HCI_SUCCESS,
            connection_handle  = 0x101,
            bd_addr            = d2.public_address,
            link_type          = HCI_Connection_Complete_Event.ACL_LINK_TYPE,
            encryption_enabled = True,
        ))

        assert (yield) == None

    d0.host.set_packet_sink(Sink(d0_flow()))
    d1.host.set_packet_sink(Sink(d1_flow()))
    d2.host.set_packet_sink(Sink(d2_flow()))

    [c1, c2] = await asyncio.gather(*[
        asyncio.create_task(d0.connect(d1.public_address, transport=BT_BR_EDR_TRANSPORT)),
        asyncio.create_task(d0.connect(d2.public_address, transport=BT_BR_EDR_TRANSPORT)),
    ])

    assert type(c1) == Connection
    assert type(c2) == Connection

    assert c1.handle == 0x100
    assert c2.handle == 0x101


# -----------------------------------------------------------------------------
async def run_test_device():
    await test_device_connect_parallel()


# -----------------------------------------------------------------------------
if __name__ == '__main__':
    logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
    asyncio.run(run_test_device())