# 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 bumble.logging
from bumble.colors import color
from bumble.controller import Controller
from bumble.core import ProtocolError
from bumble.device import Device, Peer
from bumble.gatt import (
    GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
    GATT_DEVICE_INFORMATION_SERVICE,
    GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
    Characteristic,
    Descriptor,
    Service,
)
from bumble.gatt_client import show_services
from bumble.hci import Address
from bumble.host import Host
from bumble.link import LocalLink


# -----------------------------------------------------------------------------
class ServerListener(Device.Listener):
    def on_connection(self, connection):
        print(f'### Server:  connected to {connection}')


# -----------------------------------------------------------------------------
async def main() -> None:
    # Create a local link
    link = LocalLink()

    # Setup a stack for the client
    client_controller = Controller("client controller", link=link)
    client_host = Host()
    client_host.controller = client_controller
    client_device = Device(
        "client", address=Address('F0:F1:F2:F3:F4:F5'), host=client_host
    )
    await client_device.power_on()

    # Setup a stack for the server
    server_controller = Controller("server controller", link=link)
    server_host = Host()
    server_host.controller = server_controller
    server_device = Device(
        "server", address=Address('F6:F7:F8:F9:FA:FB'), host=server_host
    )
    server_device.listener = ServerListener()
    await server_device.power_on()

    # Add a few entries to the device's GATT server
    descriptor = Descriptor(
        GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
        Descriptor.READABLE,
        b'My Description',
    )
    manufacturer_name_characteristic = Characteristic[bytes](
        GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
        Characteristic.Properties.READ,
        Characteristic.READABLE,
        b"Fitbit",
        [descriptor],
    )
    device_info_service = Service(
        GATT_DEVICE_INFORMATION_SERVICE, [manufacturer_name_characteristic]
    )
    server_device.add_service(device_info_service)
    await server_device.start_advertising()

    # Connect the client to the server
    connection = await client_device.connect(server_device.random_address)
    print(f'=== Client: connected to {connection}')

    # Discover all services
    print('=== Discovering services')
    peer = Peer(connection)
    await peer.discover_services()
    for service in peer.services:
        await service.discover_characteristics()
        for characteristic in service.characteristics:
            await characteristic.discover_descriptors()

    print('=== Services discovered')
    show_services(peer.services)

    # Discover all attributes
    print('=== Discovering attributes')
    attributes = await peer.discover_attributes()
    for attribute in attributes:
        print(attribute)
    print('=== Attributes discovered')

    # Read all attributes
    for attribute in attributes:
        try:
            value = await attribute.read_value()
            print(color(f'0x{attribute.handle:04X} = {value.hex()}', 'green'))
        except ProtocolError as error:
            print(color(f'cannot read {attribute.handle:04X}:', 'red'), error)

    await asyncio.get_running_loop().create_future()


# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())