import asyncio

import pytest
from dbus_fast import Message, MessageType
from dbus_fast.aio import MessageBus
from dbus_fast.constants import PropertyAccess
from dbus_fast.service import (
    ServiceInterface,
    SignalDisabledError,
    dbus_property,
    signal,
)
from dbus_fast.signature import Variant


class ExampleInterface(ServiceInterface):
    def __init__(self, name):
        super().__init__(name)

    @signal()
    def signal_empty(self):
        assert type(self) is ExampleInterface

    @signal()
    def signal_simple(self) -> "s":
        assert type(self) is ExampleInterface
        return "hello"

    @signal()
    def signal_multiple(self) -> "ss":
        assert type(self) is ExampleInterface
        return ["hello", "world"]

    @signal(name="renamed")
    def original_name(self):
        assert type(self) is ExampleInterface

    @signal(disabled=True)
    def signal_disabled(self):
        assert type(self) is ExampleInterface

    @dbus_property(access=PropertyAccess.READ)
    def test_prop(self) -> "i":
        return 42


class SecondExampleInterface(ServiceInterface):
    def __init__(self, name):
        super().__init__(name)

    @dbus_property(access=PropertyAccess.READ)
    def str_prop(self) -> "s":
        return "abc"

    @dbus_property(access=PropertyAccess.READ)
    def list_prop(self) -> "ai":
        return [1, 2, 3]


class ExpectMessage:
    def __init__(self, bus1, bus2, interface_name, timeout=1):
        self.future = asyncio.get_running_loop().create_future()
        self.bus1 = bus1
        self.bus2 = bus2
        self.interface_name = interface_name
        self.timeout = timeout
        self.timeout_task = None

    def message_handler(self, msg):
        if msg.sender == self.bus1.unique_name and msg.interface == self.interface_name:
            self.timeout_task.cancel()
            self.future.set_result(msg)
            return True

    def timeout_cb(self):
        self.future.set_exception(TimeoutError)

    async def __aenter__(self):
        self.bus2.add_message_handler(self.message_handler)
        self.timeout_task = asyncio.get_running_loop().call_later(
            self.timeout, self.timeout_cb
        )

        return self.future

    async def __aexit__(self, exc_type, exc_val, exc_tb):
        self.bus2.remove_message_handler(self.message_handler)


def assert_signal_ok(signal, export_path, member, signature, body):
    assert signal.message_type == MessageType.SIGNAL
    assert signal.path == export_path
    assert signal.member == member
    assert signal.signature == signature
    assert signal.body == body


@pytest.mark.asyncio
async def test_signals():
    bus1 = await MessageBus().connect()
    bus2 = await MessageBus().connect()

    interface = ExampleInterface("test.interface")
    export_path = "/test/path"
    bus1.export(export_path, interface)

    await bus2.call(
        Message(
            destination="org.freedesktop.DBus",
            path="/org/freedesktop/DBus",
            interface="org.freedesktop.DBus",
            member="AddMatch",
            signature="s",
            body=[f"sender={bus1.unique_name}"],
        )
    )

    async with ExpectMessage(bus1, bus2, interface.name) as expected_signal:
        interface.signal_empty()
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="signal_empty",
            signature="",
            body=[],
        )

    async with ExpectMessage(bus1, bus2, interface.name) as expected_signal:
        interface.original_name()
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="renamed",
            signature="",
            body=[],
        )

    async with ExpectMessage(bus1, bus2, interface.name) as expected_signal:
        interface.signal_simple()
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="signal_simple",
            signature="s",
            body=["hello"],
        )

    async with ExpectMessage(bus1, bus2, interface.name) as expected_signal:
        interface.signal_multiple()
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="signal_multiple",
            signature="ss",
            body=["hello", "world"],
        )

    with pytest.raises(SignalDisabledError):
        interface.signal_disabled()

    bus1.disconnect()
    bus2.disconnect()
    bus1._sock.close()
    bus2._sock.close()


@pytest.mark.asyncio
async def test_interface_add_remove_signal():
    bus1 = await MessageBus().connect()
    bus2 = await MessageBus().connect()

    await bus2.call(
        Message(
            destination="org.freedesktop.DBus",
            path="/org/freedesktop/DBus",
            interface="org.freedesktop.DBus",
            member="AddMatch",
            signature="s",
            body=[f"sender={bus1.unique_name}"],
        )
    )

    first_interface = ExampleInterface("test.interface.first")
    second_interface = SecondExampleInterface("test.interface.second")
    export_path = "/test/path"

    # add first interface
    async with ExpectMessage(
        bus1, bus2, "org.freedesktop.DBus.ObjectManager"
    ) as expected_signal:
        bus1.export(export_path, first_interface)
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="InterfacesAdded",
            signature="oa{sa{sv}}",
            body=[
                export_path,
                {"test.interface.first": {"test_prop": Variant("i", 42)}},
            ],
        )

    # add second interface
    async with ExpectMessage(
        bus1, bus2, "org.freedesktop.DBus.ObjectManager"
    ) as expected_signal:
        bus1.export(export_path, second_interface)
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="InterfacesAdded",
            signature="oa{sa{sv}}",
            body=[
                export_path,
                {
                    "test.interface.second": {
                        "str_prop": Variant("s", "abc"),
                        "list_prop": Variant("ai", [1, 2, 3]),
                    }
                },
            ],
        )

    # remove single interface
    async with ExpectMessage(
        bus1, bus2, "org.freedesktop.DBus.ObjectManager"
    ) as expected_signal:
        bus1.unexport(export_path, second_interface)
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="InterfacesRemoved",
            signature="oas",
            body=[export_path, ["test.interface.second"]],
        )

    # add second interface again
    async with ExpectMessage(
        bus1, bus2, "org.freedesktop.DBus.ObjectManager"
    ) as expected_signal:
        bus1.export(export_path, second_interface)
        await expected_signal

    # remove multiple interfaces
    async with ExpectMessage(
        bus1, bus2, "org.freedesktop.DBus.ObjectManager"
    ) as expected_signal:
        bus1.unexport(export_path)
        assert_signal_ok(
            signal=await expected_signal,
            export_path=export_path,
            member="InterfacesRemoved",
            signature="oas",
            body=[export_path, ["test.interface.first", "test.interface.second"]],
        )

    bus1.disconnect()
    bus2.disconnect()
    bus1._sock.close()
    bus2._sock.close()