# -*- coding: utf-8 -*-
# SPDX-FileCopyrightText: 2025 KUNBUS GmbH
# SPDX-License-Identifier: GPL-2.0-or-later
"""D-Bus interfaces for IOs."""

from typing import Union

from dbus import SystemBus, SessionBus
from gi.overrides.GLib import Variant
from pydbus.generic import signal
from revpimodio2 import RevPiModIO, Cycletools
from revpimodio2.io import IOBase

from .ios1_helper import get_io_object_path, get_variant_type


class InterfaceInput:
    """
    <node>
        <interface name="com.revolutionpi.ios1.Input">
            <property name="address" type="n" access="read"/>
            <property name="bmk" type="s" access="read"/>
            <property name="bitaddress" type="n" access="readwrite"/>
            <property name="byteorder" type="s" access="readwrite"/>
            <property name="defaultvalue" type="v" access="read"/>
            <property name="length" type="q" access="read"/>
            <property name="name" type="s" access="read"/>
            <property name="signed" type="b" access="readwrite"/>
            <property name="value" type="v" access="read"/>
        </interface>
    </node>
    """

    interface_name = "com.revolutionpi.ios1.Input"
    PropertiesChanged = signal()

    def __init__(self, dbus: Union[SystemBus, SessionBus], io: IOBase):
        self._raw = False
        self.dbus = dbus
        self.io = io
        try:
            self.variant_type = get_variant_type(self.io)
        except ValueError:
            # Fallback to bytes if the integer is too large
            self._raw = True
            self.variant_type = "ay"

    def emit_io_change(self):
        if self.interface_name:
            self.PropertiesChanged(
                self.interface_name,
                {
                    "value": Variant(
                        self.variant_type,
                        self.io.get_value() if self._raw else self.io.value,
                    ),
                },
                [],
            )

    @property
    def address(self) -> int:
        return self.io.address

    @property
    def bmk(self) -> str:
        return self.io.bmk

    @property
    def bitaddress(self) -> int:
        return self.io._bitaddress

    @property
    def byteorder(self) -> str:
        return self.io.byteorder

    @byteorder.setter
    def byteorder(self, value: str) -> None:
        if hasattr(self.io, "_set_byteorder"):
            self.io._set_byteorder(value)
            self.variant_type = get_variant_type(self.io)

    @property
    def defaultvalue(self) -> Variant:
        return Variant(
            self.variant_type,
            self.io.get_value() if self._raw else self.io.defaultvalue,
        )

    @property
    def length(self) -> int:
        # 0 length for boolean
        return 0 if self.variant_type == "b" else self.io.length

    @property
    def name(self) -> str:
        return self.io.name

    @property
    def signed(self) -> bool:
        if hasattr(self.io, "signed"):
            return self.io.signed
        return False

    @signed.setter
    def signed(self, value: bool) -> None:
        if hasattr(self.io, "_set_signed"):
            self.io._set_signed(value)
            self.variant_type = get_variant_type(self.io)

    @property
    def value(self) -> Variant:
        return Variant(
            self.variant_type,
            self.io.get_value() if self._raw else self.io.value,
        )


class InterfaceOutput(InterfaceInput):
    """
    <node>
        <interface name="com.revolutionpi.ios1.Output">
            <property name="address" type="n" access="read"/>
            <property name="bmk" type="s" access="read"/>
            <property name="bitaddress" type="n" access="readwrite"/>
            <property name="byteorder" type="s" access="readwrite"/>
            <property name="defaultvalue" type="v" access="read"/>
            <property name="length" type="q" access="read"/>
            <property name="name" type="s" access="read"/>
            <property name="signed" type="b" access="readwrite"/>
            <property name="value" type="v" access="readwrite"/>
        </interface>
    </node>
    """

    interface_name = "com.revolutionpi.ios1.Output"

    @property
    def value(self) -> Variant:
        return super().value

    @value.setter
    def value(self, value: Variant) -> None:
        if self._raw:
            self.io.set_value(value)
        else:
            self.io.value = value
        self.io._parentdevice._modio.writeprocimg()


class InterfaceIoManager:
    """
    <node>
        <interface name="com.revolutionpi.ios1.IoManager">
            <method name="GetAllInputs">
                <arg name="object-path-list" type="ao" direction="out"/>
            </method>
            <method name="GetAllOutputs">
                <arg name="object-path-list" type="ao" direction="out"/>
            </method>
            <method name="Get">
                <arg name="io_name" type="s" direction="in"/>
                <arg name="object-path" type="o" direction="out"/>
            </method>
            <method name="ActivateIoEvents">
            </method>
            <method name="DeactivateIoEvents">
            </method>
            <signal name="IoChanged">
                <arg name="name" type="s" direction="out"/>
                <arg name="value" type="v" direction="out"/>
            </signal>
        </interface>
    </node>
    """

    interface_name = "com.revolutionpi.ios1.IoManager"
    IoChanged = signal()

    def __init__(self, modio: RevPiModIO, io_interfaces: dict[str, InterfaceInput]):
        self._dc_io_interfaces = io_interfaces
        self.modio = modio

        self.lst_inp = []
        for dev in self.modio.device:
            for io in dev.get_inputs():
                self.lst_inp.append(get_io_object_path(io.name))
        self.lst_out = []
        for dev in self.modio.device:
            for io in dev.get_outputs():
                self.lst_out.append(get_io_object_path(io.name))

    def _modio_cycle(self, ct: Cycletools) -> None:
        for io_name in self._dc_io_interfaces:
            interface = self._dc_io_interfaces[io_name]
            if ct.changed(interface.io):
                interface.emit_io_change()
                self.IoChanged(
                    interface.io.name,
                    Variant(interface.variant_type, interface.io.value),
                )

    def GetAllInputs(self) -> list[str]:
        return self.lst_inp

    def GetAllOutputs(self) -> list[str]:
        return self.lst_out

    def Get(self, io_name) -> str:
        if io_name in self.modio.io:
            return get_io_object_path(io_name)

        raise KeyError(f"No IO with name '{io_name}' found.")

    def ActivateIoEvents(self) -> None:
        if not self.modio._looprunning:
            self.modio.autorefresh_all()
            self.modio.cycleloop(self._modio_cycle, cycletime=50, blocking=False)

    def DeactivateIoEvents(self) -> None:
        self.modio.exit(False)