# ========================================================================== #
#                                                                            #
#    KVMD - The main PiKVM daemon.                                           #
#                                                                            #
#    Copyright (C) 2018-2022  Maxim Devaev <mdevaev@gmail.com>               #
#                                                                            #
#    This program is free software: you can redistribute it and/or modify    #
#    it under the terms of the GNU General Public License as published by    #
#    the Free Software Foundation, either version 3 of the License, or       #
#    (at your option) any later version.                                     #
#                                                                            #
#    This program is distributed in the hope that it will be useful,         #
#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
#    GNU General Public License for more details.                            #
#                                                                            #
#    You should have received a copy of the GNU General Public License       #
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
#                                                                            #
# ========================================================================== #


from typing import Tuple
from typing import Dict
from typing import Iterable
from typing import AsyncGenerator
from typing import Optional
from typing import Any

from ....logging import get_logger

from .... import aiomulti
from .... import usb

from ....yamlconf import Option

from ....validators.basic import valid_bool
from ....validators.basic import valid_int_f1
from ....validators.basic import valid_float_f01
from ....validators.os import valid_abs_path

from .. import BaseHid

from .keyboard import KeyboardProcess
from .mouse import MouseProcess


# =====
class Plugin(BaseHid):  # pylint: disable=too-many-instance-attributes
    def __init__(  # pylint: disable=super-init-not-called
        self,
        keyboard: Dict[str, Any],
        mouse: Dict[str, Any],
        mouse_alt: Dict[str, Any],
        noop: bool,
        udc: str,  # XXX: Not from options, see /kvmd/apps/kvmd/__init__.py for details
    ) -> None:

        self.__udc = udc

        self.__notifier = aiomulti.AioProcessNotifier()

        win98_fix = mouse.pop("absolute_win98_fix")
        common = {"notifier": self.__notifier, "noop": noop}

        self.__keyboard_proc = KeyboardProcess(**common, **keyboard)
        self.__mouse_current = self.__mouse_proc = MouseProcess(**common, **mouse)

        self.__mouse_alt_proc: Optional[MouseProcess] = None
        self.__mouses: Dict[str, MouseProcess] = {}
        if mouse_alt["device_path"]:
            self.__mouse_alt_proc = MouseProcess(
                absolute=(not mouse["absolute"]),
                **common,
                **mouse_alt,
            )
            self.__mouses = {
                "usb": (self.__mouse_proc if mouse["absolute"] else self.__mouse_alt_proc),
                "usb_rel": (self.__mouse_alt_proc if mouse["absolute"] else self.__mouse_proc),
            }
            if win98_fix:
                # На самом деле мультимышка и win95 не зависят друг от друга,
                # но так было проще реализовать переключение режимов
                self.__mouses["usb_win98"] = self.__mouses["usb"]

    @classmethod
    def get_plugin_options(cls) -> Dict:
        return {
            "keyboard": {
                "device":         Option("/dev/kvmd-hid-keyboard", type=valid_abs_path, unpack_as="device_path"),
                "select_timeout": Option(0.1, type=valid_float_f01),
                "queue_timeout":  Option(0.1, type=valid_float_f01),
                "write_retries":  Option(150, type=valid_int_f1),
            },
            "mouse": {
                "device":             Option("/dev/kvmd-hid-mouse", type=valid_abs_path, unpack_as="device_path"),
                "select_timeout":     Option(0.1,   type=valid_float_f01),
                "queue_timeout":      Option(0.1,   type=valid_float_f01),
                "write_retries":      Option(150,   type=valid_int_f1),
                "absolute":           Option(True,  type=valid_bool),
                "absolute_win98_fix": Option(False, type=valid_bool),
                "horizontal_wheel":   Option(True,  type=valid_bool),
            },
            "mouse_alt": {
                "device":           Option("",   type=valid_abs_path, if_empty="", unpack_as="device_path"),
                "select_timeout":   Option(0.1,  type=valid_float_f01),
                "queue_timeout":    Option(0.1,  type=valid_float_f01),
                "write_retries":    Option(150,  type=valid_int_f1),
                # No absolute option here, initialized by (not mouse.absolute)
                # Also no absolute_win98_fix
                "horizontal_wheel": Option(True, type=valid_bool),
            },
            "noop": Option(False, type=valid_bool),
        }

    def sysprep(self) -> None:
        udc = usb.find_udc(self.__udc)
        get_logger(0).info("Using UDC %s", udc)
        self.__keyboard_proc.start(udc)
        self.__mouse_proc.start(udc)
        if self.__mouse_alt_proc:
            self.__mouse_alt_proc.start(udc)

    async def get_state(self) -> Dict:
        keyboard_state = await self.__keyboard_proc.get_state()
        mouse_state = await self.__mouse_current.get_state()
        return {
            "online": True,
            "busy": False,
            "connected": None,
            "keyboard": {
                "online": keyboard_state["online"],
                "leds": {
                    "caps": keyboard_state["caps"],
                    "scroll": keyboard_state["scroll"],
                    "num": keyboard_state["num"],
                },
                "outputs": {"available": [], "active": ""},
            },
            "mouse": {
                "outputs": {
                    "available": list(self.__mouses),
                    "active": self.__get_current_mouse_mode(),
                },
                **mouse_state,
            },
        }

    async def poll_state(self) -> AsyncGenerator[Dict, None]:
        prev_state: Dict = {}
        while True:
            state = await self.get_state()
            if state != prev_state:
                yield state
                prev_state = state
            await self.__notifier.wait()

    async def reset(self) -> None:
        self.__keyboard_proc.send_reset_event()
        self.__mouse_proc.send_reset_event()
        if self.__mouse_alt_proc:
            self.__mouse_alt_proc.send_reset_event()

    async def cleanup(self) -> None:
        try:
            self.__keyboard_proc.cleanup()
        finally:
            try:
                self.__mouse_proc.cleanup()
            finally:
                if self.__mouse_alt_proc:
                    self.__mouse_alt_proc.cleanup()

    # =====

    def send_key_events(self, keys: Iterable[Tuple[str, bool]]) -> None:
        self.__keyboard_proc.send_key_events(keys)

    def send_mouse_button_event(self, button: str, state: bool) -> None:
        self.__mouse_current.send_button_event(button, state)

    def send_mouse_move_event(self, to_x: int, to_y: int) -> None:
        self.__mouse_current.send_move_event(to_x, to_y)

    def send_mouse_relative_event(self, delta_x: int, delta_y: int) -> None:
        self.__mouse_current.send_relative_event(delta_x, delta_y)

    def send_mouse_wheel_event(self, delta_x: int, delta_y: int) -> None:
        self.__mouse_current.send_wheel_event(delta_x, delta_y)

    def set_params(self, keyboard_output: Optional[str]=None, mouse_output: Optional[str]=None) -> None:
        _ = keyboard_output
        if mouse_output in self.__mouses and mouse_output != self.__get_current_mouse_mode():
            self.__mouse_current.send_clear_event()
            self.__mouse_current = self.__mouses[mouse_output]
            self.__mouse_current.set_win98_fix(mouse_output == "usb_win98")
            self.__notifier.notify()

    def clear_events(self) -> None:
        self.__keyboard_proc.send_clear_event()
        self.__mouse_proc.send_clear_event()
        if self.__mouse_alt_proc:
            self.__mouse_alt_proc.send_clear_event()

    # =====

    def __get_current_mouse_mode(self) -> str:
        if len(self.__mouses) == 0:
            return ""
        if self.__mouse_current.is_absolute():
            return ("usb_win98" if self.__mouse_current.get_win98_fix() else "usb")
        return "usb_rel"
