# -*- coding: utf-8 -*-
# input-remapper - GUI for device specific keyboard mappings
# Copyright (C) 2025 sezanzeb <b8x45ygc9@mozmail.com>
#
# This file is part of input-remapper.
#
# input-remapper 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.
#
# input-remapper 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 input-remapper.  If not, see <https://www.gnu.org/licenses/>.

"""Control the dbus service from the command line."""

import argparse
import logging
import os
import subprocess
import sys
from enum import Enum
from typing import Optional

import gi

gi.require_version("GLib", "2.0")
from gi.repository import GLib

from inputremapper.configs.global_config import GlobalConfig
from inputremapper.configs.migrations import Migrations
from inputremapper.injection.global_uinputs import GlobalUInputs, FrontendUInput
from inputremapper.logging.logger import logger
from inputremapper.user import UserUtils


class Commands(Enum):
    AUTOLOAD = "autoload"
    START = "start"
    STOP = "stop"
    STOP_ALL = "stop-all"
    HELLO = "hello"
    QUIT = "quit"


class Internals(Enum):
    # internal stuff that the gui uses
    START_DAEMON = "start-daemon"
    START_READER_SERVICE = "start-reader-service"


class Options:
    command: str
    config_dir: str
    preset: str
    device: str
    list_devices: bool
    key_names: str
    debug: bool
    version: str


class InputRemapperControlBin:
    def __init__(
        self,
        global_config: GlobalConfig,
        migrations: Migrations,
    ):
        self.global_config = global_config
        self.migrations = migrations

    @staticmethod
    def main(options: Options) -> None:
        global_config = GlobalConfig()
        global_uinputs = GlobalUInputs(FrontendUInput)
        migrations = Migrations(global_uinputs)
        input_remapper_control = InputRemapperControlBin(
            global_config,
            migrations,
        )

        if options.debug:
            logger.update_verbosity(True)

        if options.version:
            logger.log_info()
            return

        logger.debug('Call for "%s"', sys.argv)

        boot_finished_ = input_remapper_control.boot_finished()
        is_root = UserUtils.user == "root"
        is_autoload = options.command == Commands.AUTOLOAD
        config_dir_set = options.config_dir is not None
        if is_autoload and not boot_finished_ and is_root and not config_dir_set:
            # this is probably happening during boot time and got
            # triggered by udev. There is no need to try to inject anything if the
            # service doesn't know where to look for a config file. This avoids a lot
            # of confusing service logs. And also avoids potential for problems when
            # input-remapper-control stresses about evdev, dbus and multiprocessing already
            # while the system hasn't even booted completely.
            logger.warning("Skipping autoload command without a logged in user")
            return

        if options.command is not None:
            if options.command in [command.value for command in Internals]:
                input_remapper_control.internals(options.command, options.debug)
            elif options.command in [command.value for command in Commands]:
                from inputremapper.daemon import Daemon

                daemon = Daemon.connect(fallback=False)

                input_remapper_control.set_daemon(daemon)

                input_remapper_control.communicate(
                    options.command,
                    options.device,
                    options.config_dir,
                    options.preset,
                )
            else:
                logger.error('Unknown command "%s"', options.command)
        else:
            if options.list_devices:
                input_remapper_control.list_devices()

            if options.key_names:
                input_remapper_control.list_key_names()

        if options.command:
            logger.info("Done")

    def list_devices(self):
        logger.setLevel(logging.ERROR)
        from inputremapper.groups import groups

        for group in groups.get_groups():
            print(group.key)

    def list_key_names(self):
        from inputremapper.configs.keyboard_layout import keyboard_layout

        print("\n".join(keyboard_layout.list_names()))

    def communicate(
        self,
        command: str,
        device: str,
        config_dir: Optional[str],
        preset: str,
    ) -> None:
        """Commands that require a running daemon."""
        if self.daemon is None:
            # probably broken tests
            logger.error("Daemon missing")
            sys.exit(5)

        if config_dir is not None:
            self._load_config(config_dir)

        self.ensure_migrated()

        if command == Commands.AUTOLOAD.value:
            self._autoload(device)

        if command == Commands.START.value:
            self._start(device, preset)

        if command == Commands.STOP.value:
            self._stop(device)

        if command == Commands.STOP_ALL.value:
            self.daemon.stop_all()

        if command == Commands.HELLO.value:
            self._hello()

        if command == Commands.QUIT.value:
            self._quit()

    def _hello(self):
        response = self.daemon.hello("hello")
        logger.info('Daemon answered with "%s"', response)

    def _load_config(self, config_dir: str) -> None:
        path = os.path.abspath(
            os.path.expanduser(os.path.join(config_dir, "config.json"))
        )
        if not os.path.exists(path):
            logger.error('"%s" does not exist', path)
            sys.exit(6)

        logger.info('Using config from "%s" instead', path)
        self.global_config.load_config(path)

    def ensure_migrated(self) -> None:
        # import stuff late to make sure the correct log level is applied
        # before anything is logged
        # TODO since imports shouldn't run any code, this is fixed by moving towards DI
        from inputremapper.user import UserUtils

        if UserUtils.user != "root":
            # Might be triggered by udev, so skip the root user.
            # This will also refresh the config of the daemon if the user changed
            # it in the meantime.
            # config_dir is either the cli arg or the default path in home
            config_dir = os.path.dirname(self.global_config.path)
            self.daemon.set_config_dir(config_dir)
            self.migrations.migrate()

    def _stop(self, device: str) -> None:
        group = self._load_group(device)
        self.daemon.stop_injecting(group.key)

    def _quit(self) -> None:
        try:
            self.daemon.quit()
        except GLib.GError as error:
            if "NoReply" in str(error):
                # The daemon is expected to terminate, so there won't be a reply.
                return

            raise

    def _start(self, device: str, preset: str) -> None:
        group = self._load_group(device)

        logger.info(
            'Starting injection: "%s", "%s"',
            device,
            preset,
        )

        self.daemon.start_injecting(group.key, preset)

    def _load_group(self, device: str):
        """Load groups, check if a group exists for the given device and return it.
        Crash if it can't be found.

        device can be either a path like "/dev/input/event1" or a group key like
        "USB Optical Mouse",
        """

        # import stuff late to make sure the correct log level is applied
        # before anything is logged
        # TODO since imports shouldn't run any code, this is fixed by moving towards DI
        from inputremapper.groups import groups

        if device is None:
            logger.error("--device missing")
            sys.exit(3)

        # groups.find would also refresh it, but explicit is better than implicit
        groups.refresh()

        if device.startswith("/dev"):
            group = groups.find(path=device)
        else:
            group = groups.find(key=device)

        if group is None:
            logger.error(
                'Device "%s" is unknown, not an appropriate input device or you are '
                "missing permissions",
                device,
            )
            sys.exit(4)

        return group

    def _autoload(self, device: str) -> None:
        # if device was specified, autoload for that one. if None autoload
        # for all devices.
        if device is None:
            logger.info("Autoloading all")
            self.daemon.autoload(timeout=10000)
        else:
            group = self._load_group(device)
            logger.info(
                'Asking daemon to autoload for device "%s", group "%s"',
                device,
                group.key,
            )
            self.daemon.autoload_single(group.key, timeout=2000)

    def internals(self, command: str, debug: bool) -> None:
        """Methods that are needed to get the gui to work and that require root.

        input-remapper-control should be started with sudo or pkexec for this.
        """
        debug_flag = " -d" if debug else ""

        if command == Internals.START_READER_SERVICE.value:
            cmd = f"input-remapper-reader-service{debug_flag}"
        elif command == Internals.START_DAEMON.value:
            cmd = f"input-remapper-service --hide-info{debug_flag}"
        else:
            return

        # daemonize
        cmd = f"{cmd} &"
        logger.debug(f"Running `{cmd}`")
        os.system(cmd)

    def _num_logged_in_users(self) -> int:
        """Check how many users are logged in."""
        who = subprocess.run(["who"], stdout=subprocess.PIPE).stdout.decode()
        return len([user for user in who.split("\n") if user.strip() != ""])

    def _is_systemd_finished(self) -> bool:
        """Check if systemd finished booting."""
        try:
            systemd_analyze = subprocess.run(
                ["systemd-analyze"], stdout=subprocess.PIPE
            )
        except FileNotFoundError:
            # probably not systemd, lets assume true to not block input-remapper for good
            # on certain installations
            return True

        if "finished" in systemd_analyze.stdout.decode():
            # it writes into stderr otherwise or something
            return True

        return False

    def boot_finished(self) -> bool:
        """Check if booting is completed."""
        # Get as much information as needed to really safely determine if booting up is
        # complete.
        # - `who` returns an empty list on some system for security purposes
        # - something might be broken and might make systemd_analyze fail:
        #       Bootup is not yet finished
        #       (org.freedesktop.systemd1.Manager.FinishTimestampMonotonic=0).
        #       Please try again later.
        #       Hint: Use 'systemctl list-jobs' to see active jobs
        if self._is_systemd_finished():
            logger.debug("System is booted")
            return True

        if self._num_logged_in_users() > 0:
            logger.debug("User(s) logged in")
            return True

        return False

    def set_daemon(self, daemon):
        # TODO DI?
        self.daemon = daemon

    @staticmethod
    def parse_args() -> Options:
        parser = argparse.ArgumentParser()
        parser.add_argument(
            "--command",
            action="store",
            dest="command",
            help=(
                "Communicate with the daemon. Available commands are "
                f"{', '.join([command.value for command in Commands])}"
            ),
            default=None,
            metavar="NAME",
        )
        parser.add_argument(
            "--config-dir",
            action="store",
            dest="config_dir",
            help=(
                "path to the config directory containing config.json, "
                "xmodmap.json and the presets folder. "
                "defaults to ~/.config/input-remapper/"
            ),
            default=None,
            metavar="PATH",
        )
        parser.add_argument(
            "--preset",
            action="store",
            dest="preset",
            help="The filename of the preset without the .json extension.",
            default=None,
            metavar="NAME",
        )
        parser.add_argument(
            "--device",
            action="store",
            dest="device",
            help="One of the device keys from --list-devices",
            default=None,
            metavar="NAME",
        )
        parser.add_argument(
            "--list-devices",
            action="store_true",
            dest="list_devices",
            help="List available device keys and exit",
            default=False,
        )
        parser.add_argument(
            "--symbol-names",
            action="store_true",
            dest="key_names",
            help="Print all available names for the preset",
            default=False,
        )
        parser.add_argument(
            "-d",
            "--debug",
            action="store_true",
            dest="debug",
            help="Displays additional debug information",
            default=False,
        )
        parser.add_argument(
            "-v",
            "--version",
            action="store_true",
            dest="version",
            help="Print the version and exit",
            default=False,
        )

        return parser.parse_args(sys.argv[1:])  # type: ignore