#!/usr/bin/env python3
import argparse
from dataclasses import dataclass
from pathlib import Path

import gi
from clan_cli import vms

from clan_vm_manager.windows.flash import FlashUSBWindow

gi.require_version("Gtk", "3.0")

import multiprocessing as mp

from clan_cli.clan_uri import ClanURI
from gi.repository import Gio, Gtk

from .constants import constants
from .errors.show_error import show_error_dialog
from .executor import ProcessManager
from .interfaces import Callbacks, InitialFlashValues, InitialJoinValues
from .windows.join import JoinWindow
from .windows.overview import OverviewWindow


@dataclass
class ClanWindows:
    join: type[JoinWindow]
    overview: type[OverviewWindow]
    flash_usb: type[FlashUSBWindow]


@dataclass
class ClanConfig:
    initial_window: str
    url: ClanURI | None


# Will be executed in the context of the child process
def on_except(error: Exception, proc: mp.process.BaseProcess) -> None:
    show_error_dialog(str(error))


class Application(Gtk.Application):
    def __init__(self, windows: ClanWindows, config: ClanConfig) -> None:
        super().__init__(
            application_id=constants["APPID"], flags=Gio.ApplicationFlags.FLAGS_NONE
        )
        self.init_style()
        self.windows = windows
        self.proc_manager = ProcessManager()
        initial = windows.__dict__[config.initial_window]
        self.cbs = Callbacks(
            show_list=self.show_list,
            show_join=self.show_join,
            show_flash=self.show_flash,
            spawn_vm=self.spawn_vm,
            stop_vm=self.stop_vm,
            running_vms=self.running_vms,
        )
        if issubclass(initial, JoinWindow):
            # see JoinWindow constructor
            self.window = initial(
                initial_values=InitialJoinValues(url=config.url or ""),
                cbs=self.cbs,
            )

        if issubclass(initial, OverviewWindow):
            # see OverviewWindow constructor
            self.window = initial(cbs=self.cbs)

        # Connect to the shutdown signal
        self.connect("shutdown", self.on_shutdown)

    def on_shutdown(self, app: Gtk.Application) -> None:
        print("Shutting down")
        self.proc_manager.kill_all()

    def spawn_vm(self, url: str, attr: str) -> None:
        print(f"spawn_vm {url}")

        # TODO: We should use VMConfig from the history file
        vm = vms.run.inspect_vm(flake_url=url, flake_attr=attr)
        log_path = Path(".")

        # TODO: We only use the url as the ident. This is not unique as the flake_attr is missing.
        # when we migrate everything to use the ClanURI class we can use the full url as the ident
        self.proc_manager.spawn(
            ident=url,
            on_except=on_except,
            log_path=log_path,
            func=vms.run.run_vm,
            vm=vm,
        )

    def stop_vm(self, url: str, attr: str) -> None:
        self.proc_manager.kill(url)

    def running_vms(self) -> list[str]:
        return self.proc_manager.running_procs()

    def show_list(self) -> None:
        prev = self.window
        self.window = self.windows.__dict__["overview"](cbs=self.cbs)
        self.window.set_application(self)
        prev.hide()

    def show_join(self) -> None:
        prev = self.window
        self.window = self.windows.__dict__["join"](
            cbs=self.cbs, initial_values=InitialJoinValues(url=None)
        )
        self.window.set_application(self)
        prev.hide()

    def show_flash(self) -> None:
        prev = self.window
        self.window = self.windows.__dict__["flash_usb"](
            cbs=self.cbs, initial_values=InitialFlashValues(None)
        )
        self.window.set_application(self)
        prev.hide()

    def do_startup(self) -> None:
        Gtk.Application.do_startup(self)
        Gtk.init()

    def do_activate(self) -> None:
        win = self.props.active_window
        if not win:
            win = self.window
            win.set_application(self)
        win.present()

    # TODO: For css styling
    def init_style(self) -> None:
        pass
        # css_provider = Gtk.CssProvider()
        # css_provider.load_from_resource(constants['RESOURCEID'] + '/style.css')
        # screen = Gdk.Screen.get_default()
        # style_context = Gtk.StyleContext()
        # style_context.add_provider_for_screen(screen, css_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)


def show_join(args: argparse.Namespace) -> None:
    print(f"Joining clan {args.clan_uri}")
    app = Application(
        windows=ClanWindows(
            join=JoinWindow, overview=OverviewWindow, flash_usb=FlashUSBWindow
        ),
        config=ClanConfig(url=args.clan_uri, initial_window="join"),
    )
    return app.run()


def register_join_parser(parser: argparse.ArgumentParser) -> None:
    parser.add_argument("clan_uri", type=ClanURI, help="clan URI to join")
    parser.set_defaults(func=show_join)


def show_overview(args: argparse.Namespace) -> None:
    app = Application(
        windows=ClanWindows(
            join=JoinWindow, overview=OverviewWindow, flash_usb=FlashUSBWindow
        ),
        config=ClanConfig(url=None, initial_window="overview"),
    )
    return app.run()


def register_overview_parser(parser: argparse.ArgumentParser) -> None:
    parser.set_defaults(func=show_overview)


# def register_run_parser(parser: argparse.ArgumentParser) -> None:
#     parser.set_defaults(func=show_run_vm)