import asyncio
import signal
from concurrent.futures import Future
from pathlib import Path
from threading import Thread
from typing import Any, Coroutine, Dict, List, Optional, Sequence
from uuid import uuid4

from appdirs import AppDirs

from . import __about__
from .events.app import CoroutineDone, ExitRequested


class App:
    def __init__(self) -> None:
        self.appdirs = AppDirs(appname=__about__.__pkg_name__, roaming=True)

        from .backend import Backend
        self.backend = Backend(app=self)

        self.loop        = asyncio.get_event_loop()
        self.loop_thread = Thread(target=self._loop_starter)
        self.loop_thread.start()


    def is_debug_on(self, cli_flags: Sequence[str] = ()) -> bool:
        return "-d" in cli_flags or "--debug" in cli_flags


    def _loop_starter(self) -> None:
        asyncio.set_event_loop(self.loop)
        self.loop.run_forever()


    def run_in_loop(self, coro: Coroutine) -> Future:
        return asyncio.run_coroutine_threadsafe(coro, self.loop)


    def _call_coro(self, coro: Coroutine) -> str:
        uuid = str(uuid4())

        self.run_in_loop(coro).add_done_callback(
            lambda future: CoroutineDone(uuid=uuid, result=future.result())
        )
        return uuid


    def call_backend_coro(self,
                          name:   str,
                          args:   Optional[List[str]]      = None,
                          kwargs: Optional[Dict[str, Any]] = None) -> str:
        return self._call_coro(
            getattr(self.backend, name)(*args or [], **kwargs or {})
        )


    def call_client_coro(self,
                         account_id: str,
                         name:       str,
                         args:       Optional[List[str]]      = None,
                         kwargs:     Optional[Dict[str, Any]] = None) -> str:
        client = self.backend.clients[account_id]
        return self._call_coro(
            getattr(client, name)(*args or [], **kwargs or {})
        )


    def pdb(self, additional_data: Sequence = ()) -> None:
        # pylint: disable=all
        ad = additional_data
        rl = self.run_in_loop
        ba = self.backend
        cl = self.backend.clients
        tcl = lambda user: cl[f"@test_{user}:matrix.org"]

        import json
        jd = lambda obj: print(json.dumps(obj, indent=4, ensure_ascii=False))

        print("\n=> Run `socat readline tcp:127.0.0.1:4444` in a terminal "
              "to connect to pdb.")
        import remote_pdb
        remote_pdb.RemotePdb("127.0.0.1", 4444).set_trace()


# Make CTRL-C work again
signal.signal(signal.SIGINT, signal.SIG_DFL)

APP = App()