import os
import select
import socket
import time
from threading import Lock, RLock, Condition, Thread
from typing import Callable, Optional, IO, Container

from . import mqtt, util
from .util import timestamp
from .door.constants import state_names

class DoorControlSocket(util.Loggable):
    class LineBuffer(object):
        def __init__(self, f, handler):
            self.data = b''
            self.f = f
            self.handler = handler

        def update(self):
            data = self.f.recv(1024)
            print(repr(data))
            if not data:
                print("Eep")
                return False
            self.data += data
            d = self.data.split(b'\n')
            d, self.data = d[:-1], d[-1]
            for i in d:
                print("Handling", repr(i))
                self.handler(self.f, i)
            return True
    
    def __init__(self, config, control, nfc):
        self._config = config
        self._control = control
        self._nfc = nfc
        self._fifo = self._open_control_socket()
        self._stop = True
        self._mutex = RLock()
        self._cond = Condition(self._mutex)

    def _open_control_socket(self) -> socket.socket:
        """(Re-)creates and opens the control socket. Config must have a control_socket member."""
        path = self._config.control_socket
        self._logger().debug(f"Opening control socket {path}")
        if os.path.exists(path):
            os.unlink(path)

        s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        s.bind(path)
        s.listen(5)
        return s

    def _run(self):
        buffers = {}
        sockets = []
        with self._cond:
            while not self._stop:
                if not self._fifo:
                    self._fifo = self._open_control_socket()
                    if not self._fifo:
                        time.sleep(5)
                        continue

                readable, _, _ = select.select(
                    [self._fifo] + sockets,
                    [], [], 1)
               
                for fd in readable:
                    if fd == self._fifo:
                        self._logger().debug("Got connection")
                        sock = fd.accept()[0]
                        buffers[sock] = DoorControlSocket.LineBuffer(sock, self.handle_cmd)
                        sockets += [sock]
                    else:
                        if not buffers[fd].update():
                            del buffers[fd]
                            sockets.remove(fd)
    
    def handle_cmd(self, comm, data):
        cmd = data.decode('utf8').split()
        try:
            cmd, args = cmd[0], cmd[1:]
        except:
            return
        
        self._logger().debug(f"Got command: {data}")
        send = lambda x: comm.send(x.encode('utf8'))

        if cmd == 'fake':
            self._logger().debug(f"Faking token {args[0]}")
            send("Handling token\n")
            self._nfc.handle_token(args[0])
        elif cmd == 'reset':
            self._logger().info("Resetting")
            send("Resetting MCU")
            self._control._comms.cmd_restart()
        elif cmd == 'open':
            if len(args) > 0:
                self._logger().info(f"Control socket opening door for {args[0]}")
                send("Opening door")
                self._control.open()
            else:
                send("Missing login")
        elif cmd == 'close':
            if len(args) > 0:
                self._logger().info(f"Control socket closing door for {args[0]}")
                send("Closing door")
                self._control.close()
            else:
                send("Missing login")
        elif cmd == 'rld':
            self._logger().debug("Reloading tokens")
            send("Reloading tokens")
            self._nfc._read_valid_tokens()
        elif cmd == 'stat':
            send("Door status is %s, position is %d. Current action: %s\n" % (
                self._control.state.str(),
            self._control.position(),
            self._control.target.str()))


    def start(self):
        with self._mutex:
            if self._stop:
                self._stop = False
                self._task = Thread(target=self._run, daemon=True)
                self._task.start()
    
    def stop(self):
        with self._cond:
            if not self._stop:
                self._stop = True
                self._cond.notify()
        self._task.join()



if __name__ == '__main__':
    import argparse

    parser = argparse.ArgumentParser()
    parser.add_argument("--serial_port", default="/dev/serial/by-id/usb-Imaginaerraum.de_DoorControl_43363220195053573A002C0-if01")
    parser.add_argument("--nfc_fifo", default="/tmp/nfc_fifo")
    parser.add_argument("--control_socket", default="/tmp/nfc.sock")
    parser.add_argument("--valid_tokens", default="/etc/door_tokens")
    parser.add_argument("--log_file", default="/tmp/nfc.log")
    parser.add_argument("--state_timeout", type=float, default=10)
    parser.add_argument("--state_timeout_speed", type=float, default=3)
    parser.add_argument("--repeat_time", type=float, default=COMMAND_IDLE_TIME)
    parser.add_argument("--mqtt_host", default="10.10.21.2")
    config = parser.parse_args()
    util.init_logging()

    def start():
        dc = DoorControl(config)
        dc._comms.start()
        t = Thread(target=dc.run)
        t.start()
        return dc