from uuid import uuid4
from enum import IntEnum
from collections import namedtuple

from telethon.utils import get_display_name

Command = namedtuple(
  'Command', 
  'name argc args args_string'
)

class Kind(IntEnum):
  CANNOT_APPLY_TO_SELF = 0
  CAN_APPLY_TO_SELF    = 1
  NO_TARGET            = 2

def parse_command(text):
  text = text.strip()

  if not text.startswith('/'):
    raise ValueError

  text = text.split(' ')

  if len(text) < 1:
    raise ValueError

  command = text[0][1:].lower()

  if '@' in command:
    command = command.split('@')
    command = command[0]

  args = text[1:]
  argc = len(args)
  args_string = ' '.join(args)

  return Command(
    name=command, 
    argc=argc, 
    args=args, 
    args_string=args_string
  )

def get_link_to_user(user):
  full_name = get_display_name(user)
  if not full_name:
    full_name = user.username
  
  if not full_name:
    full_name = '?'

  if user.username:
    return f'[{full_name}](@{user.username})'

  return f'[{full_name}](tg://user?id={user.id})'

def is_valid_name(name):
  return name.isidentifier()

def make_temporary_filename(ext):
  uid = uuid4().hex

  return f'tmp_{uid}.{ext}'

def parse_kind(kind):
  kind = int(kind)

  if kind < 0 or kind > 2:
    raise ValueError

  return kind