#!/usr/bin/python3
import os
import readline
import shlex
import sys
import subprocess
import socket

tuerSock = "/run/tuer.sock"

# use a histfile
histfile = os.path.join(os.path.expanduser("~"), ".tyshellhist")
try:
    readline.read_history_file(histfile)
except IOError:
    pass
import atexit
atexit.register(readline.write_history_file, histfile)

# available commands
def helpcmd(c):
	print("Available commands: %s" % ", ".join(sorted(commands.keys())))

def extcmd(cmd):
	def run(c):
		ret = subprocess.call(cmd)
		if ret != 0:
			print("Command returned non-zero exit statis %d" % ret)
	return run

def sendcmd(addr, cmd):
	def run(c):
		print("Running %s..." % (cmd))
		s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
		s.connect(addr)
		s.settimeout(10.0)
		s.send(cmd.encode())
		data = s.recv(4)
		s.close()
		print(data.decode('utf-8'))
	return run

def exitcmd(c):
	print("Bye")
	return True

commands = {
	'exit': exitcmd,
	'help': helpcmd,
	'open': sendcmd(tuerSock, 'open'),
	'close': sendcmd(tuerSock, 'close'),
	'buzz': sendcmd(tuerSock, 'buzz'),
}

# input loop
print("Welcome to tyshell. Use help to see what you can do.")
while True:
	try:
		command = input("$ ")
	except EOFError:
		print()
		break
	command = shlex.split(command)
	if not len(command): continue
	# find suiting commands
	if command[0] in commands: # needed in case a complete command is a prefix of another one
		cmdoptions = [command[0]]
	else:
		cmdoptions = list(filter(lambda x: command[0].startswith(x), commands.keys()))
	# check how many we found
	if len(cmdoptions) == 0: # no commands fit prefix
		print("Command %s not found. Use help." % command[0])
	elif len(cmdoptions) == 1: # exactly one command fits (prefix)
		try:
			res = commands[cmdoptions[0]](command)
			if res: break
		except Exception as e:
			print("Error while executing %s: %s" % (command[0], str(e)))
	else: # multiple commands fit the prefix
		print("Ambiguous command prefix, please choose one of the following:")
		print("\t", " ".join(cmdoptions))
		# TODO: put current "command[0]" into the shell for the next command, but such that it is deletable with backspace