import ui
from conf import conf
import events

COMMAND_PREFIX = conf["command_prefix"] or "/"

# normal server commands
srv_commands = ['PING', 'JOIN', 'PART', 'MODE', 'SERVER', 'KICK',
                'QUIT', 'NICK', 'PRIVMSG', 'NOTICE', 'TOPIC']

#internal commands, uppercased for consistency
urk_commands =  [x[len('Command'):].upper() for x in events.events if x.startswith('Command')]

commands = srv_commands + urk_commands

def completer(cmd):
    while True:
        for s in commands:
            if s.startswith(cmd.upper()):
                 yield s
        yield cmd

def onKeyPress(e):
    global cmd_completer

    if e.key == 'Tab':
        i = e.window.input

        left, right = i.text[:i.cursor], i.text[i.cursor:]

        if left.startswith(COMMAND_PREFIX):
            cmd = left[len(COMMAND_PREFIX):]

            if not cmd_completer:
                cmd_completer = completer(cmd)

            cmd = cmd_completer.next()

            i.text = COMMAND_PREFIX + cmd + right
            i.cursor = len(COMMAND_PREFIX) + len(cmd)
    else:
        cmd_completer = None

def onActive(window):
    global cmd_completer

    cmd_completer = None