from threading import Timer
import re

#==================================================================#
# Decorator to prevent a function's actions from being run until
# at least x seconds have passed without the function being called
#==================================================================#
def debounce(wait): 
    def decorator(fun):
        def debounced(*args, **kwargs):
            def call_it():
                fun(*args, **kwargs)
 
            try:
                debounced.t.cancel()
            except AttributeError:
                pass
 
            debounced.t = Timer(wait, call_it)
            debounced.t.start()
 
        return debounced
 
    return decorator

#==================================================================#
# Replace fancy quotes and apostrope's with standard ones
#==================================================================#
def fixquotes(txt):
    txt = txt.replace("“", '"')
    txt = txt.replace("”", '"')
    txt = txt.replace("’", "'")
    txt = txt.replace("`", "'")
    return txt

#==================================================================#
# 
#==================================================================#
def trimincompletesentence(txt):
    # Cache length of text
    ln = len(txt)
    # Find last instance of punctuation (Borrowed from Clover-Edition by cloveranon)
    lastpunc = max(txt.rfind("."), txt.rfind("!"), txt.rfind("?"))
    # Is this the end of a quote?
    if(lastpunc < ln-1):
        if(txt[lastpunc+1] == '"'):
            lastpunc = lastpunc + 1
    if(lastpunc >= 0):
        txt = txt[:lastpunc+1]
    return txt

#==================================================================#
# 
#==================================================================#
def replaceblanklines(txt):
    txt = txt.replace("\n\n", "\n")
    return txt

#==================================================================#
# 
#==================================================================#
def removespecialchars(txt, vars=None):
    if vars is None or vars.actionmode == 0:
        txt = re.sub(r"[#/@%<>{}+=~|\^]", "", txt)
    else:
        txt = re.sub(r"[#/@%{}+=~|\^]", "", txt)
    return txt

#==================================================================#
# If the next action follows a sentence closure, add a space
#==================================================================#
def addsentencespacing(txt, vars):
    # Get last character of last action
    if(len(vars.actions) > 0):
        if(len(vars.actions[vars.actions.get_last_key()]) > 0):
            lastchar = vars.actions[vars.actions.get_last_key()][-1]
        else:
            # Last action is blank, this should never happen, but
            # since it did let's bail out.
            return txt
    else:
        lastchar = vars.prompt[-1]
    if(lastchar == "." or lastchar == "!" or lastchar == "?" or lastchar == "," or lastchar == ";" or lastchar == ":"):
        txt = " " + txt
    return txt

#==================================================================#
#  Cleans string for use in file name
#==================================================================#
def cleanfilename(filename):
    keepcharacters = (' ','.','_')
    filename = "".join(c for c in filename if c.isalnum() or c in keepcharacters).rstrip()
    return filename