import xml.etree.cElementTree as ET
#from collections import defaultdict
import re
#import pprint

OSMFILE = "sample.osm"

def update_phones(phone):
    #remove all non character digit
    n=''.join(ele for ele in phone if ele.isdigit())
    # if phone has 1 in front, drop 1 (no area code begins with 1) and update it.
    if n[0] == 1:
        update_numbers = format(int(n[1:-1]), ",").replace(",", "-") + n[-1]

    #store phone # with missing area codes in "Miss_area_code" list
    Miss_area_code = []

    if len(n)< 10:
        Miss_area_code.append(phone)
        print Miss_area_code

    if len(n) == 10:

        # then separate the thousand by "," and then replace "," with "-", and add the last digit.
        update_numbers = format(int(n[:-1]), ",").replace(",", "-") + n[-1]
    update_numbers.append(phone)
    return update_numbers
    print update_numbers



def is_phone(elem):
    return (elem.attrib['k'] == "phone") # look for attrib 'k' with value 'phone'


def audit(osmfile):
    osm_file = open(osmfile, "r")

    for event, elem in ET.iterparse(osm_file, events=("start",)):

        if elem.tag == "node" or elem.tag == "way":
            for tag in elem.iter("tag"):
                if is_phone(tag): # from the def above, with "k"= "phone"
                    update_numbers(update_phones(tag.attrib['v'])) # go through the def above with attrib "v"

    osm_file.close()
    #print (street_types)
    return update_numbers