#!/usr/bin/python

import csv
import os
import smtplib
import subprocess
import sys


sender_header = 'mail-merge-sender@mit.edu'
smtp = None

def dictize_line(header, line,):
    line_dict = {}
    for key, elem in zip(header, line, ):
        line_dict[key]=elem
    return line_dict

def setup_sendmail_smtp():
    global smtp
    smtp = smtplib.SMTP()
    smtp.connect()
def sendmail_smtp(addrs, text):
    global smtp
    smtp.sendmail(sender_header, addrs, text, )
smtp_funcs = (setup_sendmail_smtp, sendmail_smtp, )

def sendmail_cmd(addrs, text):
    args = ["/usr/lib/sendmail", "--", ]
    args.extend(addrs)
    proc = subprocess.Popen(args, stdin=subprocess.PIPE)
    proc.communicate(text)
cmd_funcs = (lambda: True, sendmail_cmd)

setup_sendmail, sendmail = smtp_funcs
setup_sendmail, sendmail = cmd_funcs

def mail_merge(cc_addr, email_file, recipients_file):
    email = open(email_file, 'r').read()
    reader = csv.reader(open(recipients_file, 'r'))
    header = reader.next()
    print header
    for line in reader:
        dct = dictize_line(header, line, )
        print dct
        text = email % dct
        sendmail([dct['email'], cc_addr, ], text, )

if __name__=='__main__':
    print "Syntax: $script $cc_addr $template $recipients"
    setup_sendmail()
    cc_addr = sys.argv[1]
    email_file = sys.argv[2]
    recipients_file = sys.argv[3]
    mail_merge(cc_addr, email_file, recipients_file, )