import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders
import os

files = []

#Credentials
sender_username = 'pythonmailertst@gmail.com'
sender_password = 'testacc99'
recipient_username = 'nasifistiak@gmail.com'
subject = 'Python Test Email'
body = 'Hello World.'

fileDirectory = "FilesToSend/"
numberOfFilesToPick = 2
temp = []

msg = MIMEMultipart()
def msgInit():
    global msg
    msg = MIMEMultipart()
    msg['From'] = sender_username
    msg['To'] = recipient_username
    msg['Subject'] = subject
    msg.attach((MIMEText(body, 'plain')))

msgInit()

server = smtplib.SMTP('smtp.gmail.com', 587)
server.starttls()
server.login(sender_username, sender_password)

def messageSenderFunc():
    text = msg.as_string()
    #server.sendmail(sender_username, recipient_username, text)
    msgInit()
    print(temp)
    temp.clear()

def combinationUtil(arr, temp, start, end, index, r):

    if (index == r):
        for j in temp:
            msg.attach(j)
        messageSenderFunc()
        return

    i = start
    while (i <= end and end - i + 1 >= r - index):
        temp.append(arr[i])
        combinationUtil(arr, temp, i + 1, end, index + 1, r)
        i+=1

fileCount=0

for filename in os.listdir(fileDirectory):
    attachment = open(fileDirectory+filename, 'rb')
    part = MIMEBase('application', 'octet-stream')
    part.set_payload(attachment.read())
    encoders.encode_base64(part)
    part.add_header('Content-Disposition', 'attachment; filename= ' + filename)
    files.append(part)
    fileCount += 1

combinationUtil(files, temp, 0, fileCount-1, 0, numberOfFilesToPick)
server.quit()