import smtplib

from string import Template

from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText

MY_ADDRESS = 'marlene.bargou@tum.de'
PASSWORD = 'password'  # TODO: delete password
LINK = 'http://localhost:8000/room/raum1/?participant_label='


def get_contacts(filename):
    """
    Return two lists names, emails containing names and email addresses
    read from a file specified by filename.
    """
    mail = []
    label = []
    with open(filename, mode='r', encoding='utf-8') as contacts:
        for contact in contacts:
            mail.append(contact.split()[0])
            label.append(contact.split()[1])
    return mail, label


def read_template(filename):
    """
    Returns a Template object comprising the contents of the 
    file specified by filename.
    """

    with open(filename, 'r', encoding='utf-8') as template_file:
        template_file_content = template_file.read()
    return Template(template_file_content)


def main():
    mail, label = get_contacts('contacts.txt')  # read contacts
    message_template = read_template('message.txt')

    # set up the SMTP server
    s = smtplib.SMTP(host='postout.lrz.de', port=587)
    s.starttls()
    s.login(MY_ADDRESS, PASSWORD)

    # For each contact, send the email:
    for mail, label in zip(mail, label):
        msg = MIMEMultipart()  # create a message

        # add in the actual person name to the message template
        message = message_template.substitute(OTREE_LINK=LINK, HASH_LABEL=label)

        # Prints out the message body for our sake
        print(message)

        # setup the parameters of the message
        msg['From'] = MY_ADDRESS
        msg['To'] = mail
        msg['Subject'] = "Experiment"

        # add in the message body
        msg.attach(MIMEText(message, 'plain'))

        # send the message via the server set up earlier.
        s.send_message(msg)
        del msg

    # Terminate the SMTP session and close the connection
    s.quit()


if __name__ == '__main__':
    main()