#
#   email.py
#
#   This module is essentially a wrapper for Python's premailer and whatever
#   the default mail handler is.
#

import logging
logger = logging.getLogger(__name__)

from os.path import isfile
from premailer import transform
from email.mime.text import MIMEText
import subprocess

def mailprep(htmlin, stylesheet):
    logger.debug("Converting stylesheet " + stylesheet + " to inline tags")
    if not isfile(stylesheet):
        logger.warning("Cannot read stylesheet {}: file does not exist".format(stylesheet))
        raise FileNotFoundError 
    pm = premailer.Premailer(htmlin, external_styles=stylesheet)
    htmlout = pm.transform()
    logger.info("Converted stylesheet to inline tags")
    return htmlout


def sendmail(mailbin, body, recipient, subject, *sender):
    logger.debug("Sending email")
    msg = MIMEText(body)
    if sender:
        msg["From"] = sender
    msg["To"] = recipient
    msg["Subject"] = subject
    mailproc = subprocess.Popen([mailbin, '--debug-level=10', '-t'], stdin=subprocess.PIPE, stdout=subprocess.PIPE)
    logger.debug("Compiled message and opened process")
    try:
        stdout = mailproc.communicate(msg.as_bytes(), timeout=15)
        logger.debug("sendmail output: {}".format(stdout))
        logger.info("Sent email")
        return 0
#    except TimeoutExpired:
#        mailproc.kill()
#        stdout = mailproc.communicate()
#        logger.debug("Timeout expired: {}".format(stdout))
#        raise subprocess.TimeoutError
    except Exception as e:
        mailproc.kill()
        logger.warning("Failed to send message: {0}".format(str(e)))
#        raise ChildProcessError