import email
import socket
import os
import logging

try:
    from email.mime.multipart import MIMEMultipart
    from email.mime.text import MIMEText
    from email.mime.image import MIMEImage
    from email.header import Header
except:
    from email.MIMEMultipart import MIMEMultipart
    from email.MIMEText import MIMEText
    from email.MIMEImage import MIMEImage
    from email.Header import Header

from django.core.mail import DNS_NAME
from smtplib import SMTP
from smtplib import SMTPRecipientsRefused
from forum import settings
from django.template import loader, Context, Template
from forum.utils.html import sanitize_html
from forum.context import application_settings
from forum.utils.html2text import HTML2Text
from threading import Thread

def send_template_email(recipients, template, context):
    t = loader.get_template(template)
    context.update(dict(recipients=recipients, settings=settings))
    t.render(Context(context))

def create_connection():
    connection = SMTP(str(settings.EMAIL_HOST), str(settings.EMAIL_PORT),
                          local_hostname=DNS_NAME.get_fqdn())

    if bool(settings.EMAIL_USE_TLS):
        connection.ehlo()
        connection.starttls()
        connection.ehlo()

    if settings.EMAIL_HOST_USER and settings.EMAIL_HOST_PASSWORD:
        connection.login(str(settings.EMAIL_HOST_USER), str(settings.EMAIL_HOST_PASSWORD))

    return connection


def create_and_send_mail_messages(messages):
    if not settings.EMAIL_HOST:
        return

    sender = Header(unicode(settings.APP_SHORT_NAME), 'utf-8')
    sender.append('<%s>' % unicode(settings.DEFAULT_FROM_EMAIL))
    sender = u'%s <%s>' % (unicode(settings.APP_SHORT_NAME), unicode(settings.DEFAULT_FROM_EMAIL))

    reply_to = unicode(settings.DEFAULT_REPLY_TO_EMAIL)

    try:
        connection = None

        if sender is None:
            sender = str(settings.DEFAULT_FROM_EMAIL)

        for recipient, subject, html, text, media in messages:
            if connection is None:
                connection = create_connection()

            msgRoot = MIMEMultipart('related')

            msgRoot['Subject'] = Header(subject, 'utf-8')
            msgRoot['From'] = sender

            to = Header(u"%s <%s>" % (recipient.username, recipient.email), 'utf-8')
            msgRoot['To'] = to

            if reply_to:
                msgRoot['Reply-To'] = reply_to

            msgRoot.preamble = 'This is a multi-part message from %s.' % unicode(settings.APP_SHORT_NAME).encode('utf8')

            msgAlternative = MIMEMultipart('alternative')
            msgRoot.attach(msgAlternative)

            msgAlternative.attach(MIMEText(text.encode('utf-8'), _charset='utf-8'))
            msgAlternative.attach(MIMEText(html.encode('utf-8'), 'html', _charset='utf-8'))

            for alias, location in media.items():
                fp = open(location, 'rb')
                msgImage = MIMEImage(fp.read())
                fp.close()
                msgImage.add_header('Content-ID', '<'+alias+'>')
                msgRoot.attach(msgImage)

            try:
                connection.sendmail(sender, [recipient.email], msgRoot.as_string())
            except SMTPRecipientsRefused, e:
                logging.error("Email address not accepted.  Exception: %s" % e)
            except Exception, e:
                logging.error("Couldn't send mail using the sendmail method: %s" % e)
                try:
                    connection.quit()
                except Exception, e:
                    logging.error(e)
                finally:
                    connection = None

        try:
            connection.quit()
        except AttributeError:
            pass
        except socket.sslerror:
            connection.close()
    except Exception, e:
        logging.error('Email sending has failed: %s' % e)
