from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.nonmultipart import MIMENonMultipart
from email.Utils import formatdate
from email import encoders

from postgresqleu.util.context_processors import settings_context

from django.template import Context
from django.template.loader import get_template

from models import QueuedMail

def template_to_string(templatename, attrs = {}):
	context = Context(attrs)
	context.update(settings_context())
	return get_template(templatename).render(context)

def send_template_mail(sender, receiver, subject, templatename, templateattr={}, attachments=None, bcc=None, sendername=None, receivername=None):
	send_simple_mail(sender, receiver, subject,
					 template_to_string(templatename, templateattr),
					 attachments, bcc, sendername, receivername)

def send_simple_mail(sender, receiver, subject, msgtxt, attachments=None, bcc=None, sendername=None, receivername=None):
	# attachment format, each is a tuple of (name, mimetype,contents)
	# content should be *binary* and not base64 encoded, since we need to
	# use the base64 routines from the email library to get a properly
	# formatted output message
	msg = MIMEMultipart()
	msg['Subject'] = subject
	if receivername:
		msg['To'] = u'{0} <{1}>'.format(receivername, receiver)
	else:
		msg['To'] = receiver
	if sendername:
		msg['From'] = u'{0} <{1}>'.format(sendername, sender)
	else:
		msg['From'] = sender
	msg['Date'] = formatdate(localtime=True)

	msg.attach(MIMEText(msgtxt, _charset='utf-8'))

	if attachments:
		for filename, contenttype, content in attachments:
			main,sub = contenttype.split('/')
			part = MIMENonMultipart(main,sub)
			part.set_payload(content)
			part.add_header('Content-Disposition', 'attachment; filename="%s"' % filename)
			encoders.encode_base64(part)
			msg.attach(part)


	# Just write it to the queue, so it will be transactionally rolled back
	QueuedMail(sender=sender, receiver=receiver, fullmsg=msg.as_string()).save()
	# Any bcc is just entered as a separate email
	if bcc:
		QueuedMail(sender=sender, receiver=bcc, fullmsg=msg.as_string()).save()

def send_mail(sender, receiver, fullmsg):
	# Send an email, prepared as the full MIME encoded mail already
	QueuedMail(sender=sender, receiver=receiver, fullmsg=fullmsg).save()