from django.conf import settings
from django.core import mail
from email.MIMEText import MIMEText
from email.Header import Header
import smtplib, rfc822
from pycon.features.decorators import feature

## email package will roll over to a different encoding if the default doesnt work.
DEFAULT_EMAIL_CHARSET = getattr(settings, 'DEFAULT_EMAIL_CHARSET', settings.DEFAULT_CHARSET)
DEFAULT_EMAIL_SUBJECT_CHARSET = getattr(settings, 'DEFAULT_EMAIL_SUBJECT_CHARSET', DEFAULT_EMAIL_CHARSET)
setattr(settings, 'DEFAULT_EMAIL_CHARSET', DEFAULT_EMAIL_CHARSET)
setattr(settings, 'DEFAULT_EMAIL_SUBJECT_CHARSET', DEFAULT_EMAIL_SUBJECT_CHARSET)

class SafeMIMEText(mail.SafeMIMEText):
    def __setitem__(self, name, val):
        "Forbids multi-line headers, to prevent header injection."
        if '\n' in val or '\r' in val:
            raise mail.BadHeaderError, "Header values can't contain newlines (got %r for header %r)" % (val, name)
        if name == "Subject":
            val = Header(val, settings.DEFAULT_EMAIL_SUBJECT_CHARSET)
        MIMEText.__setitem__(self, name, val)
#mail.SafeMIMEText = SafeMIMEText

@feature('SendMassMail', disabled_func=0, auto_create_feat=True)
def send_mass_mail(datatuple, fail_silently=False,
                   auth_user=settings.EMAIL_HOST_USER,
                   auth_password=settings.EMAIL_HOST_PASSWORD):
    """
    Given a datatuple of (subject, message, from_email, recipient_list), sends
    each message to each recipient list. Returns the number of e-mails sent.

    If from_email is None, the DEFAULT_FROM_EMAIL setting is used.
    If auth_user and auth_password are set, they're used to log in.
    """
    try:
        server = smtplib.SMTP(settings.EMAIL_HOST, settings.EMAIL_PORT)
        if auth_user and auth_password:
            server.login(auth_user, auth_password)
    except:
        if fail_silently:
            return
        raise
    num_sent = 0
    for subject, message, from_email, recipient_list in datatuple:
        if not recipient_list:
            continue
        from_email = from_email or settings.DEFAULT_FROM_EMAIL
        msg = SafeMIMEText(message, 'plain', settings.DEFAULT_EMAIL_CHARSET)
        msg['Subject'] = subject
        msg['From'] = from_email
        msg['To'] = ', '.join(recipient_list)
        msg['Date'] = rfc822.formatdate()
        try:
            server.sendmail(from_email, recipient_list, msg.as_string())
            num_sent += 1
        except:
            if not fail_silently:
                raise
    try:
        server.quit()
    except:
        if fail_silently:
            return
        raise
    return num_sent

@feature('SendMail', disabled_func=0, auto_create_feat=True)
def send_mail(subject, message, from_email, recipient_list, fail_silently=False,
              auth_user=settings.EMAIL_HOST_USER, auth_password=settings.EMAIL_HOST_PASSWORD):
    """
    Easy wrapper for sending a single message to a recipient list. All members
    of the recipient list will see the other recipients in the 'To' field.
    """
    return send_mass_mail([[subject, message, from_email, recipient_list]], fail_silently, auth_user, auth_password)

mail_admins = feature('MailAdmins', disabled_func=None,
                      auto_create_feat=True)(mail.mail_admins)

mail_managers = feature('MailManagers', disabled_func=None,
                        auto_create_feat=True)(mail.mail_managers)

#mail.mail_admins = mail_admins
#mail.mail_managers = mail_managers