"""Common utilies to format / semd emails.

:organization: Logilab

:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

from email.MIMEMultipart import MIMEMultipart

from email.MIMEText import MIMEText

from email.MIMEImage import MIMEImage

from email.Header import Header

def header(ustring):

    return Header(ustring.encode('UTF-8'), 'UTF-8')

def addrheader(uaddr, uname=None):

    # even if an email address should be ascii, encode it using utf8 since

    # automatic tests may generate non ascii email address

    addr = uaddr.encode('UTF-8')

    if uname:

        return '%s <%s>' % (header(uname).encode(), addr)

    return addr

def format_mail(uinfo, to_addrs, content, subject="",

                cc_addrs=(), msgid=None, references=(), config=None):

    """Sends an Email to 'e_addr' with content 'content', and subject 'subject'

    to_addrs and cc_addrs are expected to be a list of email address without

    name

    """

    assert type(content) is unicode, repr(content)

    msg = MIMEText(content.encode('UTF-8'), 'plain', 'UTF-8')

    # safety: keep only the first newline

    subject = subject.splitlines()[0]

    msg['Subject'] = header(subject)

    if uinfo.get('email'):

        email = uinfo['email']

    elif config and config['sender-addr']:

        email = unicode(config['sender-addr'])

    else:

        email = u''

    if uinfo.get('name'):

        name = uinfo['name']

    elif config and config['sender-addr']:

        name = unicode(config['sender-name'])

    else:

        name = u''

    msg['From'] = addrheader(email, name)

    if config and config['sender-addr'] and config['sender-addr'] != email:

        appaddr = addrheader(config['sender-addr'], config['sender-name'])

        msg['Reply-to'] = '%s, %s' % (msg['From'], appaddr)

    elif email:

        msg['Reply-to'] = msg['From']

    if config is not None:

        msg['X-CW'] = config.appid

    unique_addrs = lambda addrs: sorted(set(addr for addr in addrs if addr is not None))

    msg['To'] = ', '.join(addrheader(addr) for addr in unique_addrs(to_addrs))

    if cc_addrs:

        msg['Cc'] = ', '.join(addrheader(addr) for addr in unique_addrs(cc_addrs))

    if msgid:

        msg['Message-id'] = msgid

    if references:

        msg['References'] = ', '.join(references)

    return msg

class HtmlEmail(MIMEMultipart):

    def __init__(self, subject, textcontent, htmlcontent,

                 sendermail=None, sendername=None, recipients=None, ccrecipients=None):

        MIMEMultipart.__init__(self, 'related')

        self['Subject'] = header(subject)

        self.preamble = 'This is a multi-part message in MIME format.'

        # Attach alternative text message

        alternative = MIMEMultipart('alternative')

        self.attach(alternative)

        msgtext = MIMEText(textcontent.encode('UTF-8'), 'plain', 'UTF-8')

        alternative.attach(msgtext)

        # Attach html message

        msghtml = MIMEText(htmlcontent.encode('UTF-8'), 'html', 'UTF-8')

        alternative.attach(msghtml)

        if sendermail or sendername:

            self['From'] = addrheader(sendermail, sendername)

        if recipients:

            self['To'] = ', '.join(addrheader(addr) for addr in recipients if addr is not None)

        if ccrecipients:

            self['Cc'] = ', '.join(addrheader(addr) for addr in ccrecipients if addr is not None)

    def attach_image(self, data, htmlId):

        image = MIMEImage(data)

        image.add_header('Content-ID', '<%s>' % htmlId)

        self.attach(image)