# -*- coding: utf-8 -*-

"""

    rhodecode.lib.smtp_mailer

    ~~~~~~~~~~~~~~~~~~~~~~~~~

    Simple smtp mailer used in RhodeCode

    :created_on: Sep 13, 2010

    :copyright: (C) 2009-2011 Marcin Kuzminski <marcin@python-works.com>

    :license: GPLv3, see COPYING for more details.

"""

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import logging

import smtplib

import mimetypes

from socket import sslerror

from email.mime.multipart import MIMEMultipart

from email.mime.image import MIMEImage

from email.mime.audio import MIMEAudio

from email.mime.base import MIMEBase

from email.mime.text import MIMEText

from email.utils import formatdate

from email import encoders

class SmtpMailer(object):

    """SMTP mailer class

                        mail_port, ssl, tls)

    mailer.send(recipients, subject, body, attachment_files)

    :param recipients might be a list of string or single string

    :param attachment_files is a dict of {filename:location}

        it tries to guess the mimetype and attach the file

    """

                    mail_port=None, ssl=False, tls=False, debug=False):

        self.mail_from = mail_from

        self.mail_server = mail_server

        self.mail_port = mail_port

        self.user = user

        self.passwd = passwd

        self.ssl = ssl

        self.tls = tls

        self.debug = debug

        self.auth = smtp_auth

    def send(self, recipients=[], subject='', body='', attachment_files=None):

        if isinstance(recipients, basestring):

            recipients = [recipients]

        if self.ssl:

            smtp_serv = smtplib.SMTP_SSL(self.mail_server, self.mail_port)

        else:

            smtp_serv = smtplib.SMTP(self.mail_server, self.mail_port)

        if self.tls:

            smtp_serv.ehlo()

            smtp_serv.starttls()

        if self.debug:

            smtp_serv.set_debuglevel(1)

        smtp_serv.ehlo()

        if self.auth:

            smtp_serv.esmtp_features["auth"] = self.auth

        #if server requires authorization you must provide login and password

        #but only if we have them

        if self.user and self.passwd:

            smtp_serv.login(self.user, self.passwd)

        date_ = formatdate(localtime=True)

        msg = MIMEMultipart()

        msg.set_type('multipart/alternative')

        msg.preamble = 'You will not see this in a MIME-aware mail reader.\n'

        text_msg = MIMEText(body)

        text_msg.set_type('text/plain')

        text_msg.set_param('charset', 'UTF-8')

        msg['From'] = self.mail_from

        msg['To'] = ','.join(recipients)

    def __atach_files(self, msg, attachment_files):

        if isinstance(attachment_files, dict):

            for f_name, msg_file in attachment_files.items():

                ctype, encoding = mimetypes.guess_type(f_name)

                logging.info("guessing file %s type based on %s", ctype,

                             f_name)

                if ctype is None or encoding is not None:

                    # No guess could be made, or the file is encoded

                    # (compressed), so use a generic bag-of-bits type.

                    ctype = 'application/octet-stream'

                maintype, subtype = ctype.split('/', 1)

                if maintype == 'text':

                    # Note: we should handle calculating the charset

                    file_part = MIMEText(self.get_content(msg_file),

                                         _subtype=subtype)

                elif maintype == 'image':

                    file_part = MIMEImage(self.get_content(msg_file),

                                          _subtype=subtype)

                elif maintype == 'audio':

                    file_part = MIMEAudio(self.get_content(msg_file),

                                          _subtype=subtype)

                else:

                    file_part = MIMEBase(maintype, subtype)

                    file_part.set_payload(self.get_content(msg_file))

                    # Encode the payload using Base64

                    encoders.encode_base64(msg)

                # Set the filename parameter

                file_part.add_header('Content-Disposition', 'attachment',

                                     filename=f_name)

                file_part.add_header('Content-Type', ctype, name=f_name)

                msg.attach(file_part)

        else:

            raise Exception('Attachment files should be'

                            'a dict in format {"filename":"filepath"}')

    def get_content(self, msg_file):

        """Get content based on type, if content is a string do open first

        else just read because it's a probably open file object

        :param msg_file:

        """

        if isinstance(msg_file, str):

            return open(msg_file, "rb").read()

        else:

            #just for safe seek to 0

            msg_file.seek(0)

            return msg_file.read()