"""
Module for sending emails
"""
import os

from email import encoders
from email.mime.text import MIMEText
from email.mime.base import MIMEBase
from email.mime.multipart import MIMEMultipart

import types
import smtplib


SUPPORTED_TEXT_ATTACHMENTS = ['xml', 'ulog', 'txt', 'ms', 'py', 'ini']
SUPPORTED_IMAGE_ATTACHMENTS = ['png', 'tga', 'jpg', 'bmp']
SUPPORTED_ATTACHMENTS = SUPPORTED_TEXT_ATTACHMENTS + SUPPORTED_IMAGE_ATTACHMENTS


def Send(emailFrom, emailTo, emailSubject, emailBody, asHtml=False, attachments=[], exchangeServer=None):
    """
    Sends an email using the exchange server found in the project module.

    Arguments:
        emailFrom (string): email address of the sender
        emailTo (list): list of email addresses to send email to
        emailSubject (string): the subject/title of the email
        emailBody (string): the content of the email
        asHtml (boolean): add the content of the email as html
        attachments (list): list of paths to files to attach
        exchangeServer (string): server to use for sending the email
    """

    if not isinstance(emailTo, (types.ListType, types.TupleType)):
        emailTo = [emailTo]

    message = MIMEMultipart('alternative')
    message['Subject'] = '{0}'.format(emailSubject)
    message['To'] = ";".join(emailTo)
    message['From'] = emailFrom

    body = MIMEText(emailBody, ('plain', 'html')[asHtml])

    message.attach(body)
    
    for attachment in attachments:
        if not os.path.isfile(attachment):
            print 'Could not attach file ({0}) because it does not exist!'.format(attachment)
            continue

        fileType = os.path.splitext(attachment)[-1][1:].lower()
        if fileType in SUPPORTED_ATTACHMENTS:

            isImage = fileType in SUPPORTED_IMAGE_ATTACHMENTS

            part = MIMEBase('application', 'octet-stream')
            with open(attachment, 'rb'[:isImage + 1]) as attachmentFile:
                part.set_payload(attachmentFile.read())
            encoders.encode_base64(part)
            part.add_header('Content-Disposition', 'attachment; filename={0}'.format(os.path.basename(attachment)))
            message.attach(part)

            continue

        print ('The attachment file type ({0}) is not supported! '
               ' You will need to add the file type as a supported type to this module.'.format(fileType))
    
    try:
        if not exchangeServer:
            from RS import Config
            exchangeServer = Config.User.ExchangeServer

        server = smtplib.SMTP(exchangeServer)
        server.sendmail(emailFrom, emailTo, message.as_string())
        server.quit()
        
    except:
        print 'Could not send the email!'