'''
This program is the emailing system
'''
import ssl
import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.mime.base import MIMEBase
from email import encoders
import settings


class Mail:
    ''' Sets up email and sends it. '''

    def __init__(self):
        self.email = settings.EMAIL
        self.password = settings.PASSWORD
        self.message = MIMEMultipart()

    def set_credentials(self, receiver_email: str, title: str):
        ''' Sets credentials for emailing the user. '''
        self.message['From'] = self.email
        self.message['To'] = receiver_email
        self.message['Subject'] = title
        self.message['Bcc'] = receiver_email

    def set_body_and_file(self, body: str, filename: str):
        ''' Sets the body and attaches files to the message. '''
        self.message.attach(MIMEText(body, 'plain'))
        self.message.attach(Mail.encode_file(filename))
        self.text = self.message.as_string()

    @staticmethod
    def encode_file(filename: str) -> MIMEBase:
        ''' Reads, encodes and attaches files to have them sent in the email'''
        with open(filename, 'rb') as attachment:
            part = MIMEBase('application', 'octet-stream')
            part.set_payload(attachment.read())
        encoders.encode_base64(part)
        part.add_header(
            'Content-Disposition',
            f'attachment; filename= {filename}'
        )
        return part

    def email_person(self, user_email: str):
        ''' Emails someone with a message '''
        port = 465
        context = ssl.create_default_context()
        with smtplib.SMTP_SSL('smtp.gmail.com', port, context=context) as server:
            server.login(self.email, self.password)
            server.sendmail(
                self.email,
                user_email,
                self.text
            )