#!/usr/bin/env python3
"""
SMTP webhook server
"""

import os
import json
import smtplib
import sys
from email.header import Header
from email.mime.text import MIMEText

import cherrypy


class SMTPWebhookApp:
    """
    SMTP webhook server
    """

    def _send_mail(self):
        try:
            cl = cherrypy.request.headers['Content-Length']
            rawbody = cherrypy.request.body.read(int(cl))
            req_body = json.loads(rawbody)
            subject = req_body['subject']
            body = req_body['body']
            client = smtplib.SMTP(host=SMTP_SERVER_HOST, port=SMTP_SERVER_PORT)
            msg = MIMEText(body, 'plain', 'utf-8')
            msg['Subject'] = Header(subject, 'utf-8')
            msg['From'] = FROM_MAIL
            msg['To'] = TO_MAIL

            client.ehlo()
            client.starttls()
            client.ehlo()
            client.login(msg["From"], FROM_MAIL_PASSWORD)
            client.sendmail(msg['From'], msg['To'], msg.as_string())
            client.quit()
            return "mail sent successfully"
        except Exception as e:
            return "some error: {}".format(e)

    @cherrypy.expose
    def send_mail(self):
        """
        api endpoint for send mail
        """
        return self._send_mail()


ROOT = SMTPWebhookApp()

SMTP_SERVER_PORT = 587
CHERRYPY_SERVER_HOST = "0.0.0.0"
CHERRYPY_SERVER_PORT = 8081

if __name__ == "__main__":
    try:
        SMTP_SERVER_HOST = os.environ["smtp_server_host"]
        TO_MAIL = os.environ["to_mail"]
        FROM_MAIL = os.environ["from_mail"]
        FROM_MAIL_PASSWORD = os.environ["from_mail_password"]
    except KeyError:
        raise KeyError("Please check missing environment variables: to_mail, "
                       "from_mail, from_mail_password")

    cherrypy.server.socket_host = CHERRYPY_SERVER_HOST
    cherrypy.server.socket_port = CHERRYPY_SERVER_PORT
    ENGINE = cherrypy.engine

    cherrypy.tree.mount(ROOT, config={})

    try:
        ENGINE.start()
    except Exception:  # pylint: disable=broad-except
        sys.exit(1)
    else:
        ENGINE.block()