import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
import ssl
import humanfriendly

def send_email(event, next_alert, next_event, config):
    # Set up the SMTP server details
    smtp_server = config["email"]["smtp_server"]
    port = config["email"]["port"]
    sender_email = config["email"]["username"]
    receiver_email = config["email"]["recipient"]
    password = config["email"]["password"]
    
    # Event details
    event_name = event["summary"]
    event_description = event["description"]
    event_location = event["location"]
    event_date = next_event
    event_delta = next_event - next_alert
    total_seconds = event_delta.total_seconds()
    human_readable_time = humanfriendly.format_timespan(total_seconds)
    
    # Create a multipart message and set headers
    message = MIMEMultipart()
    message["From"] = sender_email
    message["To"] = receiver_email
    message["Subject"] = "Event Alert: '{}' @ {}".format(event_name, event_date)
    
    # Add body to email
    body = """\
    Hi,
    This is an event alert from remindme_caldav.

    Event details:
    ---------------------------------

        Event name: {}
        Date/time: {}
        Description: {}
        Location: {}
        Time until event: {}

    ---------------------------------
    """.format(event_name, event_date, event_description, event_location, human_readable_time)
    message.attach(MIMEText(body, "plain"))
    text = message.as_string()
    
    try:
        # Create a secure SSL context and connect to the server
        context = ssl.create_default_context()
        with smtplib.SMTP(smtp_server, port) as server:  # Use 'with' statement for automatic cleanup
            server.ehlo()  # Can be omitted
            server.starttls(context=context)   # Secure the connection
            server.login(sender_email, password)
            
            # Send email here
            server.sendmail(sender_email, receiver_email, text)
            print("Message sent via email")
            return
    except Exception as e:
        # Print any error messages to stdout
        print("An error occured when sending alert via email, please check your config. Message: {}".format(e))