"""
Email configuration parser and utilities.
Parses EMAIL_CONFIG environment variable in format:
smtp://<user>@kitsunehosting.net:<password>@smtp.forwardemail.net:465
"""

import os
import re
from urllib.parse import urlparse, unquote


def parse_email_config(email_config_str):
    """
    Parse EMAIL_CONFIG string into email settings.

    Format: smtp://<user>@kitsunehosting.net:<password>@smtp.forwardemail.net:465

    Returns dict with: user, password, host, port, from_email
    """
    if not email_config_str:
        return None

    # Parse the URL
    # Format: smtp://user@domain:password@host:port
    # We need to handle the @ symbols carefully
    match = re.match(r"smtp://([^:]+):([^@]+)@([^:]+):(\d+)", email_config_str)
    if not match:
        raise ValueError(f"Invalid EMAIL_CONFIG format: {email_config_str}")

    user_with_domain = match.group(1)
    password = unquote(match.group(2))
    host = match.group(3)
    port = int(match.group(4))

    # Extract email address (user@domain)
    from_email = user_with_domain

    return {
        "user": user_with_domain,
        "password": password,
        "host": host,
        "port": port,
        "from_email": from_email,
    }


def get_email_config():
    """Get email configuration from environment."""
    email_config_str = os.environ.get("EMAIL_CONFIG")
    if not email_config_str:
        return None
    return parse_email_config(email_config_str)