import os
import smtplib
from email.mime.text import MIMEText


def is_configured() -> bool:
    return bool(os.environ.get("SMTP_HOST", "").strip())


def send_email(to: str, subject: str, body: str) -> bool:
    host = os.environ.get("SMTP_HOST", "").strip()
    if not host or not to:
        return False
    port = int(os.environ.get("SMTP_PORT", "587") or 587)
    user = os.environ.get("SMTP_USER", "").strip()
    pwd = os.environ.get("SMTP_PASSWORD", "")
    sender = os.environ.get("SMTP_FROM") or user or "no-reply@mailshift.com"
    try:
        msg = MIMEText(body, "plain", "utf-8")
        msg["Subject"] = subject
        msg["From"] = sender
        msg["To"] = to
        with smtplib.SMTP(host, port, timeout=15) as s:
            try:
                s.starttls()
            except Exception:
                pass
            if user:
                s.login(user, pwd)
            s.sendmail(sender, [to], msg.as_string())
        return True
    except Exception:
        return False