dre/backend/dreemail.py

"""Best-effort SMTP email via the germainebrown.com relay (mail.germainebrown.com:2525, STARTTLS).
Email failure must NEVER fail the API request — wrap every send in try/except, log, continue.
Per conductor decision #3.
"""
from __future__ import annotations

import logging
import os
import smtplib
import ssl
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

logger = logging.getLogger("dre.email")


def _env(name: str, default: str = "") -> str:
    return os.environ.get(name, default)


def _team_recipients() -> list[str]:
    """Fan-out list from DRE_TEAM_NOTIFY (comma-separated). Defaults to dre@."""
    raw = _env("DRE_TEAM_NOTIFY", "dre@debtrecoveryexperts.com")
    return [a.strip() for a in raw.split(",") if a.strip()]


def send_email(to_addr: str, subject: str, body_text: str, html: str | None = None) -> bool:
    """Send an email via the configured SMTP relay. Returns True on success, False on failure.
    Never raises — caller proceeds regardless."""
    host = _env("DRE_SMTP_HOST", "mail.germainebrown.com")
    port = int(_env("DRE_SMTP_PORT", "2525"))
    user = _env("DRE_SMTP_USER", "")
    pw = _env("DRE_SMTP_PASS", "")
    sender = _env("DRE_SMTP_FROM", "dre@debtrecoveryexperts.com")
    try:
        msg = MIMEMultipart("alternative")
        msg["From"] = sender
        msg["To"] = to_addr
        msg["Subject"] = subject
        msg.attach(MIMEText(body_text, "plain", "utf-8"))
        if html:
            msg.attach(MIMEText(html, "html", "utf-8"))
        with smtplib.SMTP(host, port, timeout=15) as server:
            server.starttls(context=ssl.create_default_context())
            if user and pw:
                server.login(user, pw)
            server.sendmail(sender, [to_addr], msg.as_string())
        return True
    except Exception as exc:  # noqa: BLE001 — best-effort
        logger.error("email send failed to=%s subject=%s err=%s", to_addr, subject, exc)
        return False


def notify_team_intake(claim_number: str, client_number: str, company_name: str,
                       amount_cents: int, debtor_name: str) -> bool:
    team = _team_recipients()
    base = _env("DRE_BASE_URL", "https://my.debtrecoveryexperts.com")
    dollars = amount_cents / 100.0
    body = (
        f"New claim submitted via portal.\n\n"
        f"Claim: {claim_number}\n"
        f"Client: {client_number} — {company_name}\n"
        f"Debtor: {debtor_name}\n"
        f"Amount: ${dollars:,.2f}\n\n"
        f"Review at: {base}/\n"
    )
    html = (
        f"<h2>New claim submitted</h2>"
        f"<p><b>Claim:</b> {claim_number}<br>"
        f"<b>Client:</b> {client_number} — {company_name}<br>"
        f"<b>Debtor:</b> {debtor_name}<br>"
        f"<b>Amount:</b> ${dollars:,.2f}</p>"
        f"<p><a href=\"{base}/\">Review in portal</a></p>"
    )
    ok = True
    for addr in team:
        ok = send_email(addr, f"New DRE Claim: {claim_number}", body, html) and ok
    return ok


def send_magic_link(to_addr: str, raw_token: str, client_number: str) -> bool:
    base = _env("DRE_BASE_URL", "https://my.debtrecoveryexperts.com")
    link = f"{base}/verify?token={raw_token}"
    body = (
        f"Hello,\n\n"
        f"Click the link below to log in to your DRE client portal. "
        f"This link expires in 15 minutes and can only be used once.\n\n"
        f"{link}\n\n"
        f"If you did not request this link, you can ignore this email.\n"
    )
    html = (
        f"<p>Hello,</p>"
        f"<p>Click the button below to log in to your DRE client portal. "
        f"This link expires in 15 minutes and can only be used once.</p>"
        f"<p><a href=\"{link}\" style=\"...\">Log In</a></p>"
        f"<p>If the button doesn't work, copy this link: {link}</p>"
        f"<p>If you did not request this link, you can ignore this email.</p>"
    )
    return send_email(to_addr, "Your DRE Portal Login Link", body, html)


def notify_team_message(claim_number: str, subject: str, content: str,
                        author: str) -> bool:
    team = _team_recipients()
    body = (
        f"New client message on claim {claim_number}.\n\n"
        f"From: {author}\n"
        f"Subject: {subject}\n\n"
        f"{content}\n"
    )
    ok = True
    for addr in team:
        ok = send_email(addr, f"Client message on {claim_number}: {subject}", body) and ok
    return ok