"""Notification helpers — ntfy and SMTP via Proton Bridge."""

import imaplib
import logging
import smtplib
import ssl
import urllib.request
from datetime import datetime
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from zoneinfo import ZoneInfo

log = logging.getLogger(__name__)

SMTP_HOST = "127.0.0.1"
SMTP_PORT = 1025
SMTP_USER = "admin@thevish.io"
SMTP_PASS = "REDACTED_PASSWORD"  # pragma: allowlist secret
DEFAULT_TO = "admin@thevish.io"

IMAP_HOST = "127.0.0.1"
IMAP_PORT = 1143
DIGEST_FOLDER = "Folders/Digests"


def send_ntfy(topic: str, title: str, message: str, priority: str = "default",
              base_url: str = "https://ntfy.sh"):
    """Send a push notification via ntfy."""
    url = f"{base_url.rstrip('/')}/{topic}"
    try:
        req = urllib.request.Request(url, data=message.encode(), headers={
            "Title": title,
            "Priority": priority,
            "Content-Type": "text/plain",
        })
        with urllib.request.urlopen(req, timeout=10):
            pass
        log.info("ntfy sent: %s", title)
    except Exception as e:
        log.warning("ntfy failed: %s", e)


def _file_to_digests(msg_bytes: bytes):
    """File a copy of the message into the Digests folder via Proton Bridge IMAP."""
    ctx = ssl.create_default_context()
    ctx.check_hostname = False
    ctx.verify_mode = ssl.CERT_NONE

    imap = imaplib.IMAP4(IMAP_HOST, IMAP_PORT)
    imap.starttls(ctx)
    imap.login(SMTP_USER, SMTP_PASS)

    status, folders = imap.list()
    folder_exists = any(DIGEST_FOLDER.encode() in f for f in (folders or []))
    if not folder_exists:
        imap.create(DIGEST_FOLDER)
        log.info("Created IMAP folder: %s", DIGEST_FOLDER)

    now = imaplib.Time2Internaldate(datetime.now(tz=ZoneInfo("UTC")))
    imap.append(DIGEST_FOLDER, None, now, msg_bytes)
    imap.logout()
    log.info("Filed message to %s folder", DIGEST_FOLDER)


def send_email(subject: str, html_body: str = "", text_body: str = "",
               to: str = DEFAULT_TO, from_addr: str = SMTP_USER):
    """Send email via Proton Bridge SMTP on localhost, then file into Digests folder."""
    msg = MIMEMultipart("alternative")
    msg["Subject"] = subject
    msg["From"] = from_addr
    msg["To"] = to
    msg["Date"] = datetime.now(tz=ZoneInfo("America/Los_Angeles")).strftime(
        "%a, %d %b %Y %H:%M:%S %z"
    )

    if text_body:
        msg.attach(MIMEText(text_body, "plain"))
    if html_body:
        msg.attach(MIMEText(html_body, "html"))

    ctx = ssl.create_default_context()
    ctx.check_hostname = False
    ctx.verify_mode = ssl.CERT_NONE

    with smtplib.SMTP(SMTP_HOST, SMTP_PORT) as server:
        server.starttls(context=ctx)
        server.login(SMTP_USER, SMTP_PASS)
        server.send_message(msg)

    log.info("Email sent: %s -> %s", subject, to)

    try:
        _file_to_digests(msg.as_bytes())
    except Exception as e:
        log.warning("Failed to file to Digests folder: %s", e)