"""Notifiche: email SMTP + WhatsApp via gateway XAB."""
import smtplib
import logging
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from datetime import datetime
import httpx
from app.config import get_settings

log = logging.getLogger(__name__)
settings = get_settings()


async def send_wa_message(phone: str, text: str) -> bool:
    """Invia messaggio WhatsApp via gateway XAB su APP:18800."""
    if not settings.wa_enabled:
        log.info(f"WA disabled, skip: {phone}")
        return False
    try:
        # Normalizza numero: +39 3xx -> 39 3xx
        clean = phone.replace("+", "").replace(" ", "").replace("-", "")
        if not clean.startswith("39"):
            clean = "39" + clean

        async with httpx.AsyncClient(timeout=10) as client:
            r = await client.post(
                settings.wa_gateway_url,
                json={"to": clean, "text": text},
            )
            if r.status_code == 200:
                log.info(f"WA sent to {clean}")
                return True
            else:
                log.error(f"WA error {r.status_code}: {r.text}")
                return False
    except Exception as e:
        log.error(f"WA exception: {e}")
        return False


def send_email(to: str, subject: str, html_body: str) -> bool:
    """Invia email via SMTP."""
    if not settings.smtp_user:
        log.info(f"SMTP not configured, skip: {to}")
        return False
    try:
        msg = MIMEMultipart("alternative")
        msg["Subject"] = subject
        msg["From"] = settings.smtp_from
        msg["To"] = to
        msg.attach(MIMEText(html_body, "html"))

        with smtplib.SMTP(settings.smtp_host, settings.smtp_port) as server:
            server.starttls()
            server.login(settings.smtp_user, settings.smtp_pass)
            server.sendmail(settings.smtp_from, to, msg.as_string())
        log.info(f"Email sent to {to}")
        return True
    except Exception as e:
        log.error(f"Email exception: {e}")
        return False


async def notify_booking_confirmed(booking, service_name: str, provider_name: str):
    """Notifica al cliente: conferma prenotazione."""
    dt = booking.start_at.strftime("%d/%m/%Y alle %H:%M")
    # WhatsApp al cliente
    wa_text = (
        f"✅ Prenotazione confermata!\n\n"
        f"Servizio: {service_name}\n"
        f"Data: {dt}\n"
        f"Operatore: {provider_name}\n\n"
        f"Farmacia Ianni - Via Cassia 940, Roma\n"
        f"Per cancellare, rispondi CANCELLA."
    )
    await send_wa_message(booking.customer_phone, wa_text)

    # Email se fornita
    if booking.customer_email:
        html = f"""
        <h2>Prenotazione confermata</h2>
        <p><strong>Servizio:</strong> {service_name}</p>
        <p><strong>Data:</strong> {dt}</p>
        <p><strong>Operatore:</strong> {provider_name}</p>
        <hr>
        <p>Farmacia Ianni - Via Cassia 940, Roma</p>
        """
        send_email(booking.customer_email, f"Prenotazione {service_name} - {dt}", html)


async def notify_operator(booking, service_name: str, provider_email: str):
    """Notifica all'operatore: nuova prenotazione."""
    dt = booking.start_at.strftime("%d/%m/%Y alle %H:%M")
    html = f"""
    <h2>Nuova prenotazione</h2>
    <p><strong>Cliente:</strong> {booking.customer_name}</p>
    <p><strong>Telefono:</strong> {booking.customer_phone}</p>
    <p><strong>Servizio:</strong> {service_name}</p>
    <p><strong>Data:</strong> {dt}</p>
    """
    if provider_email:
        send_email(provider_email, f"Nuova prenotazione: {booking.customer_name} - {dt}", html)


async def send_reminder(booking, service_name: str):
    """Reminder 24h prima via WhatsApp."""
    dt = booking.start_at.strftime("%d/%m/%Y alle %H:%M")
    text = (
        f"📅 Promemoria: domani hai un appuntamento\n\n"
        f"Servizio: {service_name}\n"
        f"Data: {dt}\n\n"
        f"Farmacia Ianni - Via Cassia 940, Roma"
    )
    await send_wa_message(booking.customer_phone, text)