"""Email sending service via SMTP.

If SMTP credentials are not configured (SMTP_HOST / SMTP_USER empty),
emails are logged to console instead — useful for local development.

Supabase SMTP settings can be found in:
  Project Settings → Auth → SMTP Settings (enable custom SMTP)

Or use any external provider (SendGrid, Mailgun, Brevo, etc.) and put
the credentials in the .env file.
"""

from __future__ import annotations

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

from app.core.config import get_settings

logger = logging.getLogger(__name__)


class EmailService:
    def __init__(self):
        self.settings = get_settings()

    def _is_configured(self) -> bool:
        return bool(self.settings.SMTP_HOST and self.settings.SMTP_USER)

    def _send(self, to: str, subject: str, html_body: str, text_body: str) -> None:
        s = self.settings
        msg = MIMEMultipart("alternative")
        msg["Subject"] = subject
        msg["From"] = s.EMAIL_FROM
        msg["To"] = to
        msg.attach(MIMEText(text_body, "plain", "utf-8"))
        msg.attach(MIMEText(html_body, "html", "utf-8"))

        ctx = ssl.create_default_context()
        try:
            if s.SMTP_PORT == 465:
                with smtplib.SMTP_SSL(s.SMTP_HOST, s.SMTP_PORT, context=ctx) as srv:
                    srv.login(s.SMTP_USER, s.SMTP_PASSWORD)
                    srv.sendmail(s.EMAIL_FROM, to, msg.as_string())
            else:
                with smtplib.SMTP(s.SMTP_HOST, s.SMTP_PORT) as srv:
                    srv.ehlo()
                    srv.starttls(context=ctx)
                    srv.login(s.SMTP_USER, s.SMTP_PASSWORD)
                    srv.sendmail(s.EMAIL_FROM, to, msg.as_string())
        except Exception as exc:
            logger.error("Failed to send email to %s: %s", to, exc)
            raise

    # ── Public send methods ───────────────────────────────────

    def send_password_reset_email(self, to_email: str, reset_url: str) -> None:
        subject = f"Reset your {self.settings.APP_NAME} password"
        html = f"""
        <div style="font-family:Arial,sans-serif;max-width:600px;margin:0 auto;padding:24px;color:#1e293b">
          <h2 style="color:#0f4c75">Reset Your Password</h2>
          <p>You requested a password reset for your {self.settings.APP_NAME} account.</p>
          <p>Click the button below. This link expires in <strong>1 hour</strong>.</p>
          <p style="margin:24px 0">
            <a href="{reset_url}"
               style="background:#0ea5b5;color:#fff;padding:12px 24px;border-radius:6px;
                      text-decoration:none;font-weight:bold">
              Reset Password
            </a>
          </p>
          <p style="color:#64748b;font-size:13px">
            If you did not request this, you can safely ignore this email.
          </p>
          <p style="color:#94a3b8;font-size:12px">Or paste this link: {reset_url}</p>
        </div>
        """
        text = f"Reset your password at: {reset_url}\n\nThis link expires in 1 hour."

        if self._is_configured():
            self._send(to_email, subject, html, text)
        else:
            logger.info("[DEV] Password reset email → %s  URL: %s", to_email, reset_url)

    def send_verification_email(self, to_email: str, verify_url: str, name: str) -> None:
        subject = f"Verify your {self.settings.APP_NAME} email address"
        html = f"""
        <div style="font-family:Arial,sans-serif;max-width:600px;margin:0 auto;padding:24px;color:#1e293b">
          <h2 style="color:#0f4c75">Welcome, {name}!</h2>
          <p>Thanks for signing up. Please verify your email address to activate your account.</p>
          <p style="margin:24px 0">
            <a href="{verify_url}"
               style="background:#0ea5b5;color:#fff;padding:12px 24px;border-radius:6px;
                      text-decoration:none;font-weight:bold">
              Verify Email
            </a>
          </p>
          <p style="color:#64748b;font-size:13px">
            This link expires in 24 hours. If you did not sign up, ignore this email.
          </p>
          <p style="color:#94a3b8;font-size:12px">Or paste this link: {verify_url}</p>
        </div>
        """
        text = f"Hi {name},\n\nVerify your {self.settings.APP_NAME} account: {verify_url}\n\nExpires in 24 hours."

        if self._is_configured():
            self._send(to_email, subject, html, text)
        else:
            logger.info("[DEV] Verification email → %s  URL: %s", to_email, verify_url)

    def send_new_message_notification(
        self, to_email: str, agency_name: str, sender_name: str, listing_title: str, dashboard_url: str
    ) -> None:
        subject = f"New message from {sender_name} — {self.settings.APP_NAME}"
        html = f"""
        <div style="font-family:Arial,sans-serif;max-width:600px;margin:0 auto;padding:24px;color:#1e293b">
          <h2 style="color:#0f4c75">New Message Received</h2>
          <p>Hi <strong>{agency_name}</strong>,</p>
          <p><strong>{sender_name}</strong> sent you a message about your listing
             <em>"{listing_title}"</em>.</p>
          <p style="margin:24px 0">
            <a href="{dashboard_url}"
               style="background:#0ea5b5;color:#fff;padding:12px 24px;border-radius:6px;
                      text-decoration:none;font-weight:bold">
              View Message
            </a>
          </p>
          <p style="color:#94a3b8;font-size:12px">Or visit: {dashboard_url}</p>
        </div>
        """
        text = (
            f"Hi {agency_name},\n\n"
            f"{sender_name} sent a message about \"{listing_title}\".\n\n"
            f"View it at: {dashboard_url}"
        )
        if self._is_configured():
            self._send(to_email, subject, html, text)
        else:
            logger.info("[DEV] New message notification → %s  from: %s", to_email, sender_name)