import { getTransporter, emailConfigured, FROM_EMAIL, APP_NAME } from "./client"
import {
  BRAND,
  emailShell,
  detailTable,
  statusBadge,
  paragraph,
  escapeHtml,
  htmlToText,
} from "./layout"

// Re-exported so existing importers (`@/lib/email/send`) keep working.
export { escapeHtml }

interface SendEmailOptions {
  to: string
  subject: string
  html: string
  /** Optional plain-text part. Auto-derived from `html` when omitted. */
  text?: string
  from?: string
}

export async function sendEmail({ to, subject, html, text, from }: SendEmailOptions) {
  if (!emailConfigured()) {
    console.warn(`[email] SMTP not configured — skipping "${subject}" to ${to}`)
    return { success: false, error: "email not configured" }
  }

  try {
    const info = await getTransporter().sendMail({
      from: from ?? `${APP_NAME} <${FROM_EMAIL}>`,
      to,
      subject,
      html,
      // A plain-text alternative improves inbox placement and gives clients
      // that can't render HTML something clean to show.
      text: text ?? htmlToText(html),
    })
    return { success: true, id: info.messageId }
  } catch (error) {
    console.error("Email send failed:", error)
    return { success: false, error }
  }
}

// ── Email templates ──────────────────────────────────────────────

export function rentDueReminderHtml({
  tenantName,
  propertyName,
  unitNumber,
  amount,
  dueDate,
  paymentLink,
}: {
  tenantName: string
  propertyName: string
  unitNumber: string
  amount: string
  dueDate: string
  paymentLink?: string
}) {
  return emailShell({
    preheader: `Your rent of ${amount} is due on ${dueDate}.`,
    eyebrow: "Rent reminder",
    accent: BRAND.indigo,
    title: "Your rent is due soon",
    intro: `Hi ${escapeHtml(tenantName)}, this is a friendly reminder about your upcoming rent payment.`,
    body: detailTable([
      { label: "Property", value: `${propertyName} — Unit ${unitNumber}` },
      { label: "Amount due", value: amount, accent: true },
      { label: "Due date", value: dueDate },
    ]),
    button: paymentLink ? { href: paymentLink, label: "Pay rent now" } : undefined,
    footerNote: paymentLink
      ? "If the button doesn't work, contact your landlord for alternative payment options."
      : "Please arrange payment before the due date. Reach out to your landlord with any questions.",
  })
}

export function rentOverdueHtml({
  tenantName,
  propertyName,
  unitNumber,
  amount,
  dueDate,
}: {
  tenantName: string
  propertyName: string
  unitNumber: string
  amount: string
  dueDate: string
}) {
  return emailShell({
    preheader: `Your rent payment of ${amount} is now overdue.`,
    eyebrow: "Action needed",
    accent: BRAND.red,
    title: "Your rent is overdue",
    intro: `Hi ${escapeHtml(tenantName)}, our records show the payment below hasn't been received yet.`,
    body:
      detailTable(
        [
          { label: "Property", value: `${propertyName} — Unit ${unitNumber}` },
          { label: "Amount due", value: amount, accent: true },
          { label: "Was due", value: dueDate, accent: true },
        ],
        BRAND.red
      ) +
      paragraph(
        "Please make payment as soon as possible to avoid any late fees. If you've already paid, you can disregard this notice."
      ),
  })
}

export function leaseExpiryHtml({
  tenantName,
  propertyName,
  unitNumber,
  leaseEnd,
  daysLeft,
}: {
  tenantName: string
  propertyName: string
  unitNumber: string
  leaseEnd: string
  daysLeft: number
}) {
  return emailShell({
    preheader: `Your lease ends on ${leaseEnd} (${daysLeft} days away).`,
    eyebrow: "Lease update",
    accent: BRAND.amber,
    title: "Your lease is expiring soon",
    intro: `Hi ${escapeHtml(tenantName)}, your current lease is coming to an end.`,
    body:
      detailTable(
        [
          { label: "Property", value: `${propertyName} — Unit ${unitNumber}` },
          { label: "Lease ends", value: leaseEnd, accent: true },
          { label: "Time remaining", value: `${daysLeft} days` },
        ],
        BRAND.amber
      ) + paragraph("Please contact your landlord to discuss renewal options or next steps."),
  })
}

export function maintenanceUpdateHtml({
  tenantName,
  title,
  status,
  resolutionNotes,
}: {
  tenantName: string
  title: string
  status: string
  resolutionNotes?: string
}) {
  const prettyStatus = status.replace(/_/g, " ")
  const fontStack =
    "-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif"
  return emailShell({
    preheader: `Your maintenance request is now "${prettyStatus}".`,
    eyebrow: "Maintenance",
    accent: BRAND.indigo,
    title: "Update on your maintenance request",
    intro: `Hi ${escapeHtml(tenantName)}, there's an update on your request.`,
    body:
      `<table role="presentation" width="100%" cellspacing="0" cellpadding="0" border="0" style="margin:8px 0 20px;background:${BRAND.panel};border:1px solid ${BRAND.line};border-radius:12px;">
                <tr><td style="padding:18px 22px;">
                  <p style="margin:0 0 12px;font-family:${fontStack};font-size:15px;font-weight:600;color:${BRAND.ink};">${escapeHtml(title)}</p>
                  ${statusBadge(prettyStatus, BRAND.indigo)}
                </td></tr>
              </table>` +
      (resolutionNotes ? paragraph(escapeHtml(resolutionNotes), { muted: true }) : ""),
  })
}

export function resetPasswordHtml(url: string) {
  return emailShell({
    preheader: "Reset your Property Management Network password.",
    eyebrow: "Security",
    title: "Reset your password",
    intro:
      "We received a request to reset your password. Click the button below to choose a new one — this link will expire shortly for your security.",
    button: { href: url, label: "Reset password" },
    footerNote:
      "If you didn't request a password reset, you can safely ignore this email — your password won't change.",
  })
}

export function verifyEmailHtml(url: string) {
  return emailShell({
    preheader: "Confirm your email to finish setting up your account.",
    eyebrow: "Welcome",
    title: "Verify your email address",
    intro:
      "Thanks for signing up! Please confirm your email address to finish setting up your account.",
    button: { href: url, label: "Verify email" },
    footerNote: "If you didn't create an account, you can safely ignore this email.",
  })
}

export function teamInviteHtml({
  inviterName,
  inviteUrl,
  role,
}: {
  inviterName: string
  inviteUrl: string
  role: "member" | "viewer"
}) {
  const roleLabel = role === "viewer" ? "view" : "manage"
  return emailShell({
    preheader: `${inviterName} invited you to their property portfolio.`,
    eyebrow: "Team invitation",
    title: "You've been invited to a team",
    intro: `<strong style="color:${BRAND.ink};">${escapeHtml(inviterName)}</strong> has invited you to ${escapeHtml(roleLabel)} their property portfolio on ${escapeHtml(APP_NAME)}.`,
    button: { href: inviteUrl, label: "Accept invitation" },
    footerNote:
      "If you don't have an account yet, you'll be asked to sign in or sign up first.",
  })
}

export function accountDeletionRequestedHtml({
  name,
  scheduledDate,
  graceDays,
}: {
  name: string
  scheduledDate: string
  graceDays: number
}) {
  return emailShell({
    preheader: `Your account is scheduled for permanent deletion on ${scheduledDate}.`,
    eyebrow: "Account deletion",
    accent: BRAND.red,
    title: "Your account deletion is scheduled",
    intro: `Hi ${escapeHtml(name)}, we received your request to delete your account and all associated data.`,
    body:
      detailTable(
        [
          { label: "Deletion date", value: scheduledDate, accent: true },
          { label: "Grace period", value: `${graceDays} days` },
        ],
        BRAND.red
      ) +
      paragraph(
        "Until then your account stays fully usable, and you can cancel the deletion at any time from Settings → Privacy & Data. After the deletion date, ALL your properties, tenants, payments, documents, and uploaded files are permanently erased — this cannot be undone."
      ),
    footerNote:
      "If you did not request this, sign in and cancel the deletion immediately, then change your password.",
  })
}

export function accountDeletionCompletedHtml() {
  return emailShell({
    preheader: "Your account and personal data have been permanently deleted.",
    eyebrow: "Account deletion",
    title: "Your account has been deleted",
    intro:
      "As requested, your account and the personal data associated with it have been permanently deleted from our systems.",
    body: paragraph(
      "Financial records we are legally required to retain (for example, invoices held by our payment processor) are kept only for as long as the law requires. Everything else — your properties, tenants, documents, and uploaded files — is gone."
    ),
    footerNote: "Thanks for having used Property Management Network. You're welcome back anytime.",
  })
}

export function followUpHtml(message: string) {
  return emailShell({
    preheader: message.slice(0, 140),
    accent: BRAND.indigo,
    title: "A quick note from your landlord",
    body: paragraph(escapeHtml(message).replace(/\n/g, "<br/>")),
    footerNote: "Sent automatically by your landlord's follow-up system.",
  })
}

export function paymentLinkHtml({
  tenantName,
  amount,
  dueDate,
  propertyLabel,
  senderName,
  paymentLink,
}: {
  tenantName: string
  amount: string
  dueDate: string
  propertyLabel: string
  senderName: string
  paymentLink?: string
}) {
  return emailShell({
    preheader: `Rent payment of ${amount} due ${dueDate}.`,
    eyebrow: "Rent payment",
    accent: BRAND.indigo,
    title: "Your rent payment is due",
    intro: `Hi ${escapeHtml(tenantName)}, here are the details for your upcoming rent payment.`,
    body: detailTable([
      { label: "Property", value: propertyLabel },
      { label: "Amount due", value: amount, accent: true },
      { label: "Due date", value: dueDate },
    ]),
    button: paymentLink ? { href: paymentLink, label: "Pay rent now" } : undefined,
    footerNote: `Sent by ${escapeHtml(senderName)} via ${escapeHtml(APP_NAME)}.`,
  })
}