// Best-effort Telegram notification — a failed send never blocks the form
// submission it's attached to (the message is already saved in the DB by
// the time this runs; Telegram is a convenience notification, not the
// source of truth).
export async function sendTelegramMessage(text: string): Promise<void> {
  const token = process.env.TELEGRAM_BOT_TOKEN
  const chatId = process.env.TELEGRAM_CHAT_ID
  if (!token || !chatId) return

  try {
    const res = await fetch(`https://api.telegram.org/bot${token}/sendMessage`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ chat_id: chatId, text, disable_web_page_preview: true }),
    })
    if (!res.ok) {
      console.error('Telegram notification failed:', res.status, await res.text())
    }
  } catch (e) {
    console.error('Telegram notification error:', e)
  }
}

function formatIstanbulDate(date: Date): string {
  return new Intl.DateTimeFormat('tr-TR', {
    timeZone: 'Europe/Istanbul',
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
    hour12: false,
  }).format(date)
}

export function formatContactMessageNotification(params: {
  name: string
  email: string
  subject: string
  message: string
  ip: string
}): string {
  return [
    '⚡ [Marmaris Local] Yeni İletişim Talebi',
    '',
    '📍 Kaynak: marmarislocal.com / İletişim Formu',
    `👤 Ad Soyad: ${params.name}`,
    `📧 E-posta: ${params.email}`,
    `📋 Konu: ${params.subject}`,
    `🌐 IP Adresi: ${params.ip}`,
    `⏰ Tarih: ${formatIstanbulDate(new Date())}`,
    '',
    '📝 Mesaj:',
    params.message,
  ].join('\n')
}

export function formatBusinessSubmissionNotification(params: {
  businessName: string
  categoryName: string
  neighborhoodName: string
  address: string
  phone?: string | null
  whatsapp?: string | null
  description: string
  contactName: string
  contactEmail: string
  ip: string
}): string {
  return [
    '🏢 [Marmaris Local] Yeni İşletme Başvurusu',
    '',
    '📍 Kaynak: marmarislocal.com / İşletme Ekle Formu',
    `🏷️ İşletme Adı: ${params.businessName}`,
    `📂 Kategori: ${params.categoryName}`,
    `📌 Mahalle: ${params.neighborhoodName}`,
    `🏠 Adres: ${params.address}`,
    ...(params.phone ? [`☎️ Telefon: ${params.phone}`] : []),
    ...(params.whatsapp ? [`💬 WhatsApp: ${params.whatsapp}`] : []),
    `👤 Başvuran: ${params.contactName}`,
    `📧 E-posta: ${params.contactEmail}`,
    `🌐 IP Adresi: ${params.ip}`,
    `⏰ Tarih: ${formatIstanbulDate(new Date())}`,
    '',
    '📝 Açıklama:',
    params.description,
    '',
    'Onaylamak için admin panel → Başvurular.',
  ].join('\n')
}