export function telegramAttachment(content = {}) {
  const type = content['@type']
  if (type === 'messagePhoto') {
    const sizes = Array.isArray(content.photo?.sizes) ? content.photo.sizes : []
    const file = sizes.at(-1)?.photo
    return file?.id ? {
      telegramFileId: Number(file.id),
      attachmentName: `telegram-photo-${file.id}.jpg`,
      attachmentMimeType: 'image/jpeg',
      attachmentSize: Number(file.size || file.expected_size || 0),
    } : {}
  }
  if (type === 'messageDocument') {
    const document = content.document || {}
    const file = document.document
    return file?.id ? {
      telegramFileId: Number(file.id),
      attachmentName: document.file_name || `document-${file.id}`,
      attachmentMimeType: document.mime_type || 'application/octet-stream',
      attachmentSize: Number(file.size || file.expected_size || 0),
    } : {}
  }
  if (type === 'messageVoiceNote') {
    const file = content.voice_note?.voice
    return file?.id ? {
      telegramFileId: Number(file.id),
      attachmentName: `voice-${file.id}.ogg`,
      attachmentMimeType: content.voice_note?.mime_type || 'audio/ogg',
      attachmentSize: Number(file.size || file.expected_size || 0),
      duration: Number(content.voice_note?.duration || 0),
    } : {}
  }
  if (type === 'messageAudio') {
    const audio = content.audio || {}
    const file = audio.audio
    return file?.id ? {
      telegramFileId: Number(file.id),
      attachmentName: audio.file_name || audio.title || `audio-${file.id}`,
      attachmentMimeType: audio.mime_type || 'audio/mpeg',
      attachmentSize: Number(file.size || file.expected_size || 0),
      duration: Number(audio.duration || 0),
    } : {}
  }
  if (type === 'messageSticker') {
    const sticker = content.sticker || {}
    const file = sticker.sticker
    const format = sticker.format?.['@type']
    const extension = format === 'stickerFormatTgs' ? 'tgs' : format === 'stickerFormatWebm' ? 'webm' : 'webp'
    return file?.id ? {
      telegramFileId: Number(file.id),
      attachmentName: `sticker-${file.id}.${extension}`,
      attachmentMimeType: extension === 'webp' ? 'image/webp' : extension === 'webm' ? 'video/webm' : 'application/x-tgsticker',
      attachmentSize: Number(file.size || file.expected_size || 0),
      stickerEmoji: sticker.emoji || '',
    } : {}
  }
  return {}
}

export const dateKey = (value = Date.now()) => {
  const date = new Date(value)
  return Number.isNaN(date.getTime()) ? '' : date.toISOString().slice(0, 10)
}

export const percent = (numerator, denominator) =>
  denominator ? Math.round((numerator / denominator) * 1000) / 10 : 0

export const countBy = (list, key) => {
  const counts = new Map()
  for (const item of list) {
    const value = typeof key === 'function' ? key(item) : item[key]
    if (!value) continue
    counts.set(String(value), (counts.get(String(value)) || 0) + 1)
  }
  return counts
}