export interface AttachmentAudioMeta {
  title: string | null
  artist: string | null
  album: string | null
  voice?: boolean
}

export interface CommentAttachment {
  id: number
  name: string
  url: string
  mimeType: string | null
  size: number | null
  cover?: string | null
  meta?: AttachmentAudioMeta | null
}

export const MAX_COMMENT_ATTACHMENTS = 8
export const MAX_ATTACHMENT_SIZE = 200 * 1024 * 1024 // 200 MB

export function isImageAttachment(a: { mimeType?: string | null, name?: string }): boolean {
  return !!a.mimeType?.startsWith('image/')
    || (!!a.name && /\.(avif|bmp|gif|jpe?g|png|svg|webp)$/i.test(a.name))
}

export function isAudioAttachment(a: { mimeType?: string | null, name?: string }): boolean {
  return !!a.mimeType?.startsWith('audio/')
    || (!!a.name && /\.(mp3|flac|ogg|wav|m4a|aac|opus)$/i.test(a.name))
}

export function isVideoAttachment(a: { mimeType?: string | null, name?: string }): boolean {
  return !!a.mimeType?.startsWith('video/')
    || (!!a.name && /\.(mp4|webm|mov|mkv|avi|m4v|mpg|mpeg|ts|mts)$/i.test(a.name))
}

export function isVoiceAttachment(a: { meta?: { voice?: boolean } | null }): boolean {
  return a.meta?.voice === true
}

export function formatFileSize(bytes: number | null | undefined): string {
  if (!bytes || bytes <= 0) return ''
  return bytes >= 1024 * 1024
    ? `${(bytes / 1024 / 1024).toFixed(1)} MB`
    : `${Math.max(1, Math.round(bytes / 1024))} KB`
}