import { FileEntry } from '#base_modules/FileManager/types/entries'

const PREVIEWABLE_TEXT_EXTENSIONS = ['txt', 'md', 'log', 'json', 'csv']

export default class FilePreviewService {
  public async withPreview(
    entry: FileEntry,
    getContent: () => Promise<string>
  ): Promise<FileEntry & { content?: string }> {
    if (!this.isPreviewableTextFile(entry.name)) return entry

    const content = await getContent()

    return { ...entry, content }
  }

  private isPreviewableTextFile(name: string): boolean {
    const fileExt = name.split('.').pop()?.toLowerCase()

    return PREVIEWABLE_TEXT_EXTENSIONS.includes(fileExt as string)
  }
}