import { join } from "node:path"
import type { Manual } from "@/lib/manuals-types"

type ThumbnailSanitizeOptions = {
  isLocalDevelopment: boolean
  thumbnailsRoot: string
  fileExists?: (path: string) => boolean
}

export function sanitizeManualThumbnailsForRuntime(
  manuals: Manual[],
  options: ThumbnailSanitizeOptions
): Manual[] {
  if (!options.isLocalDevelopment) {
    return manuals
  }

  const fileExists = options.fileExists ?? (() => false)

  return manuals.map((manual) => {
    if (!manual.thumbnailUrl || /^https?:\/\//i.test(manual.thumbnailUrl)) {
      return manual
    }

    const relativeThumbnailPath = manual.thumbnailUrl.includes("/thumbnails/")
      ? manual.thumbnailUrl.replace(/^.*\/thumbnails\//, "")
      : manual.thumbnailUrl

    return fileExists(join(options.thumbnailsRoot, relativeThumbnailPath))
      ? manual
      : { ...manual, thumbnailUrl: undefined }
  })
}