import fs from 'fs'
import path from 'path'

export const HIDDEN_FILES = /^\./

/** Video extensions for dedicated media libraries (movies, TV). */
export const VIDEO_EXTENSIONS = new Set(['.mkv', '.mp4', '.avi', '.mov', '.m4v', '.wmv', '.ts', '.m2ts'])

export function fileApiUrl(libraryId: string, relativePath: string): string {
  return `/api/file?libraryId=${encodeURIComponent(libraryId)}&path=${encodeURIComponent(relativePath)}`
}

export function thumbnailApiUrl(libraryId: string, relativePath: string): string {
  return `/api/thumbnail?libraryId=${encodeURIComponent(libraryId)}&path=${encodeURIComponent(relativePath)}`
}

/**
 * Finds the first non-hidden file in a directory whose basename (without extension)
 * matches the given pattern (case-insensitive).
 */
export function findFile(dir: string, pattern: RegExp): string | null {
  let entries: string[]
  try {
    entries = fs.readdirSync(dir)
  } catch {
    return null
  }
  return entries.find(
    (e) => !HIDDEN_FILES.test(e) && pattern.test(path.basename(e, path.extname(e)))
  ) ?? null
}