import type fs from 'node:fs'
import FSExtra from 'fs-extra'
import path from 'node:path'
import { createHash } from 'node:crypto'

export function tryStatSync(file: string): fs.Stats | undefined {
  try {
    // The "throwIfNoEntry" is a performance optimization for cases where the file does not exist
    return FSExtra.statSync(file, { throwIfNoEntry: false })
  } catch {}
}

export async function lookupFile(
  dir: string,
  fileNames: string[]
): Promise<string | undefined> {
  while (dir) {
    for (const fileName of fileNames) {
      const fullPath = path.join(dir, fileName)
      if (tryStatSync(fullPath)?.isFile()) return fullPath
    }
    const parentDir = path.dirname(dir)
    if (parentDir === dir) return

    dir = parentDir
  }
}

export function getHash(text: Buffer | string, length = 8): string {
  const h = createHash('sha256')
    .update(text as any)
    .digest('hex')
    .substring(0, length)
  if (length <= 64) return h
  return h.padEnd(length, '_')
}

export async function getFileHash(path: string) {
  const content = await FSExtra.readFile(path, 'utf-8')
  return getHash(content)
}