import { existsSync, readFileSync, readdirSync, statSync } from 'node:fs'
import { extname, join, relative } from 'node:path'
import { fileURLToPath } from 'node:url'

const root = fileURLToPath(new URL('../', import.meta.url))
const textExtensions = new Set(['.css', '.html', '.js', '.json', '.md', '.mjs', '.ts', '.vue', '.yml', '.yaml'])
const textFileNames = new Set(['Dockerfile', 'nginx.conf', '.dockerignore', '.gitignore'])
const ignoredDirectories = new Set(['.git', 'dist', 'node_modules'])
const problems = []

function walk(directory) {
  for (const name of readdirSync(directory)) {
    if (ignoredDirectories.has(name)) continue
    const path = join(directory, name)
    const stats = statSync(path)
    if (stats.isDirectory()) {
      walk(path)
      continue
    }
    if (!textExtensions.has(extname(name)) && !textFileNames.has(name) && !name.startsWith('.env')) continue

    const text = readFileSync(path, 'utf8')
    const file = relative(root, path)
    if (/\r/.test(text)) problems.push(`${file}: use LF line endings`)
    text.split('\n').forEach((line, index) => {
      if (/[ \t]+$/.test(line)) problems.push(`${file}:${index + 1}: trailing whitespace`)
    })
  }
}

walk(root)

const config = JSON.parse(readFileSync(join(root, 'public/overlays/overlays.json'), 'utf8'))
if (!Array.isArray(config)) problems.push('public/overlays/overlays.json: expected an array')
const ids = new Set()
const files = new Set()
for (const [index, item] of (Array.isArray(config) ? config : []).entries()) {
  const id = typeof item?.id === 'string' ? item.id.trim() : ''
  const name = typeof item?.name === 'string' ? item.name.trim() : ''
  const file = typeof item?.file === 'string' ? item.file.trim() : ''
  if (!id || !name || !/^[A-Za-z0-9][A-Za-z0-9._ -]*\.(?:png|jpe?g|webp)$/i.test(file) || file.includes('..')) {
    problems.push(`public/overlays/overlays.json: invalid entry ${index + 1}`)
  }
  if (ids.has(id)) problems.push(`public/overlays/overlays.json: duplicate id ${id}`)
  if (files.has(file)) problems.push(`public/overlays/overlays.json: duplicate file ${file}`)
  if (file && !existsSync(join(root, 'public/overlays', file))) {
    problems.push(`public/overlays/overlays.json: missing file ${file}`)
  }
  ids.add(id)
  files.add(file)
}

if (problems.length) {
  console.error(problems.join('\n'))
  process.exit(1)
}

console.log('Quality checks passed.')