// Бюджет размера web-бандла: node scripts/ci/web-budget.mjs [dist/assets]
// Лимиты — gzip-байты; переопределяются env WEB_BUDGET_ENTRY_GZ / WEB_BUDGET_TOTAL_GZ.
import { readdirSync, readFileSync } from 'node:fs'
import { join } from 'node:path'
import { fileURLToPath } from 'node:url'
import { gzipSync } from 'node:zlib'

export const DEFAULT_LIMITS = {
  entryGz: 25 * 1024,
  totalGz: 560 * 1024,
}

export function measure(dir) {
  let total = 0
  let entry = 0
  for (const name of readdirSync(dir)) {
    if (!name.endsWith('.js')) continue
    const gz = gzipSync(readFileSync(join(dir, name))).length
    total += gz
    if (/^index-.*\.js$/.test(name)) entry = Math.max(entry, gz)
  }
  return { entryGz: entry, totalGz: total }
}

export function checkBudget(dir, limits = DEFAULT_LIMITS) {
  const sizes = measure(dir)
  const errors = []
  if (sizes.entryGz === 0) errors.push('entry chunk index-*.js не найден')
  if (sizes.entryGz > limits.entryGz)
    errors.push(`entry gzip ${sizes.entryGz} > ${limits.entryGz}`)
  if (sizes.totalGz > limits.totalGz)
    errors.push(`total gzip ${sizes.totalGz} > ${limits.totalGz}`)
  return { sizes, errors }
}

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const dir = process.argv[2] ?? 'apps/web/dist/assets'
  const limits = {
    entryGz: Number(process.env.WEB_BUDGET_ENTRY_GZ ?? DEFAULT_LIMITS.entryGz),
    totalGz: Number(process.env.WEB_BUDGET_TOTAL_GZ ?? DEFAULT_LIMITS.totalGz),
  }
  const { sizes, errors } = checkBudget(dir, limits)
  console.log('web bundle (gzip):', sizes, 'limits:', limits)
  if (errors.length) {
    console.error('BUDGET EXCEEDED:\n - ' + errors.join('\n - '))
    process.exit(1)
  }
}