import fs from 'node:fs'
import path from 'node:path'

function parseBoolean(value, defaultValue) {
  const normalized = String(value ?? '').trim().toLowerCase()
  if (!normalized) return defaultValue
  if (['1', 'true', 'yes', 'on', 'enabled'].includes(normalized)) return true
  if (['0', 'false', 'no', 'off', 'disabled'].includes(normalized)) return false
  return defaultValue
}

function parseArgs(argv) {
  const options = {
    out: '',
    fallbackEnabled: null,
    superTokensReady: null,
  }
  for (let i = 2; i < argv.length; i += 1) {
    const token = String(argv[i] || '').trim()
    if (token === '--out' && argv[i + 1]) {
      options.out = String(argv[i + 1]).trim()
      i += 1
      continue
    }
    if (token === '--fallback-enabled' && argv[i + 1]) {
      options.fallbackEnabled = parseBoolean(argv[i + 1], true)
      i += 1
      continue
    }
    if (token === '--supertokens-ready' && argv[i + 1]) {
      options.superTokensReady = parseBoolean(argv[i + 1], false)
      i += 1
      continue
    }
  }
  return options
}

function buildRuntimeConfig(options = {}) {
  const fallbackEnabled = options.fallbackEnabled !== null
    ? options.fallbackEnabled
    : parseBoolean(process.env.VITE_AUTH_FALLBACK_ENABLED, true)
  const superTokensReady = options.superTokensReady !== null
    ? options.superTokensReady
    : parseBoolean(process.env.VITE_AUTH_SUPERTOKENS_READY, false)

  return {
    auth: {
      source: 'ui_runtime_config',
      fallback: {
        enabled: fallbackEnabled,
      },
      supertokens: {
        ready: superTokensReady,
      },
    },
  }
}

function writeRuntimeConfig(outPath, config) {
  const resolved = path.resolve(process.cwd(), outPath)
  fs.mkdirSync(path.dirname(resolved), { recursive: true })
  fs.writeFileSync(resolved, `${JSON.stringify(config, null, 2)}\n`, 'utf8')
  return resolved
}

function main(argv = process.argv) {
  const options = parseArgs(argv)
  const config = buildRuntimeConfig(options)
  const outputPath = writeRuntimeConfig(options.out || 'public/config.json', config)
  process.stdout.write(`[runtime-config] wrote ${outputPath}\n`)
}

main()