text: import log from '../util/log'
  
  export default function normalizeTailwindDirectives(root) {
    let tailwindDirectives = new Set()
    let layerDirectives = new Set()
    let applyDirectives = new Set()
  
    root.walkAtRules((atRule) => {
      if (atRule.name === 'apply') {
        applyDirectives.add(atRule)
      }
  
      if (atRule.name === 'import') {
        if (atRule.params === '"tailwindcss/base"' || atRule.params === "'tailwindcss/base'") {
          atRule.name = 'tailwind'
          atRule.params = 'base'
        } else if (
          atRule.params === '"tailwindcss/components"' ||
          atRule.params === "'tailwindcss/components'"
        ) {
          atRule.name = 'tailwind'
          atRule.params = 'components'
        } else if (
          atRule.params === '"tailwindcss/utilities"' ||
          atRule.params === "'tailwindcss/utilities'"
        ) {
          atRule.name = 'tailwind'
          atRule.params = 'utilities'
        } else if (
          atRule.params === '"tailwindcss/screens"' ||
          atRule.params === "'tailwindcss/screens'" ||
          atRule.params === '"tailwindcss/variants"' ||
          atRule.params === "'tailwindcss/variants'"
        ) {
          atRule.name = 'tailwind'
          atRule.params = 'variants'
        }
      }
  
      if (atRule.name === 'tailwind') {
        if (atRule.params === 'screens') {
          atRule.params = 'variants'
        }
        tailwindDirectives.add(atRule.params)
      }
  
      if (['layer', 'responsive', 'variants'].includes(atRule.name)) {
        if (['responsive', 'variants'].includes(atRule.name)) {
          log.warn(`${atRule.name}-at-rule-deprecated`, [
            `The \`@${atRule.name}\` directive has been deprecated in Tailwind CSS v3.0.`,
            `Use \`@layer utilities\` or \`@layer components\` instead.`,
            'https://tailwindcss.com/docs/upgrade-guide#replace-variants-with-layer',
          ])
        }
        layerDirectives.add(atRule)
      }
    })
  
    if (
      !tailwindDirectives.has('base') ||
      !tailwindDirectives.has('components') ||
      !tailwindDirectives.has('utilities')
    ) {
      for (let rule of layerDirectives) {
        if (rule.name === 'layer' && ['base', 'components', 'utilities'].includes(rule.params)) {
          if (!tailwindDirectives.has(rule.params)) {
            throw rule.error(
              `\`@layer ${rule.params}\` is used but no matching \`@tailwind ${rule.params}\` directive is present.`
            )
          }
        } else if (rule.name === 'responsive') {
          if (!tailwindDirectives.has('utilities')) {
            throw rule.error('`@responsive` is used but `@tailwind utilities` is missing.')
          }
        } else if (rule.name === 'variants') {
          if (!tailwindDirectives.has('utilities')) {
            throw rule.error('`@variants` is used but `@tailwind utilities` is missing.')
          }
        }
      }
    }
  
    return { tailwindDirectives, applyDirectives }
  }
  