#!/usr/bin/env node

// [start-readme]
//
// Run this script to add versions frontmatter and Liquid conditionals for
// GitHub AE, based on anything currently versioned for the specified release
// of Enterprise Server. This script should be run as part of the Enterprise
// Server release process.
//
// [end-readme]

import fs from 'fs'
import path from 'path'
import walk from 'walk-sync'
import program from 'commander'
import { escapeRegExp } from 'lodash-es'
import frontmatter from '../../lib/read-frontmatter.js'
import versionSatisfiesRange from '../../lib/version-satisfies-range.js'
import { getLiquidConditionals } from '../helpers/get-liquid-conditionals.js'

const contentPath = path.join(process.cwd(), 'content')
const dataPath = path.join(process.cwd(), 'data')
const translationsPath = path.join(process.cwd(), 'translations')

program
  .description(
    'Add versions frontmatter and Liquid conditionals for GitHub AE based on a given Enterprise Server release. Runs on all content by default.'
  )
  .option(
    '-r, --ghes-release <RELEASE>',
    'The Enterprise Server release to base AE versioning on. Example: 2.23'
  )
  .option(
    '-p, --products [OPTIONAL PRODUCT_IDS...]',
    'Optional list of space-separated product IDs. Example: admin github developers'
  )
  .option('-t, --translations', 'Run the script on content and data in translations too.')
  .parse(process.argv)

const { ghesRelease, products, translations } = program.opts()

if (!ghesRelease) {
  console.error('Must provide an Enterprise Server release number!')
  process.exit(1)
}

console.log(`✅ Adding AE versioning based on GHES ${ghesRelease} versioning`)

if (products) {
  console.log(`✅ Running on the following products: ${products}`)
} else {
  console.log('✅ Running on all products')
}

if (translations) {
  console.log('✅ Running on both English and translated content and data\n')
} else {
  console.log('✅ Running on English content and data\n')
}

// Match: ghes <operator> <release>
// Example: ghes > 2.21
const ghesRegex = new RegExp(`ghes (<|>|=|!=) ${ghesRelease}`)

console.log('Working...\n')

const englishContentFiles = walkContent(contentPath)
const englishDataFiles = walkData(dataPath)

function walkContent(dirPath) {
  const productArray = products || ['']
  return productArray
    .map((product) => {
      dirPath = path.join(contentPath, product)
      return walk(dirPath, { includeBasePath: true, directories: false })
        .filter((file) => file.includes('/content/'))
        .filter((file) => file.endsWith('.md'))
        .filter((file) => !file.endsWith('README.md'))
    })
    .flat()
}

function walkData(dirPath) {
  return walk(dirPath, { includeBasePath: true, directories: false })
    .filter((file) => file.includes('/data/reusables') || file.includes('/data/variables'))
    .filter((file) => !file.endsWith('README.md'))
}

let allContentFiles, allDataFiles
if (translations) {
  const translatedContentFiles = walkContent(translationsPath)
  const translatedDataFiles = walkData(translationsPath)
  allContentFiles = englishContentFiles.concat(translatedContentFiles)
  allDataFiles = englishDataFiles.concat(translatedDataFiles)
} else {
  allContentFiles = englishContentFiles
  allDataFiles = englishDataFiles
}

// Update the data files
allDataFiles.forEach((file) => {
  const dataContent = fs.readFileSync(file, 'utf8')

  const conditionalsToUpdate = getConditionalsToUpdate(dataContent)
  if (!conditionalsToUpdate.length) return

  // Update Liquid in data files
  const newDataContent = updateLiquid(conditionalsToUpdate, dataContent)

  fs.writeFileSync(file, newDataContent)
})

// Update the content files
allContentFiles.forEach((file) => {
  const { data, content } = frontmatter(fs.readFileSync(file, 'utf8'))

  // Return early if the current page frontmatter does not apply to either GHAE or the given GHES release
  if (
    !(
      data.versions['github-ae'] ||
      versionSatisfiesRange(ghesRelease, data.versions['enterprise-server'])
    )
  )
    return

  const conditionalsToUpdate = getConditionalsToUpdate(content)
  if (!conditionalsToUpdate.length) return

  // Update Liquid in content files
  const newContent = updateLiquid(conditionalsToUpdate, content)

  // Add frontmatter version
  data.versions['github-ae'] = '*'

  // Update Liquid in frontmatter props
  Object.keys(data)
    .filter((key) => typeof data[key] === 'string')
    .forEach((key) => {
      const conditionalsToUpdate = getConditionalsToUpdate(data[key])
      if (!conditionalsToUpdate.length) return
      data[key] = updateLiquid(conditionalsToUpdate, data[key])
    })

  fs.writeFileSync(file, frontmatter.stringify(newContent, data, { lineWidth: 10000 }))
})

function getConditionalsToUpdate(content) {
  return getLiquidConditionals(content, 'ifversion')
    .filter((c) => !c.includes('ghae'))
    .filter((c) => doesReleaseSatisfyConditional(c.match(ghesRegex)))
}

function updateLiquid(conditionalsToUpdate, content) {
  let newContent = content
  conditionalsToUpdate.forEach((cond) => {
    const oldConditional = `{% ifversion ${cond} %}`
    const newConditional = `{% ifversion ${cond.concat(' or ghae')} %}`
    const oldConditionalRegex = new RegExp(escapeRegExp(oldConditional), 'g')

    // Then replace all instances of the conditional in the content
    newContent = newContent.replace(oldConditionalRegex, newConditional)
  })

  return newContent
}

console.log('Done!')

function doesReleaseSatisfyConditional(ghesMatch) {
  if (!ghesMatch) return false

  // Operator (e.g., <)
  const operator = ghesMatch[1]

  // Release number (e.g., 2.21)
  const number = ghesMatch[2]

  return versionSatisfiesRange(ghesRelease, `${operator}${number}`)
}