#!/usr/bin/env node

// [start-readme]
//
// Run this script to add versions frontmatter and Liquid conditionals for
// GitHub Enterprise Cloud, based on anything currently versioned for the specified release
// of free-pro-team.
//
// [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 { getLiquidConditionals } from '../helpers/get-liquid-conditionals.js'

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

program
  .description(
    'Add versions frontmatter and Liquid conditionals for GitHub EC based on FPT. Runs on all content by default.'
  )
  .option(
    '-p, --products [OPTIONAL PRODUCT_IDS...]',
    'Optional list of space-separated product IDs. Example: admin github developers'
  )
  .parse(process.argv)

const { products } = program.opts()

console.log('✅ Adding EC versioning based on FPT latest versioning')

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

console.log('✅ Running on English content and data\n')

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'))
}

const allContentFiles = englishContentFiles
const 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 GHEC or the given fpt release
  if (!data.versions.fpt) return

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

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

  // Add frontmatter version
  data.versions.ghec = '*'

  // 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('fpt'))
    .filter((c) => !c.includes('ghec'))
}

function updateLiquid(conditionalsToUpdate, content) {
  let newContent = content
  conditionalsToUpdate.forEach((conditional) => {
    // Append "or ghec" to all conditions without it and account for both "{%" and "{%-" tag syntax
    // $1, $2 and $3 are the capture groups from the regex
    newContent = newContent.replace(
      new RegExp(`({%-?)\\s*(ifversion ${escapeRegExp(conditional)})\\s*(%})`),
      '$1 $2 or ghec $3'
    )
  })
  return newContent
}

console.log('Done!')