#!/usr/bin/env node

// [start-readme]
//
// Run this script after an Enterprise deprecation to remove Liquid statements and frontmatter that
// contain the deprecated Enterprise version. See the Enterprise deprecation issue template for instructions.
//
// [end-readme]

import fs from 'fs'
import program from 'commander'
import frontmatter from '../../lib/read-frontmatter.js'
import removeLiquidStatements from '../../script/helpers/remove-liquid-statements.js'
import removeDeprecatedFrontmatter from '../../script/helpers/remove-deprecated-frontmatter.js'
import { all, getNextReleaseNumber } from '../../lib/enterprise-server-releases.js'
import walkFiles from '../helpers/walk-files.js'

program
  .description(
    'Remove Liquid conditionals and update versions frontmatter for a given Enterprise Server release.'
  )
  .option('-r, --release <NUMBER>', 'Enterprise Server release number. Example: 2.19')
  .parse(process.argv)

const release = program.opts().release

// verify CLI options
if (!release) {
  console.log(program.description() + '\n')
  program.options.forEach((opt) => {
    console.log(opt.flags)
    console.log(opt.description + '\n')
  })
  process.exit(1)
}

if (!all.includes(release)) {
  console.log(
    `You specified ${release}! Please specify a supported or deprecated release number from lib/enterprise-server-releases.js`
  )
  process.exit(1)
}

const nextOldestRelease = getNextReleaseNumber(release)

console.log(`Deprecating GHES ${release}!\n`)
console.log(`Next oldest version: ${nextOldestRelease}\n`)

// gather content and data files
const contentFiles = walkFiles('content', '.md', { includeEarlyAccess: true })
const reusables = walkFiles('data/reusables', '.md', { includeEarlyAccess: true })
const variables = walkFiles('data/variables', '.yml', { includeEarlyAccess: true })
const allFiles = contentFiles.concat(reusables, variables)

main()

async function main() {
  for (const file of allFiles) {
    const oldContents = fs.readFileSync(file, 'utf8')
    const { content, data } = frontmatter(oldContents)

    // update frontmatter versions prop
    removeDeprecatedFrontmatter(file, data.versions, release, nextOldestRelease)

    // update liquid statements in content and data
    const newContent = removeLiquidStatements(content, release, nextOldestRelease, file)

    // update liquid statements in content frontmatter (like intro and title)
    for (const key in data) {
      const value = data[key]
      if (typeof value === 'string' && value.includes('{% ifversion')) {
        const newValue = removeLiquidStatements(value, release, nextOldestRelease, file)
        data[key] = newValue
      }
    }

    // make sure any intro fields that exist and are empty return an empty string, not null
    if (typeof data.intro !== 'undefined' && !data.intro) {
      data.intro = ''
    }

    // put it all back together
    const newContents = frontmatter.stringify(newContent, data, { lineWidth: 10000 })

    // if the content file is now empty, remove it
    if (newContents.replace(/\s/g, '').length === 0) {
      fs.unlinkSync(file)
      continue
    }

    fs.writeFileSync(file, newContents)
  }

  console.log(`Removed GHES ${release} markup from content and data files! Review and run tests.`)
}