#!/usr/bin/env node

const fs = require('fs')
const path = require('path')
const program = require('commander')
const allVersions = require('../../lib/all-versions')
const getOperations = require('../rest/utils/get-operations')
const dereferencedDir = 'lib/rest/static/dereferenced'
const decoratedDir = 'lib/rest/static/decorated'

// [start-readme]
//
// This script first copies the dereferenced schema from the previous GHES version for the new one.
// It then replaces references to the previous version's docs URL (e.g., enterprise-server@3.0) with the new version (e.g., enterprise-server@3.1).
// Finally, it generates a new decorated file from the new dereferenced file to ensure that the dereferenced and decorated files match.
//
// [end-readme]

program
  .description('Create new openAPI files in lib/rest/static/decorated and lib/rest/static/dereferenced based on an existing version.')
  .option('-n, --newVersion <version>', 'The new version to copy the REST files to. Must be in <plan@release> format.')
  .option('-o, --oldVersion <version>', 'The existing version to copy the REST files from. Must be in <plan@release> format.')
  .parse(process.argv)

const newVersion = program.newVersion
const oldVersion = program.oldVersion

if (!(newVersion && oldVersion)) {
  console.log('Error! You must provide --newVersion and --oldVersion.')
  process.exit(1)
}

if (!(Object.keys(allVersions).includes(newVersion) && Object.keys(allVersions).includes(oldVersion))) {
  console.log('Error! You must provide the full name of a currently supported version, e.g., enterprise-server@2.22.')
  process.exit(1)
}

main()

async function main () {
  const oldDereferencedFilename = `${allVersions[oldVersion].openApiVersionName}.deref.json`
  const newDereferencedFilename = `${allVersions[newVersion].openApiVersionName}.deref.json`
  const newDecoratedFilename = `${allVersions[newVersion].openApiVersionName}.json`

  const oldDereferencedFile = path.join(dereferencedDir, oldDereferencedFilename)
  const newDereferencedFile = path.join(dereferencedDir, newDereferencedFilename)
  const newDecoratedFile = path.join(decoratedDir, newDecoratedFilename)

  // check that the old files exist
  if (!fs.existsSync(oldDereferencedFile)) {
    console.log(`Error! Can't find ${oldDereferencedFile} for ${oldVersion}.`)
    process.exit(1)
  }

  const oldDereferencedContent = fs.readFileSync(oldDereferencedFile, 'utf8')

  // Replace old version with new version
  // (ex: enterprise-server@3.0 -> enterprise-server@3.1)
  const regexOldVersion = new RegExp(oldVersion, 'gi')
  const newDereferenceContent = oldDereferencedContent.replace(regexOldVersion, newVersion)

  // Write processed dereferenced schema to disk
  fs.writeFileSync(newDereferencedFile, newDereferenceContent)
  console.log(`Created ${newDereferencedFile}.`)

  const dereferencedSchema = require(path.join(process.cwd(), newDereferencedFile))

  // Store all operations in an array of operation objects
  const operations = await getOperations(dereferencedSchema)

  // Process each operation asynchronously
  await Promise.all(operations.map(operation => operation.process()))

  // Write processed operations to disk
  fs.writeFileSync(newDecoratedFile, JSON.stringify(operations, null, 2))
  console.log(`Done! Created ${newDecoratedFile}.`)
}