#!/usr/bin/env node

// [start-readme]
//
// Run this script to pull openAPI files from github/github, dereference them, and decorate them.
//
// [end-readme]

import fs from 'fs'
import path from 'path'
import program from 'commander'
import { execSync } from 'child_process'
import mkdirp from 'mkdirp'
import rimraf from 'rimraf'
import getOperations from './utils/get-operations.js'

const tempDocsDir = path.join(process.cwd(), 'openapiTmp')
const githubRepoDir = path.join(process.cwd(), '../github')
const dereferencedPath = path.join(process.cwd(), 'lib/rest/static/dereferenced')
const schemas = fs.readdirSync(dereferencedPath)
const decoratedPath = path.join(process.cwd(), 'lib/rest/static/decorated')

program
  .description('Generate dereferenced OpenAPI and decorated schema files.')
  .option(
    '--decorate-only',
    '⚠️ Only used by a 🤖 to generate decorated schema files from existing dereferenced schema files.'
  )
  .parse(process.argv)

const decorateOnly = program.opts().decorateOnly

main()

async function main() {
  // Generate the dereferenced OpenAPI schema files
  if (!decorateOnly) {
    if (!fs.existsSync(githubRepoDir)) {
      console.log(
        `🛑 The ${githubRepoDir} does not exist. Make sure you have a local, bootstrapped checkout of github/github at the same level as your github/docs-internal repo before running this script.`
      )
      process.exit(1)
    }

    await getDereferencedFiles()
  }

  await decorate()

  console.log(
    '\n🏁 The static REST API files are now up-to-date with your local `github/github` checkout. To revert uncommitted changes, run `git checkout lib/rest/static/*.\n\n'
  )
}

async function getDereferencedFiles() {
  // Get the github/github repo branch name and pull latest
  const githubBranch = execSync('git rev-parse --abbrev-ref HEAD', { cwd: githubRepoDir })
    .toString()
    .trim()

  // Only pull master branch because development mode branches are assumed
  // to be up-to-date during active work.
  if (githubBranch === 'master') {
    execSync('git pull', { cwd: githubRepoDir })
  }

  // create a tmp directory to store schema files generated from github/github
  rimraf.sync(tempDocsDir)
  await mkdirp(tempDocsDir)

  console.log(
    `\n🏃‍♀️🏃🏃‍♀️Running \`bin/openapi bundle\` in branch '${githubBranch}' of your github/github checkout to generate the dereferenced OpenAPI schema files.\n`
  )
  try {
    execSync(
      `${path.join(githubRepoDir, 'bin/openapi')} bundle -o ${tempDocsDir} --include_unpublished`,
      { stdio: 'inherit' }
    )
  } catch (error) {
    console.error(error)
    console.log(
      '🛑 Whoops! It looks like the `bin/openapi bundle` command failed to run in your `github/github` repository checkout. To troubleshoot, ensure that your OpenAPI schema YAML is formatted correctly. A CI test runs on your `github/github` PR that flags malformed YAML. You can check the PR diff view for comments left by the openapi CI test to find and fix any formatting errors.'
    )
    process.exit(1)
  }

  execSync(`find ${tempDocsDir} -type f -name "*deref.json" -exec mv '{}' ${dereferencedPath} ';'`)

  rimraf.sync(tempDocsDir)

  // When running in development mode (locally), the the info.version
  // property in the dereferenced schema is replaced with the branch
  // name of the `github/github` checkout. A CI test
  // checks the version and fails if it's not a semantic version.
  schemas.forEach((filename) => {
    const schema = JSON.parse(fs.readFileSync(path.join(dereferencedPath, filename)))
    schema.info.version = `${githubBranch} !!DEVELOPMENT MODE - DO NOT MERGE!!`
    fs.writeFileSync(path.join(dereferencedPath, filename), JSON.stringify(schema, null, 2))
  })
}

async function decorate() {
  console.log('\n🎄 Decorating the OpenAPI schema files in lib/rest/static/dereferenced.\n')

  const dereferencedSchemas = schemas.reduce((acc, filename) => {
    const schema = JSON.parse(fs.readFileSync(path.join(dereferencedPath, filename)))
    const key = filename.replace('.deref.json', '')
    return { ...acc, [key]: schema }
  }, {})

  for (const [schemaName, schema] of Object.entries(dereferencedSchemas)) {
    try {
      // munge OpenAPI definitions object in an array of operations objects
      const operations = await getOperations(schema)

      // process each operation, asynchronously rendering markdown and stuff
      await Promise.all(operations.map((operation) => operation.process()))

      const filename = path.join(decoratedPath, `${schemaName}.json`).replace('.deref', '')
      // write processed operations to disk
      fs.writeFileSync(filename, JSON.stringify(operations, null, 2))

      console.log('Wrote', path.relative(process.cwd(), filename))
    } catch (error) {
      console.error(error)
      console.log(
        "🐛 Whoops! It looks like the decorator script wasn't able to parse the dereferenced schema. A recent change may not yet be supported by the decorator. Please reach out in the #docs-engineering slack channel for help."
      )
      process.exit(1)
    }
  }
}