#!/usr/bin/env node

// [start-readme]
//
// Run this script to remove reusables and image files that exist in the repo but
// are not used in content files. It also displays a list of unused variables. Set
// the `--dry-run` to flag to print results without deleting any files. For images
// you don't want to delete, add them to `ignoreList` in `lib/find-unused-assets.js`
//
// [end-readme]

import { fileURLToPath } from 'url'
import path from 'path'
import fs from 'fs'
import findUnusedAssets from './helpers/find-unused-assets.js'
const __dirname = path.dirname(fileURLToPath(import.meta.url))

const dryRun = process.argv.slice(2).includes('--dry-run')
main()

async function main() {
  if (dryRun) {
    console.log('This is a dry run! The script will report unused files without deleting anything.')
  }

  removeUnusedReusables(await findUnusedAssets('reusables'))
  removeUnusedImages(await findUnusedAssets('images'))
  printUnusedVariables(await findUnusedAssets('variables'))
}

function removeUnusedReusables(reusables) {
  logMessage(reusables, 'reusable')

  reusables.forEach((reusable) => {
    const reusablePath = path.join(
      __dirname,
      '..',
      reusable.replace('site', '').replace(/\./g, '/').replace(/$/, '.md')
    )
    dryRun ? console.log(reusable) : fs.unlinkSync(reusablePath)
  })
}

function removeUnusedImages(images) {
  logMessage(images, 'image')

  images.forEach((image) => {
    const imagePath = path.join(__dirname, '..', image)
    dryRun ? console.log(image) : fs.unlinkSync(imagePath)
  })
}

// multiple variables are embedded in within the same YML file
// so we can't just delete the files, and we can't parse/modify
// them either because js-yaml does not preserve whitespace :[
function printUnusedVariables(variables) {
  logMessage(variables, 'variable')

  variables.forEach((variable) => {
    const variableKey = variable.split('.').pop()
    const variablePath = path.join(
      process.cwd(),
      variable
        .replace('site', '')
        .replace(`.${variableKey}`, '')
        .replace(/\./g, '/')
        .replace(/$/, '.yml')
    )
    dryRun
      ? console.log(variable)
      : console.log(
          `* found but did not delete '${variableKey}' in ${variablePath.replace(
            process.cwd(),
            ''
          )}`
        )
  })

  if (!dryRun) console.log('\nYou will need to manually delete any variables you want to remove.')
}

function logMessage(list, type) {
  let action

  if (dryRun) {
    action = '\n**Found'
  } else {
    action = type === 'variable' ? ':eyes: **Found' : ':scissors: **Removed'
  }

  console.log(`${action} ${list.length} unused ${type} ${list.length === 1 ? 'file' : 'files'}**\n`)
}