const fs = require('fs')
const dir = require('node-dir')

const SOURCE_DIR = './config/default/common/config/wv.json/layers/'
const removeKeys = [
  'product',
  'title',
  'subtitle',
  'inactive',
  'daynight',
  'tracks'
]

const errCallback = (err) => {
  if (err) {
    console.log(err)
    throw err
  }
}

function processConfig (filePath) {
  const pathStrings = filePath.split('/')
  const fileName = pathStrings[pathStrings.length - 1]
  if (!fileName.includes('.json')) {
    return
  }
  const layerJson = JSON.parse(fs.readFileSync(filePath, 'utf-8'))
  const layerId = Object.keys(layerJson.layers)[0]
  removeKeys.forEach((key) => {
    const entry = layerJson.layers[layerId]
    // Leave ID prop on WMS entries
    if (entry.type === 'wms' && key === 'id') return
    delete layerJson.layers[layerId][key]
  })
  fs.writeFile(`${filePath}`, JSON.stringify(layerJson, null, 2), errCallback)
}

dir.files(SOURCE_DIR, (err, files) => {
  if (err) throw err
  files.forEach(processConfig)
})