repackLuftstatus.js

const data = require('./data.json')

function returnHighestColor (list) {
  let color = 'ffffff'
  if (list.includes('990099')) {
    color = '990099'
  } else if (list.includes('ff0000')) {
    color = 'ff0000'
  } else if (list.includes('ff9900')) {
    color = 'ff9900'
  } else if (list.includes('6ee86e')) {
    color = '6ee86e'
  }
  return color
}

function replaceLetters (data) {
  data = data.replace(' ', '')
  data = data.replace('/', '-')
  data = data.replace('æ', 'oe')
  data = data.replace('å', 'aa')
  data = data.replace('ø', 'oe')
  return data
}

function generateIdFromFields (...args) {
  return args.map(data => data.toString().toLowerCase()).map(replaceLetters).join('-')
}

const byStation = data.reduce((prev, current) => {
  const eoi = current.eio || generateIdFromFields(current.area, current.zone, current.municipality)
  if (!prev.hasOwnProperty(eoi)) {
    prev[eoi] = Object.assign(current, {data: []})
  }
  prev[eoi].data.push({
    component: current.component,
    fromTime: current.fromTime,
    toTime: current.toTime,
    value: current.value,
    unit: current.unit,
    color: current.color
  })

  return prev
}, {})

const byStationAggregatedColor = Object.values(byStation).map(station => Object.assign(station, {color: returnHighestColor(station.data.map(data => data.color))}))

const byMunicipality = Object.values(byStationAggregatedColor).reduce((prev, current) => {
  const municipality = current.municipality !== 'N/A' ? current.municipality : generateIdFromFields(current.area, current.zone, current.municipality)
  if (!prev.hasOwnProperty(municipality)) {
    prev[municipality] = {
      zone: current.zone,
      municipality: current.municipality,
      area: current.area,
      stations: []
    }
  }
  prev[municipality].stations.push(current)

  return prev
}, {})

const byMunicipalityAggregatedColor = Object.values(byMunicipality).map(municipality => Object.assign(municipality, {color: returnHighestColor(municipality.stations.map(data => data.color))}))

console.log(JSON.stringify(Object.values(byMunicipalityAggregatedColor), null, 2))