Vaccination Status

Vaccination Status.js

// Constants you can change
const citizensInDenmark = 5837213
const herdImmunityPercentage = 0.65
const url = "https://raw.githubusercontent.com/owid/covid-19-data/master/public/data/vaccinations/country_data/Denmark.csv"
  
// Set constants
const totalVaccinationsNeeded = citizensInDenmark * herdImmunityPercentage * 2

const widget = new ListWidget()
widget.spacing = 4

// Download CSV report
const request = new Request(url)
const csv = await request.loadString()

// Split document into array with one line per index
let lines = csv.split(/\r?\n/)

// Find the last line that has text
var latestEntryLine = ""
while (latestEntryLine.length == 0) {
  latestEntryLine = lines.pop()
}

// Latest entry split into elements
const latestLineElements = latestEntryLine.split(",")

const reportUrl = latestLineElements[3]

const latestDateString = latestLineElements[1]
const latestDate = new Date(latestDateString)
const formatter = new DateFormatter()
formatter.useMediumDateStyle()
var formattedLatestDate = formatter.string(latestDate)

const now = new Date()
const daysToLatest = daysBetween(latestDate, now)

if (daysToLatest == 0) {
  formattedLatestDate = "Today"
} else if (daysToLatest == 1) {
  formattedLatestDate = "Yesterday"
}

const totalDosesGiven = latestLineElements[4]
const percentageGiven = (totalDosesGiven / totalVaccinationsNeeded * 100).toFixed(2)

// Find older entry
var olderEntryLine = ""
for (var i = 0; i < 9; i++) {
  olderEntryLine = lines.pop()
}

// Split into elements
const olderLineElements = olderEntryLine.split(",")

const olderDateString = olderLineElements[1]
const olderDoses = olderLineElements[4]
const olderDate = new Date(olderDateString)

const daysSinceOlderDate = daysBetween(olderDate, latestDate)
const dosesGivenSinceOlderDate = totalDosesGiven - olderDoses

const dosesNeededForHerd = parseInt(totalVaccinationsNeeded * herdImmunityPercentage)
const remainingVaccinations = dosesNeededForHerd - totalDosesGiven
const multiplier = remainingVaccinations / dosesGivenSinceOlderDate
const daysToHerdImmunity = parseInt((daysSinceOlderDate * multiplier))

var dateForHerdImmunity = new Date()
dateForHerdImmunity.setDate(latestDate.getDate() + daysToHerdImmunity)
const formattedDateForHerdImmunity = formatter.string(dateForHerdImmunity)

// Populate UI
const headingW = widget.addText("Vaccinations")
headingW.centerAlignText()
headingW.font = Font.boldSystemFont(15)
headingW.textColor = Color.lightGray()

const percentageW = widget.addText(percentageGiven + "%")
percentageW.centerAlignText()
percentageW.font = Font.systemFont(20)

const dateW = widget.addText(formattedLatestDate)
dateW.centerAlignText()
dateW.font = Font.systemFont(12)
dateW.textColor = Color.lightGray()

widget.addSpacer(4)

const headingTwoW = widget.addText("Herd Date")
headingTwoW.centerAlignText()
headingTwoW.font = Font.boldSystemFont(15)
headingTwoW.textColor = Color.lightGray()

const herdDateW = widget.addText(formattedDateForHerdImmunity)
herdDateW.centerAlignText()
herdDateW.font = Font.systemFont(12)
herdDateW.textColor = Color.lightGray()

if (config.runsInApp) {
  widget.presentSmall()
}

Script.setWidget(widget)
Script.complete()

function daysBetween(date1, date2) {
  const firstDateUTC = Date.UTC(date1.getFullYear(), date1.getMonth(), date1.getDate())
  const secondDateUTC = Date.UTC(date2.getFullYear(), date2.getMonth(), date2.getDate())
  
  return Math.floor((secondDateUTC - firstDateUTC) / (1000 * 60 * 60 * 24))
}