import mkdirp from 'mkdirp'
import path from 'path'
import fsp from 'fs/promises'

function normalize(data) {
  return data.rows.map(row => {
    const obj = {}
    row.forEach((col, i) => {
      obj[data.headers[i]] = col
    })

    return obj
  })
}

function percentChange (current, prev) {
  const change = current - prev
  let percent = (change / Math.abs(prev)) * 100

  if (isNaN(percent)) return 0

  const sign = percent > 0 ? '+' : '-'
  if (Math.abs(percent) === Infinity) percent = 100

  return `${sign}${Math.abs(percent.toFixed(2)).toLocaleString()}`
}

function replaceVariables (template, variables) {
  Object.keys(variables).forEach(key => {
    let value = variables[key]
    if (typeof value === 'number') value = value.toLocaleString()

    template = template.split(`{${key}}`).join(value)
  })

  return template
}


async function readJSON(file) {
  return JSON.parse(await fsp.readFile(file, 'utf-8'))
}

async function process () {
  const template = await fsp.readFile('./data/parser/reddit/template.md', 'utf-8')

  const data = {
    tests: normalize(await readJSON('./public/data/overall/testing/by-county/-- All --.json')).reverse(),
    cases: normalize(await readJSON('./public/data/overall/cases/by-county/-- All --.json')).reverse(),
    hospitalizations: normalize(await readJSON('./public/data/overall/hospitalizations/by-county/-- All --.json')).reverse(),
    deaths: normalize(await readJSON('./public/data/overall/deaths/by-county/-- All --.json')).reverse(),
    vaccinations: normalize(await readJSON('./public/data/overall/vaccinations/by-county/-- All --.json')).reverse(),
  }

  function formatRow(data, index) {
    const prevData = {
      tests: data.tests[index + 1],
      cases: data.cases[index + 1],
      hospitalizations: data.hospitalizations[index + 1],
      deaths: data.deaths[index + 1],
      vaccinations: data.vaccinations[index + 1],
    }

    const currentData = {
      tests: data.tests[index],
      cases: data.cases[index],
      hospitalizations: data.hospitalizations[index],
      deaths: data.deaths[index],
      vaccinations: data.vaccinations[index],
    }

    currentData.hospitalizations.total_hospitalizations = data.hospitalizations.reduce((total, r) => {
      return total + r.hospitalizations
    }, 0)

    const date = new Date(`${currentData.tests.report_date} 23:59:59`)

    const date_short = `${`${(date.getMonth() + 1)}`.padStart(2, '0')}/${`${date.getDate()}`.padStart(2, '0')}`

    const computedData = {
      date,
      date_short,
      date_long: date.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' }),
      current_percent_positive: Math.round(currentData.tests.seven_day_percent_positive),
      current_tests: 0, // currentData.tests.combined_performed_running_total.toLocaleString(),
      current_cases: currentData.cases.total_cases.toLocaleString(),
      current_hospitalizations: currentData.hospitalizations.total_hospitalizations.toLocaleString(),
      current_deaths: currentData.deaths.total_deaths.toLocaleString(),
      current_vaccinations: currentData.vaccinations.total_vaccinations.toLocaleString(),
      current_tests_increase: 0, //(currentData.tests.combined_performed_running_total - prevData.tests.combined_performed_running_total).toLocaleString(),
      current_cases_increase: currentData.cases.cases.toLocaleString(),
      current_hospitalizations_increase: currentData.hospitalizations.hospitalizations.toLocaleString(),
      current_deaths_increase: currentData.deaths.deaths.toLocaleString(),
      current_vaccinations_increase: currentData.vaccinations.vaccinations.toLocaleString(),
      current_tests_change_percent: percentChange(currentData.tests.combined_performed, prevData.tests.combined_performed),
      current_cases_change_percent: percentChange(currentData.cases.cases, prevData.cases.cases),
      current_hospitalizations_change_percent: percentChange(currentData.hospitalizations.hospitalizations, prevData.hospitalizations.hospitalizations),
      current_deaths_change_percent: percentChange(currentData.deaths.deaths, prevData.deaths.deaths),
      current_vaccinations_change_percent: percentChange(currentData.vaccinations.vaccinations, prevData.vaccinations.vaccinations),
    }

    return computedData
  }

  const results = []

  for (let i = 0; i < 30; i++) {
    results.push(formatRow(data, i))
  }

  const variables = {
    ...results.at(0),
    table_rows: results.map(row => {
      return `| ${[
        row.date_short,
        `${row.current_percent_positive}%`,
        `${row.current_cases_increase} [${row.current_cases_change_percent}%]`,
        `${row.current_hospitalizations_increase} [${row.current_hospitalizations_change_percent}%]`,
        `${row.current_deaths_increase} [${row.current_deaths_change_percent}%]`,
        `${row.current_vaccinations_increase} [${row.current_vaccinations_change_percent}%]`,
      ].join(' | ')} |`
    }).join('\n')
  }

  console.log(replaceVariables(template, variables))
}

process()