const files = [
  // "gun_violence",
  "mass_shootings_from_columbine",
  "firearms_manufactured",
  "ar_15_2016_18",
]
const parse = require('csv-parse')

const dataPromises = files.map(name => {
  return fetch('./data/' + name + '.csv').then(rows => {
    return rows.text()
  }).then(text => {
    return new Promise((resolve, reject) => {
      parse(text, {}, (_, lines) => resolve(lines))
    })
  }).then(lines => {
    // console.log(name, lines)
    const h = lines.shift()
    return {
      name,
      h,
      lines: lines.filter(s => !!s)
    }
  })
})
const allPromises = Promise.all(dataPromises).then(data => {
  return data.reduce((a,b) => {
    // console.log(b)
    a[b.name] = b
    return a
  }, {})
})
const load = () => {
  return allPromises
}

export { load }