exchange.sc

#!/usr/bin/env -S scala-cli shebang --quiet

//> using lib "com.softwaremill.sttp.client3::core:3.8.3"
//> using lib "com.lihaoyi::os-lib:0.8.1"
//> using lib "com.mitchtalmadge:ascii-data:1.4.0"
//> using lib "com.lihaoyi::ujson:2.0.0"

// 147.47 ┤                                          ╭╮    ╭──╮  ╭─╮
// 146.52 ┤                                         ╭╯╰─╮  │  │╭─╯ ╰╮ ╭─╮╭──╮
// 145.56 ┤                                         │   ╰──╯  ╰╯    ╰╮│ ╰╯  │      ╭──╮╭─╮
// 144.60 ┤   ╭─╮╭─╮                             ╭──╯                ╰╯     ╰╮ ╭─╮╭╯  ╰╯ ╰────╮
// 143.64 ┤ ╭─╯ ╰╯ │╭╮╭╮╭─╮            ╭─╮      ╭╯                           ╰─╯ ╰╯           ╰──╮
// 142.68 ┤ │      ╰╯╰╯╰╯ │            │ │     ╭╯                                                ╰╮
// 141.72 ┤╭╯             ╰╮      ╭────╯ ╰─────╯                                                  ╰──
// 140.76 ┤│               │      │
// 139.80 ┼╯               ╰╮    ╭╯
// 138.85 ┤                 ╰────╯

import ujson._
import sttp.client3._
import com.mitchtalmadge.asciidata.graph.ASCIIGraph

import java.time._

val secret = "xxx"

val endDate = if (args.length > 1) LocalDate.parse(args(1)) else LocalDate.now()
val startDate = endDate.minus(Period.ofDays(90))
val client = SimpleHttpClient()
val response = client
  .send(
    basicRequest
      .header("apikey", secret)
      .get(
        uri"https://api.apilayer.com/exchangerates_data/timeseries?start_date=${startDate}&end_date=${endDate}&base=EUR&symbols=JPY"
      )
  )
val responseBody =
  response.body.getOrElse(throw new Exception("Service not responding"))
val data = ujson.read(responseBody)
val values =
  data("rates").obj.toSeq.sortBy(_._1).map((_, value) => value("JPY").num)
println(ASCIIGraph.fromSeries(values.toArray).plot())