immutable.scala

package com.film42.forecastioapi

import com.eclipsesource.json.JsonObject
import java.net.URL
import java.util.{Date, Scanner}
import spray.json._
import model.ForecastJsonProtocol._
import model._
import scala.util.{Success, Try}

case class ForecastIO(apiKey: String, units: String) {

  def forecast(apiKey: String, lat: String, lon: String, date: Date = new Date()): Try[Forecast] = {
    Success( new Forecast(apiKey, lat, lon, units) )
  }

  def forecast(lat: String, lon: String, date: Date): Try[Forecast] = {
    forecast(apiKey, lat, lon, date)
  }

  def forecast(lat: String, lon: String): Try[Forecast] = {
    forecast(apiKey, lat, lon)
  }

}

//here someone creates one..

val client1 = ForecastIO("mykey", "us")
client1.forecast("352155", "4178247")

//now wants to change "us" to "is"
val client2 = client1.copy(units = "is") 
client2.forecast("352155", "4178247")