portofolia.scala

object portfolio {

  /**
   * EXERCISE 1
   *
   * Using only sealed traits and case classes, develop a model of a stock
   * exchange. Ensure there exist values for NASDAQ and NYSE.
   */
  sealed trait Exchange
  object Exchange {
    final case object NASDAQ extends Exchange
    final case object NYSE extends Exchange
  }

  /**
   * EXERCISE 2
   *
   * Using only sealed traits and case classes, develop a model of a currency
   * type.
   */
  sealed trait CurrencyType 
  object CurrencyType {
    final case object USD extends CurrencyType
    final case object EUR extends CurrencyType
  }

  /**
   * EXERCISE 3
   *
   * Using only sealed traits and case classes, develop a model of a stock
   * symbol. Ensure there exists a value for Apple's stock (APPL).
   */
  sealed trait StockSymbol {
    def currentValue: BigDecimal
    def currency: CurrencyType
    def exchange: Exchange
  }

  object StockSymbol {
    final case class APPL(currentValue: BigDecimal, currency: CurrencyType, exchange: Exchange) extends StockSymbol
    final case class T(currentValue: BigDecimal, currency: CurrencyType, exchange: Exchange) extends StockSymbol
  }

  /**
   * EXERCISE 4
   *
   * Using only sealed traits and case classes, develop a model of a portfolio
   * held by a user of the web application.
   */
  final case class Portfolio(stocks: Map[StockSymbol, BigDecimal])

  /**
   * EXERCISE 5
   *
   * Using only sealed traits and case classes, develop a model of a user of
   * the web application.
   */
  final case class User(userId: String, name: String)

  /**
   * EXERCISE 6
   *
   * Using only sealed traits and case classes, develop a model of a trade type.
   * Example trade types might include Buy and Sell.
   */
  sealed trait TradeType 
  object TradeType {
    final case object Buy extends TradeType
    final case object Sell extends TradeType
  }

  /**
   * EXERCISE 7
   *
   * Using only sealed traits and case classes, develop a model of a trade,
   * which involves a particular trade type of a specific stock symbol at
   * specific prices.
   */
  final case class Trade(tradeType: TradeType, quantity: Int, symbol: StockSymbol, price: BigDecimal, currencyType: CurrencyType)
}