// Part 2

// (1) the function that calculuates the indices

// for when to buy the commodity and when to sell

val prices = List(28.0, 18.0, 20.0, 26.0, 24.0)

trade_times(prices)

assert(trade_times(prices) == (1, 3), "the first test fails")

// (2) the function that queries the Yahoo financial data

// servive and returns a comma-separated-value list

// (3) the function that processes the comma-separated-value list

// extracting the dates and anjusted close prices

// (4) the function that generates the query for a stock

// market symbol and returns the dates for when to buy and

// sell

def query_comp(name: String): (String, String) = {

  val list = process_page("""http://ichart.yahoo.com/table.csv?s=""" + name).reverse

  val (tbuy, tsell) = trade_times(list.map(_._2))

  (list(tbuy)._1, list(tsell)._1)

//query_comp("GOOG")

for (name <- indices) {

  val times = query_comp(name)

  println(s"Buy ${name} on ${times._1} and sell on ${times._2}")

}