package hw09

// Compile with: scalac calendar.scala
// Run with: scala hw09.calendar

object calendar {

  /*****************************************************************************
   * Warm-Up
   */

  // def unlines(lines: ...): ... = ...


  /*****************************************************************************
   * Calendars
   */

  /**
   * The weekday of January 1st in year y, represented
   * as an Int. 0 is Sunday, 1 is Monday etc.
   */
  def firstOfJan(y: Int): Int = {
    val x = y - 1
    (365*x + x/4 - x/100 + x/400 + 1) % 7
  }

  def isLeapYear(y: Int) =
    if (y % 100 == 0) (y % 400 == 0) else (y % 4 == 0)

  def mlengths(y: Int): List[Int] = {
    val feb = if (isLeapYear(y)) 29 else 28
    List(31, feb, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
  }

  // def firstDay(m: Int, y: Int): Int = ...


  case class Picture(height: Int, width: Int, pxx: List[List[Char]]) {
    // def showIt: String = unlines(pxx).mkString

    // def above(q: Picture) = ...

    // def beside(q: Picture) = ...
  }

  def pixel(c: Char) = Picture(1, 1, List(List(c)))

  // def stack(pics: List[Picture]): Picture = ...

  // def spread(pics: List[Picture]): Picture = ...

  // def tile(pxx: List[List[Picture]]): Picture = ...

  // def rightJustify(w: Int)(chars: List[Char]): Picture = ...

  // def group[T](n: Int, xs: List[T]): List[List[T]] = ...
    
  // def dayPics(d: Int, s: Int): List[Picture] =  ...

  // def calendar(year: Int, month: Int): Picture = ...

  /*****************************************************************************
   * Main method for your tests
   */
  def main(args: Array[String]) {
    println("2012 is leap year: "+ isLeapYear(2012))
  }
}