module TimelineHelper

  def week_pixels
    70
  end
  def day_pixels
    week_pixels / 7
  end
  def max_days
    @weeks * 7
  end
  # number of days from start of month to start of stay
  def started_days(member)
    return 0 unless member.arriving
    return 0 if member.arriving < Date.today.at_beginning_of_month
    distance = (member.arriving - Date.today.at_beginning_of_month).to_i
    distance > max_days ? max_days : distance
  end
  def left_max
    Date.today.at_beginning_of_month + 3.months
  end

  # amount of days of the stay, maxed at the number fo weeks shown
  def stay_days(member)
    return 0 unless member.leaving
    start = member.arriving
    start = Date.today.at_beginning_of_month if member.arriving < Date.today.at_beginning_of_month
    distance = ( member.leaving - start ).to_i
    max = max_days - started_days(member)
    distance > max ? max : distance
  end
  def weekly
    data = {}
    week = 0
    while( week < @weeks ) do
      data[ week ] = -1
      start_week = Date.today.at_beginning_of_month + week.weeks
      end_week = Date.today.at_beginning_of_month + (week + 1).weeks
      @members.each do |mem|
        next unless mem.arriving
        next unless mem.leaving
        next if mem.arriving > start_week
        next if mem.leaving < end_week
        data[ week ] += 1
      end
      week += 1
    end
    data
  end
  def bg_for(week)
    [ "bg-cyan-100",
      "bg-blue-100",
      "bg-violet-100",
      "bg-fuchsia-100",
      "bg-pink-100",
      "bg-rose-100",
      "bg-orange-100",
      "bg-amber-100",
      "bg-yellow-100",
      "bg-lime-100",
      "bg-green-100",
      "bg-teal-100",
    ][week%12]
  end
  def small_date(date)
    date.strftime("%-d.%-m")
  end
end