hamin_RPCFN_2.rb

require 'time'
 
def average_time_of_day(arrival_times)
 
  # This sum value will be used to calculate the average.
  sum = 0

  # next_meridian is the next "am" or "pm" value in the arrival_times, naturally it would be empty for the first arrival_time
  next_meridian = ""
 
  # next_day is used to keep the total_time_in_secs block aware of
  # whether after the first 'PM to AM' transition in the list of times, the following times are
  # also the next day or not. This boolean can later be used to generalize this method further to account
  # for an array of arrival times covering more than 2 days.
  next_day = false
 
  # This block gives us the sum which we can then divide by the length of the list to get the average
  arrival_times.each do |x|
    x.include?("am") ? (temp_meridian = "am") : (temp_meridian = "pm")
    current_day = Time.parse(x).day
    if ((temp_meridian == "am") && (next_meridian == "pm") )|| next_day == true
      sum += Time.parse("#{current_day+1} "+ x).to_f
      next_meridian = temp_meridian
      next_day = true
    else
      sum += Time.parse(x).to_f
      next_meridian = temp_meridian
    end
  end
  
  # Calculate the actual average clock time
  average_time_in_secs = sum / arrival_times.length
  puts Time.at(average_time_in_secs).strftime("%I:%M%p")
end