#! /opt/local/bin/ruby

class Difference
        def initialize(array)
                @array = array.map(&:to_i)
        end

        def find_max_difference
                global_min, global_max = *Array.new(2) { @array.first }
                start_index, end_index = *Array.new(2) { 0 }
                @array.each_with_index do |element, i|
                        if element < global_min
                                global_min = element
                                end_index = i
                        else
                                if element > global_max
                                        global_max = element
                                        start_index = i
                                end
                        end
                end
                global_diff = global_max - global_min
                { :global_diff => global_diff, :start_index => start_index, :end_index => end_index }
        end

end

puts "Enter a number of integers seperated by commas and spaces:"

array = gets.split(", ")

puts "\nFinding differences\n"

# 0, -1, -20, 5, 15, 50, 1, -50 as example should return 50, -50: 100 diff
#
difference = Difference.new(array).find_max_difference

puts "Global Difference: #{difference[:global_diff]}\nStarting Index: #{difference[:start_index]} - Value: #{array[difference[:start_index]]}
Ending Index: #{difference[:end_index]} - Value: #{array[difference[:end_index]]}\n"