distribute prioritization

truck_priority.rb

destinations = [
	{ priority: 1, destination_id: "A", trucks: 2, still_needed: 2 },
	{ priority: 2, destination_id: "B", trucks: 2, still_needed: 2 },
	{ priority: 3, destination_id: "C", trucks: 1, still_needed: 1 }
]

def next_destination
	# reset if everyone has been fully supplied
	if destinations.select{|dest| dest[:still_needed] == 0}.count == destinations.count
		destinations.map{|dest| dest[:still_needed] = dest[:trucks]}
	end
	
	destinations_sorted_by_still_needed.first[:destination_id]
end

def destinations_sorted_by_still_needed
	destinations.sort{|a, b| a[:still_needed] <=> b[:still_needed] == 0 ? a[:priority] <=> b[:priority] : a[:still_needed] <=> b[:still_needed]}
end