# from http://izumi.plan99.net/blog/index.php/2008/01/17/ruby-vs-php-performance/
require File.dirname(__FILE__) + '/../lib/benchutils'

label = File.expand_path(__FILE__).sub(File.expand_path("..") + "/", "")
iterations = ARGV[-3].to_i
timeout = ARGV[-2].to_i
report = ARGV.last

def merge(a, b)
	c = []
	while !a.empty? && !b.empty?
		if a[0] > b[0]
			c << b[0]
			b.shift
		else
			c << a[0]
			a.shift
		end
	end
	while !a.empty?
		c << a[0]
		a.shift
	end
	while !b.empty?
		c << b[0]
		b.shift
	end
	return c
end

def mergesort(a)
	n = a.size
	if n <= 1
		return a
	end

	l1 = []
	l2 = []
	i = 0
	while i < n / 2
		l1 << a[i]
		i += 1
	end
	while i < n
		l2 << a[i]
		i += 1
	end
	
	l1 = mergesort(l1)
	l2 = mergesort(l2)
	return merge(l1, l2)
end

numbers = [47448054, 1106251565, 1208921855, 170086026, 840395770, 444281018, 1297307905, 1613614128, 357068250, 1829657695, 654555439, 1261773796, 1821640729, 449683981, 1062536538, 96076061, 1387478498, 1835855315, 364455615, 4830124, 864633601, 289493189, 471351435, 435996916, 1366312031, 888420407, 1923379522, 735726044, 1094401518, 245520239, 109946712, 1107893495, 592868510, 700148765, 273016388, 343881444, 420725947, 1259049694, 1692920986, 71271532, 1154617350, 593508009, 1106700528, 430204045, 1045928775, 1330476642, 49983990, 1451164767, 1175404600, 644832496, 365016297, 1048732794, 503615317, 217186301, 1176160338, 1183622513, 81711049, 1720671278, 1393072097, 1315236388, 1451774341, 92848458, 271000544, 1667871288, 380233084, 1053079658, 1249341507, 1276652307, 1722015039, 1243698025, 178813868, 1449271074, 1994327579, 270972819, 1043379189, 1592595484, 462468972, 1464773315, 1994172406, 997300623, 46405283, 1614271949, 447907123, 317292284, 378291676, 1253835093, 523476912, 1606023999, 59263848, 1234358080, 140981643, 1828471854, 1197394207, 1317927546, 878287915, 334576359, 982149842, 642878238, 1024064999, 1834342299];
benchmark = BenchmarkRunner.new(label, iterations, timeout)
benchmark.run do
 3000.times do
	mergesort(numbers)
 end
end
  
File.open(report, "a") {|f| f.puts "#{benchmark.to_s},n/a" }

