-- extension of math lib
local math = require "math"

math.clamp = function(value, lower, upper)
	if lower > upper then lower, upper = upper, lower end -- swap if boundaries supplied the wrong way
	return math.max(lower, math.min(upper, value))
end

math.sign = function(value) -- Copyright 2013 Arman Darini
	if value > 0 then return 1; elseif value < 0 then return -1; else return 0; end
end

math.round = function(value)
	return math.floor(value + 0.5)
end

math.dice = function(dice, side)
	local value = 0
	for i = 1, dice do
		value = value + math.random(1, side)
	end
	return value
end

-- Probability distribution function
--
-- if 'probabilityPower' is above 1, lower values will be more common than higher values
-- if it's between 0 to 1, higher values will be more common than lower values.
-- If it's 1, the results will be in a general randomness.
math.randomP = function(min, max, probabilityPower)
	return math.floor(min + (max + 1 - min) * (math.pow(math.random(), probabilityPower)))
end

-- @param number 0.0 - 1.0
math.chance = function(chance)
	local value = math.random(0, 10000)
	if value/10000 <= chance then
		return true
	else
		return false
	end
end

return math