combat.lua

local SpellResistType = {
	SpellResult.Miss,
	SpellResult.Resist,
	SpellResult.Resist75,
	SpellResult.Resist50,
	SpellResult.Resist25,
	SpellResult.ResistNone,
}

local SPELL_RESISTANCE = {
	--resist, 100%, 75%, 50%, 25%, full
	[0] =  {0, 0, 0, 0, 0, 0};     --none 
	[50] =  {0, 0, 2, 11, 33, 54}; --poor 
	[100] = {1, 1, 6, 24, 49, 20}; --fair
	[150] = {1, 1, 18, 48, 26, 7}; --good
	[200] = {11, 11, 34, 40, 14, 1}; --good
	[250] = {25, 25, 55, 16, 3, 1}; --very good
	[300] = {35, 35, 65, 6, 1, 1}; --very good
	[350] = {55, 55, 45, 10, 0, 0}; --super
}

function GetResistanceTable(resistance)
	local min = 0
	local max = 350
	local ret = Array.ShallowCopy(SPELL_RESISTANCE[350])
	for res = 0, 350, 50 do
		if resistance >= res then
			min = res
		end
	end

	if resistance < 350 then
		max = min + 50

		if resistance == min then
			return SPELL_RESISTANCE[min]
		end

		local alpha = (resistance-min) / (max-min)
		print(string.format("res:%s, min:%s, max:%s, alpha:%s", tostring(resistance), tostring(min), tostring(max), tostring(alpha)))
		for i = 1, 6 do
			ret[i] = mathLib.Lerp(SPELL_RESISTANCE[min][i], SPELL_RESISTANCE[max][i], alpha)  
		end
	end
	return ret
end


function Combat.GetResistanceRoll(resistance, school)
	--local resistance = target:GetStat(school.."Resistance") + target:GetStat("Resistance")
	if resistance <= 0 then
		return SpellResult.ResistNone -- NO RESISTS
	end

	local resTable = GetResistanceTable(resistance)

	local sum = 0
	for key, value in ipairs(resTable) do
		sum += value
	end

	local rand = math.random(0, sum) -- i think max is exclusive?


	local acc = 0
	for key, value in ipairs(resTable) do
		acc += value
		if acc >= rand then
			return SpellResistType[key]
		end
	end
	return SpellResult.ResistNone
end