LootManager Module

local module = {}


local function usingWeights(slots)
    for i, v in pairs(slots)do
        if(v.Weight)then
            return true
        end
        return false
    end
end


--[[
    Gets total weight between all slots
]]
function module:GetTotalWeight(slots)
    local total = 0
    for _, slot in pairs(slots) do total = total + slot.Weight end
    return total
end


--[[
    Selects a random slot from the table for you.
]]
function module:GetRandomSlot(slots)
    --get total weight/chances
    local total = usingWeights(slots) and self:GetTotalWeight(slots) or 1
    --get a random number based on total weight/chances
    local randomNumber = math.random()*total

    --iterate through all slots and select a random one based on weights/chances
    for _, slot in pairs(slots) do
        local n = slot.Weight or slot.Chance
        if  randomNumber <= n then
            return slot
        else
            randomNumber = randomNumber - n
        end
    end
end


--[[
    Convert Weights into percentages (for debugging purposes / visualization purposes)
    You DONT need this function to create a table based on perctanges.
]]
function module:GetChances(slots)
    local chances = {}
    local total = self:GetTotalWeight(slots)
    for key, slot in pairs(slots)do
        if(not slot.Weight)then return end

        chances[key] = {Chance = slot.Weight / total}

        for i, v in pairs(slot) do
            if(i ~= "Weight") then
                chances[key][i] = v
            end
        end
    end
    return chances
end




return module