---@class ResourceClass
---@field Credits number The current credits.
---@field LastCredits number The credits on the last frame.
---@field Income integer The current income.
ResourceClass = {}
ResourceClass.__index = ResourceClass

---Constructs a new Resource object.
function ResourceClass:New()
    local self = setmetatable({}, ResourceClass)

    self.Credits = 0
    self.LastCredits = 0
    self.Income = 0

    return self
end

---Sets the current credits and updates income.
---@param credits number
function ResourceClass:SetCredits(credits)
    self.LastCredits = self.Credits

    if credits < 0 then
        self.Credits = 0
    else
        self.Credits = credits
    end

    self.Income = self.Credits - self.LastCredits
end

function ResourceClass:Debug()
    return string.format("Credits: %d, Income: %d", self.Credits, self.Income)
end