SkillHandler Mockup (Server)

local SkillHandler = {}
SkillHandler.Modules = {}

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local CooldownDurations = require(script:FindFirstChild("CooldownDurations"))

local SkillsFolder = ReplicatedStorage:FindFirstChild("SkillTypes")

local DEFAULT_COOLDOWN = 5

local function ReturnVariations(Skill)
    local Functions = {}

    for Name, Callback in require(Skill) do
        if type(Callback) ~= "function" then continue end

        Functions[Name] = Callback
    end

    return Functions
end

function SkillHandler:Main(Player)
    for _,Style in SkillsFolder:GetDescendants() do
        if not Style:IsA("ModuleScript") then continue end

        self.Modules[Style] = {
            Type = Style:FindFirstAncestorOfClass("Folder"),
            Variations = ReturnVariations(Style)
        }
    end
end

function SkillHandler:StartCooldown(Player, Skill)
    local Duration = CooldownDurations[Skill] or DEFAULT_COOLDOWN
    local CooldownBegan, Cooldowns = os.clock(), self.PlayerData:GetValue(Player, "Cooldowns")

    table.insert(Cooldowns, Skill)

    task.spawn(function()
        repeat task.wait() until os.clock() - CooldownBegan > Duration

        table.remove(Cooldowns, self.Shared["TableUtil"]:GetIndex(Cooldowns, Skill))
    end)
end

function SkillHandler:CastSkill(Player, Skill)
    local Values = self.PlayerData:GetAllValues(Player)
    if Values.Attacking or Values.Guarding then return end

    local OnCooldown = table.find(self.PlayerData:GetValue(Player, "Cooldowns"), Skill)
    if OnCooldown then
        warn(Skill,"is currently on cooldown.")
        return
    end

    local PerformedStyle = nil
    for Style, StyleData in self.Modules do
        if not self.Shared:HasFunction(Skill, require(Style)) then continue end

        PerformedStyle = Style
    end

    self:StartCooldown(Player, Skill)
    self.Shared["ClientServer"]:FireAllClients("EffectsHandler", "CastSkill", {
        Style = PerformedStyle,
        Variation = Skill,
        Caster = Player
    })
end