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local HealthFrame = script.Parent
local CurrentHealth = HealthFrame.CurrentHealth
local HealthLabel = HealthFrame.HealthLabel

local RedVignette = HealthFrame.Parent.RedVignette

local Players = game:GetService("Players")
local Player = Players.LocalPlayer
local Character = nil
local Connection = nil

local LastPercentage = 0

local function SetHealthGuiTransparency(n : number)
    CurrentHealth.Transparency = n
end

local function UpdateHealthLabel(CurrentHealth : number , CurrentMaxHealth : number, HealthPercentage : number)
    HealthLabel.Text = math.max(0,CurrentHealth) .. " / " .. CurrentMaxHealth .. "    [" .. string.sub(tostring(HealthPercentage),1,6) .. "%]"
end

local function SetToDiedText()
    HealthLabel.Text = "Died"
end

local function SetCurrentHealthGuiSize(udim2 : UDim2)
    CurrentHealth:TweenSize(udim2,Enum.EasingDirection.InOut,Enum.EasingStyle.Linear,0.05,true)
end

local function EnableRedVignette(time : number)
    RedVignette.Visible = true
    task.wait(time)
    RedVignette.Visible = false
end

local function Update(health : number)
    if not Character then
        warn("No character")
        return
    end

    local Health = Character.Humanoid.Health
    local MaxHealth = Character.Humanoid.MaxHealth

    local NewSize = math.max(0,Health / MaxHealth)
    local HealthPercentage = NewSize * 100

    SetCurrentHealthGuiSize(UDim2.new(NewSize,0,1,0))
    UpdateHealthLabel(Health,MaxHealth,HealthPercentage)

    if NewSize == 0 then
        SetHealthGuiTransparency(1)
    else
        SetHealthGuiTransparency(0)
    end

    if LastPercentage < HealthPercentage == false then
        if Health <= 0 then
            SetToDiedText()
        else
            EnableRedVignette(0.05)
        end
    end

    LastPercentage = HealthPercentage
end

local function UpdateCharacter()
    Character = Player.Character or Player.CharacterAdded:Wait()

    if Connection then
        Connection:Disconnect()
        Connection = nil
    end

    Connection = Character:WaitForChild("Humanoid").HealthChanged:Connect(Update)

    Update()
end

local function Init()
    Player.CharacterAdded:Connect(UpdateCharacter)
end

Init()