-- Settings
local DAMAGE_COLOR = Color3.fromRGB(255, 75, 75)
local DEATH_COLOR = Color3.fromRGB(255, 0, 0)
local HEAVY_HIT_THRESHOLD = 50
local STACK_RESET_TIME = 5.0 -- Damage memory lasts 5s
local DISPLAY_TIME = 1.3     -- Animation lasts 1.3s
local BASE_SHAKE = 0.12
local BASE_SIZE = 2.2 

local DamagePools = {}    -- Persistent damage totals
local ActiveVisuals = {}  -- Current active Billboard per humanoid

local function formatDamage(amount)
    local absAmount = math.abs(amount)
    return (absAmount % 1 == 0) and tostring(math.floor(absAmount)) or string.format("%.1f", absAmount)
end

local function createIndicator(humanoid, amount, isDeath)
    local root = humanoid.Parent:FindFirstChild("HumanoidRootPart") or humanoid.Parent:FindFirstChild("Head")
    if not root then return end

    -- 1. Handle the Persistent Damage Pool (5s Memory)
    if not DamagePools[humanoid] then
        DamagePools[humanoid] = {Total = 0, LastHit = 0}
    end
    
    local pool = DamagePools[humanoid]
    
    -- If it's been more than 5s, start the stack over
    if tick() - pool.LastHit > STACK_RESET_TIME then
        pool.Total = math.abs(amount)
    else
        pool.Total = pool.Total + math.abs(amount)
    end
    pool.LastHit = tick()
    
    local displayAmount = pool.Total

    -- 2. Handle the Instant Visual Update
    -- If a number is already floating, destroy it so we can "restart" the animation
    if ActiveVisuals[humanoid] then
        ActiveVisuals[humanoid]:Destroy()
        ActiveVisuals[humanoid] = nil
    end

    -- Create Billboard
    local billboard = Instance.new("BillboardGui")
    billboard.Size = UDim2.new(BASE_SIZE, 0, BASE_SIZE, 0)
    billboard.Adornee = root
    billboard.AlwaysOnTop = true
    ActiveVisuals[humanoid] = billboard
    
    local label = Instance.new("TextLabel")
    label.Size = UDim2.new(1, 0, 1, 0)
    label.BackgroundTransparency = 1
    label.TextScaled = true
    label.Font = Enum.Font.Cartoon
    label.TextStrokeTransparency = 0
    label.Rotation = math.random(-15, 15)
    
    local isHeavy = displayAmount >= HEAVY_HIT_THRESHOLD
    if isDeath then
        label.Text = "DEATH"
        label.TextColor3 = DEATH_COLOR
    else
        label.Text = formatDamage(displayAmount)
        label.TextColor3 = isHeavy and Color3.new(1, 1, 1) or DAMAGE_COLOR
    end
    
    label.Parent = billboard
    billboard.Parent = game.CoreGui
    
    -- 3. Visual Animation Logic (Exactly 1.3s)
    task.spawn(function()
        local startTime = tick()
        while (tick() - startTime < DISPLAY_TIME) and (ActiveVisuals[humanoid] == billboard) do
            local elapsed = tick() - startTime
            local progress = elapsed / DISPLAY_TIME
            
            -- Strobe
            if isHeavy and not isDeath then
                label.TextColor3 = (math.sin(tick() * 25) > 0) and Color3.new(1, 1, 1) or Color3.new(1, 0, 0)
            end
            
            -- Shake & Float
            local currentShake = isDeath and (BASE_SHAKE * 3) or (isHeavy and BASE_SHAKE * 2 or BASE_SHAKE)
            local yOffset = 3 + (progress * 3.5)
            
            -- Size Pop
            local sizeMult = 1.0
            if progress < 0.25 then
                sizeMult = isDeath and 2.0 or (isHeavy and 1.7 or 1.4)
                sizeMult = sizeMult - (progress * 1.5)
            end
            billboard.Size = UDim2.new(BASE_SIZE * sizeMult, 0, BASE_SIZE * sizeMult, 0)
            
            local shakeX = (math.random() - 0.5) * currentShake
            local shakeY = (math.random() - 0.5) * currentShake
            billboard.ExtentsOffset = Vector3.new(shakeX, yOffset + shakeY, 0)
            
            -- Fade
            label.TextTransparency = progress
            label.TextStrokeTransparency = progress
            
            task.wait()
        end
        
        -- Only destroy and clean up if this specific billboard is still the active one
        if ActiveVisuals[humanoid] == billboard then
            billboard:Destroy()
            ActiveVisuals[humanoid] = nil
        end
    end)
end

-- Humanoid Watcher
local function watch(hum)
    local lastH = hum.Health
    hum.HealthChanged:Connect(function(newH)
        local d = newH - lastH
        if d <= -0.1 then
            createIndicator(hum, d, (newH <= 0 and lastH > 0))
        end
        lastH = newH
    end)
end

for _, v in pairs(workspace:GetDescendants()) do if v:IsA("Humanoid") then watch(v) end end
workspace.DescendantAdded:Connect(function(v) if v:IsA("Humanoid") then watch(v) end end)