-- 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 -- Time before the total damage resets to 0
local DISPLAY_TIME = 1.3     -- Time the number takes to float and fade
local BASE_SHAKE = 0.12
local BASE_SIZE = 2.2 

local ActiveIndicators = {} -- Tracks the single active UI per humanoid

local function formatDamage(amount)
    local absAmount = math.abs(amount)
    -- Custom Smart Decimals logic
    if absAmount % 1 == 0 then
        return tostring(math.floor(absAmount))
    else
        return string.format("%.1f", absAmount)
    end
end

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

    -- 1. Handle Stacking & Timer Reset
    if ActiveIndicators[humanoid] then
        local data = ActiveIndicators[humanoid]
        
        -- If the 5s window has passed, start a new total. Otherwise, add to it.
        if tick() - data.LastHitTime > STACK_RESET_TIME then
            data.TotalDamage = math.abs(amount)
        else
            data.TotalDamage = data.TotalDamage + math.abs(amount)
        end
        
        data.LastHitTime = tick()
        data.AnimationStart = tick() -- Reset the 1.3s float/fade animation
        data.IsDeath = isDeath or data.IsDeath
        
        -- Instant UI Update
        data.Label.TextTransparency = 0
        data.Label.TextStrokeTransparency = 0
        if data.IsDeath then
            data.Label.Text = "DEATH"
            data.Label.TextColor3 = DEATH_COLOR
        else
            data.Label.Text = formatDamage(data.TotalDamage)
            data.Label.TextColor3 = (data.TotalDamage >= HEAVY_HIT_THRESHOLD) and Color3.new(1, 1, 1) or DAMAGE_COLOR
        end
        return
    end

    -- 2. Create New Indicator (Locked to Head)
    local billboard = Instance.new("BillboardGui")
    billboard.Size = UDim2.new(BASE_SIZE, 0, BASE_SIZE, 0)
    billboard.Adornee = head
    billboard.AlwaysOnTop = true
    
    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.TextStrokeColor3 = Color3.fromRGB(0, 0, 0)
    label.TextStrokeTransparency = 0
    label.Rotation = math.random(-15, 15)
    
    local total = math.abs(amount)
    label.Text = isDeath and "DEATH" or formatDamage(total)
    label.TextColor3 = isDeath and DEATH_COLOR or (total >= HEAVY_HIT_THRESHOLD and Color3.new(1, 1, 1) or DAMAGE_COLOR)
    label.Parent = billboard
    billboard.Parent = game.CoreGui

    local data = {
        Billboard = billboard,
        Label = label,
        TotalDamage = total,
        LastHitTime = tick(),
        AnimationStart = tick(),
        IsDeath = isDeath
    }
    ActiveIndicators[humanoid] = data

    -- 3. Animation Loop
    task.spawn(function()
        while tick() - data.AnimationStart < DISPLAY_TIME do
            local elapsed = tick() - data.AnimationStart
            local progress = elapsed / DISPLAY_TIME
            local isHeavy = data.TotalDamage >= HEAVY_HIT_THRESHOLD
            
            -- Safety check for deleted heads
            if not head or not head.Parent then break end

            -- Strobe Logic
            if isHeavy and not data.IsDeath then
                label.TextColor3 = (math.sin(tick() * 25) > 0) and Color3.new(1, 1, 1) or Color3.new(1, 0, 0)
            end
            
            -- Shake & Sizing
            local currentShake = data.IsDeath and (BASE_SHAKE * 3) or (isHeavy and BASE_SHAKE * 2 or BASE_SHAKE)
            local sizeMult = 1.0
            if progress < 0.25 then
                sizeMult = data.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)
            
            -- Floating & Shaking (Locked to Head via StudsOffset)
            local yOffset = 3 + (progress * 3.5)
            local shakeX = (math.random() - 0.5) * currentShake
            local shakeY = (math.random() - 0.5) * currentShake
            billboard.StudsOffset = Vector3.new(shakeX, yOffset + shakeY, 0)
            
            -- Fade
            label.TextTransparency = progress
            label.TextStrokeTransparency = progress
            
            task.wait()
        end
        billboard:Destroy()
        ActiveIndicators[humanoid] = nil
    end)
end

local function watchHumanoid(humanoid)
    local lastHealth = humanoid.Health
    humanoid.HealthChanged:Connect(function(newHealth)
        local delta = newHealth - lastHealth
        if delta <= -0.1 then
            createIndicator(humanoid, delta, (newHealth <= 0 and lastHealth > 0))
        end
        lastHealth = newHealth
    end)
end

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