--// Servicios
local TS = game:GetService("TweenService")
local RunService = game:GetService("RunService")
local Debris = game:GetService("Debris")
local Players = game:GetService("Players")
local CollectionService = game:GetService("CollectionService")

local LocalPlayer = Players.LocalPlayer

--// Tweens
local tweenInfoIn = TweenInfo.new(0.2, Enum.EasingStyle.Exponential, Enum.EasingDirection.Out)
local tweenInfoOut = TweenInfo.new(1.5, Enum.EasingStyle.Linear, Enum.EasingDirection.Out)
local tweenSecado = TweenInfo.new(15, Enum.EasingStyle.Quad, Enum.EasingDirection.Out)

--// Texturas (Decals)
local bloodDecals = {
	"rbxassetid://9893638760",
	"rbxassetid://9893615086",
	"rbxassetid://9893636391"
}

--// Sonidos 3D
local splatSounds = {
	"rbxassetid://9114223178", 
	"rbxassetid://9114223280", 
	"rbxassetid://9114223405"  
}
local deathSoundId = "rbxassetid://9114223553"

--// CONFIGURACIÓN
local bloodSettings = {
	Duration = 30,
	MaxDecals = 200
}

local bloodService = {}
local Pool = {}
local ActiveDrops = {}
local ActiveDecalsTrack = {}
local MAX_POOL_SIZE = 300

local newPartsFolder = workspace:FindFirstChild("BloodParticles") or Instance.new("Folder", workspace)
newPartsFolder.Name = "BloodParticles"

-------------------------------------------------------------------------------
-- UI: PANTALLA ENSANGRENTADA Y HUB
-------------------------------------------------------------------------------
local screenGui = Instance.new("ScreenGui")
screenGui.Name = "BloodScreenFX"
screenGui.ResetOnSpawn = false
if LocalPlayer then
	local pGui = LocalPlayer:FindFirstChildOfClass("PlayerGui") or LocalPlayer:WaitForChild("PlayerGui", 5)
	if pGui then screenGui.Parent = pGui end
end

local damageOverlay = Instance.new("Frame")
damageOverlay.Size = UDim2.new(1, 0, 1, 0)
damageOverlay.BackgroundColor3 = Color3.fromRGB(150, 0, 0)
damageOverlay.BackgroundTransparency = 1
damageOverlay.BorderSizePixel = 0
damageOverlay.Parent = screenGui

local function flashScreenDamage()
	damageOverlay.BackgroundTransparency = 0.65
	TS:Create(damageOverlay, TweenInfo.new(0.3), {BackgroundTransparency = 1}):Play()
end

local function createSettingsHUB()
	local buttonContainer = Instance.new("Frame")
	buttonContainer.Name = "BloodButtonContainer"
	buttonContainer.Size = UDim2.new(0, 150, 0, 35)
	buttonContainer.Position = UDim2.new(0, 15, 0.5, -17)
	buttonContainer.BackgroundTransparency = 1
	buttonContainer.Parent = screenGui

	local toggleBtn = Instance.new("TextButton")
	toggleBtn.Name = "BloodMenuToggle"
	toggleBtn.Size = UDim2.new(1, -25, 1, 0)
	toggleBtn.Position = UDim2.new(0, 0, 0, 0)
	toggleBtn.BackgroundColor3 = Color3.fromRGB(100, 10, 10)
	toggleBtn.TextColor3 = Color3.fromRGB(255, 255, 255)
	toggleBtn.Text = "🩸 Sangre: 30s"
	toggleBtn.Font = Enum.Font.SourceSansBold
	toggleBtn.TextSize = 14
	toggleBtn.Parent = buttonContainer
	
	local toggleUICorner = Instance.new("UICorner")
	toggleUICorner.CornerRadius = UDim.new(0, 8)
	toggleUICorner.Parent = toggleBtn

	local hubFrame = Instance.new("Frame")
	hubFrame.Name = "BloodHUB"
	hubFrame.Size = UDim2.new(0, 160, 0, 240)
	hubFrame.Position = UDim2.new(0, 175, 0.5, -120)
	hubFrame.BackgroundColor3 = Color3.fromRGB(25, 25, 25)
	hubFrame.BackgroundTransparency = 0.1
	hubFrame.Visible = false
	hubFrame.Parent = screenGui

	local closeBtn = Instance.new("TextButton")
	closeBtn.Name = "CloseUI"
	closeBtn.Size = UDim2.new(0, 20, 0, 35)
	closeBtn.Position = UDim2.new(1, -20, 0, 0)
	closeBtn.BackgroundColor3 = Color3.fromRGB(180, 30, 30)
	closeBtn.TextColor3 = Color3.fromRGB(255, 255, 255)
	closeBtn.Text = "X"
	closeBtn.Font = Enum.Font.SourceSansBold
	closeBtn.TextSize = 14
	closeBtn.Parent = buttonContainer

	local closeCorner = Instance.new("UICorner")
	closeCorner.CornerRadius = UDim.new(0, 8)
	closeCorner.Parent = closeBtn

	closeBtn.MouseButton1Click:Connect(function()
		buttonContainer.Visible = false
		hubFrame.Visible = false
	end)

	local hubUICorner = Instance.new("UICorner")
	hubUICorner.CornerRadius = UDim.new(0, 8)
	hubUICorner.Parent = hubFrame

	local title = Instance.new("TextLabel")
	title.Size = UDim2.new(1, 0, 0, 30)
	title.BackgroundTransparency = 1
	title.Text = "Duración de Sangre"
	title.TextColor3 = Color3.fromRGB(255, 255, 255)
	title.Font = Enum.Font.SourceSansBold
	title.TextSize = 14
	title.Parent = hubFrame

	local listLayout = Instance.new("UIListLayout")
	listLayout.Padding = UDim.new(0, 5)
	listLayout.HorizontalAlignment = Enum.HorizontalAlignment.Center
	listLayout.SortOrder = Enum.SortOrder.LayoutOrder
	listLayout.Parent = hubFrame
	title.LayoutOrder = 0

	local timeOptions = {
		{text = "30 Segundos", time = 30, maxDecals = 200},
		{text = "1 Minuto", time = 60, maxDecals = 200},
		{text = "2 Minutos", time = 120, maxDecals = 200},
		{text = "3 Minutos", time = 180, maxDecals = 200},
		{text = "4 Minutos", time = 240, maxDecals = 200},
		{text = "5 Minutos", time = 300, maxDecals = 400}
	}

	local buttons = {}
	for i, option in ipairs(timeOptions) do
		local btn = Instance.new("TextButton")
		btn.Size = UDim2.new(0.9, 0, 0, 28)
		btn.LayoutOrder = i
		btn.Text = option.text
		btn.Font = Enum.Font.SourceSans
		btn.TextSize = 13
		btn.Parent = hubFrame

		local btnCorner = Instance.new("UICorner")
		btnCorner.CornerRadius = UDim.new(0, 5)
		btnCorner.Parent = btn

		local function updateVisuals()
			for _, bData in ipairs(buttons) do
				if bData.time == bloodSettings.Duration then
					bData.button.BackgroundColor3 = Color3.fromRGB(180, 20, 20)
					bData.button.TextColor3 = Color3.fromRGB(255, 255, 255)
				else
					bData.button.BackgroundColor3 = Color3.fromRGB(45, 45, 45)
					bData.button.TextColor3 = Color3.fromRGB(200, 200, 200)
				end
			end
			toggleBtn.Text = "🩸 Sangre: " .. (bloodSettings.Duration >= 60 and (bloodSettings.Duration / 60 .. "m") or (bloodSettings.Duration .. "s"))
		end

		btn.MouseButton1Click:Connect(function()
			bloodSettings.Duration = option.time
			bloodSettings.MaxDecals = option.maxDecals
			updateVisuals()
		end)
		table.insert(buttons, {button = btn, time = option.time})
	end

	for _, bData in ipairs(buttons) do
		if bData.time == bloodSettings.Duration then
			bData.button.BackgroundColor3 = Color3.fromRGB(180, 20, 20)
			bData.button.TextColor3 = Color3.fromRGB(255, 255, 255)
		else
			bData.button.BackgroundColor3 = Color3.fromRGB(45, 45, 45)
			bData.button.TextColor3 = Color3.fromRGB(200, 200, 200)
		end
	end

	toggleBtn.MouseButton1Click:Connect(function()
		hubFrame.Visible = not hubFrame.Visible
	end)
end

createSettingsHUB()

-------------------------------------------------------------------------------
-- POOLING & CREACIÓN DE PIEZAS
-------------------------------------------------------------------------------
function createPart(): Part
	local p: Part = Instance.new("Part")
	p.Name = "BlPart"
	p.Shape = Enum.PartType.Block 
	p.Size = Vector3.new(0.2, 0.2, 0.2)
	p.Transparency = 1
	p.CanCollide = false
	p.Massless = true
	p.Material = Enum.Material.SmoothPlastic
	p.Anchored = false
	p.CastShadow = false

	local decal = Instance.new("Decal")
	decal.Name = "Splatter"
	decal.Face = Enum.NormalId.Top
	decal.Transparency = 1
	decal.Parent = p
	
	local bgui = Instance.new("BillboardGui")
	bgui.Name = "FlyingImage"
	bgui.Size = UDim2.new(2.8, 0, 2.8, 0)
	bgui.AlwaysOnTop = true
	bgui.LightInfluence = 0.5
	bgui.Parent = p
	
	local img = Instance.new("ImageLabel")
	img.Name = "Img"
	img.Size = UDim2.new(1, 0, 1, 0)
	img.BackgroundTransparency = 1
	img.Parent = bgui

	return p
end

local function GetPart()
	if #Pool > 0 then
		return table.remove(Pool)
	end
	return createPart()
end

local function ReturnPart(part: Part)
	if not part then return end

	ActiveDrops[part] = nil
	part.Anchored = false
	part.Transparency = 1
	part.CanCollide = false
	part.Massless = true
	part.Parent = nil
	part.Size = Vector3.new(0.2, 0.2, 0.2)
	part.AssemblyLinearVelocity = Vector3.zero
	part.AssemblyAngularVelocity = Vector3.zero

	-- Limpieza estricta de soldaduras (WeldConstraints)
	for _, child in ipairs(part:GetChildren()) do
		if child:IsA("WeldConstraint") then
			child:Destroy()
		end
	end

	local decal = part:FindFirstChild("Splatter")
	if decal then
		decal.Transparency = 1
		decal.Color3 = Color3.new(1, 1, 1)
	end
	
	local bgui = part:FindFirstChild("FlyingImage")
	if bgui then bgui.Enabled = false end

	for _, tag in ipairs(CollectionService:GetTags(part)) do
		CollectionService:RemoveTag(part, tag)
	end

	if #Pool < MAX_POOL_SIZE then
		table.insert(Pool, part)
	else
		part:Destroy()
	end
end

local function RegisterNewDecal(part: Part)
	for i, p in ipairs(ActiveDecalsTrack) do
		if p == part then return end
	end
	
	table.insert(ActiveDecalsTrack, part)
	
	if #ActiveDecalsTrack > bloodSettings.MaxDecals then
		local oldestPart = table.remove(ActiveDecalsTrack, 1)
		if oldestPart and oldestPart.Parent then
			ReturnPart(oldestPart)
		end
	end
end

-------------------------------------------------------------------------------
-- EFECTOS VISUALES EXTRA
-------------------------------------------------------------------------------
local function playSplatSound(position: Vector3)
	local soundPart = Instance.new("Part")
	soundPart.Size = Vector3.new(0.1, 0.1, 0.1)
	soundPart.Position = position
	soundPart.Anchored = true
	soundPart.Transparency = 1
	soundPart.CanCollide = false
	soundPart.Parent = workspace

	local sound = Instance.new("Sound")
	sound.SoundId = splatSounds[math.random(1, #splatSounds)]
	sound.Volume = 0.7
	sound.RollOffMaxDistance = 60
	sound.Parent = soundPart
	sound:Play()

	Debris:AddItem(soundPart, 1.5)
end

local function createBloodMist(position: Vector3)
	local mistPart = Instance.new("Part")
	mistPart.Size = Vector3.new(0.1, 0.1, 0.1)
	mistPart.Position = position
	mistPart.Anchored = true
	mistPart.Transparency = 1
	mistPart.CanCollide = false
	mistPart.Parent = newPartsFolder

	local pe = Instance.new("ParticleEmitter")
	pe.Color = ColorSequence.new(Color3.fromRGB(80 , 0, 0)) 
	pe.Size = NumberSequence.new({NumberSequenceKeypoint.new(0, 1.5), NumberSequenceKeypoint.new(1, 5.0)})
	pe.Texture = "rbxassetid://243664672" 
	pe.Transparency = NumberSequence.new({NumberSequenceKeypoint.new(0, 0.4), NumberSequenceKeypoint.new(1, 1)})
	pe.Lifetime = NumberRange.new(0.3, 0.6)
	pe.Rate = 0
	pe.Speed = NumberRange.new(3, 8)
	pe.SpreadAngle = Vector2.new(180, 180)
	pe.Parent = mistPart

	pe:Emit(10)
	Debris:AddItem(mistPart, 1)
end

-------------------------------------------------------------------------------
-- BUCLE PRINCIPAL DE FÍSICA Y DETECCIÓN PRECISA DE IMPACTO
-------------------------------------------------------------------------------
RunService.Heartbeat:Connect(function(dt)
	for part, data in pairs(ActiveDrops) do
		if not part or not part.Parent then
			ActiveDrops[part] = nil
			continue
		end

		local currentPos = part.Position
		local displacement = currentPos - data.lastPos
		local dist = displacement.Magnitude

		if dist > 0.001 then
			local raycast = workspace:Raycast(data.lastPos, displacement, data.params)
			if raycast then
				data:Impact(raycast)
				ActiveDrops[part] = nil
			else
				data.lastPos = currentPos
			end
		end

		-- FAILSAFE: Si la gota se atora en el aire (velocidad 0 y sin impactar nada)
		if ActiveDrops[part] and part.AssemblyLinearVelocity.Magnitude < 0.1 then
			-- Chequeo final hacia abajo
			local downRay = workspace:Raycast(part.Position, Vector3.new(0, -1, 0), data.params)
			if downRay then 
				data:Impact(downRay) 
			else
				-- Si de verdad se quedó flotando por un bug de Roblox, la reciclamos en vez de dejarla ahí
				ReturnPart(part)
			end
			ActiveDrops[part] = nil
		end
	end
end)

-------------------------------------------------------------------------------
-- FUNCIÓN PRINCIPAL DE SANGRE
-------------------------------------------------------------------------------
function bloodService.CreateBlood(anchorPart: BasePart, parent, rate, particles, hitDirection)
	if not anchorPart or not anchorPart:IsA("BasePart") or not particles then return end

	local excluded = {parent, newPartsFolder}
	for _, plyr in ipairs(Players:GetPlayers()) do
		if plyr.Character then table.insert(excluded, plyr.Character) end
	end

	local rayParams = RaycastParams.new()
	rayParams.FilterType = Enum.RaycastFilterType.Exclude
	rayParams.FilterDescendantsInstances = excluded
	rayParams.IgnoreWater = true
	rayParams.RespectCanCollide = true

	local rng = Random.new()
	createBloodMist(anchorPart.Position)

	for i = 1, particles do
		local baseDir = hitDirection or (-anchorPart.CFrame.LookVector + Vector3.new(0, 0.5, 0))
		if baseDir.Magnitude < 0.01 then baseDir = Vector3.new(0, 1, 0) end

		local speed = rng:NextNumber(15, 40)
		local spread = Vector3.new(rng:NextNumber(-8, 8), rng:NextNumber(-2, 10), rng:NextNumber(-8, 8))
		local velocity = (baseDir.Unit * speed) + spread

		local bloodDrop: Part = GetPart()
		bloodDrop.Parent = newPartsFolder
		local startPos = anchorPart.Position + Vector3.new(0, 0.3, 0)
		bloodDrop.CFrame = CFrame.new(startPos)
		bloodDrop.AssemblyLinearVelocity = velocity

		local randomTextureId = bloodDecals[rng:NextInteger(1, #bloodDecals)]

		local decal = bloodDrop:FindFirstChild("Splatter")
		if decal then
			decal.Texture = randomTextureId
			decal.Color3 = Color3.new(1, 1, 1)
		end
		
		local bgui = bloodDrop:FindFirstChild("FlyingImage")
		if bgui then
			bgui.Enabled = true
			local img = bgui:FindFirstChild("Img")
			if img then 
				img.Image = randomTextureId 
				img.ImageColor3 = Color3.new(1, 1, 1)
			end
		end

		ActiveDrops[bloodDrop] = {
			part = bloodDrop,
			lastPos = startPos,
			params = rayParams,

			Impact = function(self, raycast)
				local part = self.part
				local hitPart = raycast.Instance
				
				if not part or not part.Parent then return end
				if not hitPart or not hitPart:IsA("BasePart") then 
					ReturnPart(part) 
					return 
				end

				-- FAILSAFE: Ignorar barreras completamente invisibles (Hitboxes, Triggers)
				if hitPart.Transparency >= 1 and hitPart.Name ~= "HumanoidRootPart" then
					ReturnPart(part)
					return
				end

				playSplatSound(raycast.Position)

				local sizeX = rng:NextNumber(5.0, 9.0)
				local sizeZ = rng:NextNumber(3.5, 7.0)

				-- YA NO SE ANCLA: Lo preparamos para ser soldado al objeto dinámico
				part.Anchored = false 
				part.CanCollide = false
				part.Massless = true
				part.Transparency = 1 

				local bguiChild = part:FindFirstChild("FlyingImage")
				if bguiChild then bguiChild.Enabled = false end

				local decalChild = part:FindFirstChild("Splatter")
				if decalChild then decalChild.Transparency = 0 end

				part.CFrame = CFrame.lookAt(raycast.Position, raycast.Position + raycast.Normal)
					* CFrame.Angles(math.rad(-90), 0, 0)
					* CFrame.Angles(0, rng:NextNumber(0, math.pi * 2), 0)

				-- SISTEMA DE WELDING: Pega la sangre al objeto/NPC que se está moviendo
				local weld = Instance.new("WeldConstraint")
				weld.Name = "BloodWeld"
				weld.Part0 = part
				weld.Part1 = hitPart
				weld.Parent = part

				TS:Create(part, tweenInfoIn, { Size = Vector3.new(sizeX, 0.05, sizeZ) }):Play()

				if decalChild then
					TS:Create(decalChild, tweenSecado, { Color3 = Color3.fromRGB(150, 150, 150) }):Play()
				end

				-- (Se retiró el efecto de que la sangre resbale hacia abajo porque causaba inestabilidad con los Welds de los NPCs en movimiento)

				RegisterNewDecal(part)

				task.delay(bloodSettings.Duration, function()
					if not part or not part.Parent then return end
					if decalChild then
						local tween = TS:Create(decalChild, tweenInfoOut, {Transparency = 1})
						tween:Play()
						tween.Completed:Wait()
					end
					ReturnPart(part)
				end)
			end
		}

		task.delay(3, function()
			if bloodDrop and ActiveDrops[bloodDrop] then ReturnPart(bloodDrop) end
		end)

		if rate and rate >= 0 then task.wait(rate) end
	end
end

-------------------------------------------------------------------------------
-- CHARCO PROGRESIVO EN CADÁVERES
-------------------------------------------------------------------------------
local function createBodyPool(char: Model)
	local root = char.PrimaryPart or char:FindFirstChild("HumanoidRootPart") or char:FindFirstChild("Torso")
	if not root then return end

	local rayParams = RaycastParams.new()
	rayParams.FilterType = Enum.RaycastFilterType.Exclude
	rayParams.FilterDescendantsInstances = {char, newPartsFolder}
	rayParams.RespectCanCollide = true

	local raycast = workspace:Raycast(root.Position, Vector3.new(0, -8, 0), rayParams)
	if not raycast then return end
	
	local hitPart = raycast.Instance
	if not hitPart or hitPart.Transparency >= 1 then return end

	local poolPart = Instance.new("Part")
	poolPart.Name = "BloodPool"
	poolPart.Size = Vector3.new(0.2, 0.05, 0.2)
	poolPart.Anchored = false -- Preparado para soldadura (útil si mueren en un elevador móvil)
	poolPart.CanCollide = false
	poolPart.Massless = true
	poolPart.Transparency = 1
	poolPart.CFrame = CFrame.lookAt(raycast.Position, raycast.Position + raycast.Normal) * CFrame.Angles(math.rad(-90), 0, 0)
	poolPart.Parent = newPartsFolder
	
	-- Soldar el charco también por si el suelo resulta ser algo que se mueve
	local weld = Instance.new("WeldConstraint")
	weld.Part0 = poolPart
	weld.Part1 = hitPart
	weld.Parent = poolPart

	local decal = Instance.new("Decal")
	decal.Texture = bloodDecals[1]
	decal.Face = Enum.NormalId.Top
	decal.Color3 = Color3.new(1, 1, 1)
	decal.Parent = poolPart

	local targetSize = math.random(8, 15)
	TS:Create(poolPart, TweenInfo.new(3, Enum.EasingStyle.Sine, Enum.EasingDirection.Out), {
		Size = Vector3.new(targetSize, 0.05, targetSize)
	}):Play()
	TS:Create(decal, tweenSecado, { Color3 = Color3.fromRGB(150, 150, 150) }):Play()

	RegisterNewDecal(poolPart)

	task.delay(bloodSettings.Duration, function()
		if poolPart and poolPart.Parent then
			local tw = TS:Create(decal, tweenInfoOut, {Transparency = 1})
			tw:Play()
			tw.Completed:Wait()
			poolPart:Destroy()
		end
	end)
end

-------------------------------------------------------------------------------
-- REGISTRO DE ENTIDADES (JUGADORES Y NPCS)
-------------------------------------------------------------------------------
function registerCharacter(character: Model)
	if CollectionService:HasTag(character, "BloodSystemRegistered") then return end
	CollectionService:AddTag(character, "BloodSystemRegistered")

	local hum: Humanoid = character:FindFirstChildOfClass("Humanoid") or character:WaitForChild("Humanoid", 3)
	if not hum then return end

	hum:SetAttribute("OldHealth", hum.Health)

	hum.HealthChanged:Connect(function(newHealth)
		local oldHealth = hum:GetAttribute("OldHealth")

		if oldHealth and oldHealth > newHealth then
			if LocalPlayer and LocalPlayer.Character == character then
				flashScreenDamage()
			end
			pcall(function()
				bloodService.CreateBlood(character.PrimaryPart or character:FindFirstChild("HumanoidRootPart") or character:FindFirstChild("Torso"), character, 0, 2)
			end)
		end
		hum:SetAttribute("OldHealth", newHealth)
	end)

	hum.Died:Connect(function()
		local soundPart = Instance.new("Part")
		soundPart.Position = character:GetPivot().Position
		soundPart.Anchored = true soundPart.Transparency = 1 soundPart.Parent = workspace
		local s = Instance.new("Sound") s.SoundId = deathSoundId s.Volume = 1 s.Parent = soundPart s:Play()
		Debris:AddItem(soundPart, 2)

		task.spawn(function()
			local head = character:FindFirstChild("Head") or character.PrimaryPart
			if head then
				for burst = 1, 3 do
					bloodService.CreateBlood(head, character, 0, 2)
					task.wait(0.12)
				end
			end
		end)
		task.delay(0.4, function() createBodyPool(character) end)
	end)
end

function registerPlayer(player: Player)
	if CollectionService:HasTag(player, "BloodPlayerReg") then return end
	CollectionService:AddTag(player, "BloodPlayerReg")
	
	if player.Character then registerCharacter(player.Character) end
	player.CharacterAdded:Connect(registerCharacter)
end

for _, currentPlayer in pairs(Players:GetPlayers()) do registerPlayer(currentPlayer) end
Players.PlayerAdded:Connect(registerPlayer)

workspace.DescendantAdded:Connect(function(descendant)
	if descendant:IsA("Humanoid") then
		local charModel = descendant.Parent
		if charModel and charModel:IsA("Model") then
			registerCharacter(charModel)
		end
	end
end)

for _, obj in ipairs(workspace:GetDescendants()) do
	if obj:IsA("Humanoid") and obj.Parent and obj.Parent:IsA("Model") then
		registerCharacter(obj.Parent)
	end
end