local Players = game:GetService("Players")
local UserInputService = game:GetService("UserInputService")
local TweenService = game:GetService("TweenService")
local Debris = game:GetService("Debris")

local player = Players.LocalPlayer
local playerGui = player:WaitForChild("PlayerGui")

-- Variables
local humanoid, rootPart
local lastDashTime = 0
local connections = {}
local cooldownTime = 4
local isOnCooldown = false

-- Create ScreenGui
local screenGui = Instance.new("ScreenGui")
screenGui.Name = "DashGui"
screenGui.ResetOnSpawn = false
screenGui.Parent = playerGui

-- Create the Dash button (higher position)
local dashButton = Instance.new("TextButton")
dashButton.Name = "DashButton"
dashButton.Size = UDim2.new(0, 100, 0, 50)
dashButton.Position = UDim2.new(1, -110, 1, -240)  -- Higher above the Jump button
dashButton.BackgroundColor3 = Color3.fromRGB(0, 170, 255)
dashButton.TextColor3 = Color3.fromRGB(255, 255, 255)
dashButton.Text = "Dash"
dashButton.Font = Enum.Font.GothamBold
dashButton.TextSize = 24
dashButton.BorderSizePixel = 2
dashButton.BorderColor3 = Color3.fromRGB(0, 0, 0)
dashButton.BackgroundTransparency = 0.3
dashButton.Parent = screenGui

-- Update button appearance during cooldown
local function updateButton(cooldownLeft)
    if cooldownLeft > 0 then
        dashButton.Text = string.format("Dash (%.1fs)", cooldownLeft)
        dashButton.BackgroundTransparency = 0.7
        dashButton.Active = false
    else
        dashButton.Text = "Dash"
        dashButton.BackgroundTransparency = 0.3
        dashButton.Active = true
        isOnCooldown = false
    end
end

-- Setup character function
local function setupCharacter(char)
    -- Disconnect old connections
    for _, conn in ipairs(connections) do
        conn:Disconnect()
    end
    connections = {}
    
    local hum = char:WaitForChild("Humanoid")
    local rootp = char:WaitForChild("HumanoidRootPart")
    
    humanoid = hum
    rootPart = rootp
    
    -- Connect StateChanged for no fall damage (extended window for longer dash)
    local stateConn = hum.StateChanged:Connect(function(oldState, newState)
        if newState == Enum.HumanoidStateType.Landed and tick() - lastDashTime < 5 then
            hum.Health = hum.MaxHealth
        end
    end)
    table.insert(connections, stateConn)
end

-- Dash function
local function performDash()
    if isOnCooldown then return end
    
    isOnCooldown = true
    lastDashTime = tick()
    
    -- Get the direction the player is facing/moving
    local moveDirection = humanoid.MoveDirection
    if moveDirection.Magnitude == 0 then
        local camera = workspace.CurrentCamera
        moveDirection = (camera.CFrame.LookVector * Vector3.new(1, 0, 1)).Unit
    end
    
    if moveDirection.Magnitude > 0 then
        moveDirection = moveDirection.Unit
        
        -- Target position 60 studs forward (much farther!)
        local targetPosition = rootPart.Position + (moveDirection * 60)
        
        -- BodyPosition for precise, smooth dash with height hold
        local bodyPosition = Instance.new("BodyPosition")
        bodyPosition.MaxForce = Vector3.new(400000, 200000, 400000)
        bodyPosition.Position = targetPosition
        bodyPosition.P = 15000
        bodyPosition.D = 2000
        bodyPosition.Parent = rootPart
        
        -- Longer duration for epic 60-stud dash
        Debris:AddItem(bodyPosition, 0.8)
        
        -- DASH EFFECT: Trail (extended for longer dash)
        local attach0 = Instance.new("Attachment")
        attach0.Name = "DashAttach0"
        attach0.Position = Vector3.new(0, 0.5, 0.5)
        attach0.Parent = rootPart
        
        local attach1 = Instance.new("Attachment")
        attach1.Name = "DashAttach1"
        attach1.Position = Vector3.new(0, -0.5, -1.5)
        attach1.Parent = rootPart
        
        local trail = Instance.new("Trail")
        trail.Attachment0 = attach0
        trail.Attachment1 = attach1
        trail.Color = ColorSequence.new({
            ColorSequenceKeypoint.new(0, Color3.fromRGB(135, 206, 250)),
            ColorSequenceKeypoint.new(0.5, Color3.fromRGB(70, 130, 255)),
            ColorSequenceKeypoint.new(1, Color3.fromRGB(0, 100, 200))
        })
        trail.Transparency = NumberSequence.new({
            NumberSequenceKeypoint.new(0, 0.1),
            NumberSequenceKeypoint.new(0.7, 0.3),
            NumberSequenceKeypoint.new(1, 1)
        })
        trail.Lifetime = 0.8  -- Matches dash duration
        trail.MinLength = 0.1
        trail.FaceCamera = true
        trail.Parent = rootPart
        
        Debris:AddItem(trail, 1.2)
        Debris:AddItem(attach0, 1.2)
        Debris:AddItem(attach1, 1.2)
        
        -- AIR EFFECT: Particle burst (more intense for long dash)
        local effectAttach = Instance.new("Attachment")
        effectAttach.Position = Vector3.new(0, 0, -1)
        effectAttach.Parent = rootPart
        
        local pe = Instance.new("ParticleEmitter")
        pe.Texture = "rbxasset://textures/particles/smoke_main.dds"
        pe.Lifetime = NumberRange.new(0.3, 0.7)
        pe.Rate = 0
        pe.SpreadAngle = Vector2.new(90, 90)
        pe.Speed = NumberRange.new(8, 20)
        pe.VelocityInheritance = 0.4
        pe.Acceleration = Vector3.new(0, -100, 0)
        pe.Color = ColorSequence.new(Color3.fromRGB(200, 220, 255))
        pe.Transparency = NumberSequence.new({
            NumberSequenceKeypoint.new(0, 0.4),
            NumberSequenceKeypoint.new(1, 1)
        })
        pe.LightEmission = 0.3
        pe.Parent = effectAttach
        
        -- Non-blocking burst emit (more particles)
        spawn(function()
            pe:Emit(40)
            task.wait(0.15)
            pe:Emit(30)
            task.wait(0.15)
            pe:Emit(25)
            task.wait(0.2)
            pe:Emit(20)
        end)
        
        Debris:AddItem(effectAttach, 2)
    end
    
    -- Non-blocking cooldown timer
    spawn(function()
        for i = cooldownTime, 0, -0.1 do
            updateButton(i)
            task.wait(0.1)
        end
        updateButton(0)
    end)
end

-- Connect button click
dashButton.MouseButton1Click:Connect(performDash)

-- Optional: Q key to dash
UserInputService.InputBegan:Connect(function(input, gameProcessed)
    if gameProcessed then return end
    if input.KeyCode == Enum.KeyCode.Q then
        performDash()
    end
end)

-- Handle character setup
player.CharacterAdded:Connect(setupCharacter)
if player.Character then
    setupCharacter(player.Character)
end

-- Initial button state
updateButton(0)