-- Variables and Services
local player = game.Players.LocalPlayer
local players = game:GetService("Players")
local runService = game:GetService("RunService")
local coreGui = game:GetService("CoreGui")

-- Check if GUI already exists
if coreGui:FindFirstChild("CustomGUI") then
    coreGui:FindFirstChild("CustomGUI"):Destroy()
end

-- GUI Setup
local gui = Instance.new("ScreenGui")
gui.Name = "CustomGUI"
gui.Parent = coreGui -- Parent to CoreGui for persistence

-- Function to create a button
local function createButton(name, text, position, color)
    local button = Instance.new("TextButton")
    button.Name = name
    button.Size = UDim2.new(0, 120, 0, 30)
    button.Position = UDim2.new(unpack(position))
    button.Text = text
    button.Parent = gui
    button.BackgroundColor3 = color
    button.TextColor3 = Color3.fromRGB(255, 255, 255)
    button.Font = Enum.Font.SourceSansBold
    button.TextSize = 16
    return button
end

-- Function to create a text box
local function createTextBox(name, placeholderText, position)
    local textBox = Instance.new("TextBox")
    textBox.Name = name
    textBox.Size = UDim2.new(0, 200, 0, 30)
    textBox.Position = UDim2.new(unpack(position))
    textBox.PlaceholderText = placeholderText
    textBox.Text = ""
    textBox.Parent = gui
    textBox.BackgroundColor3 = Color3.fromRGB(255, 255, 255)
    textBox.TextColor3 = Color3.fromRGB(0, 0, 0)
    textBox.Font = Enum.Font.SourceSansBold
    textBox.TextSize = 16
    return textBox
end

-- UI Elements
local loopkillButton = createButton("LoopkillButton", "Start Loopkill", {0.9, -60, 0.3, -15}, Color3.fromRGB(255, 0, 0))
local targetBox = createTextBox("TargetBox", "Enter player name or 'all'", {0.9, -260, 0.3, -15})

-- Loopkill Logic
local loopkillEnabled = false

-- Function to teleport behind a target and point the sword towards the torso
local function teleportBehindTarget(target)
    if target and target.Character and target.Character:FindFirstChild("HumanoidRootPart") and target.Character:FindFirstChild("Humanoid") then
        local rootPart = target.Character.HumanoidRootPart
        local torso = target.Character:FindFirstChild("UpperTorso") or target.Character:FindFirstChild("Torso")
        if torso then
            local lookVector = rootPart.CFrame.LookVector
            local offset = -lookVector * 3 -- Adjust distance behind the target (3 studs)
            local targetPosition = rootPart.Position + offset

            -- Teleport the player to the calculated position
            player.Character.HumanoidRootPart.CFrame = CFrame.new(targetPosition, torso.Position) -- Pointing towards the torso
        end
    end
end

-- Function to find players by partial name or display name
local function findPlayersByPartialName(partialName)
    local matches = {}
    for _, plr in ipairs(players:GetPlayers()) do
        if plr ~= player and plr.Character and plr.Character:FindFirstChild("Humanoid") and plr.Character.Humanoid.Health > 0 then
            local name = plr.Name:lower()
            local displayName = plr.DisplayName:lower()
            if name:find(partialName) or displayName:find(partialName) then
                table.insert(matches, plr)
            end
        end
    end
    return matches
end

-- Function to get the next valid target from a list of matches
local function getNextValidTarget(matches)
    for _, target in ipairs(matches) do
        if target.Character and target.Character:FindFirstChild("Humanoid") and target.Character.Humanoid.Health > 0 then
            return target
        end
    end
    return nil
end

-- Main Loopkill toggler function
local function toggleLoopkill()
    local targetName = targetBox.Text:lower()
    loopkillEnabled = not loopkillEnabled

    if loopkillEnabled then
        loopkillButton.Text = "Stop Loopkill"
        loopkillButton.BackgroundColor3 = Color3.fromRGB(139, 0, 0) -- Dark Red

        spawn(function()
            local alreadyKilled = {} -- To keep track of players already killed
            while loopkillEnabled do
                if targetName == "all" then
                    -- Get all valid targets
                    local matches = findPlayersByPartialName("")
                    if #matches == 0 then
                        print("No valid targets remaining.")
                        break
                    end

                    local target = getNextValidTarget(matches)
                    if target then
                        while loopkillEnabled and target.Character and target.Character:FindFirstChild("Humanoid") and target.Character.Humanoid.Health > 0 do
                            teleportBehindTarget(target)
                            runService.Heartbeat:Wait()
                        end

                        if target.Character and target.Character:FindFirstChild("Humanoid") and target.Character.Humanoid.Health == 0 then
                            print("Target '" .. target.Name .. "' has been eliminated.")
                            alreadyKilled[target] = true -- Mark this target as killed
                        end
                    end
                else
                    -- Target specific player(s) by partial name
                    local matches = findPlayersByPartialName(targetName)
                    local target = getNextValidTarget(matches)
                    if target then
                        while loopkillEnabled and target.Character and target.Character:FindFirstChild("Humanoid") and target.Character.Humanoid.Health > 0 do
                            teleportBehindTarget(target)
                            runService.Heartbeat:Wait()
                        end
                    else
                        print("No valid targets matching '" .. targetName .. "'.")
                        loopkillEnabled = false
                    end
                end
            end

            -- Reset the button state when finished
            loopkillButton.Text = "Start Loopkill"
            loopkillButton.BackgroundColor3 = Color3.fromRGB(255, 0, 0) -- Bright Red
        end)
    else
        -- If stop is clicked, immediately reset loopkillEnabled and exit any ongoing loops
        loopkillEnabled = false
        loopkillButton.Text = "Start Loopkill"
        loopkillButton.BackgroundColor3 = Color3.fromRGB(255, 0, 0) -- Bright Red
    end
end

-- Connect GUI events
loopkillButton.MouseButton1Click:Connect(toggleLoopkill)




-- ============================================================
-- === HITBOXES + CLICK-TO-SELECT (ADDED SAFELY, NO CHANGES) ===
-- ============================================================

local UIS = game:GetService("UserInputService")
local camera = workspace.CurrentCamera

-- Create highlights on every player except you
local function applyHighlight(plr)
    if plr == player then return end
    if not plr.Character then return end
    if plr.Character:FindFirstChild("HighlightBox") then return end

    local hl = Instance.new("Highlight")
    hl.Name = "HighlightBox"
    hl.FillTransparency = 1
    hl.OutlineTransparency = 0
    hl.OutlineColor = Color3.fromRGB(255, 0, 0)
    hl.Parent = plr.Character
end

-- Apply highlights to existing players
for _, plr in ipairs(players:GetPlayers()) do
    if plr.Character then
        applyHighlight(plr)
    end
    plr.CharacterAdded:Connect(function()
        task.wait(0.1)
        applyHighlight(plr)
    end)
end

-- Detect clicks on hitboxes
UIS.InputEnded:Connect(function(input)
    if input.UserInputType ~= Enum.UserInputType.MouseButton1 then return end

    local mousePos = UIS:GetMouseLocation()
    local ray = camera:ViewportPointToRay(mousePos.X, mousePos.Y)
    local result = workspace:Raycast(ray.Origin, ray.Direction * 500, RaycastParams.new())

    if result and result.Instance then
        local char = result.Instance:FindFirstAncestorOfClass("Model")
        if char then
            local plr = players:GetPlayerFromCharacter(char)
            if plr and plr ~= player then
                targetBox.Text = plr.Name
                print("Selected player:", plr.Name)
            end
        end
    end
end)