--// Services
local Players = game:GetService("Players")
local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")
local Workspace = game:GetService("Workspace")

--// Local Player and Camera
local localPlayer = Players.LocalPlayer
local camera = Workspace.CurrentCamera

--// Settings
local FOV_RADIUS = 150
local AIMLOCK_KEY = Enum.UserInputType.MouseButton2
local IGNORE_LIST = {localPlayer.Character, camera}

--// FOV Circle
local fovCircle = Drawing.new("Circle")
fovCircle.Position = Vector2.new(camera.ViewportSize.X / 2, camera.ViewportSize.Y / 2)
fovCircle.Radius = FOV_RADIUS
fovCircle.Color = Color3.fromRGB(255, 0, 0)
fovCircle.Thickness = 2
fovCircle.Transparency = 0.5
fovCircle.Visible = true

--// Aimlock State
local aimlockHeld = false

--// Helper: Team Check
local function isEnemy(player)
    if localPlayer.Team == nil or player.Team == nil then return true end
    return player.Team ~= localPlayer.Team
end

--// Helper: Wall Check
local function hasLineOfSight(targetPart)
    local origin = camera.CFrame.Position
    local direction = (targetPart.Position - origin).Unit * (targetPart.Position - origin).Magnitude
    local raycastParams = RaycastParams.new()
    raycastParams.FilterDescendantsInstances = IGNORE_LIST
    raycastParams.FilterType = Enum.RaycastFilterType.Blacklist
    local result = Workspace:Raycast(origin, direction, raycastParams)
    return not result or result.Instance:IsDescendantOf(targetPart.Parent)
end

--// Helper: Get Closest Valid Player in FOV
local function getClosestPlayer()
    local closestPlayer = nil
    local shortestDistance = FOV_RADIUS

    for _, player in pairs(Players:GetPlayers()) do
        if player ~= localPlayer and player.Character and player.Character:FindFirstChild("Head") and isEnemy(player) then
            local head = player.Character.Head
            local screenPos, onScreen = camera:WorldToViewportPoint(head.Position)
            if onScreen then
                local distance = (Vector2.new(screenPos.X, screenPos.Y) - fovCircle.Position).Magnitude
                if distance < shortestDistance and hasLineOfSight(head) then
                    shortestDistance = distance
                    closestPlayer = player
                end
            end
        end
    end

    return closestPlayer
end

--// Input Handling
UserInputService.InputBegan:Connect(function(input, gameProcessed)
    if input.UserInputType == AIMLOCK_KEY then
        aimlockHeld = true
    end
end)

UserInputService.InputEnded:Connect(function(input, gameProcessed)
    if input.UserInputType == AIMLOCK_KEY then
        aimlockHeld = false
    end
end)

--// Main Loop (Pure Lock-On)
RunService.RenderStepped:Connect(function()
    if aimlockHeld then
        local targetPlayer = getClosestPlayer()
        if targetPlayer and targetPlayer.Character then
            local head = targetPlayer.Character:FindFirstChild("Head")
            if head then
                camera.CFrame = CFrame.new(camera.CFrame.Position, head.Position)
            end
        end
    end
end)