local Workspace = game:GetService("Workspace")
local Players = game:GetService("Players")
local LocalPlayer = Players.LocalPlayer
local Camera = Workspace.CurrentCamera
local olds

-- FOV 设置
local FOV_Circle = Drawing.new("Circle")
FOV_Circle.Visible = true
FOV_Circle.Radius = 60  -- FOV 大小（角度单位，非像素）
FOV_Circle.Color = Color3.fromRGB(255, 255, 255)
FOV_Circle.Thickness = 1
FOV_Circle.Transparency = 1
FOV_Circle.Filled = false
FOV_Circle.Position = Vector2.new(Camera.ViewportSize.X / 2, Camera.ViewportSize.Y / 2)

-- 当屏幕大小变化时调整 FOV 位置
Camera:GetPropertyChangedSignal("ViewportSize"):Connect(function()
    FOV_Circle.Position = Vector2.new(Camera.ViewportSize.X / 2, Camera.ViewportSize.Y / 2)
end)

local function getClosestHead()
    local closestHead
    local closestDistance = math.huge
    local cameraDirection = Camera.CFrame.LookVector
    local cameraPos = Camera.CFrame.Position
    
    for _, player in ipairs(Players:GetPlayers()) do
        if player ~= LocalPlayer and player.Character then
            local character = player.Character
            local head = character:FindFirstChild("Head")
            local humanoid = character:FindFirstChildOfClass("Humanoid")
            local forcefield = character:FindFirstChild("ForceField")
            
            if head and humanoid and not forcefield and humanoid.Health > 0 then
                local directionToHead = (head.Position - cameraPos).Unit
                local angle = math.deg(math.acos(cameraDirection:Dot(directionToHead)))
                
                -- 检查目标是否在 FOV 范围内（角度判定）
                if angle <= FOV_Circle.Radius then
                    local distance = (head.Position - cameraPos).Magnitude
                    if distance < closestDistance then
                        closestHead = head
                        closestDistance = distance
                    end
                end
            end
        end
    end
    
    return closestHead
end

-- 仅拦截来自 LocalPlayer 的 Raycast 调用（避免影响摄像机）
old = hookmetamethod(game, "__namecall", function(self, ...)
    local method = getnamecallmethod()
    local args = {...}
    
    -- 仅当调用者是 LocalPlayer 时才修改 Raycast
    if (method == "Raycast" or method == "FindPartOnRay") and not checkcaller() and self == Workspace then
        local origin, direction
        if method == "Raycast" then
            origin = args[1]
            direction = args[2]
        else
            local ray = args[1]
            if typeof(ray) == "Ray" then
                origin = ray.Origin
                direction = ray.Direction
            end
        end
        
        if origin and direction then
            local closestHead = getClosestHead()
            if closestHead then
                return {
                    Instance = closestHead,
                    Position = closestHead.Position,
                    Normal = (closestHead.Position - origin).Unit,
                    Material = Enum.Material.Plastic
                }
            end
        end
    end
    
    return old(self, ...)
end)