How Do I Add More To This Neighbor AI?

How Would I Add A Raycasting Function Where The Neighbor Will Only Chase A Player If He Sees One Infront Of Him And Can Exclude Any Transparent Objects, While Using Path Finding To Help Him Get To The Player, But He Stops Chasing After 7 Seconds? Here is the script I have:

local larm = script.Parent:FindFirstChild("HumanoidRootPart")
local rarm = script.Parent:FindFirstChild("HumanoidRootPart")

function findNearestTorso(pos)
	local list = game.Workspace:children()
	local torso = nil
	local dist = 170
	local temp = nil
	local human = nil
	local temp2 = nil
	for x = 1, #list do
		temp2 = list[x]
		if (temp2.className == "Model") and (temp2 ~= script.Parent) then
			temp = temp2:findFirstChild("HumanoidRootPart")
			human = temp2:findFirstChild("Humanoid")
			if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
				if (temp.Position - pos).magnitude < dist then
					torso = temp
					dist = (temp.Position - pos).magnitude
				end
			end
		end
	end
	return torso
end




while true do
	wait(math.random(1,2))
	local target = findNearestTorso(script.Parent.HumanoidRootPart.Position)
	if target ~= nil then
		script.Parent.Humanoid:MoveTo(target.Position)
		if script.Parent.Randomizer.Value == 1 then
			if script.Parent.UpperTorso.Sound.IsPlaying == false then
			script.Parent.UpperTorso.Sound:Play()
			else
				
			end
		else
			if script.Parent.UpperTorso.Sound2.IsPlaying == false then
			script.Parent.UpperTorso.Sound2:Play()
			else
				
			end
		end
	else
		script.Parent.UpperTorso.Sound:Stop()
		script.Parent.UpperTorso.Sound2:Stop()
	end

end