local U = require "scriptbank\\utillib"
local lightNum = {}
local attachTo = {}
attachLightToMe = {}
function light_npc_init(e)
  lightNum[e] = GetEntityLightNumber(e)--change 2 to the entity number of the light
	--change 'nil' to the entity number of the npc
	--or place the light next to entity for automatic assignment
	--*make sure entity has 'attachLightToMe[e] = e' in the script*
	attachTo[e] = nil 
end
function light_npc_main(e)
	if attachTo[e] == nil then 
		local x1,y1,z1 = GetLightPosition(lightNum[e])
		local dist1 = 999999
		for a,_ in pairs (attachLightToMe) do 
			local x2,y2,z2 = GetEntityPosAng(a)
			local dist2 = sqrd(x1,z1,x2,z2)
			if dist2 < dist1 then 
				attachTo[e] = a 
				dist1 = dist2
			end 
		end
		if attachTo[e] == nil then 
			attachTo[e] = -1
		end 
	else 
		if attachTo[e] == -1 then 
			return 
		end
		local x, y, z, Ax, Ay, Az = GetEntityPosAng(attachTo[e])
		SetLightPosition ( lightNum[e], x, y+250, z )
	end 
end 

function sqrd( x1, z1, x2, z2 )
	local dx, dz = x1 - x2, z1 - z2
	return dx*dx+dz*dz
end