local GPS        = require('opus.gps')
local Util       = require('opus.util')
local Point      = require('opus.point')
local Proxy      = require('core.proxy')

--[[
	Have a mob follow you. The mob's neural must have the
	neural package installed.
]]

local os = _G.os

local args = { ... }
local remoteId = args[1] or error('mobFollow REMOTE_ID')
local ni = Proxy.create(remoteId, 'device/neuralInterface')

if not ni then
	error('failed to connect')
end

local lpt = nil

while true do
	local pt = GPS.locate(2)

	if not pt then
		print('No GPS')
	else
		local gpt = Util.shallowCopy(pt)
		if pt and lpt and Point.same(pt, lpt) then
			-- havent moved
			print('no move')
		else
			if not lpt then
				gpt.x = gpt.x - 2
			else
				local dx = lpt.x - pt.x
				local dz = lpt.z - pt.z
				local angle = math.atan2(dx, dz)
				gpt.x = pt.x + 2.5 * math.sin(angle)
				gpt.z = pt.z + 2.5 * math.cos(angle)
			end
			lpt = pt
			local s, m = ni.goTo(gpt.x, gpt.y + 1, gpt.z)
			if not s then
				print(m)
			end
		end
	end

	os.sleep(.5)
end