-- DEBUG
xp = function(self)
	local p = self.object:getpos()
	p.x = p.x + 5
	self.moveto(self, p, 1, function(self)
		zm(self)
	end)
end
xm = function(self)
	local p = self.object:getpos()
	p.x = p.x - 5
	p.y = p.y + 1
	self.moveto(self, p, 2, function(self)
		zp(self)
	end)
end
zp = function(self)
	local p = self.object:getpos()
	p.z = p.z + 5
	p.y = p.y - 1
	self.moveto(self, p, 3, function(self)
		xp(self)
	end)
end
zm = function(self)
	local p = self.object:getpos()
	p.z = p.z - 5
	self.moveto(self, p, 4, function(self)
		xm(self)
	end)
end
-- END DEBUG

minetest.register_entity("town_worker:worker", {
	hp_max = 1,
	physical = false,
	collisionbox = {-0.4, -1, -0.4, 0.4, 1, 0.4},
	visual = "upright_sprite",
	visual_size = {x=1, y=2},
	textures = {"player.png", "player_back.png"},
	makes_footstep_sound = true,
	
	target = nil,
	speed = nil,
	after = nil,
	
	on_activate = function(self, staticdata, dtime_s)
		
	end,
	
	on_step = function(self, dtime)
		if self.target and self.speed then
			local s = self.object:getpos()
			local t = self.target
			local diff = {x=t.x-s.x, y=t.y-s.y, z=t.z-s.z}
			
			local yaw = math.atan(diff.z/diff.x)+math.pi/2
			if diff.z ~= 0 or diff.x > 0 then
				yaw = yaw+math.pi
			end
			self.object:setyaw(yaw)
			
			local amount = (diff.x^2+diff.y^2+diff.z^2)^0.5
			local v = self.speed
			local vec = {x=0, y=0, z=0}
			vec.x = diff.x*v/amount
			vec.y = diff.y*v/amount
			vec.z = diff.z*v/amount
			self.object:setvelocity(vec)
			
			if math.abs(diff.x) < 0.1 and math.abs(diff.y) < 0.1 and math.abs(diff.z) < 0.1 then
				self.object:setvelocity({x=0, y=0, z=0})
				self.target = nil
				self.speed = nil
				if self.after then
					self.after(self)
				end
			end
		end
	end,
	
	on_punch = function(self, hitter)
		
	end,
	
	on_rightclick = function(self, clicker)
		-- xp(self) -- DEBUG: calling this causes the NPC walk in a square
	end,
	
	get_staticdata = function(self)
		
	end,
	
	-- API
	moveto = function(self, pos, speed, after)
		self.target = pos
		self.speed = speed
		self.after = after
	end
})