technic/technic/machines/other/frames.lua

local S = technic.getter

frames = {}

local infinite_stacks = minetest.setting_getbool("creative_mode") and minetest.get_modpath("unified_inventory") == nil

local frames_pos = {}

-- Helpers

local function get_face(pos,ppos,pvect)
	-- Raytracer to get which face has been clicked
	ppos={x=ppos.x-pos.x,y=ppos.y-pos.y+1.5,z=ppos.z-pos.z}
	if pvect.x>0 then
		local t=(-0.5-ppos.x)/pvect.x
		local y_int=ppos.y+t*pvect.y
		local z_int=ppos.z+t*pvect.z
		if y_int>-0.45 and y_int<0.45 and z_int>-0.45 and z_int<0.45 then return 1 end 
	elseif pvect.x<0 then
		local t=(0.5-ppos.x)/pvect.x
		local y_int=ppos.y+t*pvect.y
		local z_int=ppos.z+t*pvect.z
		if y_int>-0.45 and y_int<0.45 and z_int>-0.45 and z_int<0.45 then return 2 end 
	end
	if pvect.y>0 then
		local t=(-0.5-ppos.y)/pvect.y
		local x_int=ppos.x+t*pvect.x
		local z_int=ppos.z+t*pvect.z
		if x_int>-0.45 and x_int<0.45 and z_int>-0.45 and z_int<0.45 then return 3 end 
	elseif pvect.y<0 then
		local t=(0.5-ppos.y)/pvect.y
		local x_int=ppos.x+t*pvect.x
		local z_int=ppos.z+t*pvect.z
		if x_int>-0.45 and x_int<0.45 and z_int>-0.45 and z_int<0.45 then return 4 end 
	end
	if pvect.z>0 then
		local t=(-0.5-ppos.z)/pvect.z
		local x_int=ppos.x+t*pvect.x
		local y_int=ppos.y+t*pvect.y
		if x_int>-0.45 and x_int<0.45 and y_int>-0.45 and y_int<0.45 then return 5 end 
	elseif pvect.z<0 then
		local t=(0.5-ppos.z)/pvect.z
		local x_int=ppos.x+t*pvect.x
		local y_int=ppos.y+t*pvect.y
		if x_int>-0.45 and x_int<0.45 and y_int>-0.45 and y_int<0.45 then return 6 end 
	end
end

local function lines(str)
	local t = {}
	local function helper(line) table.insert(t, line) return "" end
	helper((str:gsub("(.-)\r?\n", helper)))
	return t
end

local function pos_to_string(pos)
	if pos.x == 0 then pos.x = 0 end -- Fix for signed 0
	if pos.y == 0 then pos.y = 0 end -- Fix for signed 0
	if pos.z == 0 then pos.z = 0 end -- Fix for signed 0
	return tostring(pos.x).."\n"..tostring(pos.y).."\n"..tostring(pos.z)
end

local function pos_from_string(str)
	local l = lines(str)
	return {x = tonumber(l[1]), y = tonumber(l[2]), z = tonumber(l[3])}
end

local function pos_in_list(l,pos)
	for _,p in ipairs(l) do
		if p.x==pos.x and p.y==pos.y and p.z==pos.z then return true end
	end
	return false
end

local function table_empty(table)
	for _, __ in pairs(table) do
		return false
	end
	return true
end

local function add_table(table,toadd)
	local i = 1
	while true do
		o = table[i]
		if o == toadd then return end
		if o == nil then break end
		i = i+1
	end
	table[i] = toadd
end

local function move_nodes_vect(poslist,vect,must_not_move,owner)
	if minetest.is_protected then
		for _,pos in ipairs(poslist) do
			local npos=vector.add(pos,vect)
			if minetest.is_protected(pos, owner) or minetest.is_protected(npos, owner) then
				return
			end
		end
	end
	for _,pos in ipairs(poslist) do
		local npos=vector.add(pos,vect)
		local name = minetest.get_node(npos).name
		if ((name~="air" and minetest.registered_nodes[name].liquidtype=="none") or frames_pos[pos_to_string(npos)]) and not(pos_in_list(poslist,npos)) then
			return
		end
		--[[if pos.x==must_not_move.x and pos.y==must_not_move.y and pos.z==must_not_move.z then
			return
		end]]
	end
	local nodelist = {}
	for _, pos in ipairs(poslist) do
		local node = minetest.get_node(pos)
		local meta = minetest.get_meta(pos):to_table()
		nodelist[#(nodelist)+1] = {oldpos = pos, pos = vector.add(pos, vect), node = node, meta = meta}
	end
	local objects = {}
	for _, pos in ipairs(poslist) do
		for _,object in ipairs(minetest.get_objects_inside_radius(pos, 1)) do
			local entity = object:get_luaentity()
			if not entity or not mesecon.is_mvps_unmov(entity.name) then
				add_table(objects, object)
			end
		end
	end
	for _, obj in ipairs(objects) do
		obj:setpos(vector.add(obj:getpos(), vect))
	end
	for _,n in ipairs(nodelist) do
		local npos = n.pos
		minetest.set_node(npos, n.node)
		local meta = minetest.get_meta(npos)
		meta:from_table(n.meta)
		for __,pos in ipairs(poslist) do
			if npos.x == pos.x and npos.y == pos.y and npos.z == pos.z then
				table.remove(poslist, __)
				break
			end
		end
	end
	for __, pos in ipairs(poslist) do
		minetest.remove_node(pos)
	end
	for _, callback in ipairs(mesecon.on_mvps_move) do
		callback(nodelist)
	end
end

local function is_supported_node(name)
	return ((string.find(name, "tube") ~= nil) and (string.find(name, "pipeworks") ~= nil))
end


-- Frames
for xm=0,1 do
for xp=0,1 do
for ym=0,1 do
for yp=0,1 do
for zm=0,1 do
for zp=0,1 do

local a=8/16
local b=7/16
local nodeboxes= {
	{ -a, -a, -a, -b,  a, -b },
	{ -a, -a,  b, -b,  a,  a },
	{  b, -a,  b,  a,  a,  a },
	{  b, -a, -a,  a,  a, -b },

	{ -b,  b, -a,  b,  a, -b },
	{ -b, -a, -a,  b, -b, -b },
	
	{ -b,  b,  b,  b,  a,  a },
	{ -b, -a,  b,  b, -b,  a },

	{  b,  b, -b,  a,  a,  b },
	{  b, -a, -b,  a, -b,  b },

	{ -a,  b, -b, -b,  a,  b },
	{ -a, -a, -b, -b, -b,  b },
	}
	
	if yp==0 then
		table.insert(nodeboxes, {-b,b,-b, b,a,b})
	end
	if ym==0 then
		table.insert(nodeboxes, {-b,-a,-b, b,-b,b})
	end
	if xp==0 then
		table.insert(nodeboxes, {b,b,b,a,-b,-b})
	end
	if xm==0 then
		table.insert(nodeboxes, {-a,-b,-b,-b,b,b})
	end
	if zp==0 then
		table.insert(nodeboxes, {-b,-b,b, b,b,a})
	end
	if zm==0 then
		table.insert(nodeboxes, {-b,-b,-a, b,b,-b})
	end
	
	local nameext=tostring(xm)..tostring(xp)..tostring(ym)..tostring(yp)..tostring(zm)..tostring(zp)
	local groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2}
	if nameext~="111111" then groups.not_in_creative_inventory=1 end
	

	minetest.register_node("technic:frame_"..nameext,{
		description = S("Frame"),
		tiles = {"technic_frame.png"},
		groups=groups,
		drawtype = "nodebox",
		node_box = {
			type = "fixed",
		fixed=nodeboxes,
		},
		selection_box = {
			type="fixed",
			fixed={-0.5,-0.5,-0.5,0.5,0.5,0.5}
		},
		paramtype = "light",
		frame=1,
		drop="technic:frame_111111",
		sunlight_propagates = true,
		frame_connect_all=function(nodename)
			l2={}
			l1={{x=-1,y=0,z=0},{x=1,y=0,z=0},{x=0,y=-1,z=0},{x=0,y=1,z=0},{x=0,y=0,z=-1},{x=0,y=0,z=1}}
			for i,dir in ipairs(l1) do
				if string.sub(nodename,-7+i,-7+i)=="1" then
					l2[#(l2)+1]=dir
				end
			end
			return l2
		end,
		on_punch=function(pos,node,puncher)
			local ppos=puncher:getpos()
			local pvect=puncher:get_look_dir()
			local pface=get_face(pos,ppos,pvect)
			if pface==nil then return end
			local nodename=node.name
			local newstate=tostring(1-tonumber(string.sub(nodename,-7+pface,-7+pface)))
			if pface<=5 then
				nodename=string.sub(nodename,1,-7+pface-1)..newstate..string.sub(nodename,-7+pface+1)
			else
				nodename=string.sub(nodename,1,-2)..newstate
			end
			node.name=nodename
			minetest.set_node(pos,node)
		end,
		on_place = function(itemstack, placer, pointed_thing)
			local pos = pointed_thing.above
			if minetest.is_protected(pos, placer:get_player_name()) then
				minetest.log("action", placer:get_player_name()
					.. " tried to place " .. itemstack:get_name()
					.. " at protected position "
					.. minetest.pos_to_string(pos))
				minetest.record_protection_violation(pos, placer:get_player_name())
				return itemstack
			end
			if pos == nil then return end
			local node = minetest.get_node(pos)
			if node.name ~= "air" then
				if is_supported_node(node.name) then
					obj = minetest.add_entity(pos, "technic:frame_entity")
					obj:get_luaentity():set_node({name=itemstack:get_name()})
				end
			else
				minetest.set_node(pos, {name = itemstack:get_name()})
			end
			if not infinite_stacks then
				itemstack:take_item()
			end
			return itemstack
		end,
		on_rightclick = function(pos, node, placer, itemstack, pointed_thing)
			if is_supported_node(itemstack:get_name()) then
				if minetest.is_protected(pos, placer:get_player_name()) then
					minetest.log("action", placer:get_player_name()
						.. " tried to place " .. itemstack:get_name()
						.. " at protected position "
						.. minetest.pos_to_string(pos))
					minetest.record_protection_violation(pos, placer:get_player_name())
					return itemstack
				end
				
				minetest.set_node(pos, {name = itemstack:get_name()})
				
				local take_item = true
				local def = minetest.registered_items[itemstack:get_name()]
				-- Run callback
				if def.after_place_node then
					-- Copy place_to because callback can modify it
					local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
					if def.after_place_node(pos_copy, placer, itemstack) then
						take_item = false
					end
				end

				-- Run script hook
				local _, callback
				for _, callback in ipairs(minetest.registered_on_placenodes) do
					-- Copy pos and node because callback can modify them
					local pos_copy = {x=pos.x, y=pos.y, z=pos.z}
					local newnode_copy = {name=def.name, param1=0, param2=0}
					local oldnode_copy = {name="air", param1=0, param2=0}
					if callback(pos_copy, newnode_copy, placer, oldnode_copy, itemstack) then
						take_item = false
					end
				end

				if take_item then
					itemstack:take_item()
				end
				
				obj = minetest.add_entity(pos, "technic:frame_entity")
				obj:get_luaentity():set_node({name=node.name})
				
				return itemstack
			else
				--local pointed_thing = {type = "node", under = pos}
				if pointed_thing then
					minetest.item_place_node(itemstack, placer, pointed_thing)
				end
			end
		end,
	})

end
end
end
end
end
end

minetest.register_entity("technic:frame_entity", {
	initial_properties = {
		physical = true,
		collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
		visual = "wielditem",
		textures = {},
		visual_size = {x=0.667, y=0.667},
	},

	node = {},

	set_node = function(self, node)
		self.node = node
		local pos = self.object:getpos()
		pos = {x = math.floor(pos.x+0.5), y = math.floor(pos.y+0.5), z = math.floor(pos.z+0.5)}
		frames_pos[pos_to_string(pos)] = node.name
		local stack = ItemStack(node.name)
		local itemtable = stack:to_table()
		local itemname = nil
		if itemtable then
			itemname = stack:to_table().name
		end
		local item_texture = nil
		local item_type = ""
		if minetest.registered_items[itemname] then
			item_texture = minetest.registered_items[itemname].inventory_image
			item_type = minetest.registered_items[itemname].type
		end
		prop = {
			is_visible = true,
			textures = {node.name},
		}
		self.object:set_properties(prop)
	end,

	get_staticdata = function(self)
		return self.node.name
	end,

	on_activate = function(self, staticdata)
		self.object:set_armor_groups({immortal=1})
		self:set_node({name=staticdata})
	end,
	
	dig = function(self)
		minetest.handle_node_drops(self.object:getpos(), {ItemStack("technic:frame_111111")}, self.last_puncher)
		local pos = self.object:getpos()
		pos = {x = math.floor(pos.x+0.5), y = math.floor(pos.y+0.5), z = math.floor(pos.z+0.5)}
		frames_pos[pos_to_string(pos)] = nil
		self.object:remove()
	end,
	
	on_punch = function(self, puncher, time_from_last_punch, tool_capabilities, dir)
		local pos = self.object:getpos()
		if self.damage_object == nil then
			self.damage_object = minetest.add_entity(pos, "technic:damage_entity")
			self.damage_object:get_luaentity().remaining_time = 0.25
			self.damage_object:get_luaentity().frame_object = self
			self.damage_object:get_luaentity().texture_index = 0
			self.damage_object:get_luaentity().texture_change_time = 0.15
		else
			self.damage_object:get_luaentity().remaining_time = 0.25
		end
		self.last_puncher = puncher
		local ppos = puncher:getpos()
		local pvect = puncher:get_look_dir()
		local pface = get_face(pos,ppos,pvect)
		if pface == nil then return end
		local nodename = self.node.name
		local newstate = tostring(1-tonumber(string.sub(nodename, -7+pface, -7+pface)))
		if pface <= 5 then
			nodename = string.sub(nodename, 1, -7+pface-1)..newstate..string.sub(nodename, -7+pface+1)
		else
			nodename = string.sub(nodename, 1, -2)..newstate
		end
		self.node.name = nodename
		self:set_node(self.node)
	end,
	
	on_rightclick = function(self, clicker)
		local pos = self.object:getpos()
		local ppos = clicker:getpos()
		local pvect = clicker:get_look_dir()
		local pface = get_face(pos, ppos, pvect)
		if pface == nil then return end
		local pos_under = {x = math.floor(pos.x+0.5), y = math.floor(pos.y+0.5), z = math.floor(pos.z+0.5)}
		local pos_above = {x = pos_under.x, y = pos_under.y, z = pos_under.z}
		local index = ({"x", "y", "z"})[math.floor((pface+1)/2)]
		pos_above[index] = pos_above[index] + 2*((pface+1)%2) - 1
		local pointed_thing = {type = "node", under = pos_under, above = pos_above}
		local itemstack = clicker:get_wielded_item()
		local itemdef = minetest.registered_items[itemstack:get_name()]
		if itemdef ~= nil then
			itemdef.on_place(itemstack, clicker, pointed_thing)
		end
	end,
})

local crack = "crack_anylength.png^[verticalframe:5:0"
minetest.register_entity("technic:damage_entity", {
	initial_properties = {
		visual = "cube",
		visual_size = {x=1.01, y=1.01},
		textures = {crack, crack, crack, crack, crack, crack},
		collisionbox = {0, 0, 0, 0, 0, 0},
		physical = false,
	},
	on_step = function(self, dtime)
		if self.remaining_time == nil then
			self.object:remove()
			self.frame_object.damage_object = nil
		end
		self.remaining_time = self.remaining_time - dtime
		if self.remaining_time < 0 then
			self.object:remove()
			self.frame_object.damage_object = nil
		end
		self.texture_change_time = self.texture_change_time - dtime
		if self.texture_change_time < 0 then
			self.texture_change_time = self.texture_change_time + 0.15
			self.texture_index = self.texture_index + 1
			if self.texture_index == 5 then
				self.object:remove()
				self.frame_object.damage_object = nil
				self.frame_object:dig()
			end
			local ct = "crack_anylength.png^[verticalframe:5:"..self.texture_index
			self.object:set_properties({textures = {ct, ct, ct, ct, ct, ct}})
		end
	end,
})

mesecon.register_mvps_unmov("technic:frame_entity")
mesecon.register_mvps_unmov("technic:damage_entity")
mesecon.register_on_mvps_move(function(moved_nodes)
	local to_move = {}
	for _, n in ipairs(moved_nodes) do
		if frames_pos[pos_to_string(n.oldpos)] ~= nil then
			to_move[#to_move+1] = {pos = n.pos, oldpos = n.oldpos, name = frames_pos[pos_to_string(n.oldpos)]}
			frames_pos[pos_to_string(n.oldpos)] = nil
		end
	end
	if #to_move > 0 then
		for _, t in ipairs(to_move) do
			frames_pos[pos_to_string(t.pos)] = t.name
			local objects = minetest.get_objects_inside_radius(t.oldpos, 0.1)
			for _, obj in ipairs(objects) do
				local entity = obj:get_luaentity()
				if entity and (entity.name == "technic:frame_entity" or entity.name == "technic:damage_entity") then
					obj:setpos(t.pos)
				end
			end
		end
	end
end)

minetest.register_on_dignode(function(pos, node)
	if frames_pos[pos_to_string(pos)] ~= nil then
		minetest.set_node(pos, {name = frames_pos[pos_to_string(pos)]})
		frames_pos[pos_to_string(pos)] = nil
		local objects = minetest.get_objects_inside_radius(pos, 0.1)
		for _, obj in ipairs(objects) do
			local entity = obj:get_luaentity()
			if entity and (entity.name == "technic:frame_entity" or entity.name == "technic:damage_entity") then
				obj:remove()
			end
		end
	end
end)

-- Frame motor
local function connected(pos,c,adj)
	for _,vect in ipairs(adj) do
		local pos1=vector.add(pos,vect)
		local nodename=minetest.get_node(pos1).name
		if frames_pos[pos_to_string(pos1)] then
			nodename = frames_pos[pos_to_string(pos1)]
		end
		if not(pos_in_list(c,pos1)) and nodename~="air" and
		(minetest.registered_nodes[nodename].frames_can_connect==nil or
		minetest.registered_nodes[nodename].frames_can_connect(pos1,vect)) then
			c[#(c)+1]=pos1
			if minetest.registered_nodes[nodename].frame==1 then
				local adj=minetest.registered_nodes[nodename].frame_connect_all(nodename)
				connected(pos1,c,adj)
			end
		end
	end
end

local function get_connected_nodes(pos)
	c={pos}
	local nodename=minetest.get_node(pos).name
	if frames_pos[pos_to_string(pos)] then
		nodename = frames_pos[pos_to_string(pos)]
	end
	connected(pos,c,minetest.registered_nodes[nodename].frame_connect_all(nodename))
	return c
end

local function frame_motor_on(pos, node)
	local dirs = {{x=0,y=1,z=0},{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=1,y=0,z=0},{x=-1,y=0,z=0},{x=0,y=-1,z=0}}
	local nnodepos = vector.add(pos, dirs[math.floor(node.param2/4)+1])
	local dir = minetest.facedir_to_dir(node.param2)
	local nnode=minetest.get_node(nnodepos)
	if frames_pos[pos_to_string(nnodepos)] then
		nnode.name = frames_pos[pos_to_string(nnodepos)]
	end
	local meta = minetest.get_meta(pos)
	if meta:get_int("last_moved") == minetest.get_gametime() then
		return
	end
	local owner = meta:get_string("owner")
	if minetest.registered_nodes[nnode.name].frame==1 then
		local connected_nodes=get_connected_nodes(nnodepos)
		move_nodes_vect(connected_nodes,dir,pos,owner)
	end
	minetest.get_meta(vector.add(pos, dir)):set_int("last_moved", minetest.get_gametime())
end

minetest.register_node("technic:frame_motor",{
	description = S("Frame Motor"),
	tiles = {"pipeworks_filter_top.png^[transformR90", "technic_lv_cable.png", "technic_lv_cable.png",
		"technic_lv_cable.png", "technic_lv_cable.png", "technic_lv_cable.png"},
	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2,mesecon=2},
	paramtype2 = "facedir",
	mesecons={effector={action_on=frame_motor_on}},
	after_place_node = function(pos, placer, itemstack)
		local meta = minetest.get_meta(pos)
		meta:set_string("owner", placer:get_player_name())
	end,
	frames_can_connect=function(pos,dir)
		local node = minetest.get_node(pos)
		local dir2 = ({{x=0,y=1,z=0},{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=1,y=0,z=0},{x=-1,y=0,z=0},{x=0,y=-1,z=0}})[math.floor(node.param2/4)+1]
		return dir2.x~=-dir.x or dir2.y~=-dir.y or dir2.z~=-dir.z
	end
})



-- Templates
local function template_connected(pos,c,connectors)
	for _,vect in ipairs({{x=0,y=1,z=0},{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=1,y=0,z=0},{x=-1,y=0,z=0},{x=0,y=-1,z=0}}) do
		local pos1=vector.add(pos,vect)
		local nodename=minetest.get_node(pos1).name
		if not(pos_in_list(c,pos1)) and (nodename=="technic:template" or nodename == "technic:template_connector")then
			local meta = minetest.get_meta(pos1)
			if meta:get_string("connected") == "" then
				c[#(c)+1]=pos1
				template_connected(pos1,c,connectors)
				if nodename == "technic:template_connector" then
					connectors[#connectors+1] = pos1
				end
			end
		end
	end
end

local function get_templates(pos)
	local c = {pos}
	local connectors
	if minetest.get_node(pos).name == "technic:template_connector" then
		connectors = {pos}
	else
		connectors = {}
	end
	template_connected(pos,c,connectors)
	return c, connectors
end

local function swap_template(pos, new)
	local meta = minetest.get_meta(pos)
	local saved_node = meta:get_string("saved_node")
	meta:set_string("saved_node", "")
	technic.swap_node(pos, new)
	local meta = minetest.get_meta(pos)
	meta:set_string("saved_node", saved_node)
end

local function save_node(pos)
	local node = minetest.get_node(pos)
	if node.name == "air" then
		minetest.set_node(pos, {name="technic:template"})
		return
	end
	if node.name == "technic:template" then
		swap_template(pos, "technic:template_connector")
		local meta = minetest.get_meta(pos)
		meta:set_string("connected", "")
		return
	end
	local meta = minetest.get_meta(pos)
	local meta0 = meta:to_table()
	for _, list in pairs(meta0.inventory) do
		for key, stack in pairs(list) do
			list[key] = stack:to_string()
		end
	end
	node.meta = meta0
	minetest.set_node(pos, {name="technic:template"})
	return node
end

local function restore_node(pos, node)
	minetest.set_node(pos, node)
	local meta = minetest.get_meta(pos)
	for _, list in pairs(node.meta.inventory) do
		for key, stack in pairs(list) do
			list[key] = ItemStack(stack)
		end
	end
	meta:from_table(node.meta)
end

local function expand_template(pos)
	local meta = minetest.get_meta(pos)
	local c = meta:get_string("connected")
	if c == "" then return end
	c = minetest.deserialize(c)
	for _, vect in ipairs(c) do
		local pos1 = vector.add(pos, vect)
		local saved_node = save_node(pos1)
		local meta1 = minetest.get_meta(pos1)
		if saved_node ~= nil then
			meta1:set_string("saved_node", minetest.serialize(saved_node))
		else
			--meta1:set_string("saved_node", "")
		end
	end
end

local function compress_templates(pos)
	local templates, connectors = get_templates(pos)
	if #connectors == 0 then
		connectors = {pos}
	end
	for _, cn in ipairs(connectors) do
		local meta = minetest.get_meta(cn)
		local c = {}
		for _,p in ipairs(templates) do
			local np = vector.subtract(p, cn)
			if not pos_in_list(c,np) then
				c[#c+1] = np
			end
		end
		local cc = {}
		for _,p in ipairs(connectors) do
			local np = vector.subtract(p, cn)
			if (np.x ~= 0 or np.y ~= 0 or np.z ~= 0) then
				cc[pos_to_string(np)] = true
			end
		end
		swap_template(cn, "technic:template")
		meta:set_string("connected", minetest.serialize(c))
		meta:set_string("connectors_connected", minetest.serialize(cc))
	end
	
	for _,p in ipairs(templates) do
		if not pos_in_list(connectors, p) then
			minetest.set_node(p, {name = "air"})
		end
	end
end

local function template_drops(pos, node, oldmeta, digger)
	local c = oldmeta.fields.connected
	local cc = oldmeta.fields.connectors_connected
	local drops
	if c == "" or c == nil then
		drops = {"technic:template 1"}
	else
		if cc == "" or cc == nil then
			drops = {"technic:template 1"}
		else
			local dcc = minetest.deserialize(cc)
			if not table_empty(dcc) then
				drops = {}
				for sp, _ in pairs(dcc) do
					local ssp = pos_from_string(sp)
					local p = vector.add(ssp, pos)
					local meta = minetest.get_meta(p)
					local d = minetest.deserialize(meta:get_string("connectors_connected"))
					if d ~= nil then
						d[pos_to_string({x=-ssp.x, y=-ssp.y, z=-ssp.z})] = nil
						meta:set_string("connectors_connected", minetest.serialize(d))
					end
				end
			else
				local stack_max = 99
				local num = #(minetest.deserialize(c))
				drops = {}
				while num > stack_max do
					drops[#drops+1] = "technic:template "..stack_max
					num = num - stack_max
				end
				drops[#drops+1] = "technic:template "..num
			end
		end
	end
	minetest.handle_node_drops(pos, drops, digger)
end

local function template_on_destruct(pos, node)
	local meta = minetest.get_meta(pos)
	local saved_node = meta:get_string("saved_node")
	if saved_node ~= "" then
		local nnode = minetest.deserialize(saved_node)
		minetest.after(0, restore_node, pos, nnode)
	end
end

minetest.register_node("technic:template",{
	description = S("Template"),
	tiles = {"technic_mv_cable.png"},
	drop = "",
	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2},
	on_destruct = template_on_destruct,
	after_dig_node = template_drops,
	on_punch = function(pos,node,puncher)
		swap_template(pos, "technic:template_disabled")
	end
})

minetest.register_node("technic:template_disabled",{
	description = S("Template"),
	tiles = {"technic_hv_cable.png"},
	drop = "",
	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2,not_in_creative_inventory=1},
	on_destruct = template_on_destruct,
	after_dig_node = template_drops,
	on_punch = function(pos,node,puncher)
	local meta = minetest.get_meta(pos)
		swap_template(pos, "technic:template_connector")
	end
})

minetest.register_node("technic:template_connector",{
	description = S("Template"),
	tiles = {"technic_lv_cable.png"},
	drop = "",
	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2,not_in_creative_inventory=1},
	on_destruct = template_on_destruct,
	after_dig_node = template_drops,
	on_punch = function(pos,node,puncher)
		swap_template(pos, "technic:template")
	end
})

minetest.register_craftitem("technic:template_replacer",{
	description = S("Template (replacing)"),
	inventory_image = "technic_template_replacer.png",
	on_place = function(itemstack, placer, pointed_thing)
		local p = pointed_thing.under
		if minetest.is_protected and minetest.is_protected(p, placer:get_player_name()) then
			return nil
		end
		local node = minetest.get_node(p)
		if node.name == "technic:template" then return end
		local saved_node = save_node(p)
		itemstack:take_item()
		if saved_node ~= nil then
			local meta = minetest.get_meta(p)
			meta:set_string("saved_node", minetest.serialize(saved_node))
		end
		return itemstack
	end
})

minetest.register_tool("technic:template_tool",{
	description = S("Template Tool"),
	inventory_image = "technic_template_tool.png",
	on_use = function(itemstack, puncher, pointed_thing)
		local pos = pointed_thing.under
		if pos == nil or (minetest.is_protected and minetest.is_protected(pos, puncher:get_player_name())) then
			return nil
		end
		local node = minetest.get_node(pos)
		if node.name ~= "technic:template" and node.name ~= "technic:template_connector" then return end
		local meta = minetest.get_meta(pos)
		local c2 = meta:get_string("connected")
		if c2 ~= "" then
			expand_template(pos)
		else
			compress_templates(pos)
		end
		
	end
})



-- Template motor
local function get_template_nodes(pos)
	local meta = minetest.get_meta(pos)
	local connected = meta:get_string("connected")
	if connected == "" then return {} end
	local adj = minetest.deserialize(connected)
	local c = {}
	for _,vect in ipairs(adj) do
		local pos1=vector.add(pos,vect)
		local nodename=minetest.get_node(pos1).name
		if not(pos_in_list(c,pos1)) and nodename~="air" then
			c[#(c)+1]=pos1
		end
	end
	return c
end

local function template_motor_on(pos, node)
	local dirs = {{x=0,y=1,z=0},{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=1,y=0,z=0},{x=-1,y=0,z=0},{x=0,y=-1,z=0}}
	local nnodepos = vector.add(pos, dirs[math.floor(node.param2/4)+1])
	local dir = minetest.facedir_to_dir(node.param2)
	local nnode=minetest.get_node(nnodepos)
	local meta = minetest.get_meta(pos)
	if meta:get_int("last_moved") == minetest.get_gametime() then
		return
	end
	local owner = meta:get_string("owner")
	if nnode.name == "technic:template" then
		local connected_nodes=get_template_nodes(nnodepos)
		move_nodes_vect(connected_nodes,dir,pos,owner)
	end
	minetest.get_meta(vector.add(pos, dir)):set_int("last_moved", minetest.get_gametime())
end

minetest.register_node("technic:template_motor",{
	description = S("Template Motor"),
	tiles = {"pipeworks_filter_top.png^[transformR90", "technic_lv_cable.png", "technic_lv_cable.png",
		"technic_lv_cable.png", "technic_lv_cable.png", "technic_lv_cable.png"},
	groups = {snappy=2,choppy=2,oddly_breakable_by_hand=2,mesecon=2},
	paramtype2 = "facedir",
	mesecons={effector={action_on=template_motor_on}},
	after_place_node = function(pos, placer, itemstack)
		local meta = minetest.get_meta(pos)
		meta:set_string("owner", placer:get_player_name())
	end,
})

-- Crafts
minetest.register_craft({
	output = 'technic:frame_111111',
	recipe = {
		{'',			'default:stick',	''},
		{'default:stick',	'technic:brass_ingot',	'default:stick'},
		{'',			'default:stick',	''},
	}
})

minetest.register_craft({
	output = 'technic:frame_motor',
	recipe = {
		{'',					'technic:frame_111111',	''},
		{'group:mesecon_conductor_craftable',	'technic:motor',	'group:mesecon_conductor_craftable'},
		{'',					'technic:frame_111111',	''},
	}
})

minetest.register_craft({
	output = 'technic:template 10',
	recipe = {
		{'',			'technic:brass_ingot',	''},
		{'technic:brass_ingot',	'default:mese_crystal',	'technic:brass_ingot'},
		{'',			'technic:brass_ingot',	''},
	}
})

minetest.register_craft({
	output = 'technic:template_replacer',
	recipe = {{'technic:template'}}
})

minetest.register_craft({
	output = 'technic:template',
	recipe = {{'technic:template_replacer'}}
})

minetest.register_craft({
	output = 'technic:template_motor',
	recipe = {
		{'',					'technic:template',	''},
		{'group:mesecon_conductor_craftable',	'technic:motor',	'group:mesecon_conductor_craftable'},
		{'',					'technic:template',	''},
	}
})

minetest.register_craft({
	output = 'technic:template_tool',
	recipe = {
		{'',				'technic:template',	''},
		{'default:mese_crystal',	'default:stick',	'default:mese_crystal'},
		{'',				'default:stick',	''},
	}
})