From da95be53ec5703e808233d7b45fc42fb500863dd Mon Sep 17 00:00:00 2001
From: coil <51716565+coil0@users.noreply.github.com>
Date: Mon, 30 Dec 2019 21:02:01 +0100
Subject: [PATCH] Fix radiation protection when armor group is not set (#509)

---
 technic/machines/switching_station.lua |  386 +++++++++++++++++++++++++++++++++++++++++-------------
 1 files changed, 292 insertions(+), 94 deletions(-)

diff --git a/technic/machines/switching_station.lua b/technic/machines/switching_station.lua
index a6c0c99..7f3a0b9 100644
--- a/technic/machines/switching_station.lua
+++ b/technic/machines/switching_station.lua
@@ -1,113 +1,147 @@
--- SWITCHING STATION
--- The switching station is the center of all power distribution on an electric network.
--- The station will collect all produced power from producers (PR) and batteries (BA)
--- and distribute it to receivers (RE) and depleted batteries (BA).
---
--- It works like this:
---  All PR,BA,RE nodes are indexed and tagged with the switching station.
--- The tagging is to allow more stations to be built without allowing a cheat
--- with duplicating power.
---  All the RE nodes are queried for their current EU demand. Those which are off
--- would require no or a small standby EU demand, while those which are on would
--- require more.
--- If the total demand is less than the available power they are all updated with the
--- demand number.
--- If any surplus exists from the PR nodes the batteries will be charged evenly with this.
--- If the total demand requires draw on the batteries they will be discharged evenly.
---
--- If the total demand is more than the available power all RE nodes will be shut down.
--- We have a brown-out situation.
---
--- Hence all the power distribution logic resides in this single node.
---
---  Nodes connected to the network will have one or more of these parameters as meta data:
---   <LV|MV|HV>_EU_supply : Exists for PR and BA node types. This is the EU value supplied by the node. Output
---   <LV|MV|HV>_EU_demand : Exists for RE and BA node types. This is the EU value the node requires to run. Output
---   <LV|MV|HV>_EU_input  : Exists for RE and BA node types. This is the actual EU value the network can give the node. Input
---
---  The reason the LV|MV|HV type is prepended toe meta data is because some machine could require several supplies to work.
---  This way the supplies are separated per network.
+-- See also technic/doc/api.md
 
 technic.networks = {}
+technic.cables = {}
+technic.redundant_warn = {}
+
+local mesecons_path = minetest.get_modpath("mesecons")
+local digilines_path = minetest.get_modpath("digilines")
 
 local S = technic.getter
+
+local cable_entry = "^technic_cable_connection_overlay.png"
 
 minetest.register_craft({
 	output = "technic:switching_station",
 	recipe = {
-		{"technic:cast_iron_ingot", "technic:lv_transformer", "technic:cast_iron_ingot"},
-		{"default:copper_ingot",    "technic:lv_cable0",      "default:copper_ingot"},
-		{"technic:cast_iron_ingot", "technic:lv_cable0",      "technic:cast_iron_ingot"}
+		{"",                     "technic:lv_transformer", ""},
+		{"default:copper_ingot", "technic:machine_casing", "default:copper_ingot"},
+		{"technic:lv_cable",     "technic:lv_cable",       "technic:lv_cable"}
 	}
 })
 
+local mesecon_def
+if mesecons_path then
+	mesecon_def = {effector = {
+		rules = mesecon.rules.default,
+	}}
+end
+
 minetest.register_node("technic:switching_station",{
 	description = S("Switching Station"),
-	tiles  = {"technic_water_mill_top_active.png", "technic_water_mill_top_active.png",
-                  "technic_water_mill_top_active.png", "technic_water_mill_top_active.png",
-	          "technic_water_mill_top_active.png", "technic_water_mill_top_active.png"},
-	groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2},
+	tiles  = {
+		"technic_water_mill_top_active.png",
+		"technic_water_mill_top_active.png"..cable_entry,
+		"technic_water_mill_top_active.png",
+		"technic_water_mill_top_active.png",
+		"technic_water_mill_top_active.png",
+		"technic_water_mill_top_active.png"},
+	groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2, technic_all_tiers=1},
+	connect_sides = {"bottom"},
 	sounds = default.node_sound_wood_defaults(),
-	drawtype = "nodebox",
-	paramtype = "light",
-	node_box = {
-		type = "fixed",
-		fixed = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
-	},
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)
 		meta:set_string("infotext", S("Switching Station"))
+		meta:set_string("active", 1)
+		meta:set_string("channel", "switching_station"..minetest.pos_to_string(pos))
+		meta:set_string("formspec", "field[channel;Channel;${channel}]")
+		local poshash = minetest.hash_node_position(pos)
+		technic.redundant_warn.poshash = nil
 	end,
+	after_dig_node = function(pos)
+		minetest.forceload_free_block(pos)
+		pos.y = pos.y - 1
+		minetest.forceload_free_block(pos)
+		local poshash = minetest.hash_node_position(pos)
+		technic.redundant_warn.poshash = nil
+	end,
+	on_receive_fields = function(pos, formname, fields, sender)
+		if not fields.channel then
+			return
+		end
+		local plname = sender:get_player_name()
+		if minetest.is_protected(pos, plname) then
+			minetest.record_protection_violation(pos, plname)
+			return
+		end
+		local meta = minetest.get_meta(pos)
+		meta:set_string("channel", fields.channel)
+	end,
+	mesecons = mesecon_def,
+	digiline = {
+		receptor = {action = function() end},
+		effector = {
+			action = function(pos, node, channel, msg)
+				if msg ~= "GET" and msg ~= "get" then
+					return
+				end
+				local meta = minetest.get_meta(pos)
+				if channel ~= meta:get_string("channel") then
+					return
+				end
+				digilines.receptor_send(pos, digilines.rules.default, channel, {
+					supply = meta:get_int("supply"),
+					demand = meta:get_int("demand")
+				})
+			end
+		},
+	},
 })
-
---------------------------------------------------
--- Functions to help the machines on the electrical network
---------------------------------------------------
--- This one provides a timeout for a node in case it was disconnected from the network
--- A node must be touched by the station continuously in order to function
-function technic.switching_station_timeout_count(pos, tier)
-	local meta = minetest.get_meta(pos)
-	local timeout = meta:get_int(tier.."_EU_timeout")
-	if timeout == 0 then
-		meta:set_int(tier.."_EU_input", 0)
-	else
-		meta:set_int(tier.."_EU_timeout", timeout - 1)
-	end
-end
 
 --------------------------------------------------
 -- Functions to traverse the electrical network
 --------------------------------------------------
+local function flatten(map)
+	local list = {}
+	for key, value in pairs(map) do
+		list[#list + 1] = value
+	end
+	return list
+end
 
 -- Add a wire node to the LV/MV/HV network
-local add_new_cable_node = function(nodes, pos)
-	-- Ignore if the node has already been added
-	for i = 1, #nodes do
-		if pos.x == nodes[i].x and
-		   pos.y == nodes[i].y and
-		   pos.z == nodes[i].z then
-			return false
-		end
+local function add_network_node(nodes, pos, network_id)
+	local node_id = minetest.hash_node_position(pos)
+	technic.cables[node_id] = network_id
+	if nodes[node_id] then
+		return false
 	end
-	table.insert(nodes, {x=pos.x, y=pos.y, z=pos.z, visited=1})
+	nodes[node_id] = pos
 	return true
 end
 
+local function add_cable_node(nodes, pos, network_id, queue)
+	if add_network_node(nodes, pos, network_id) then
+		queue[#queue + 1] = pos
+	end
+end
+
 -- Generic function to add found connected nodes to the right classification array
-local check_node_subp = function(PR_nodes, RE_nodes, BA_nodes, all_nodes, pos, machines, tier)
-	local meta = minetest.get_meta(pos)
+local check_node_subp = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, pos, machines, tier, sw_pos, from_below, network_id, queue)
+	technic.get_or_load_node(pos)
 	local name = minetest.get_node(pos).name
 
 	if technic.is_tier_cable(name, tier) then
-		add_new_cable_node(all_nodes, pos)
+		add_cable_node(all_nodes, pos,network_id, queue)
 	elseif machines[name] then
 		--dprint(name.." is a "..machines[name])
+		local meta = minetest.get_meta(pos)
+		meta:set_string(tier.."_network",minetest.pos_to_string(sw_pos))
 		if     machines[name] == technic.producer then
-			add_new_cable_node(PR_nodes, pos)
+			add_network_node(PR_nodes, pos, network_id)
 		elseif machines[name] == technic.receiver then
-			add_new_cable_node(RE_nodes, pos)
+			add_network_node(RE_nodes, pos, network_id)
+		elseif machines[name] == technic.producer_receiver then
+			add_network_node(PR_nodes, pos, network_id)
+			add_network_node(RE_nodes, pos, network_id)
+		elseif machines[name] == "SPECIAL" and
+				(pos.x ~= sw_pos.x or pos.y ~= sw_pos.y or pos.z ~= sw_pos.z) and
+				from_below then
+			-- Another switching station -> disable it
+			add_network_node(SP_nodes, pos, network_id)
+			meta:set_int("active", 0)
 		elseif machines[name] == technic.battery then
-			add_new_cable_node(BA_nodes, pos)
+			add_network_node(BA_nodes, pos, network_id)
 		end
 
 		meta:set_int(tier.."_EU_timeout", 2) -- Touch node
@@ -115,8 +149,7 @@
 end
 
 -- Traverse a network given a list of machines and a cable type name
-local traverse_network = function(PR_nodes, RE_nodes, BA_nodes, all_nodes, i, machines, tier)
-	local pos = all_nodes[i]
+local traverse_network = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, pos, machines, tier, sw_pos, network_id, queue)
 	local positions = {
 		{x=pos.x+1, y=pos.y,   z=pos.z},
 		{x=pos.x-1, y=pos.y,   z=pos.z},
@@ -124,9 +157,8 @@
 		{x=pos.x,   y=pos.y-1, z=pos.z},
 		{x=pos.x,   y=pos.y,   z=pos.z+1},
 		{x=pos.x,   y=pos.y,   z=pos.z-1}}
-	--print("ON")
 	for i, cur_pos in pairs(positions) do
-		check_node_subp(PR_nodes, RE_nodes, BA_nodes, all_nodes, cur_pos, machines, tier)
+		check_node_subp(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, cur_pos, machines, tier, sw_pos, i == 3, network_id, queue)
 	end
 end
 
@@ -137,36 +169,85 @@
 	end
 end
 
-local get_network = function(pos1, tier)
-	local cached = technic.networks[minetest.hash_node_position(pos1)]
+local get_network = function(sw_pos, pos1, tier)
+	local network_id = minetest.hash_node_position(pos1)
+	local cached = technic.networks[network_id]
 	if cached and cached.tier == tier then
 		touch_nodes(cached.PR_nodes, tier)
 		touch_nodes(cached.BA_nodes, tier)
 		touch_nodes(cached.RE_nodes, tier)
+		for _, pos in ipairs(cached.SP_nodes) do
+			local meta = minetest.get_meta(pos)
+			meta:set_int("active", 0)
+			meta:set_string("active_pos", minetest.serialize(sw_pos))
+		end
 		return cached.PR_nodes, cached.BA_nodes, cached.RE_nodes
 	end
-	local i = 1
 	local PR_nodes = {}
 	local BA_nodes = {}
 	local RE_nodes = {}
-	local all_nodes = {pos1}
-	repeat
-		traverse_network(PR_nodes, RE_nodes, BA_nodes, all_nodes,
-				i, technic.machines[tier], tier)
-		i = i + 1
-	until all_nodes[i] == nil
-	technic.networks[minetest.hash_node_position(pos1)] = {tier = tier, PR_nodes = PR_nodes, RE_nodes = RE_nodes, BA_nodes = BA_nodes}
+	local SP_nodes = {}
+	local all_nodes = {}
+	local queue = {}
+	add_cable_node(all_nodes, pos1, network_id, queue)
+	while next(queue) do
+		local to_visit = {}
+		for _, pos in ipairs(queue) do
+			traverse_network(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes,
+					pos, technic.machines[tier], tier, sw_pos, network_id, to_visit)
+		end
+		queue = to_visit
+	end
+	PR_nodes = flatten(PR_nodes)
+	BA_nodes = flatten(BA_nodes)
+	RE_nodes = flatten(RE_nodes)
+	SP_nodes = flatten(SP_nodes)
+	all_nodes = flatten(all_nodes)
+	technic.networks[network_id] = {tier = tier, all_nodes = all_nodes, SP_nodes = SP_nodes,
+			PR_nodes = PR_nodes, RE_nodes = RE_nodes, BA_nodes = BA_nodes}
 	return PR_nodes, BA_nodes, RE_nodes
 end
 
 -----------------------------------------------
 -- The action code for the switching station --
 -----------------------------------------------
+
+technic.powerctrl_state = true
+
+minetest.register_chatcommand("powerctrl", {
+	params = "state",
+	description = "Enables or disables technic's switching station ABM",
+	privs = { basic_privs = true },
+	func = function(name, state)
+		if state == "on" then
+			technic.powerctrl_state = true
+		else
+			technic.powerctrl_state = false
+		end
+	end
+})
+
+-- Run all the nodes
+local function run_nodes(list, run_stage)
+	for _, pos in ipairs(list) do
+		technic.get_or_load_node(pos)
+		local node = minetest.get_node_or_nil(pos)
+		if node and node.name then
+			local nodedef = minetest.registered_nodes[node.name]
+			if nodedef and nodedef.technic_run then
+				nodedef.technic_run(pos, node, run_stage)
+			end
+		end
+	end
+end
+
 minetest.register_abm({
 	nodenames = {"technic:switching_station"},
+	label = "Switching Station", -- allows the mtt profiler to profile this abm individually
 	interval   = 1,
 	chance     = 1,
 	action = function(pos, node, active_object_count, active_object_count_wider)
+		if not technic.powerctrl_state then return end
 		local meta             = minetest.get_meta(pos)
 		local meta1            = nil
 		local pos1             = {}
@@ -184,24 +265,68 @@
 		-- Which kind of network are we on:
 		pos1 = {x=pos.x, y=pos.y-1, z=pos.z}
 
+		--Disable if necessary
+		if meta:get_int("active") ~= 1 then
+			minetest.forceload_free_block(pos)
+			minetest.forceload_free_block(pos1)
+			meta:set_string("infotext",S("%s Already Present"):format(machine_name))
+
+			local poshash = minetest.hash_node_position(pos)
+
+			if not technic.redundant_warn[poshash] then
+				technic.redundant_warn[poshash] = true
+				print("[TECHNIC] Warning: redundant switching station found near "..minetest.pos_to_string(pos))
+			end
+			return
+		end
+
 		local name = minetest.get_node(pos1).name
 		local tier = technic.get_cable_tier(name)
 		if tier then
-			PR_nodes, BA_nodes, RE_nodes = get_network(pos1, tier)
+			-- Forceload switching station
+			minetest.forceload_block(pos)
+			minetest.forceload_block(pos1)
+			PR_nodes, BA_nodes, RE_nodes = get_network(pos, pos1, tier)
 		else
 			--dprint("Not connected to a network")
 			meta:set_string("infotext", S("%s Has No Network"):format(machine_name))
+			minetest.forceload_free_block(pos)
+			minetest.forceload_free_block(pos1)
 			return
 		end
-		--dprint("nodes="..table.getn(all_nodes)
-		--		.." PR="..table.getn(PR_nodes)
-		--		.." BA="..table.getn(BA_nodes)
-		--		.." RE="..table.getn(RE_nodes))
+
+		run_nodes(PR_nodes, technic.producer)
+		run_nodes(RE_nodes, technic.receiver)
+		run_nodes(BA_nodes, technic.battery)
 
 		-- Strings for the meta data
 		local eu_demand_str    = tier.."_EU_demand"
 		local eu_input_str     = tier.."_EU_input"
 		local eu_supply_str    = tier.."_EU_supply"
+
+		-- Distribute charge equally across multiple batteries.
+		local charge_total = 0
+		local battery_count = 0
+
+		for n, pos1 in pairs(BA_nodes) do
+			meta1 = minetest.get_meta(pos1)
+			local charge = meta1:get_int("internal_EU_charge")
+
+			if (meta1:get_int(eu_demand_str) ~= 0) then
+				charge_total = charge_total + charge
+				battery_count = battery_count + 1
+			end
+		end
+
+		local charge_distributed = math.floor(charge_total / battery_count)
+
+		for n, pos1 in pairs(BA_nodes) do
+			meta1 = minetest.get_meta(pos1)
+
+			if (meta1:get_int(eu_demand_str) ~= 0) then
+				meta1:set_int("internal_EU_charge", charge_distributed)
+			end
+		end
 
 		-- Get all the power from the PR nodes
 		local PR_eu_supply = 0 -- Total power
@@ -235,9 +360,26 @@
 		end
 		--dprint("Total BA demand:"..BA_eu_demand)
 
-		meta:set_string("infotext",
-				S("%s. Supply: %d Demand: %d"):format(
-				machine_name, PR_eu_supply, RE_eu_demand))
+		meta:set_string("infotext", S("@1. Supply: @2 Demand: @3",
+				machine_name, technic.EU_string(PR_eu_supply),
+				technic.EU_string(RE_eu_demand)))
+
+		-- If mesecon signal and power supply or demand changed then
+		-- send them via digilines.
+		if mesecons_path and digilines_path and mesecon.is_powered(pos) then
+			if PR_eu_supply ~= meta:get_int("supply") or
+					RE_eu_demand ~= meta:get_int("demand") then
+				local channel = meta:get_string("channel")
+				digilines.receptor_send(pos, digilines.rules.default, channel, {
+					supply = PR_eu_supply,
+					demand = RE_eu_demand
+				})
+			end
+		end
+
+		-- Data that will be used by the power monitor
+		meta:set_int("supply",PR_eu_supply)
+		meta:set_int("demand",RE_eu_demand)
 
 		-- If the PR supply is enough for the RE demand supply them all
 		if PR_eu_supply >= RE_eu_demand then
@@ -300,6 +442,62 @@
 			meta1 = minetest.get_meta(pos1)
 			meta1:set_int(eu_input_str, 0)
 		end
+
+	end,
+})
+
+-- Timeout ABM
+-- Timeout for a node in case it was disconnected from the network
+-- A node must be touched by the station continuously in order to function
+local function switching_station_timeout_count(pos, tier)
+	local meta = minetest.get_meta(pos)
+	local timeout = meta:get_int(tier.."_EU_timeout")
+	if timeout <= 0 then
+		meta:set_int(tier.."_EU_input", 0) -- Not needed anymore <-- actually, it is for supply converter
+		return true
+	else
+		meta:set_int(tier.."_EU_timeout", timeout - 1)
+		return false
+	end
+end
+minetest.register_abm({
+	label = "Machines: timeout check",
+	nodenames = {"group:technic_machine"},
+	interval   = 1,
+	chance     = 1,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		for tier, machines in pairs(technic.machines) do
+			if machines[node.name] and switching_station_timeout_count(pos, tier) then
+				local nodedef = minetest.registered_nodes[node.name]
+				if nodedef and nodedef.technic_disabled_machine_name then
+					node.name = nodedef.technic_disabled_machine_name
+					minetest.swap_node(pos, node)
+				elseif nodedef and nodedef.technic_on_disable then
+					nodedef.technic_on_disable(pos, node)
+				end
+				if nodedef then
+					local meta = minetest.get_meta(pos)
+					meta:set_string("infotext", S("%s Has No Network"):format(nodedef.description))
+				end
+			end
+		end
+	end,
+})
+
+--Re-enable disabled switching station if necessary, similar to the timeout above
+minetest.register_abm({
+	label = "Machines: re-enable check",
+	nodenames = {"technic:switching_station"},
+	interval   = 1,
+	chance     = 1,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		local pos1 = {x=pos.x,y=pos.y-1,z=pos.z}
+		local tier = technic.get_cable_tier(minetest.get_node(pos1).name)
+		if not tier then return end
+		if switching_station_timeout_count(pos, tier) then
+			local meta = minetest.get_meta(pos)
+			meta:set_int("active",1)
+		end
 	end,
 })
 

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