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generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 22:30:04 +0000
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--atc.lua
--registers and controls the ATC system

local atc={}
-- ATC persistence table. advtrains.atc is created by init.lua when it loads the save file.
atc.controllers = {}
function atc.load_data(data)
	local temp = data and data.controllers or {}
	--transcode atc controller data to node hashes: table access times for numbers are far less than for strings
	for pts, data in pairs(temp) do
		if type(pts)=="number" then
			pts=minetest.pos_to_string(minetest.get_position_from_hash(pts))
		end
		atc.controllers[pts] = data
	end
end
function atc.save_data()
	return {controllers = atc.controllers}
end
--contents: {command="...", arrowconn=0-15 where arrow points}

--general

function atc.send_command(pos, par_tid)
	local pts=minetest.pos_to_string(pos)
	if atc.controllers[pts] then
		--atprint("Called send_command at "..pts)
		local train_id = par_tid or advtrains.detector.on_node[pts]
		if train_id then
			if advtrains.trains[train_id] then
				--atprint("send_command inside if: "..sid(train_id))
				atc.train_reset_command(train_id)
				local arrowconn=atc.controllers[pts].arrowconn
				local train=advtrains.trains[train_id]
				for index, ppos in pairs(train.path) do
					if vector.equals(advtrains.round_vector_floor_y(ppos), pos) then
						advtrains.trains[train_id].atc_arrow =
								vector.equals(
										advtrains.dirCoordSet(pos, arrowconn),
										advtrains.round_vector_floor_y(train.path[index+train.movedir])
								)
						advtrains.trains[train_id].atc_command=atc.controllers[pts].command
						atprint("Sending ATC Command: ", atc.controllers[pts].command)
						return true
					end
				end
				atwarn("ATC rail at", pos, ": Rail not on train's path! Can't determine arrow direction. Assuming +!")
				advtrains.trains[train_id].atc_arrow=true
				advtrains.trains[train_id].atc_command=atc.controllers[pts].command
				atprint("Sending ATC Command: ", atc.controllers[pts].command)
			else
				atwarn("ATC rail at", pos, ": Sending command failed: The train",train_id,"does not exist. This seems to be a bug.")
			end
		else
			atwarn("ATC rail at", pos, ": Sending command failed: There's no train at this position. This seems to be a bug.")
		end
	else
		atwarn("ATC rail at", pos, ": Sending command failed: Entry for controller not found.")
		atwarn("ATC rail at", pos, ": Please visit controller and click 'Save'")
	end
	return false
end

function atc.train_reset_command(train_id)
	advtrains.trains[train_id].atc_command=nil
	advtrains.trains[train_id].atc_delay=0
	advtrains.trains[train_id].atc_brake_target=nil
	advtrains.trains[train_id].atc_wait_finish=nil
	advtrains.trains[train_id].atc_arrow=nil
end

--nodes
local idxtrans={static=1, mesecon=2, digiline=3}
local apn_func=function(pos, node)
	advtrains.ndb.update(pos, node)
	local meta=minetest.get_meta(pos)
	if meta then
		meta:set_string("infotext", attrans("ATC controller, unconfigured."))
		meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
	end
end

advtrains.atc_function = function(def, preset, suffix, rotation)
		return {
			after_place_node=apn_func,
			after_dig_node=function(pos)
				return advtrains.pcall(function()
					advtrains.invalidate_all_paths(pos)
					advtrains.ndb.clear(pos)
					local pts=minetest.pos_to_string(pos)
					atc.controllers[pts]=nil
				end)
			end,
			on_receive_fields = function(pos, formname, fields, player)
				return advtrains.pcall(function()
					if advtrains.is_protected(pos, player:get_player_name()) then
						minetest.record_protection_violation(pos, player:get_player_name())
						return
					end
					local meta=minetest.get_meta(pos)
					if meta then
						if not fields.save then 
							--maybe only the dropdown changed
							if fields.mode then
								meta:set_string("mode", idxtrans[fields.mode])
								if fields.mode=="digiline" then
									meta:set_string("infotext", attrans("ATC controller, mode @1\nChannel: @2", fields.mode, meta:get_string("command")) )
								else
									meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", fields.mode, meta:get_string("command")) )
								end
								meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
							end
							return
						end
						meta:set_string("mode", idxtrans[fields.mode])
						meta:set_string("command", fields.command)
						meta:set_string("command_on", fields.command_on)
						meta:set_string("channel", fields.channel)
						if fields.mode=="digiline" then
							meta:set_string("infotext", attrans("ATC controller, mode @1\nChannel: @2", fields.mode, meta:get_string("command")) )
						else
							meta:set_string("infotext", attrans("ATC controller, mode @1\nCommand: @2", fields.mode, meta:get_string("command")) )
						end
						meta:set_string("formspec", atc.get_atc_controller_formspec(pos, meta))
						
						local pts=minetest.pos_to_string(pos)
						local _, conn1=advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
						atc.controllers[pts]={command=fields.command, arrowconn=conn1}
						if advtrains.detector.on_node[pts] then
							atc.send_command(pos)
						end
					end
				end)
			end,
			advtrains = {
				on_train_enter = function(pos, train_id)
					atc.send_command(pos)
				end,
			},
		}
end

function atc.get_atc_controller_formspec(pos, meta)
	local mode=tonumber(meta:get_string("mode")) or 1
	local command=meta:get_string("command")
	local command_on=meta:get_string("command_on")
	local channel=meta:get_string("channel")
	local formspec="size[8,6]"..
		"dropdown[0,0;3;mode;static,mesecon,digiline;"..mode.."]"
	if mode<3 then
		formspec=formspec.."field[0.5,1.5;7,1;command;"..attrans("Command")..";"..minetest.formspec_escape(command).."]"
		if tonumber(mode)==2 then
			formspec=formspec.."field[0.5,3;7,1;command_on;"..attrans("Command (on)")..";"..minetest.formspec_escape(command_on).."]"
		end
	else
		formspec=formspec.."field[0.5,1.5;7,1;channel;"..attrans("Digiline channel")..";"..minetest.formspec_escape(channel).."]"
	end
	return formspec.."button_exit[0.5,4.5;7,1;save;"..attrans("Save").."]"
end

--from trainlogic.lua train step
local matchptn={
	["SM"]=function(id, train)
		train.tarvelocity=train.max_speed
		return 2
	end,
	["S([0-9]+)"]=function(id, train, match)
		train.tarvelocity=tonumber(match)
		return #match+1
	end,
	["B([0-9]+)"]=function(id, train, match)
		if train.velocity>tonumber(match) then
			train.atc_brake_target=tonumber(match)
			if train.tarvelocity>train.atc_brake_target then
				train.tarvelocity=train.atc_brake_target
			end
		end
		return #match+1
	end,
	["W"]=function(id, train)
		train.atc_wait_finish=true
		return 1
	end,
	["D([0-9]+)"]=function(id, train, match)
		train.atc_delay=tonumber(match)
		return #match+1
	end,
	["R"]=function(id, train)
		if train.velocity<=0 then
			train.movedir=train.movedir*-1
			train.atc_arrow = not train.atc_arrow
		else
			atwarn(sid(id), attrans("ATC Reverse command warning: didn't reverse train, train moving!"))
		end
		return 1
	end,
	["O([LRC])"]=function(id, train, match)
		local tt={L=-1, R=1, C=0}
		local arr=train.atc_arrow and 1 or -1
		train.door_open = tt[match]*arr*train.movedir
		return 2
	end,
}

function atc.execute_atc_command(id, train)
	--strip whitespaces
	local command=string.match(train.atc_command, "^%s*(.*)$")
	
	
	if string.match(command, "^%s*$") then
		train.atc_command=nil
		return
	end
	--conditional statement?
	local is_cond, cond_applies, compare
	local cond, rest=string.match(command, "^I([%+%-])(.+)$")
	if cond then
		is_cond=true
		if cond=="+" then
			cond_applies=train.atc_arrow
		end
		if cond=="-" then
			cond_applies=not train.atc_arrow
		end
	else