aboutsummaryrefslogtreecommitdiff
path: root/advtrains_interlocking/tcb_ts_ui.lua
blob: 9aea18c1cdd77faf2fa21bcc9412e0953f4ede7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
-- Track Circuit Breaks and Track Sections - Player interaction

local players_assign_tcb = {}
local players_assign_signal = {}
local players_link_ts = {}

local ildb = advtrains.interlocking.db
local ilrs = advtrains.interlocking.route

local sigd_equal = advtrains.interlocking.sigd_equal

local lntrans = { "A", "B" }

local function sigd_to_string(sigd)
	return minetest.pos_to_string(sigd.p).." / "..lntrans[sigd.s]
end
advtrains.interlocking.sigd_to_string = sigd_to_string

minetest.register_node("advtrains_interlocking:tcb_node", {
	drawtype = "mesh",
	paramtype="light",
	paramtype2="facedir",
	walkable = false,
	selection_box = {
		type = "fixed",
		fixed = {-1/6, -1/2, -1/6, 1/6, 1/4, 1/6},
	},
	mesh = "at_il_tcb_node.obj",
	tiles = {"at_il_tcb_node.png"},
	description="Track Circuit Break",
	sunlight_propagates=true,
	groups = {
		cracky=3,
		not_blocking_trains=1,
		--save_in_at_nodedb=2,
		at_il_track_circuit_break = 1,
	},
	after_place_node = function(pos, node, player)
		local meta = minetest.get_meta(pos)
		meta:set_string("infotext", "Unconfigured Track Circuit Break, right-click to assign.")
	end,
	on_rightclick = function(pos, node, player)
		local pname = player:get_player_name()
		if not minetest.check_player_privs(pname, "interlocking") then
			minetest.chat_send_player(pname, "Insufficient privileges to use this!")
			return
		end
		
		local meta = minetest.get_meta(pos)
		local tcbpts = meta:get_string("tcb_pos")
		if tcbpts ~= "" then
			local tcbpos = minetest.string_to_pos(tcbpts)
			local tcb = ildb.get_tcb(tcbpos)
			if tcb then
				advtrains.interlocking.show_tcb_form(tcbpos, pname)
			else
				minetest.chat_send_player(pname, "This TCB has been removed. Please dig marker.")
			end
		else
			--unconfigured
			minetest.chat_send_player(pname, "Configuring TCB: Please punch the rail you want to assign this TCB to.")
			
			players_assign_tcb[pname] = pos
		end	
	end,
	--on_punch = function(pos, node, player)
	--	local meta = minetest.get_meta(pos)
	--	local tcbpts = meta:get_string("tcb_pos")
	--	if tcbpts ~= "" then
	--		local tcbpos = minetest.string_to_pos(tcbpts)
	--		advtrains.interlocking.show_tcb_marker(tcbpos)
	--	end	
	--end,
	can_dig = function(pos, player)
		if player == nil then return false end

		local pname = player:get_player_name()

		-- Those markers can only be dug when all adjacent TS's are set
		-- as EOI.
		local meta = minetest.get_meta(pos)
		local tcbpts = meta:get_string("tcb_pos")
		if tcbpts ~= "" then
			if not minetest.check_player_privs(pname, "interlocking") then
				minetest.chat_send_player(pname, "Insufficient privileges to use this!")
				return
			end			
			local tcbpos = minetest.string_to_pos(tcbpts)
			local tcb = ildb.get_tcb(tcbpos)
			if not tcb then return true end
			for connid=1,2 do
				if tcb[connid].ts_id or tcb[connid].signal then
					minetest.chat_send_player(pname, "Can't remove TCB: Both sides must have no track section and no signal assigned!")
					return false
				end
				if not ildb.may_modify_tcbs(tcb[connid]) then
					minetest.chat_send_player(pname, "Can't remove TCB: Side "..connid.." forbids modification (shouldn't happen).")
					return false
				end
			end
		end	
		return true
	end,
	after_dig_node = function(pos, oldnode, oldmetadata, player)
		if not oldmetadata or not oldmetadata.fields then return end
		local tcbpts = oldmetadata.fields.tcb_pos
		if tcbpts and tcbpts ~= "" then
			local tcbpos = minetest.string_to_pos(tcbpts)
			local success = ildb.remove_tcb(tcbpos)
			if success and player then
				minetest.chat_send_player(player:get_player_name(), "TCB has been removed.")
			else
				minetest.chat_send_player(player:get_player_name(), "Failed to remove TCB!")
				minetest.set_node(pos, oldnode)
				local meta = minetest.get_meta(pos)
				meta:set_string("tcb_pos", minetest.pos_to_string(tcbpos))
			end
		end
	end,
})


-- Crafting

-- set some fallbacks
local tcb_core = "default:mese_crystal"
local tcb_secondary = "default:mese_crystal_fragment"

--alternative recipe items
--core
if minetest.get_modpath("basic_materials") then
	tcb_core = "basic_materials:ic"
elseif minetest.get_modpath("technic") then
	tcb_core = "technic:control_logic_unit"
end
--print("TCB Core: "..tcb_core)
--secondary
if minetest.get_modpath("mesecons") then
	tcb_secondary = 'mesecons:wire_00000000_off'
end
--print("TCB Secondary: "..tcb_secondary)

minetest.register_craft({
	output = 'advtrains_interlocking:tcb_node 4',
	recipe = {
		{tcb_secondary,tcb_core,tcb_secondary},
		{'advtrains:dtrack_placer','','advtrains:dtrack_placer'}
	},
	--actually use track in the tcb recipe
	replacements = {
		{"advtrains:dtrack_placer","advtrains:dtrack_placer"},
		{"advtrains:dtrack_placer","advtrains:dtrack_placer"},
	}
})

--nil the temp crafting variables
tcb_core= nil
tcb_secondary = nil

minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
	local pname = player:get_player_name()
	if not minetest.check_player_privs(pname, "interlocking") then
		return
	end
	-- TCB assignment
	local tcbnpos = players_assign_tcb[pname]
	if tcbnpos then
		if vector.distance(pos, tcbnpos)<=20 then
			local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
			if node_ok and #conns == 2 then
				local ok = ildb.create_tcb(pos)
				
				if not ok then
					minetest.chat_send_player(pname, "Configuring TCB: TCB already exists at this position! It has now been re-assigned.")
				end
				
				ildb.sync_tcb_neighbors(pos, 1)
				ildb.sync_tcb_neighbors(pos, 2)
				
				local meta = minetest.get_meta(tcbnpos)
				meta:set_string("tcb_pos", minetest.pos_to_string(pos))
				meta:set_string("infotext", "TCB assigned to "..minetest.pos_to_string(pos))
				minetest.chat_send_player(pname, "Configuring TCB: Successfully configured TCB")
			else
				minetest.chat_send_player(pname, "Configuring TCB: This is not a normal two-connection rail! Aborted.")
			end
		else
			minetest.chat_send_player(pname, "Configuring TCB: Node is too far away. Aborted.")
		end
		players_assign_tcb[pname] = nil
	end
	
	-- Signal assignment
	local sigd = players_assign_signal[pname]
	if sigd then
		if vector.distance(pos, sigd.p)<=50 then
			local is_signal = minetest.get_item_group(node.name, "advtrains_signal") >= 2
			if is_signal then
				local ndef = minetest.registered_nodes[node.name]
				if ndef and ndef.advtrains and ndef.advtrains.set_aspect then
					if ndef.advtrains.supported_aspects and not ndef.advtrains.supported_aspects.dst_shift then
						local tcbs = ildb.get_tcbs(sigd)
						if tcbs then
							tcbs.signal = pos
							if not tcbs.signal_name then
								tcbs.signal_name = "Signal at "..minetest.pos_to_string(sigd.p)
							end
							if not tcbs.routes then
								tcbs.routes = {}
							end
							ildb.set_sigd_for_signal(pos, sigd)
							minetest.chat_send_player(pname, "Configuring TCB: Successfully assigned signal.")
							advtrains.interlocking.show_ip_form(pos, pname, true)
						else
							minetest.chat_send_player(pname, "Configuring TCB: Internal error, TCBS doesn't exist. Aborted.")
						end
					else
						minetest.chat_send_player(pname, "Configuring TCB: Cannot use distant signal. Aborted.")
					end
				else
					minetest.chat_send_player(pname, "Configuring TCB: Cannot use static signals for routesetting. Aborted.")
				end
			else
				minetest.chat_send_player(pname, "Configuring TCB: Not a compatible signal. Aborted.")
			end
		else
			minetest.chat_send_player(pname, "Configuring TCB: Node is too far away. Aborted.")
		end
		players_assign_signal[pname] = nil
	end
end)

-- TCB Form

local function mktcbformspec(tcbs, btnpref, offset, pname)
	local form = ""
	local ts
	if tcbs.ts_id then
		ts = ildb.get_ts(tcbs.ts_id)
	end
	if ts then
		form = form.."label[0.5,"..offset..";Side "..btnpref..": "..minetest.formspec_escape(ts.name).."]"
		form = form.."button[0.5,"..(offset+0.5)..";5,1;"..btnpref.."_gotots;Show track section]"
		if ildb.may_modify_tcbs(tcbs) then
			-- Note: the security check to prohibit those actions is located in database.lua in the corresponding functions.
			form = form.."button[0.5,"..(offset+1.5)..";2.5,1;"..btnpref.."_update;Update near TCBs]"
			form = form.."button[3  ,"..(offset+1.5)..";2.5,1;"..btnpref.."_remove;Remove from section]"
		end
	else
		tcbs.ts_id = nil
		form = form.."label[0.5,"..offset..";Side "..btnpref..": ".."End of interlocking]"
		form = form.."button[0.5,"..(offset+0.5)..";5,1;"..btnpref.."_makeil;Create Interlocked Track Section]"
		--if tcbs.section_free then
			--form = form.."button[0.5,"..(offset+1.5)..";5,1;"..btnpref.."_setlocked;Section is free]"
		--else
			--form = form.."button[0.5,"..(offset+1.5)..";5,1;"..btnpref.."_setfree;Section is blocked]"		
		--end
	end
	if tcbs.signal then
		form = form.."button[0.5,"..(offset+2.5)..";5,1;"..btnpref.."_sigdia;Signalling]"	
	else
		form = form.."button[0.5,"..(offset+2.5)..";5,1;"..btnpref.."_asnsig;Assign a signal]"
	end
	return form
end


function advtrains.interlocking.show_tcb_form(pos, pname)
	if not minetest.check_player_privs(pname, "interlocking") then
		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
		return
	end
	local tcb = ildb.get_tcb(pos)
	if not tcb then return end
	
	local form = "size[6,9] label[0.5,0.5;Track Circuit Break Configuration]"
	form = form .. mktcbformspec(tcb[1], "A", 1, pname)
	form = form .. mktcbformspec(tcb[2], "B", 5, pname)
	
	minetest.show_formspec(pname, "at_il_tcbconfig_"..minetest.pos_to_string(pos), form)
	advtrains.interlocking.show_tcb_marker(pos)
end

--helper: length of nil table is 0
local function nlen(t)
	if not t then return 0 end
	return #t
end


minetest.register_on_player_receive_fields(function(player, formname, fields)
	local pname = player:get_player_name()
	if not minetest.check_player_privs(pname, "interlocking") then
		return
	end
	local pts = string.match(formname, "^at_il_tcbconfig_(.+)$")
	local pos
	if pts then
		pos = minetest.string_to_pos(pts)
	end
	if pos and not fields.quit then
		local tcb = ildb.get_tcb(pos)
		if not tcb then return end
		local f_gotots = {fields.A_gotots, fields.B_gotots}
		local f_update = {fields.A_update, fields.B_update}
		local f_remove = {fields.A_remove, fields.B_remove}
		local f_makeil = {fields.A_makeil, fields.B_makeil}
		local f_setlocked = {fields.A_setlocked, fields.B_setlocked}
		local f_setfree = {fields.A_setfree, fields.B_setfree}
		local f_asnsig = {fields.A_asnsig, fields.B_asnsig}
		local f_sigdia = {fields.A_sigdia, fields.B_sigdia}
		
		for connid=1,2 do
			local tcbs = tcb[connid]
			if tcbs.ts_id then
				if f_gotots[connid] then
					advtrains.interlocking.show_ts_form(tcbs.ts_id, pname)
					return
				end
				if f_update[connid] then
					ildb.sync_tcb_neighbors(pos, connid)
				end
				if f_remove[connid] then
					ildb.remove_from_interlocking({p=pos, s=connid})
				end
			else
				if f_makeil[connid] then
					-- try sinc_tcb_neighbors first
					ildb.sync_tcb_neighbors(pos, connid)
					-- if that didn't work, create new section
					if not tcbs.ts_id then
						ildb.create_ts({p=pos, s=connid})
						ildb.sync_tcb_neighbors(pos, connid)
					end
				end
				-- non-interlocked
				if f_setfree[connid] then
					tcbs.section_free = true
				end
				if f_setlocked[connid] then
					tcbs.section_free = nil
				end
			end
			if f_asnsig[connid] and not tcbs.signal then
				minetest.chat_send_player(pname, "Configuring TCB: Please punch the signal to assign.")
				players_assign_signal[pname] = {p=pos, s=connid}
				minetest.close_formspec(pname, formname)
				return
			end
			if f_sigdia[connid] and tcbs.signal then
				advtrains.interlocking.show_signalling_form({p=pos, s=connid}, pname)
				return
			end

		end
		advtrains.interlocking.show_tcb_form(pos, pname)
	end

end)



-- TS Formspec

-- textlist selection temporary storage
local ts_pselidx = {}

function advtrains.interlocking.show_ts_form(ts_id, pname, sel_tcb)
	if not minetest.check_player_privs(pname, "interlocking") then
		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
		return
	end
	local ts = ildb.get_ts(ts_id)
	if not ts_id then return end
	
	local form = "size[10,10]label[0.5,0.5;Track Section Detail - "..ts_id.."]"
	form = form.."field[0.8,2;5.2,1;name;Section name;"..minetest.formspec_escape(ts.name).."]"
	form = form.."button[5.5,1.7;1,1;setname;Set]"
	local hint
	
	local strtab = {}
	for idx, sigd in ipairs(ts.tc_breaks) do
		strtab[#strtab+1] = minetest.formspec_escape(sigd_to_string(sigd))
		advtrains.interlocking.show_tcb_marker(sigd.p)
	end
	
	form = form.."textlist[0.5,3;5,3;tcblist;"..table.concat(strtab, ",").."]"
	
	if ildb.may_modify_ts(ts) then
		
		if players_link_ts[pname] then
			local other_id = players_link_ts[pname]
			local other_ts = ildb.get_ts(other_id)
			if other_ts then
				if ildb.may_modify_ts(other_ts) then
					form = form.."button[5.5,3;3.5,1;mklink;Join with "..minetest.formspec_escape(other_ts.name).."]"
					form = form.."button[9  ,3;0.5,1;cancellink;X]"
				end
			end
		else
			form = form.."button[5.5,3;4,1;link;Join into other section]"
			hint = 1
		end
		form = form.."button[5.5,4;4,1;dissolve;Dissolve Section]"
		form = form.."tooltip[dissolve;This will remove the track section and set all its end points to End Of Interlocking]"
		if sel_tcb then
			form = form.."button[5.5,5;4,1;del_tcb;Unlink selected TCB]"
			hint = 2
		end
	else
		hint=3
	end
	
	if ts.route then
		form = form.."label[0.5,6.1;Route is set: "..ts.route.rsn.."]"
	elseif ts.route_post then
		form = form.."label[0.5,6.1;Section holds "..#(ts.route_post.lcks or {}).." route locks.]"
	end
	-- occupying trains
	if ts.trains and #ts.trains>0 then
		form = form.."label[0.5,7.1;Trains on this section:]"
		form = form.."textlist[0.5,7.7;3,2;trnlist;"..table.concat(ts.trains, ",").."]"
	else
		form = form.."label[0.5,7.1;No trains on this section.]"
	end
	
	form = form.."button[5.5,7;4,1;reset;Reset section state]"
	
	if hint == 1 then
		form = form.."label[0.5,0.75;Use the 'Join' button to designate rail crosses and link not listed far-away TCBs]"
	elseif hint == 2 then
		form = form.."label[0.5,0.75;Unlinking a TCB will set it to non-interlocked mode.]"
	elseif hint == 3 then
		form = form.."label[0.5,0.75;You cannot modify track sections when a route is set or a train is on the section.]"
		--form = form.."label[0.5,1;Trying to unlink a TCB directly connected to this track will not work.]"
	end
	
	ts_pselidx[pname]=sel_tcb
	minetest.show_formspec(pname, "at_il_tsconfig_"..ts_id, form)
	
end


minetest.register_on_player_receive_fields(function(player, formname, fields)
	local pname = player:get_player_name()
	if not minetest.check_player_privs(pname, "interlocking") then
		return
	end
	-- independent of the formspec, clear this whenever some formspec event happens
	local tpsi = ts_pselidx[pname]
	ts_pselidx[pname] = nil
	
	local ts_id = string.match(formname, "^at_il_tsconfig_(.+)$")
	if ts_id and not fields.quit then
		local ts = ildb.get_ts(ts_id)
		if not ts then return end
		
		local sel_tcb
		if fields.tcblist then
			local tev = minetest.explode_textlist_event(fields.tcblist)
			sel_tcb = tev.index
			ts_pselidx[pname] = sel_tcb
		elseif tpsi then
			sel_tcb = tpsi
		end
		
		if ildb.may_modify_ts(ts) then
			if players_link_ts[pname] then
				if fields.cancellink then
					players_link_ts[pname] = nil
				elseif fields.mklink then
					ildb.link_track_sections(players_link_ts[pname], ts_id)
					players_link_ts[pname] = nil
				end
			end
			
			if fields.del_tcb and sel_tcb and sel_tcb > 0 and sel_tcb <= #ts.tc_breaks then
				if not ildb.remove_from_interlocking(ts.tc_breaks[sel_tcb]) then
					minetest.chat_send_player(pname, "Please unassign signal first!")
				end
				sel_tcb = nil
			end
			
			if fields.link then
				players_link_ts[pname] = ts_id
			end
			if fields.dissolve then
				ildb.dissolve_ts(ts_id)
				minetest.close_formspec(pname, formname)
				return
			end
		end
		
		if fields.setname then
			ts.name = fields.name
			if ts.name == "" then
				ts.name = "Section "..ts_id
			end
		end
		
		if fields.reset then
			-- User requested resetting the section
			-- Show him what this means...
			local form = "size[7,5]label[0.5,0.5;Reset track section]"
			form = form.."label[0.5,1;This will clear the list of trains\nand the routesetting status of this section.\nAre you sure?]"
			form = form.."button_exit[0.5,2.5;  5,1;reset;Yes]"
			form = form.."button_exit[0.5,3.5;  5,1;cancel;Cancel]"
			minetest.show_formspec(pname, "at_il_tsreset_"..ts_id, form)
			return
		end
		
		advtrains.interlocking.show_ts_form(ts_id, pname, sel_tcb)
		return
	end
	
	ts_id = string.match(formname, "^at_il_tsreset_(.+)$")
	if ts_id and fields.reset then
		local ts = ildb.get_ts(ts_id)
		if not ts then return end
		ts.trains = {}
		if ts.route_post then
			advtrains.interlocking.route.free_route_locks(ts_id, ts.route_post.locks)
		end
		ts.route_post = nil
		ts.route = nil
		for _, sigd in ipairs(ts.tc_breaks) do
			local tcbs = ildb.get_tcbs(sigd)
			advtrains.interlocking.update_signal_aspect(tcbs)
		end
		minetest.chat_send_player(pname, "Reset track section "..ts_id.."!")
	end
end)

-- TCB marker entities

-- table with objectRefs
local markerent = {}

minetest.register_entity("advtrains_interlocking:tcbmarker", {
	visual = "mesh",
	mesh = "trackplane.b3d",
	textures = {"at_il_tcb_marker.png"},
	collisionbox = {-1,-0.5,-1, 1,-0.4,1},
	visual_size = {x=10, y=10},
	on_punch = function(self)
		self.object:remove()
	end,
	on_rightclick = function(self, player)
		if self.tcbpos and player then
			advtrains.interlocking.show_tcb_form(self.tcbpos, player:get_player_name())
		end
	end,
	get_staticdata = function() return "STATIC" end,
	on_activate = function(self, sdata) if sdata=="STATIC" then self.object:remove() end end,
	static_save = false,
})

function advtrains.interlocking.show_tcb_marker(pos)
	--atdebug("showing tcb marker",pos)
	local tcb = ildb.get_tcb(pos)
	if not tcb then return end
	local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
	if not node_ok then return end
	local yaw = advtrains.conn_angle_median(conns[2].c, conns[1].c)
	
	local itex = {}
	for connid=1,2 do
		local tcbs = tcb[connid]
		local ts
		if tcbs.ts_id then
			ts = ildb.get_ts(tcbs.ts_id)
		end
		if ts then
			itex[connid] = ts.name
		else
			itex[connid] = "--EOI--"
		end
	end
	
	local pts = advtrains.roundfloorpts(pos)
	if markerent[pts] then
		markerent[pts]:remove()
	end
	
	local obj = minetest.add_entity(pos, "advtrains_interlocking:tcbmarker")
	if not obj then return end
	obj:set_yaw(yaw)
	obj:set_properties({
		infotext = "A = "..itex[1].."\nB = "..itex[2]
	})
	local le = obj:get_luaentity()
	if le then le.tcbpos = pos end
	
	markerent[pts] = obj
end

-- Signalling formspec - set routes a.s.o

-- textlist selection temporary storage
local sig_pselidx = {}
-- Players having a signalling form open
local p_open_sig_form = {}

function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, called_from_form_update)
	if not minetest.check_player_privs(pname, "train_operator") then
		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
		return
	end
	local hasprivs = minetest.check_player_privs(pname, "interlocking")
	local tcbs = ildb.get_tcbs(sigd)
	
	if not tcbs.signal then return end
	if not tcbs.signal_name then tcbs.signal_name = "Signal at "..minetest.pos_to_string(sigd.p) end
	if not tcbs.routes then tcbs.routes = {} end
	
	local form = "size[7,10.25]label[0.5,0.5;Signal at "..minetest.pos_to_string(sigd.p).."]"
	form = form.."field[0.8,1.5;5.2,1;name;Signal name;"..minetest.formspec_escape(tcbs.signal_name).."]"
	form = form.."button[5.5,1.2;1,1;setname;Set]"
	
	if tcbs.routeset then
		local rte = tcbs.routes[tcbs.routeset]
		if not rte then
			atwarn("Unknown route set from signal!")
			tcbs.routeset = nil
			return
		end
		form = form.."label[0.5,2.5;A route is requested from this signal:]"
		form = form.."label[0.5,3.0;"..minetest.formspec_escape(rte.name).."]"
		if tcbs.route_committed then
			form = form.."label[0.5,3.5;Route has been set.]"
		else
			form = form.."label[0.5,3.5;Waiting for route to be set...]"
			if tcbs.route_rsn then
				form = form.."label[0.5,4;"..minetest.formspec_escape(tcbs.route_rsn).."]"
			end
		end
		if not tcbs.route_auto then
			form = form.."button[0.5,7;  5,1;auto;Enable Automatic Working]"
		else
			form = form.."label[0.5,7  ;Automatic Working is active.]"
			form = form.."label[0.5,7.3;Route is re-set when a train passed.]"
			form = form.."button[0.5,7.7;  5,1;noauto;Disable Automatic Working]"
		end
		
		form = form.."button[0.5,6;  5,1;cancelroute;Cancel Route]"
	else
		if not tcbs.route_origin then
			local strtab = {}
			for idx, route in ipairs(tcbs.routes) do
				local clr = ""
				if route.ars then
					clr = "#FF5555"
					if route.ars.default then
						clr = "#55FF55"
					end
				end
				strtab[#strtab+1] = clr .. minetest.formspec_escape(route.name)
			end
			form = form.."label[0.5,2.5;Routes:]"
			form = form.."textlist[0.5,3;5,3;rtelist;"..table.concat(strtab, ",").."]"
			if sel_rte then
				form = form.."button[0.5,6;  5,1;setroute;Set Route]"
				form = form.."button[0.5,7;2,1;dsproute;Show]"
				if hasprivs then
					form = form.."button[3.5,7;2,1;editroute;Edit]"
				end
			else
				if tcbs.ars_disabled then
					form = form.."label[0.5,6  ;NOTE: ARS is disabled.]"
					form = form.."label[0.5,6.5;Routes are not automatically set.]"
				end
			end
			if hasprivs then
				form = form.."button[0.5,8;2.5,1;newroute;New Route]"
				form = form.."button[  3,8;2.5,1;unassign;Unassign Signal]"
				form = form..string.format("checkbox[0.5,8.75;ars;Automatic routesetting;%s]", not tcbs.ars_disabled)
				form = form..string.format("checkbox[0.5,9.25;dst;Distant signalling;%s]", not tcbs.nodst)
			end
		elseif sigd_equal(tcbs.route_origin, sigd) then
			-- something has gone wrong: tcbs.routeset should have been set...
			form = form.."label[0.5,2.5;Inconsistent state: route_origin is same TCBS but no route set. Try again.]"
			ilrs.cancel_route_from(sigd)
		else
			form = form.."label[0.5,2.5;Route is set over this signal by:\n"..sigd_to_string(tcbs.route_origin).."]"
			form = form.."label[0.5,4;Wait for this route to be cancelled in order to do anything here.]"
		end
	end	
	sig_pselidx[pname] = sel_rte
	minetest.show_formspec(pname, "at_il_signalling_"..minetest.pos_to_string(sigd.p).."_"..sigd.s, form)
	p_open_sig_form[pname] = sigd
	
	-- always a good idea to update the signal aspect
	if not called_from_form_update then
	-- FIX prevent a callback loop
		advtrains.interlocking.update_signal_aspect(tcbs)
	end
end

function advtrains.interlocking.update_player_forms(sigd)
	for pname, tsigd in pairs(p_open_sig_form) do
		if advtrains.interlocking.sigd_equal(sigd, tsigd) then
			advtrains.interlocking.show_signalling_form(sigd, pname, nil)
		end
	end
end


minetest.register_on_player_receive_fields(function(player, formname, fields)
	local pname = player:get_player_name()
	if not minetest.check_player_privs(pname, "train_operator") then
		return
	end
	local hasprivs = minetest.check_player_privs(pname, "interlocking")
	
	-- independent of the formspec, clear this whenever some formspec event happens
	local tpsi = sig_pselidx[pname]
	sig_pselidx[pname] = nil
	p_open_sig_form[pname] = nil
	
	local pts, connids = string.match(formname, "^at_il_signalling_([^_]+)_(%d)$")
	local pos, connid
	if pts then
		pos = minetest.string_to_pos(pts)
		connid = tonumber(connids)
		if not connid or connid<1 or connid>2 then return end
	end
	if pos and connid then
		local sigd = {p=pos, s=connid}
		local tcbs = ildb.get_tcbs(sigd)
		if not tcbs then return end

		if fields.quit then
			-- form quit: disable temporary ARS ignore
			tcbs.ars_ignore_next = nil
			return
		end

		local sel_rte
		if fields.rtelist then
			local tev = minetest.explode_textlist_event(fields.rtelist)
			sel_rte = tev.index
		elseif tpsi then
			sel_rte = tpsi
		end
		if fields.setname and fields.name and hasprivs then
			tcbs.signal_name = fields.name
		end
		if tcbs.routeset and fields.cancelroute then
			if tcbs.routes[tcbs.routeset] and tcbs.routes[tcbs.routeset].ars then
				tcbs.ars_ignore_next = true
			end
			-- if route committed, cancel route ts info
			ilrs.update_route(sigd, tcbs, nil, true)
		end
		if not tcbs.routeset then
			if fields.newroute and hasprivs then
				advtrains.interlocking.init_route_prog(pname, sigd)
				minetest.close_formspec(pname, formname)
				tcbs.ars_ignore_next = nil
				return
			end
			if sel_rte and tcbs.routes[sel_rte] then
				if fields.setroute then
					ilrs.update_route(sigd, tcbs, sel_rte)
				end
				if fields.dsproute then
					local t = os.clock()
					advtrains.interlocking.visualize_route(sigd, tcbs.routes[sel_rte], "disp_"..t)
					minetest.after(10, function() advtrains.interlocking.clear_visu_context("disp_"..t) end)
				end
				if fields.editroute and hasprivs then
					advtrains.interlocking.show_route_edit_form(pname, sigd, sel_rte)
					--local rte = tcbs.routes[sel_rte]
					--minetest.show_formspec(pname, formname.."_renroute_"..sel_rte, "field[name;Enter new route name;"..rte.name.."]")
					return
				end
			end
		end
		
		if fields.unassign and hasprivs then
			-- unassigning the signal from the tcbs
			-- only when no route is set.
			-- Routes and name remain saved, in case the player wants to reassign a new signal
			if not tcbs.routeset then
				local signal_pos = tcbs.signal
				ildb.set_sigd_for_signal(signal_pos, nil)
				tcbs.signal = nil
				tcbs.aspect = nil
				minetest.close_formspec(pname, formname)
				minetest.chat_send_player(pname, "Signal has been unassigned. Name and routes are kept for reuse.")
				return
			else
				minetest.chat_send_player(pname, "Please cancel route first!")
			end
		end
		
		if fields.ars then
			tcbs.ars_disabled = not minetest.is_yes(fields.ars)
		end

		if fields.dst then
			tcbs.nodst = not minetest.is_yes(fields.dst)
		end
		
		if fields.auto then
			tcbs.route_auto = true
		end
		if fields.noauto then
			tcbs.route_auto = false
		end
		
		advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, true)
		return
	end
	
	
	if not hasprivs then return end
	-- rename route
	local rind, rte_id
	pts, connids, rind = string.match(formname, "^at_il_signalling_([^_]+)_(%d)_renroute_(%d+)$")
	if pts then
		pos = minetest.string_to_pos(pts)
		connid = tonumber(connids)
		rte_id = tonumber(rind)
		if not connid or connid<1 or connid>2 then return end
	end
	if pos and connid and rind and fields.name then
		local sigd = {p=pos, s=connid}
		local tcbs = ildb.get_tcbs(sigd)
		if tcbs.routes[rte_id] then
			tcbs.routes[rte_id].name = fields.name
			advtrains.interlocking.show_signalling_form(sigd, pname)
		end
	end
end)