minetest.git - modified minetest for gpcfs purposes

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--trainlogic.lua
--controls train entities stuff about connecting/disconnecting/colliding trains and other things


local benchmark=false
local bm={}
local bmlt=0
local bmsteps=0
local bmstepint=200
atprintbm=function(action, ta)
	if not benchmark then return end
	local t=(os.clock()-ta)*1000
	if not bm[action] then
		bm[action]=t
	else
		bm[action]=bm[action]+t
	end
	bmlt=bmlt+t
end
function endstep()
	if not benchmark then return end
	bmsteps=bmsteps-1
	if bmsteps<=0 then
		bmsteps=bmstepint
		for key, value in pairs(bm) do
			minetest.chat_send_all(key.." "..(value/bmstepint).." ms avg.")
		end
		minetest.chat_send_all("Total time consumed by all advtrains actions per step: "..(bmlt/bmstepint).." ms avg.")
		bm={}
		bmlt=0
	end
end

--acceleration for lever modes (trainhud.lua), per wagon
local t_accel_all={
	[0] = -10,
	[1] = -3,
	[2] = -0.5,
	[4] = 0,
}
--acceleration per engine
local t_accel_eng={
	[0] = 0,
	[1] = 0,
	[2] = 0,
	[4] = 2,
}

advtrains.mainloop_trainlogic=function(dtime)
	--build a table of all players indexed by pts. used by damage and door system.
	advtrains.playersbypts={}
	for _, player in pairs(minetest.get_connected_players()) do
		if not advtrains.player_to_train_mapping[player:get_player_name()] then
			--players in train are not subject to damage
			local ptspos=minetest.pos_to_string(vector.round(player:getpos()))
			advtrains.playersbypts[ptspos]=player
		end
	end
	--regular train step
	-- do in two steps: 
	--  a: predict path and add all nodes to the advtrains.detector.on_node table
	--  b: check for collisions based on these data
	--  (and more)
	local t=os.clock()
	advtrains.detector.on_node={}
	for k,v in pairs(advtrains.trains) do
		advtrains.atprint_context_tid=sid(k)
		advtrains.atprint_context_tid_full=k
		advtrains.train_step_a(k, v, dtime)
	end
	for k,v in pairs(advtrains.trains) do
		advtrains.atprint_context_tid=sid(k)
		advtrains.atprint_context_tid_full=k
		advtrains.train_step_b(k, v, dtime)
	end
	
	advtrains.atprint_context_tid=nil
	advtrains.atprint_context_tid_full=nil
	
	atprintbm("trainsteps", t)
	endstep()
end

minetest.register_on_joinplayer(function(player)
	return advtrains.pcall(function()
		local pname=player:get_player_name()
		local id=advtrains.player_to_train_mapping[pname]
		if id then
			local train=advtrains.trains[id]
			if not train then advtrains.player_to_train_mapping[pname]=nil return end
			--set the player to the train position.
			--minetest will emerge the area and load the objects, which then will call reattach_all().
			--because player is in mapping, it will not be subject to dying.
			player:setpos(train.last_pos_prev)
			--independent of this, cause all wagons of the train which are loaded to reattach their players
			--needed because already loaded wagons won't call reattach_all()
			for _,wagon in pairs(minetest.luaentities) do
				if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
					wagon:reattach_all()
				end
			end
		end
	end)
end)

minetest.register_on_dieplayer(function(player)
	return advtrains.pcall(function()
		local pname=player:get_player_name()
		local id=advtrains.player_to_train_mapping[pname]
		if id then
			local train=advtrains.trains[id]
			if not train then advtrains.player_to_train_mapping[pname]=nil return end
			for _,wagon in pairs(minetest.luaentities) do
				if wagon.is_wagon and wagon.initialized and wagon.train_id==id then
					--when player dies, detach him from the train
					--call get_off_plr on every wagon since we don't know which one he's on.
					wagon:get_off_plr(pname)
				end
			end
		end
	end)
end)
--[[
train step structure:


- legacy stuff
- preparing the initial path and creating index
- setting node coverage old indices
- handle velocity influences:
	- off-track
	- atc
	- player controls
	- environment collision
- update index = move
- create path
- call stay_node on all old positions to register train there, for collision system
- do less important stuff such as checking trainpartload or removing

-- break --
- Call enter_node and leave_node callbacks (required here because stay_node needs to be called on all trains first)
- handle train collisions

]]

function advtrains.train_step_a(id, train, dtime)
	--atprint("--- runcnt ",advtrains.mainloop_runcnt,": index",train.index,"end_index", train.end_index,"| max_iot", train.max_index_on_track, "min_iot", train.min_index_on_track, "<> pe_min", train.path_extent_min,"pe_max", train.path_extent_max)
	if train.min_index_on_track then
		assert(math.floor(train.min_index_on_track)==train.min_index_on_track)
	end
	--- 1. not exactly legacy. required now because of saving ---
	if not train.drives_on or not train.max_speed then
		advtrains.update_trainpart_properties(id)
	end
	--TODO check for all vars to be present
	if not train.velocity then
		train.velocity=0
	end
	if not train.movedir or (train.movedir~=1 and train.movedir~=-1) then
		train.movedir=1
	end
	--- 2. prepare initial path and index if needed ---
	if not train.index then train.index=0 end
	if not train.path then
		if not train.last_pos then
			--no chance to recover
			atwarn("Unable to restore train ",id,": missing last_pos")
			advtrains.trains[id]=nil
			return false
		end
		
		local node_ok=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(train.last_pos), train.drives_on)
		
		if node_ok==nil then
			--block not loaded, do nothing
			atprint("last_pos", advtrains.round_vector_floor_y(train.last_pos), "not loaded and not in ndb, waiting")
			return nil
		elseif node_ok==false then
			atprint("Unable to restore train ",id,": No rail at train's position")
			return false
		end
		
		if not train.last_pos_prev then
			--no chance to recover
			atwarn("Unable to restore train ",id,": missing last_pos_prev")
			advtrains.trains[id]=nil
			return false
		end
		
		local prevnode_ok=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(train.last_pos_prev), train.drives_on)
		
		if prevnode_ok==nil then
			--block not loaded, do nothing
			atprint("last_pos_prev", advtrains.round_vector_floor_y(train.last_pos_prev), "not loaded and not in ndb, waiting")
			return nil
		elseif prevnode_ok==false then
			atprint("Unable to restore train ",id,": No rail at train's position")
			return false
		end
		
		train.index=(train.restore_add_index or 0)+(train.savedpos_off_track_index_offset or 0)
		--restore_add_index is set by save() to prevent trains hopping to next round index. should be between -0.5 and 0.5
		--savedpos_off_track_index_offset is set if train went off track. see below.
		train.path={}
		train.path_dist={}
		train.path[0]=train.last_pos
		train.path[-1]=train.last_pos_prev
		train.path_dist[-1]=vector.distance(train.last_pos, train.last_pos_prev)
		train.path_extent_min=-1
		train.path_extent_max=0
		train.min_index_on_track=-1
		train.max_index_on_track=0
		
		--[[
		Bugfix for trains randomly ignoring ATC rails:
		- Paths have been invalidated. 1 gets executed and ensures an initial path
		- 2a sets train end index. The problem is that path_dist is not known for the whole path, so train end index will be nearly trainlen
		- Since the detector indices are also unknown, they get set to the new (wrong) train_end_index. Enter_node calls are not executed for the nodes that lie in between real end_index and trainlen.
		- The next step, mistake is recognized, train leaves some positions. From there, everything works again.
		To overcome this, we will generate the full required path here so that path_dist is available for get_train_end_index(). 
		]]
		advtrains.pathpredict(id, train)
	end
	
	--- 2a. set train.end_index which is required in different places, IF IT IS NOT SET YET by STMT afterwards. ---
	---   table entry to avoid triple recalculation ---
	if not train.end_index then
		train.end_index=advtrains.get_train_end_index(train)
	end
	
	--- 2b. set node coverage old indices ---
	
	train.detector_old_index = atround(train.index)
	train.detector_old_end_index = atround(train.end_index)
	
	--- 3. handle velocity influences ---
	local train_moves=(train.velocity~=0)
	local tarvel_cap
	
	if train.recently_collided_with_env then
		tarvel_cap=0
		if not train_moves then
			train.recently_collided_with_env=nil--reset status when stopped
		end
	end
	if train.locomotives_in_train==0 then
		tarvel_cap=0
	end
	
	--- 3a. this can be useful for debugs/warnings and is used for check_trainpartload ---
	local t_info, train_pos=sid(id), train.path[atround(train.index)]
	if train_pos then
		t_info=t_info.." @"..minetest.pos_to_string(train_pos)
		--atprint("train_pos:",train_pos)
	end
	
	--apply off-track handling:
	local front_off_track=train.max_index_on_track and train.index>train.max_index_on_track
	local back_off_track=train.min_index_on_track and train.end_index<train.min_index_on_track
	local pprint
	
	if front_off_track and back_off_track then--allow movement in both directions
		tarvel_cap=1
	elseif front_off_track then--allow movement only backward
		if train.movedir==1 then
			tarvel_cap=0
		end
		if train.movedir==-1 then
			tarvel_cap=1
		end
	elseif back_off_track then--allow movement only forward
		if train.movedir==1 then
			tarvel_cap=1
		end
		if train.movedir==-1 then
			tarvel_cap=0
		end
	end
	
	--interpret ATC command and apply auto-lever control when not actively controlled
	local trainvelocity = train.velocity
	if not train.lever then train.lever=3 end
	if train.active_control then
		advtrains.atc.train_reset_command(id)
	else
		if train.atc_brake_target and train.atc_brake_target>=trainvelocity then
			train.atc_brake_target=nil
		end
		if train.atc_wait_finish then
			if not train.atc_brake_target and train.velocity==train.tarvelocity then
				train.atc_wait_finish=nil
			end
		end
		if train.atc_command then
			if train.atc_delay<=0 and not train.atc_wait_finish then
				advtrains.atc.execute_atc_command(id, train)
			else
				train.atc_delay=train.atc_delay-dtime
			end
		end
		
		train.lever = 3
		if train.tarvelocity>trainvelocity then train.lever=4 end
		if train.tarvelocity<trainvelocity then
			if (train.atc_brake_target and train.atc_brake_target<trainvelocity) then
				train.lever=1
			else
				train.lever=2
			end
		end
	end
	
	if tarvel_cap and tarvel_cap<train.tarvelocity then
		train.tarvelocity=tarvel_cap
	end
	local tmp_lever = train.lever
	if tarvel_cap and trainvelocity>tarvel_cap then
		tmp_lever = 0
	end
	
	--- 3a. actually calculate new velocity ---
	if tmp_lever~=3 then
		local acc_all = t_accel_all[tmp_lever]
		local acc_eng = t_accel_eng[tmp_lever]
		local nwagons = #train.trainparts
		local accel = acc_all + (acc_eng*train.locomotives_in_train)/nwagons
		local vdiff = accel*dtime
		if not train.active_control then
			local tvdiff = train.tarvelocity - trainvelocity
			if math.abs(vdiff) > math.abs(tvdiff) then
				--applying this change would cross tarvelocity
				vdiff=tvdiff
			end
		end
		if tarvel_cap and trainvelocity<=tarvel_cap and trainvelocity+vdiff>tarvel_cap then
			vdiff = tarvel_cap - train.velocity
		end
		if trainvelocity+vdiff < 0 then
			vdiff = - trainvelocity
		end
		local mspeed = (train.max_speed or 10)
		if trainvelocity+vdiff > mspeed then
			vdiff = mspeed - trainvelocity
		end
		train.last_accel=(vdiff*train.movedir)
		train.velocity=train.velocity+vdiff
		if train.active_control then
			train.tarvelocity = train.velocity
		end
	else
		train.last_accel = 0
	end
	
	--- 4. move train ---
	
	train.index=train.index and train.index+(((train.velocity*train.movedir)/(train.path_dist[math.floor(train.index)] or 1))*dtime) or 0
	
	--- 4a. update train.end_index to the new position ---
	train.end_index=advtrains.get_train_end_index(train)
	
	--- 5. extend path as necessary ---
	--why this is an extra function, see under 3.
	advtrains.pathpredict(id, train, true)
	
	--- 5a. make pos/yaw available for possible recover calls ---
	if train.max_index_on_track<train.index then --whoops, train went too far. the saved position will be the last one that lies on a track, and savedpos_off_track_index_offset will hold how far to go from here
		train.savedpos_off_track_index_offset=atround(train.index)-train.max_index_on_track
		train.last_pos=train.path[train.max_index_on_track]
		train.last_pos_prev=train.path[train.max_index_on_track-1]
		atprint("train is off-track (front), last positions kept at", train.last_pos, "/", train.last_pos_prev)
	elseif train.min_index_on_track+1>train.index then --whoops, train went even more far. same behavior
		train.savedpos_off_track_index_offset=atround(train.index)-train.min_index_on_track
		train.last_pos=train.path[train.min_index_on_track+1]
		train.last_pos_prev=train.path[train.min_index_on_track]
		atprint("train is off-track (back), last positions kept at", train.last_pos, "/", train.last_pos_prev)
	else --regular case
		train.savedpos_off_track_index_offset=nil
		train.last_pos=train.path[math.floor(train.index+1)]
		train.last_pos_prev=train.path[math.floor(train.index)]
	end
	
	--- 5b. Remove path items that are no longer used ---
	-- Necessary since path items are no longer invalidated in save steps
	local path_pregen_keep=20
	local offtrack_keep=4
	local gen_front_keep= path_pregen_keep
	local gen_back_keep= atround(- train.trainlen - path_pregen_keep)
	
	local delete_min=math.min(train.max_index_on_track - offtrack_keep, atround(train.index)+gen_back_keep)
	local delete_max=math.max(train.min_index_on_track + offtrack_keep, atround(train.index)+gen_front_keep)
	
	if train.path_extent_min<delete_min then
		--atprint(sid(id),"clearing path min ",train.path_extent_min," to ",delete_min)
		for i=train.path_extent_min,delete_min-1 do
			train.path[i]=nil
			train.path_dist[i]=nil
		end
		train.path_extent_min=delete_min
		train.min_index_on_track=math.max(train.min_index_on_track, delete_min)
	end
	if train.path_extent_max>delete_max then
		--atprint(sid(id),"clearing path max ",train.path_extent_max," to ",delete_max)
		train.path_dist[delete_max]=nil
		for i=delete_max+1,train.path_extent_max do
			train.path[i]=nil
			train.path_dist[i]=nil
		end
		train.path_extent_max=delete_max
		train.max_index_on_track=math.min(train.max_index_on_track, delete_max)
	end
	
	--- 6b. call stay_node to register trains in the location table - actual enter_node stuff is done in step b ---
	
	local ifo, ibo = train.detector_old_index, train.detector_old_end_index
	local path=train.path
	
	for i=ibo, ifo do
		if path[i] then
			advtrains.detector.stay_node(path[i], id)
		end
	end
	
	--- 7. do less important stuff ---
	--check for any trainpart entities if they have been unloaded. do this only if train is near a player, to not spawn entities into unloaded areas
	
	train.check_trainpartload=(train.check_trainpartload or 0)-dtime
	local node_range=(math.max((minetest.settings:get("active_block_range") or 0),1)*16)
	if train.check_trainpartload<=0 then
		local ori_pos=train_pos --see 3a.
		--atprint("[train "..id.."] at "..minetest.pos_to_string(vector.round(ori_pos)))
		
		local should_check=false
		for _,p in ipairs(minetest.get_connected_players()) do
			should_check=should_check or (ori_pos and ((vector.distance(ori_pos, p:getpos())<node_range)))


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