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--[[
Advanced Trains - Minetest Mod

Copyright (C) 2016-2020  Moritz Blei (orwell96) and contributors

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

]]

local lot = os.clock()
minetest.log("action", "[advtrains] Loading...")

-- There is no need to support 0.4.x anymore given that the compatitability with it is already broken by 1bb1d825f46af3562554c12fba35a31b9f7973ff
attrans = minetest.get_translator ("advtrains")

--advtrains
advtrains = {trains={}, player_to_train_mapping={}}

-- =======================Development/debugging settings=====================
-- DO NOT USE FOR NORMAL OPERATION
local DUMP_DEBUG_SAVE = false
-- dump the save files in human-readable format into advtrains_DUMP

local GENERATE_ATRICIFIAL_LAG = false
local HOW_MANY_LAG = 1.0
-- Simulate a higher server step interval, as it occurs when the server is on high load

advtrains.IGNORE_WORLD = false
-- Run advtrains without respecting the world map
-- - No world collision checks occur
-- - The NDB forcibly places all nodes stored in it into the world regardless of the world's content.
-- - Rails do not set the 'attached_node' group
-- This mode can be useful for debugging/testing a world without the map data available
-- In this case, choose 'singlenode' as mapgen

local NO_SAVE = false
-- Do not save any data to advtrains save files

-- ==========================================================================

-- Use a global slowdown factor to slow down train movements. Now a setting
advtrains.DTIME_LIMIT = tonumber(minetest.settings:get("advtrains_dtime_limit")) or 0.2
advtrains.SAVE_INTERVAL = tonumber(minetest.settings:get("advtrains_save_interval")) or 60

--Constant for maximum connection value/division of the circle
AT_CMAX = 16

-- get wagon loading range
advtrains.wagon_load_range = tonumber(minetest.settings:get("advtrains_wagon_load_range"))
if not advtrains.wagon_load_range then
	advtrains.wagon_load_range = tonumber(minetest.settings:get("active_block_range"))*16
end

--pcall
local no_action=false

local function reload_saves()
	atwarn("Restoring saved state in 1 second...")
	no_action=true
	advtrains.lock_path_inval = false
	--read last save state and continue, as if server was restarted
	for aoi, le in pairs(minetest.luaentities) do
		if le.is_wagon then
			le.object:remove()
		end
	end
	minetest.after(1, function()
		advtrains.load()
		atwarn("Reload successful!")
		advtrains.ndb.restore_all()
	end)
end

advtrains.modpath = minetest.get_modpath("advtrains")

--Advtrains dump (special treatment of pos and sigd)
function atdump(t, intend)
	local str
	if type(t)=="table" then
		if t.x and t.y and t.z then
			str=minetest.pos_to_string(t)
		elseif t.p and t.s then -- interlocking sigd
			str="S["..minetest.pos_to_string(t.p).."/"..t.s.."]"
		elseif advtrains.lines and t.s and t.m then -- RwT
			str=advtrains.lines.rwt.to_string(t)
		else
			str="{"
			local intd = (intend or "") .. "  "
			for k,v in pairs(t) do
				if type(k)~="string" or not string.match(k, "^path[_]?") then
					-- do not print anything path-related
					str = str .. "\n" .. intd .. atdump(k, intd) .. " = " ..atdump(v, intd)
				end
			end
			str = str .. "\n" .. (intend or "") .. "}"
		end
	elseif type(t)=="boolean" then
		if t then
			str="true"
		else
			str="false"
		end
	elseif type(t)=="function" then
		str="<function>"
	elseif type(t)=="userdata" then
		str="<userdata>"
	else
		str=""..t
	end
	return str
end

function advtrains.print_concat_table(a)
	local str=""
	local stra=""
	local t
	for i=1,20 do
		t=a[i]
		if t==nil then
			stra=stra.."nil "
		else
			str=str..stra
			stra=""
			str=str..atdump(t).." "
		end
	end
	return str
end

atprint=function() end
atlog=function(t, ...)
	local text=advtrains.print_concat_table({t, ...})
	minetest.log("action", "[advtrains]"..text)
end
atwarn=function(t, ...)
	local text=advtrains.print_concat_table({t, ...})
	minetest.log("warning", "[advtrains]"..text)
	minetest.chat_send_all("[advtrains] -!- "..text)
end
sid=function(id) if id then return string.sub(id, -6) end end


--ONLY use this function for temporary debugging. for consistent debug prints use atprint
atdebug=function(t, ...)
	local text=advtrains.print_concat_table({t, ...})
	minetest.log("action", "[advtrains]"..text)
	minetest.chat_send_all("[advtrains]"..text)
end

if minetest.settings:get_bool("advtrains_enable_debugging") then
	atprint=function(t, ...)
		local context=advtrains.atprint_context_tid or ""
		if not context then return end
		local text=advtrains.print_concat_table({t, ...})
		advtrains.drb_record(context, text)
		
		--atlog("@@",advtrains.atprint_context_tid,t,...)
	end
	dofile(advtrains.modpath.."/debugringbuffer.lua")
	
end

function assertt(var, typ)
	if type(var)~=typ then
		error("Assertion failed, variable has to be of type "..typ)
	end
end

dofile(advtrains.modpath.."/helpers.lua");
--dofile(advtrains.modpath.."/debugitems.lua");

advtrains.meseconrules = 
{{x=0,  y=0,  z=-1},
 {x=1,  y=0,  z=0},
 {x=-1, y=0,  z=0},
 {x=0,  y=0,  z=1},
 {x=1,  y=1,  z=0},
 {x=1,  y=-1, z=0},
 {x=-1, y=1,  z=0},
 {x=-1, y=-1, z=0},
 {x=0,  y=1,  z=1},
 {x=0,  y=-1, z=1},
 {x=0,  y=1,  z=-1},
 {x=0,  y=-1, z=-1},
 {x=0, y=-2, z=0}}

advtrains.fpath=minetest.get_worldpath().."/advtrains"

dofile(advtrains.modpath.."/path.lua")
dofile(advtrains.modpath.."/trainlogic.lua")
dofile(advtrains.modpath.."/trainhud.lua")
dofile(advtrains.modpath.."/trackplacer.lua")
dofile(advtrains.modpath.."/copytool.lua")
dofile(advtrains.modpath.."/tracks.lua")
dofile(advtrains.modpath.."/occupation.lua")
dofile(advtrains.modpath.."/atc.lua")
dofile(advtrains.modpath.."/wagons.lua")
dofile(advtrains.modpath.."/protection.lua")

dofile(advtrains.modpath.."/trackdb_legacy.lua")
dofile(advtrains.modpath.."/nodedb.lua")
dofile(advtrains.modpath.."/couple.lua")

dofile(advtrains.modpath.."/signals.lua")
dofile(advtrains.modpath.."/misc_nodes.lua")
dofile(advtrains.modpath.."/crafting.lua")
dofile(advtrains.modpath.."/craft_items.lua")

dofile(advtrains.modpath.."/log.lua")
dofile(advtrains.modpath.."/passive.lua")
if mesecon then
	dofile(advtrains.modpath.."/p_mesecon_iface.lua")
end


dofile(advtrains.modpath.."/lzb.lua")


--load/save

-- backup variables, used if someone should accidentally delete a sub-mod
-- As of version 4, only used once during migration from version 3 to 4
-- Since version 4, each of the mods stores a separate save file.
local MDS_interlocking, MDS_lines


advtrains.fpath=minetest.get_worldpath().."/advtrains"
dofile(advtrains.modpath.."/log.lua")
function advtrains.read_component(name)
	local path = advtrains.fpath.."_"..name
	minetest.log("action", "[advtrains] loading "..path)
	local file, err = io.open(path, "r")
	if not file then
		minetest.log("warning", " Failed to read advtrains save data from file "..path..": "..(err or "Unknown Error"))
		minetest.log("warning", " (this is normal when first enabling advtrains on this world)")
		return
	end
	local tbl =  minetest.deserialize(file:read("*a"))
	file:close()
	return tbl
end

function advtrains.avt_load()
	-- check for new, split advtrains save file
	
	local version = advtrains.read_component("version")
	local tbl
	if version and version == 4 then
		advtrains.load_version_4()
		return
	-- NOTE: From here, legacy loading code!
	elseif version and version == 3 then
		-- we are dealing with the split-up system
		minetest.log("action", "[advtrains] loading savefiles version 3")
		local il_save = {
			tcbs = true,
			ts = true,
			signalass = true,
			rs_locks = true,
			rs_callbacks = true,
			influence_points = true,
			npr_rails = true,
		}
		tbl={
			trains = true,
			wagon_save = true,
			ptmap = true,
			atc = true,
			ndb = true,		
			lines = true,
			version = 2,
		}
		for i,k in pairs(il_save) do
			il_save[i] = advtrains.read_component("interlocking_"..i)
		end
		for i,k in pairs(tbl) do
			tbl[i] = advtrains.read_component(i)
		end
		tbl["interlocking"] = il_save
	else	
		local file, err = io.open(advtrains.fpath, "r")
		if not file then
			minetest.log("warning", " Failed to read advtrains save data from file "..advtrains.fpath..": "..(err or "Unknown Error"))
			minetest.log("warning", " (this is normal when first enabling advtrains on this world)")
			return
		else
			tbl = minetest.deserialize(file:read("*a"))
			file:close()
		end
	end
	if type(tbl) == "table" then
		if tbl.version then
			--congrats, we have the new save format.
			advtrains.trains = tbl.trains
			--Save the train id into the train table to avoid having to pass id around
			for id, train in pairs(advtrains.trains) do
				train.id = id
			end
			advtrains.wagons = tbl.wagon_save
			advtrains.player_to_train_mapping = tbl.ptmap or {}
			advtrains.ndb.load_data_pre_v4(tbl.ndb)
			advtrains.atc.load_data(tbl.atc)
			if advtrains.interlocking then
				advtrains.interlocking.db.load(tbl.interlocking)
			else
				MDS_interlocking = tbl.interlocking
			end
			if advtrains.lines then
				advtrains.lines.load(tbl.lines)
			else
				MDS_lines = tbl.lines
			end
			--remove wagon_save entries that are not part of a train
			local todel=advtrains.merge_tables(advtrains.wagon_save)
			for tid, train in pairs(advtrains.trains) do
				train.id = tid
				for _, wid in ipairs(train.trainparts) do
					todel[wid]=nil
				end
			end
			for wid, _ in pairs(todel) do
				atwarn("Removing unused wagon", wid, "from wagon_save table.")
				advtrains.wagon_save[wid]=nil
			end
		else
			--oh no, its the old one...
			advtrains.trains=tbl
			--load ATC
			advtrains.fpath_atc=minetest.get_worldpath().."/advtrains_atc"
			local file, err = io.open(advtrains.fpath_atc, "r")
			if not file then
				local er=err or "Unknown Error"
				atprint("Failed loading advtrains atc save file "..er)
			else
				local tbl = minetest.deserialize(file:read("*a"))
				if type(tbl) == "table" then
					advtrains.atc.controllers=tbl.controllers
				end
				file:close()
			end
			--load wagon saves
			advtrains.fpath_ws=minetest.get_worldpath().."/advtrains_wagon_save"
			local file, err = io.open(advtrains.fpath_ws, "r")
			if not file then
				local er=err or "Unknown Error"
				atprint("Failed loading advtrains save file "..er)
			else
				local tbl = minetest.deserialize(file:read("*a"))
				if type(tbl) == "table" then
					advtrains.wagon_save=tbl
				end
				file:close()
			end
		end
	else
		minetest.log("error", " Failed to deserialize advtrains save data: Not a table!")
	end
	-- moved from advtrains.load()
	atlatc.load_pre_v4()
	-- end of legacy loading code
end

function advtrains.load_version_4()
	minetest.log("action", "[advtrains] loading savefiles version 4 (serialize_lib)")

	--== load core ==
	local at_save = serialize_lib.load_atomic(advtrains.fpath.."_core.ls")
	if at_save then
		advtrains.trains = at_save.trains
		--Save the train id into the train table to avoid having to pass id around
		for id, train in pairs(advtrains.trains) do
			train.id = id
		end
		advtrains.wagons = at_save.wagons
		advtrains.player_to_train_mapping = at_save.ptmap or {}
		advtrains.atc.load_data(at_save.atc)

		--remove wagon_save entries that are not part of a train
		local todel=advtrains.merge_tables(advtrains.wagon_save)
		for tid, train in pairs(advtrains.trains) do
			train.id = tid
			for _, wid in ipairs(train.trainparts) do
				todel[wid]=nil
			end
		end
		for wid, _ in pairs(todel) do
			atwarn("Removing unused wagon", wid, "from wagon_save table.")
			advtrains.wagon_save[wid]=nil
		end
	end
	--== load ndb
	serialize_lib.load_atomic(advtrains.fpath.."_ndb4.ls", advtrains.ndb.load_callback)
	
	--== load interlocking ==
	if advtrains.interlocking then
		local il_save = serialize_lib.load_atomic(advtrains.fpath.."_interlocking.ls")
		if il_save then
			advtrains.interlocking.db.load(il_save)
		end
	end
	
	--== load lines ==
	if advtrains.lines then
		local ln_save = serialize_lib.load_atomic(advtrains.fpath.."_lines.ls")
		if ln_save then
			advtrains.lines.load(ln_save)
		end
	end
	
	--== load luaatc ==
	if atlatc then
		local la_save = serialize_lib.load_atomic(advtrains.fpath.."_atlatc.ls")
		if la_save then
			atlatc.load(la_save)
		end
	end
end

advtrains.save_component = function (tbl, name)
	-- Saves each component of the advtrains file separately
	--
	-- required for now to shrink the advtrains db to overcome lua
	-- limitations.
	-- Note: as of version 4, only used for the "advtrains_version" file
	local datastr = minetest.serialize(tbl)
	if not datastr then
		minetest.log("error", " Failed to serialize advtrains save data!")
		return
	end
	local path = advtrains.fpath.."_"..name