-- atc_rail.lua
-- registers and handles the ATC rail. Active component.
-- This is the only component that can interface with trains, so train interface goes here too.

--Using subtable
local r={}

function r.fire_event(pos, evtdata)
	
	local ph=minetest.pos_to_string(pos)
	local railtbl = atlatc.active.nodes[ph]
	
	if not railtbl then
		atwarn("LuaAutomation ATC interface rail at",ph,": Data not in memory! Please visit position and click 'Save'!")
		return
	end
	
	
	local arrowconn = railtbl.arrowconn
	if not arrowconn then
		atwarn("LuaAutomation ATC interface rail at",ph,": Incomplete Data! Please visit position and click 'Save'!")
		return
	end
	
	--prepare ingame API for ATC. Regenerate each time since pos needs to be known
	--If no train, then return false.
	local train_id=advtrains.get_train_at_pos(pos)
	local train, atc_arrow, tvel
	if train_id then train=advtrains.trains[train_id] end
	if train then 
		if not train.path then
			--we happened to get in between an invalidation step
			--delay
			atlatc.interrupt.add(0,pos,evtdata)
			return
		end
		local index = advtrains.path_lookup(train, pos)
				
		local iconnid = 1
		if index then
			iconnid = train.path_cn[index]
		else
			atwarn("ATC rail at", pos, ": Rail not on train's path! Can't determine arrow direction. Assuming +!")
		end
		atc_arrow = iconnid == 1
		
		tvel=train.velocity
	end
	local customfct={
		atc_send = function(cmd)
			if not train_id then return false end
			assertt(cmd, "string")
			advtrains.atc.train_set_command(train, cmd, atc_arrow)
			return true
		end,
		split_at_index = function(index, cmd)
			if not train_id then return false end
			assertt(cmd, "string")
			if type(index) ~= "number" then
				return false
			end
			local new_id = advtrains.split_train_at_index(train, index)
			if new_id then
				minetest.after(1,advtrains.atc.train_set_command,advtrains.trains[new_id], cmd, atc_arrow)
				return true
			end
			return false
		end,
		split_at_fc = function(cmd, len)
			assertt(cmd, "string")
			if not train_id then return false end
			local new_id, fc = advtrains.split_train_at_fc(train, false, len)
			if new_id then
				minetest.after(1,advtrains.atc.train_set_command,advtrains.trains[new_id], cmd, atc_arrow)
			end
			return fc or ""
		end,
		split_off_locomotive = function(cmd, len)
			assertt(cmd, "string")
			if not train_id then return false end
			local new_id, fc = advtrains.split_train_at_fc(train, true, len)
			if new_id then
				minetest.after(1,advtrains.atc.train_set_command,advtrains.trains[new_id], cmd, atc_arrow)
			end						
		end,
		train_length = function ()
			if not train_id then return false end
			return #train.trainparts
		end,
		step_fc = function()
			if not train_id then return false end
			advtrains.train_step_fc(train)
		end,
		set_shunt = function()
			if not train_id then return false end
			train.autocouple = true
		end,
		unset_shunt = function()
			if not train_id then return false end
			train.autocouple = nil
		end,
		set_autocouple = function ()
			if not train_id then return false end
			train.autocouple = true			
		end,
		unset_autocouple = function ()
			if not train_id then return false end
			train.autocouple = nil
		end,
		set_line = function(line)
			if type(line)~="string" and type(line)~="number" then
				return false
			end
			train.line = line .. ""
			minetest.after(0, advtrains.invalidate_path, train_id)
			return true
		end,
		get_line = function()
			return train.line
		end,
		set_rc = function(rc)
			if type(rc)~="string"then
				return false
			end
			train.routingcode = rc
			minetest.after(0, advtrains.invalidate_path, train_id)
			return true
		end,
		get_rc = function()
			return train.routingcode
		end,
		atc_reset = function(cmd)
			if not train_id then return false end
			assertt(cmd, "string")
			advtrains.atc.train_reset_command(train)
			return true
		end,
		atc_arrow = atc_arrow,
		atc_id = train_id,
		atc_speed = tvel,
		atc_set_text_outside = function(text)
			if not train_id then return false end
			if text then assertt(text, "string") end
			advtrains.trains[train_id].text_outside=text
			return true
		end,
		atc_set_text_inside = function(text)
			if not train_id then return false end
			if text then assertt(text, "string") end
			advtrains.trains[train_id].text_inside=text
			return true
		end,
	}
	
	atlatc.active.run_in_env(pos, evtdata, customfct)
	
end

if minetest.get_modpath("advtrains_train_track") ~= nil then
	advtrains.register_tracks("default", {
		nodename_prefix="advtrains_luaautomation:dtrack",
		texture_prefix="advtrains_dtrack_atc",
		models_prefix="advtrains_dtrack",
		models_suffix=".b3d",
		shared_texture="advtrains_dtrack_shared_atc.png",
		description=atltrans("LuaAutomation ATC Rail"),
		formats={},
		get_additional_definiton = function(def, preset, suffix, rotation)
			return {
				after_place_node = atlatc.active.after_place_node,
				after_dig_node = atlatc.active.after_dig_node,
				on_receive_fields = function(pos, ...)
					atlatc.active.on_receive_fields(pos, ...)
					--set arrowconn (for ATC)
					local ph=minetest.pos_to_string(pos)
					local _, conns=advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
					atlatc.active.nodes[ph].arrowconn=conns[1].c
				end,
				advtrains = atlatc.active.trackdef_advtrains_defs,
				luaautomation = {
					fire_event=r.fire_event
				},
				digiline = {
					receptor = {},
					effector = {
						action = atlatc.active.on_digiline_receive
					},
				},
			}
		end,
	}, advtrains.trackpresets.t_30deg_straightonly)
end

atlatc.rail = r
