src/guiPasswordChange.h


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/*
Part of Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2013 Ciaran Gultnieks <ciaran@ciarang.com>

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef GUIPASSWORDCHANGE_HEADER
#define GUIPASSWORDCHANGE_HEADER

#include "irrlichttypes_extrabloated.h"
#include "modalMenu.h"
#include "client.h"
#include <string>

class GUIPasswordChange : public GUIModalMenu
{
public:
	GUIPasswordChange(gui::IGUIEnvironment* env,
			gui::IGUIElement* parent, s32 id,
			IMenuManager *menumgr,
			Client* client);
	~GUIPasswordChange();
	
	void removeChildren();
	/*
		Remove and re-add (or reposition) stuff
	*/
	void regenerateGui(v2u32 screensize);

	void drawMenu();

	bool acceptInput();

	bool OnEvent(const SEvent& event);
	
private:
	Client* m_client;

};

#endif
--trackplacer.lua
--holds code for the track-placing system. the default 'track' item will be a craftitem that places rails as needed. this will neither place or change switches nor place vertical rails.

--all new trackplacer code
local tp={
	tracks={}
}

function tp.register_tracktype(nnprefix, n_suffix)
	tp.tracks[nnprefix]={
		default=n_suffix,
		single_conn={},
		double_conn={},
		--keys:conn1_conn2 (example:1_4)
		--values:{name=x, param2=x}
		twcycle={},
		twrotate={},--indexed by suffix, list, tells order of rotations
		modify={}
	}
end
function tp.add_double_conn(nnprefix, suffix, rotation, conns)
	local nodename=nnprefix.."_"..suffix..rotation
	for i=0,3 do
		tp.tracks[nnprefix].double_conn[((conns.conn1+4*i)%16).."_"..((conns.conn2+4*i)%16)]={name=nodename, param2=i}
		tp.tracks[nnprefix].double_conn[((conns.conn2+4*i)%16).."_"..((conns.conn1+4*i)%16)]={name=nodename, param2=i}
	end
	tp.tracks[nnprefix].modify[nodename]=true
end
function tp.add_single_conn(nnprefix, suffix, rotation, conns)
	local nodename=nnprefix.."_"..suffix..rotation
	for i=0,3 do
		tp.tracks[nnprefix].single_conn[((conns.conn1+4*i)%16)]={name=nodename, param2=i}
		tp.tracks[nnprefix].single_conn[((conns.conn2+4*i)%16)]={name=nodename, param2=i}
	end
	tp.tracks[nnprefix].modify[nodename]=true
end

function tp.add_worked(nnprefix, suffix, rotation, cycle_follows)
	tp.tracks[nnprefix].twcycle[suffix]=cycle_follows
	if not tp.tracks[nnprefix].twrotate[suffix] then tp.tracks[nnprefix].twrotate[suffix]={} end
	table.insert(tp.tracks[nnprefix].twrotate[suffix], rotation)
end


--[[
	rewrite algorithm.
	selection criteria: these will never be changed or even selected:
	- tracks being already connected on both sides
	- tracks that are already connected on one side but are not bendable to the desired position
	the following situations can occur:
	1. there are two more than two rails around
		1.1 there is one or more subset(s) that can be directly connected
			-> choose the first possibility
		2.2 not
			-> choose the first one and orient straight
	2. there's exactly 1 rail around
		-> choose and orient straight
	3. there's no rail around
		-> set straight
]]
function tp.find_already_connected(pos)--TODO vertical calculations(check node below)
	local function istrackandbc(pos, conn)
		local cnode=minetest.get_node(advtrains.dirCoordSet(pos, conn))
		local bconn=(conn+8)%16
		if advtrains.is_track_and_drives_on(cnode.name, advtrains.all_tracktypes) then
			local cconn1, cconn2=advtrains.get_track_connections(cnode.name, cnode.param2)
			return cconn1==bconn or cconn2==bconn
		end
		return false
	end
	local dnode=minetest.get_node(pos)
	local dconn1, dconn2=advtrains.get_track_connections(dnode.name, dnode.param2)
	local t={[true]="true", [false]="false"}
	if istrackandbc(pos, dconn1) and istrackandbc(pos, dconn2) then return dconn1, dconn2
	elseif istrackandbc(pos, dconn1) then return dconn1
	elseif istrackandbc(pos, dconn2) then return dconn2
	end
	return nil
end
function tp.rail_and_can_be_bent(originpos, conn, nnpref)
	local pos=advtrains.dirCoordSet(originpos, conn)
	local newdir=(conn+8)%16
	local node=minetest.get_node(pos)
	local tr=tp.tracks[nnpref]
	if not advtrains.is_track_and_drives_on(node.name, advtrains.all_tracktypes) then
		return false
	end
	--rail at other end?
	local adj1, adj2=tp.find_already_connected(pos)
	if adj1 and adj2 then
		return false--dont destroy existing track
	elseif adj1 and not adj2 then
		if tr.double_conn[adj1.."_"..newdir] then
			return true--if exists, connect new rail and old end
		end
		return false
	else
		if tr.single_conn[newdir] then--just rotate old rail to right orientation
			return true
		end
		return false
	end
end
function tp.bend_rail(originpos, conn, nnpref)
	local pos=advtrains.dirCoordSet(originpos, conn)
	local newdir=(conn+8)%16
	local node=minetest.get_node(pos)
	local tr=tp.tracks[nnpref]
	--is rail already connected? no need to bend.
	local conn1, conn2=advtrains.get_track_connections(node.name, node.param2)
	if newdir==conn1 or newdir==conn2 then
		return
	end
	--rail at other end?
	local adj1, adj2=tp.find_already_connected(pos)
	if adj1 and adj2 then
		return false--dont destroy existing track
	elseif adj1 and not adj2 then
		if tr.double_conn[adj1.."_"..newdir] then
			minetest.set_node(pos, tr.double_conn[adj1.."_"..newdir])
			return true--if exists, connect new rail and old end
		end
		return false
	else
		if tr.single_conn[newdir] then--just rotate old rail to right orientation
			minetest.set_node(pos, tr.single_conn[newdir])
			return true
		end
		return false
	end
end
function tp.placetrack(pos, nnpref)
	--1. find all rails that are likely to be connected
	local tr=tp.tracks[nnpref]
	local p_rails={}
	for i=0,15 do
		if tp.rail_and_can_be_bent(pos, i, nnpref) then
			p_rails[#p_rails+1]=i
		end
	end
	if #p_rails==0 then
		minetest.set_node(pos, {name=nnpref.."_"..tr.default})
	elseif #p_rails==1 then
		tp.bend_rail(pos, p_rails[1], nnpref)
		minetest.set_node(pos, tr.single_conn[p_rails[1]])
	else
		--iterate subsets
		for k1, conn1 in ipairs(p_rails) do
			for k2, conn2 in ipairs(p_rails) do
				if k1~=k2 then
					if (tr.double_conn[conn1.."_"..conn2]) then
						tp.bend_rail(pos, conn1, nnpref)
						tp.bend_rail(pos, conn2, nnpref)
						minetest.set_node(pos, tr.double_conn[conn1.."_"..conn2])
						return
					end
				end
			end
		end
		--not found
		tp.bend_rail(pos, p_rails[1], nnpref)
		minetest.set_node(pos, tr.single_conn[p_rails[1]])
	end
end


function tp.register_track_placer(nnprefix, imgprefix, dispname)
	minetest.register_craftitem(nnprefix.."_placer",{
		description = dispname,
		inventory_image = imgprefix.."_placer.png",
		wield_image = imgprefix.."_placer.png",
		groups={},
		on_place = function(itemstack, placer, pointed_thing)
		        local name = placer:get_player_name()
			if not name then
			   return itemstack
			end
			if pointed_thing.type=="node" then
				local pos=pointed_thing.above
				local upos=pointed_thing.under
				if minetest.is_protected(pos,name) and minetest.is_protected(upos,name) then
				   return itemstack
				end
				if minetest.registered_nodes[minetest.get_node(pos).name] and minetest.registered_nodes[minetest.get_node(pos).name].buildable_to
					and minetest.registered_nodes[minetest.get_node(upos).name] and minetest.registered_nodes[minetest.get_node(upos).name].walkable then
					tp.placetrack(pos, nnprefix)
					if not minetest.setting_getbool("creative_mode") then
						itemstack:take_item()
					end
				end
			end
			return itemstack
		end,
	})
end


minetest.register_craftitem("advtrains:trackworker",{
	description = "Track Worker Tool\n\nLeft-click: change rail type (straight/curve/switch)\nRight-click: rotate rail/bumper/signal/etc.",
	groups = {cracky=1}, -- key=name, value=rating; rating=1..3.
	inventory_image = "advtrains_trackworker.png",
	wield_image = "advtrains_trackworker.png",
	stack_max = 1,
	on_place = function(itemstack, placer, pointed_thing)
		local name = placer:get_player_name()
		if not name then
			return
		end
		if pointed_thing.type=="node" then
			local pos=pointed_thing.under
			if minetest.is_protected(pos, name) then
				return
			end
			local node=minetest.get_node(pos)

			--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
			if advtrains.is_train_at_pos(pos) then return end

			local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
			--print(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
			if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
				nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
				rotation = ""
				if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twrotate[suffix] then
					minetest.chat_send_player(placer:get_player_name(), "This node can't be rotated using the trackworker!")
					return
				end
			end
			local modext=tp.tracks[nnprefix].twrotate[suffix]

			if rotation==modext[#modext] then --increase param2
				minetest.set_node(pos, {name=nnprefix.."_"..suffix..modext[1], param2=(node.param2+1)%4})
				return
			else
				local modpos
				for k,v in pairs(modext) do if v==rotation then modpos=k end end
					if not modpos then
						minetest.chat_send_player(placer:get_player_name(), "This node can't be rotated using the trackworker!")
					return
				end
				minetest.set_node(pos, {name=nnprefix.."_"..suffix..modext[modpos+1], param2=node.param2})
			end
			advtrains.invalidate_all_paths()
		end
	end,
	on_use=function(itemstack, user, pointed_thing)
	        local name = user:get_player_name()
		if not name then
		   return
		end
		if pointed_thing.type=="node" then
			local pos=pointed_thing.under
			local node=minetest.get_node(pos)
			if minetest.is_protected(pos, name) then
			   return
			end
			
			--if not advtrains.is_track_and_drives_on(minetest.get_node(pos).name, advtrains.all_tracktypes) then return end
			if advtrains.is_train_at_pos(pos) then return end
			local nnprefix, suffix, rotation=string.match(node.name, "^(.+)_([^_]+)(_[^_]+)$")
	        --print(node.name.."\npattern recognizes:"..nodeprefix.." / "..railtype.." / "..rotation)
		    if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
			  nnprefix, suffix=string.match(node.name, "^(.+)_([^_]+)$")
			  rotation = ""
			  if not tp.tracks[nnprefix] or not tp.tracks[nnprefix].twcycle[suffix] then
			    minetest.chat_send_player(user:get_player_name(), "This node can't be changed using the trackworker!")
			    return
			  end
		    end
			local nextsuffix=tp.tracks[nnprefix].twcycle[suffix]
			minetest.set_node(pos, {name=nnprefix.."_"..nextsuffix..rotation, param2=node.param2})
			--invalidate trains
			advtrains.invalidate_all_paths()
		else
			print(name, dump(tp.tracks))
		end
	end,
})

--putting into right place
advtrains.trackplacer=tp