-- This version of the travelnet box allows to move up or down only.
-- The network name is determined automaticly from the position (x/z coordinates).
-- >utor: Sokomine
local S = travelnet.S;

travelnet.show_nearest_elevator = function( pos, owner_name, param2 )
	if( not( pos ) or not(pos.x) or not(pos.z) or not( owner_name )) then
		return;
	end

	if( not( travelnet.targets[ owner_name ] )) then
		minetest.chat_send_player( owner_name, S("Congratulations! This is your first elevator."..
			"You can build an elevator network by placing further elevators somewhere above "..
			"or below this one. Just make sure that the x and z coordinate are the same."));
		return;
	end

	local network_name = tostring( pos.x )..','..tostring( pos.z );
	-- will this be an elevator that will be added to an existing network?
	if( travelnet.targets[ owner_name ][ network_name ]
	  -- does the network have any members at all?
	  and next( travelnet.targets[ owner_name ][ network_name ], nil )) then
		minetest.chat_send_player( owner_name, S("This elevator will automaticly connect to the "..
			"other elevators you have placed at diffrent heights. Just enter a station name "..
			"and click on \"store\" to set it up. Or just punch it to set the height as station "..
			"name."));
		return;
	end

	local nearest_name = "";
	local nearest_dist = 100000000;
	local nearest_dist_x = 0;
	local nearest_dist_z = 0;
	for network_name, data in pairs( travelnet.targets[ owner_name ] ) do
		local station_name = next( data, nil );
		if( station_name and data[ station_name ][ "nr" ] and data[ station_name ].pos) then
			local station_pos = data[ station_name ].pos;
			local dist = math.ceil(math.sqrt(
					  ( station_pos.x - pos.x ) * ( station_pos.x - pos.x )
					+ ( station_pos.z - pos.z ) * ( station_pos.z - pos.z )));
			-- find the nearest one; store network_name and (minimal) distance
			if( dist < nearest_dist ) then
				nearest_dist = dist;
				nearest_dist_x = station_pos.x - pos.x;
				nearest_dist_z = station_pos.z - pos.z;
				nearest_name = network_name;
			end
		end
	end
	if( nearest_name ~= "" ) then
		local text = S("Your nearest elevator network is located").." ";
		-- in front of/behind
		if(    (param2==0 and nearest_dist_z>=0)or (param2==2 and nearest_dist_z<=0)) then
			text = text..tostring( math.abs(nearest_dist_z )).." "..S("m behind this elevator and");
		elseif((param2==1 and nearest_dist_x>=0)or (param2==3 and nearest_dist_x<=0)) then
			text = text..tostring( math.abs(nearest_dist_x )).." "..S("m behind this elevator and");
		elseif((param2==0 and nearest_dist_z< 0)or (param2==2 and nearest_dist_z> 0)) then
			text = text..tostring( math.abs(nearest_dist_z )).." "..S("m in front of this elevator and");
		elseif((param2==1 and nearest_dist_x< 0)or (param2==3 and nearest_dist_x> 0)) then
			text = text..tostring( math.abs(nearest_dist_x )).." "..S("m in front of this elevator and");
		else text = text..S(" ERROR");
		end
		text = text.." ";

		-- right/left
		if(    (param2==0 and nearest_dist_x< 0)or (param2==2 and nearest_dist_x> 0)) then
			text = text..tostring( math.abs(nearest_dist_x )).." "..S("m to the left");
		elseif((param2==1 and nearest_dist_z>=0)or (param2==3 and nearest_dist_z<=0)) then
			text = text..tostring( math.abs(nearest_dist_z )).." "..S("m to the left");
		elseif((param2==0 and nearest_dist_x>=0)or (param2==2 and nearest_dist_x<=0)) then
			text = text..tostring( math.abs(nearest_dist_x )).." "..S("m to the right");
		elseif((param2==1 and nearest_dist_z< 0)or (param2==3 and nearest_dist_z> 0)) then
			text = text..tostring( math.abs(nearest_dist_z )).." "..S("m to the right");
		else text = text..S(" ERROR");
		end

		minetest.chat_send_player( owner_name, text..
			S(", located at x").."="..tostring( pos.x+nearest_dist_x)..
			", z="..tostring( pos.z+nearest_dist_z)..
			". "..S("This elevator here will start a new shaft/network."));
	else
		minetest.chat_send_player( owner_name, S("This is your first elevator. It differs from "..
			"travelnet networks by only allowing movement in vertical direction (up or down). "..
			"All further elevators which you will place at the same x,z coordinates at differnt "..
			"heights will be able to connect to this elevator."));
	end
end


minetest.register_node("travelnet:elevator", {
	description = S("Elevator"),
	drawtype = "mesh",
	mesh = "travelnet_elevator.obj",
	sunlight_propagates = true,
	paramtype = 'light',
	paramtype2 = "facedir",
	wield_scale = {x=0.6, y=0.6, z=0.6},

	selection_box = {
		type = "fixed",
		fixed = { -0.5, -0.5, -0.5, 0.5, 1.5, 0.5 }
	},

	collision_box = {
		type = "fixed",
		fixed = {

			{ 0.48, -0.5,-0.5,  0.5,  0.5, 0.5},
			{-0.5 , -0.5, 0.48, 0.48, 0.5, 0.5}, 
			{-0.5,  -0.5,-0.5 ,-0.48, 0.5, 0.5},

			--groundplate to stand on
			{ -0.5,-0.5,-0.5,0.5,-0.48, 0.5}, 
		},
	},

	tiles = travelnet.tiles_elevator,

	inventory_image = travelnet.elevator_inventory_image,
	groups = {}, --cracky=1,choppy=1,snappy=1,

    light_source = 10,

    after_place_node  = function(pos, placer, itemstack)
	local meta = minetest.get_meta(pos);
        meta:set_string("infotext",       S("Elevator (unconfigured)"));
        meta:set_string("station_name",   "");
        meta:set_string("station_network","");
        meta:set_string("owner",          placer:get_player_name() );
        -- request initial data
        meta:set_string("formspec", 
                            "size[12,10]"..
                            "field[0.3,5.6;6,0.7;station_name;"..S("Name of this station:")..";]"..
--                            "field[0.3,6.6;6,0.7;station_network;Assign to Network:;]"..
--                            "field[0.3,7.6;6,0.7;owner_name;(optional) owned by:;]"..
                            "button_exit[6.3,6.2;1.7,0.7;station_set;"..S("Store").."]" );

       local p = {x=pos.x, y=pos.y+1, z=pos.z}
       local p2 = minetest.dir_to_facedir(placer:get_look_dir())
       minetest.add_node(p, {name="travelnet:elevator_top", paramtype2="facedir", param2=p2})
       travelnet.show_nearest_elevator( pos, placer:get_player_name(), p2 );
    end,
    
    on_receive_fields = travelnet.on_receive_fields,
    on_punch          = function(pos, node, puncher)
                             travelnet.update_formspec(pos, puncher:get_player_name())
    end,

    can_dig = function( pos, player )
                          return travelnet.can_dig( pos, player, 'elevator' )
    end,

    after_dig_node = function(pos, oldnode, oldmetadata, digger)
			  travelnet.remove_box( pos, oldnode, oldmetadata, digger )
    end,

    -- TNT and overenthusiastic DMs do not destroy elevators either
    on_blast = function(pos, intensity)
    end,

    -- taken from VanessaEs homedecor fridge
    on_place = function(itemstack, placer, pointed_thing)
       local pos  = pointed_thing.above;
       local node = minetest.get_node({x=pos.x, y=pos.y+1, z=pos.z});
       -- leftover elevator_top nodes can be removed by placing a new elevator underneath
       if( node ~= nil and node.name ~= "air" and node.name ~= 'travelnet:elevator_top') then
          minetest.chat_send_player( placer:get_player_name(), S('Not enough vertical space to place the travelnet box!'))
          return;
       end
       return minetest.item_place(itemstack, placer, pointed_thing);
    end,

    on_destruct = function(pos)
            local p = {x=pos.x, y=pos.y+1, z=pos.z}
	    minetest.remove_node(p)
    end
})

minetest.register_alias("travelnet:elevator_top", "air")

--if( minetest.get_modpath("technic") ~= nil ) then
--        minetest.register_craft({
--                output = "travelnet:elevator",
--		recipe = {
--                        {"default:steel_ingot", "technic:motor", "default:steel_ingot", },
--                	{"default:steel_ingot", "technic:control_logic_unit", "default:steel_ingot", },
--                	{"default:steel_ingot", "moreores:copper_ingot", "default:steel_ingot", }
--                }
--        })
--else
	minetest.register_craft({
	        output = "travelnet:elevator",
		recipe = travelnet.elevator_recipe,
	})
--end