-- LUA Script - precede every function and global member with lowercase name of script + '_main'
local dynEnts = {}

function bookcase_items_init_name( e, name )	
	dynEnts[ e ] = { entD = e, entB = nil, name = name, used = false, showing = false, list = nil }
end

-- creates list entry by calculating offsets between entities
local function build_list( be, de )
	local bx, by, bz = GetEntityPosAng( be )
	local dx, dy, dz = GetEntityPosAng( de )
	
	return { xo = dx - bx, yo = dy - by, zo = dz - bz }
end

function BC_Register( entity, name )
	for k, v in pairs( dynEnts ) do
		if v.name == name and not v.used then
			dynEnts[ k ].used = true
			dynEnts[ k ].entB = entity
			dynEnts[ k ].list = build_list( entity, k )
		end
	end
end

local function repositionDE( de, nx, ny, nz )
	local dl = de.list

	ResetPosition( de.entD, nx + dl.xo, ny + dl.yo, nz + dl.zo )
end

function BC_Update( entity, x, y, z )
	for k, v in pairs( dynEnts ) do
		if v.used and v.entB == entity then
			repositionDE( v, x, y, z )
		end
	end
end

function bookcase_items_main( e )
end