Module:Authority control

function getCatForId( id )

   local title = mw.title.getCurrentTitle()
   local namespace = title.namespace
   if namespace == 0 then
       return 
   elseif namespace == 2 and not title.isSubpage then
       return 
   else
       return 
   end

end

function viafLink( id )

   if not string.match( id, '^%d+$' ) then
       return false
   end
   return '.. id .. ' ' .. id .. '' .. getCatForId( 'VIAF' )

end

function lccnLink( id )

   local parts = splitLccn( id )
   if not parts then
       return false
   end
   id = parts[1] .. parts[2] .. append( parts[3], '0', 6 )
   return '.. id .. ' ' .. id .. '' .. getCatForId( 'LCCN' )

end

function splitLccn( id )

   if id:match( '^%l%l?%l?%d%d%d%d%d%d%d%d%d?%d?$' ) then
       id = id:gsub( '^(%l+)(%d+)(%d%d%d%d%d%d)$', '%1/%2/%3' )
   end
   if id:match( '^%l%l?%l?/%d%d%d?%d?/%d+$' ) then
        return mw.text.split( id, '/' )
   end
   return false

end

function append(str, c, length)

   while str:len() < length do
       str = c .. str
   end
   return str

end

function isniLink( id )

   id = validateIsni( id )
   if not id then
       return false
   end
   return '.. id .. ' ' .. id:sub( 1, 4 ) .. ' ' .. id:sub( 5, 8 ) .. ' '  .. id:sub( 9, 12 ) .. ' '  .. id:sub( 13, 16 ) .. '' .. getCatForId( 'ISNI' )

end

--Validate ISNI (and ORCID) and retuns it as a 16 characters string or returns false if it's invalid --See http://support.orcid.org/knowledgebase/articles/116780-structure-of-the-orcid-identifier function validateIsni( id )

   id = id:gsub( '[ %-]',  ):upper()
   if not id:match( '^%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d[%dX]$' ) then
       return false
   end
   if getIsniCheckDigit( id ) ~= string.char( id:byte( 16 ) ) then
       return false
   end
   return id

end

--Returns the ISNI check digit isni must be a string where the 15 first elements are digits function getIsniCheckDigit( isni )

   local total = 0
   for i = 1, 15 do
       local digit = isni:byte( i ) - 48 --Get integer value
       total = (total + digit) * 2
   end
   local remainder = total % 11
   local result = (12 - remainder) % 11
   if result == 10 then
       return "X"
   end
   return tostring( result )

end

function orcidLink( id )

   id = validateIsni( id )
   if not id then
       return false
   end
   id = id:sub( 1, 4 ) .. '-' .. id:sub( 5, 8 ) .. '-'  .. id:sub( 9, 12 ) .. '-'  .. id:sub( 13, 16 )
   return '.. id .. ' ' .. id .. '' .. getCatForId( 'ORCID' )

end

function gndLink( id )

   return '.. id .. ' ' .. id .. '' .. getCatForId( 'GND' )

end

function selibrLink( id )

   return '.. id .. ' ' .. id .. '' .. getCatForId( 'SELIBR' )

end

function bnfLink( id )

   --Add cb prefix if it has been removed
   if not string.match( id, '^cb.+$' ) then
       id = 'cb' .. id
   end

   return '.. id .. ' ' .. id .. '' .. getCatForId( 'BNF' )

end

function bpnLink( id )

   if not string.match( id, '^%d+$' ) then
       return false
   end
   return '.. id .. ' ' .. id .. '' .. getCatForId( 'BPN' )

end

function ridLink( id )

   return '.. id .. ' ' .. id .. '' .. getCatForId( 'RID' )

end

function bibsysLink( id )

   return '.. id .. '&feltselect=bs.autid ' .. id .. '' .. getCatForId( 'BIBSYS' )

end

function ulanLink( id )

   return '.. id .. ' ' .. id .. '' .. getCatForId( 'ULAN' )

end

function getIdsFromWikidata( item, property )

   local ids = {}
   if not item.claims[property] then
       return ids
   end
   for _, statement in pairs( item.claims[property] ) do
       table.insert( ids, statement.mainsnak.datavalue.value )
   end
   return ids

end

function createRow( id, label, rawValue, link, withUid )

   if link then
       if withUid then
           return '* ' .. label .. ' ' .. link .. '\n'
       else
           return '* ' .. label .. ' ' .. link .. '\n'
       end
   else
       return '* \n'
   end

end

--In this order: name of the parameter, label, propertyId in Wikidata, formatting function local conf = {

   { 'VIAF', 'VIAF', 214, viafLink },
   { 'LCCN', 'LCCN', 244, lccnLink },
   { 'ISNI', 'ISNI', 213, isniLink },
   { 'ORCID', 'ORCID', 496, orcidLink },
   { 'GND', 'GND', 227, gndLink },
   { 'SELIBR', 'LIBRIS', 0, selibrLink },
   { 'BNF', 'BNF', 268, bnfLink },
   { 'BPN', 'BPN', 651, bpnLink },
   { 'RID', 'ResearcherID', 0, ridLink },
   { 'BIBSYS', 'BIBSYS', 0, bibsysLink },
   { 'ULAN', 'ULAN', 245, ulanLink }

}

local p = {}

function p.authorityControl( frame )

   local parentArgs = frame:getParent().args
   --Create rows
   local elements = {}

   --redirect PND to GND
   if (parentArgs.GND == nil or parentArgs.GND == ) and parentArgs.PND ~= nil and parentArgs.PND ~=  then
       parentArgs.GND = parentArgs.PND
   end

   --Wikidata fallback if requested
   local item = mw.wikibase.getEntity()
   if item ~= nil and item.claims ~= nil then
       for _, params in pairs( conf ) do
           if params[3] ~= 0 then
               local val = parentArgs[params[1]]
               if not val or val ==  then
                   local wikidataIds = getIdsFromWikidata( item, 'p' .. params[3] )
                   if wikidataIds[1] then
                       parentArgs[params[1]] = wikidataIds[1]
                   end
               end
           end
       end
   end

   --Worldcat
   if parentArgs['WORLDCATID'] and parentArgs['WORLDCATID'] ~=  then
       table.insert( elements, createRow( 'WORLDCATID', , parentArgs['WORLDCATID'], '.. parentArgs['WORLDCATID' .. ' WorldCat]', false ) ) --Validation?
   elseif parentArgs['LCCN'] and parentArgs['LCCN'] ~=  then
       local lccnParts = splitLccn( parentArgs['LCCN'] )
       if lccnParts then
           table.insert( elements, createRow( 'LCCN', , parentArgs['LCCN'], '.. lccnParts[1 .. lccnParts[2] .. '-' .. lccnParts[3] .. ' WorldCat]', false ) )
       end
   end

   --Configured rows
   for k, params in pairs( conf ) do
       local val = parentArgs[params[1]]
       if val and val ~=  then
           table.insert( elements, createRow( params[1], params[2] .. ':', val, params[4]( val ), true ) )
       end
   end
   local Navbox = require('Module:Navbox')
   return Navbox._navbox( {
       name  = 'Authority control',
       bodyclass = 'hlist',
       group1 = 'Authority control',
       list1 = table.concat( elements )
   } )

end

return p