Módulo:ResolveEntityId

local p = {}

function p._entityid(_,id,alt)

   -- backwards compatibility for deprecated _entityid function
   return p._id(id,alt)

end

function p._id(id,alt)

   if type(id) == 'string' then
       id = mw.ustring.upper(mw.ustring.sub(id,1,1))..mw.ustring.sub(id,2)
       if mw.ustring.match(id,'^Q%d+$') then
           -- id is in the proper format for a Wikidata entity
           if mw.wikibase.isValidEntityId(id) then
               -- id is valid
               id = mw.wikibase.getEntity(id)
               if id then
                   -- entity exists
                   return id.id
               end
           end
       else
           id = mw.wikibase.getEntityIdForTitle(id)
           if id then
               -- id is a title that matches a Wikidata entity
               local instanceOf = mw.wikibase.getBestStatements(id, 'P31')[1] --instance of
               if instanceOf and instanceOf.mainsnak.datavalue.value.id ~= 'Q4167410' then
                   -- not disambiguation
                   return mw.wikibase.getEntity(id).id
               elseif instanceOf == nil then
                   -- id is a title, but is missing an instance-of value
                   return mw.wikibase.getEntity(id).id
               end
           end
       end
   end
   return alt or nil

end

function p.entityid(frame)

   return p._id(frame.args[1], frame.args[2])

end

return p