require('strict')

local function getCatForId( id )
	local title = mw.title.getCurrentTitle()
	local namespace = title.namespace
	if namespace == 0 then
		return '[[Category:Περιεχόμενο Βικιθήκης με αναγνωριστικά ' .. id .. ']]'
	elseif namespace == 2 and not title.isSubpage then
		return '[[Category:Σελίδες χρηστών με αναγνωριστικά ' .. id .. ']]'
	else
		return '[[Category:Διάφορες σελίδες με αναγνωριστικά ' .. id .. ']]'
	end
end

local function viafLink( id )
	if not string.match( id, '^%d+$' ) then
		return false
	end
	return '[https://viaf.org/viaf/' .. id .. ' ' .. id .. ']' .. getCatForId( 'VIAF' )
end

local function NLGIDLink( id )
	return '[https://catalogue.nlg.gr/Authority/Record?id=au.' .. id .. ' ' .. id .. ']' .. getCatForId( 'EBE' )
end

local function BNeditionLink( id )
	return '[http://www.biblionet.gr/book/' .. id .. ' ' .. id .. ']' .. getCatForId( 'BiblioNet' )
end

local function BNpersonLink( id )
	return '[http://www.biblionet.gr/προσωπο/?personid=' .. id .. ' ' .. id .. ']' .. getCatForId( 'BiblioNet' )
end

local function BNpublisherLink( id )
	return '[http://www.biblionet.gr/com/' .. id .. ' ' .. id .. ']'.. getCatForId( 'BiblioNet' )
end

local function kulturnavLink( id )
	return '[http://kulturnav.org/language/en/' .. id .. ' id]' 
end

local function sikartLink( id )
	return '[http://www.sikart.ch/KuenstlerInnen.aspx?id=' .. id .. '&lng=en ' .. id .. ']' 
end

local function tlsLink( id )
	local id2 = mw.ustring.gsub(id, '%s', function(s) return mw.uri.encode(s, 'WIKI') end)
	return '[http://tls.theaterwissenschaft.ch/wiki/' .. id2 .. ' ' .. id .. ']' 
end


local function ciniiLink( id )
	return '[http://ci.nii.ac.jp/author/' .. id .. '?l=en ' .. id .. ']' 
end

local function bneLink( id )
	return '[http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?action=display&authority_id=' .. id .. ' ' .. id .. ']' 
end


local function uscongressLink( id )
	return '[http://bioguide.congress.gov/scripts/biodisplay.pl?index=' .. id .. ' ' .. id .. ']' 
end

local function narapersonLink( id )
	return '[http://research.archives.gov/person/' .. id .. ' ' .. id .. ']' 
end

local function naraorganizationLink( id )
	return '[http://research.archives.gov/organization/' .. id .. ' ' .. id .. ']' 
end

local function gutenbergauthorLink( id )
	local id2 = mw.ustring.gsub(id, '%s', function(s) return mw.uri.encode(s, 'PATH') end)
	return '[http://www.gutenberg.org/ebooks/author/' .. id .. ' ' .. id .. ']' 
end

local function mgpLink( id )
	-- TODO Implement some sanity checking regex
	return '[http://www.genealogy.ams.org/id.php?id=' .. id .. ' ' .. id .. ']' 
end

local function rslLink( id )
	-- TODO Implement some sanity checking regex
	return '[http://aleph.rsl.ru/F?func=find-b&find_code=SYS&adjacent=Y&local_base=RSL11&request=' .. id .. '&CON_LNG=ENG ' .. id .. ']'
end

local function leonoreLink( id )
	return '[https://www.leonore.archives-nationales.culture.gouv.fr/ui/notice/' .. id .. ' ' .. id .. ']' 
end

local function sbnLink( id )
	return '[https://opac.sbn.it/opacsbn/opac/iccu/scheda_authority.jsp?bid=' .. id .. ' ' .. id .. ']'
end

local function nkcLink( id )
	return '[http://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=' .. id .. '&CON_LNG=ENG ' .. id .. ']' 
end

local function nclLink( id )
	if not string.match( id, '^%d+$' ) then
		return false
	end
	return '[http://aleweb.ncl.edu.tw/F/?func=accref&acc_sequence=' .. id .. '&CON_LNG=ENG ' .. id .. ']' 
end

local function ndlLink( id )
	return '[http://id.ndl.go.jp/auth/ndlna/' .. id .. ' ' .. id .. ']' 
end

local function sudocLink( id )
	if not string.match( id, '^%d%d%d%d%d%d%d%d[%dxX]$' ) then
		return false
	end
	return '[http://www.idref.fr/' .. id .. ' ' .. id .. ']' 
end

local function hlsLink( id )
	if not string.match( id, '^%d+$' ) then
		return false
	end
	return '[http://www.hls-dhs-dss.ch/textes/f/F' .. id .. '.php ' .. id .. ']'
end

local function lirLink( id )
	if not string.match( id, '^%d+$' ) then
		return false
	end
	return '[http://www.e-lir.ch/e-LIR___Lexicon.' .. id .. '.450.0.html ' .. id .. ']'
end

local 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

local function append(str, c, length)
	while str:len() < length do
		str = c .. str
	end
	return str
end

local function lccnLink( id )
	local parts = splitLccn( id )
	if not parts then
		return false
	end
	local lccnType = parts[1] ~= 'sh' and 'names' or 'subjects'
	id = parts[1] .. parts[2] .. append( parts[3], '0', 6 )
	return '[http://id.loc.gov/authorities/' .. lccnType .. '/' .. id .. ' ' .. id .. ']' .. getCatForId( 'LCCN' )
end

local function mbLink( id )
	-- TODO Implement some sanity checking regex
	return '[//musicbrainz.org/artist/' .. id .. ' ' .. id .. ']' .. getCatForId( 'MusicBrainz' )
end

--Returns the ISNI check digit isni must be a string where the 15 first elements are digits
local 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

--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
local 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

local function isniLink( id )
	id = validateIsni( id )
	if not id then
		return false
	end
	return '[http://isni.org/' .. id .. ' ' .. id:sub( 1, 4 ) .. ' ' .. id:sub( 5, 8 ) .. ' '  .. id:sub( 9, 12 ) .. ' '  .. id:sub( 13, 16 ) .. ']' .. getCatForId( 'ISNI' )
end

local 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 '[http://orcid.org/' .. id .. ' ' .. id .. ']' .. getCatForId( 'ORCID' )
end

local function gndLink( id )
	return '[http://d-nb.info/gnd/' .. id .. ' ' .. id .. ']' .. getCatForId( 'GND' )
end

local function selibrLink( id )
	if not string.match( id, '^%d+$' ) then
		return false
	end
	return '[//libris.kb.se/auth/' .. id .. ' ' .. id .. ']' .. getCatForId( 'SELIBR' )
end

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

	return '[http://catalogue.bnf.fr/ark:/12148/' .. id .. ' ' .. id .. '] [http://data.bnf.fr/ark:/12148/' .. id .. ' (data)]' .. getCatForId( 'BNF' )
end

local function bpnLink( id )
	if not string.match( id, '^%d+$' ) then
		return false
	end
	return '[http://www.biografischportaal.nl/en/persoon/' .. id .. ' ' .. id .. ']' .. getCatForId( 'BPN' )
end

local function ridLink( id )
	return '[http://www.researcherid.com/rid/' .. id .. ' ' .. id .. ']' .. getCatForId( 'RID' )
end

local function bibsysLink( id )
	return '[http://ask.bibsys.no/ask/action/result?cmd=&kilde=biblio&cql=bs.autid+%3D+' .. id .. '&feltselect=bs.autid ' .. id .. ']' .. getCatForId( 'BIBSYS' )
end

local function ulanLink( id )
	return '[//www.getty.edu/vow/ULANFullDisplay?find=&role=&nation=&subjectid=' .. id .. ' ' .. id .. ']' .. getCatForId( 'ULAN' )
end

local function nlaLink( id )
	return '[//nla.gov.au/anbd.aut-an' .. id .. ' ' .. id .. ']' .. getCatForId( 'NLA' )
end

local function rkdartistsLink( id )
	return '[https://rkd.nl/en/explore/artists/' .. id .. ' ' .. id .. ']' .. getCatForId( 'RKDartists' )
end

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

local function matchesWikidataRequirements( item, reqs )
	for _, group in pairs( reqs ) do
		local property = 'p' .. group[1]
		local qid = group[2]
		if item.claims[property] ~= nil then
			for _, statement in pairs ( item.claims[property] ) do
				if statement.mainsnak.datavalue ~= nil then
					if statement.mainsnak.datavalue.value['numeric-id'] == qid then
						return true
					end
				end
			end
		end
	end
	return false
end

local function createRow( id, label, rawValue, link, withUid )
	if link then
		if withUid then
			return '* ' .. label .. '&#160;<span class="uid plainlinks">' .. link .. '</span>\n'
		else
			return '* ' .. label .. '&#160;<span class="plainlinks">' .. link .. '</span>\n'
		end
		else
		return '* <span class="error">The ' .. id .. ' id ' .. rawValue .. ' is not valid.</span>[[Category:Σελίδες Βικιθήκης με εσφαλμένο αναγνωριστικό καταλόγου καθιερωμένων όρων]]\n'
	end
end

--In this order: name of the parameter, label, propertyId in Wikidata, formatting function
local conf = {
	{ 'VIAF', '[[w:Virtual International Authority File|VIAF]]', 214, viafLink },
	{ 'NLG', '[[w:Εθνική Βιβλιοθήκη της Ελλάδος|ΕΒΕ]]', 3348, NLGIDLink },
	{ 'BNed', '[[w:BiblioNet|BiblioNet]]', 2187, BNeditionLink },
	{ 'BNper', '[[w:BiblioNet|BiblioNet]]', 2188, BNpersonLink },
	{ 'BNpub', '[[w:BiblioNet|BiblioNet]]', 2189, BNpublisherLink },
	{ 'LCCN', '[[w:Αριθμός Ελέγχου της Βιβλιοθήκης του Κογκρέσου|LCCN]]', 244, lccnLink },
	{ 'ISNI', '[[w:International Standard Name Identifier|ISNI]]', 213, isniLink },
	{ 'ORCID', '[[w:en:ORCID|ORCID]]', 496, orcidLink },
	{ 'GND', '[[w:Gemeinsame Normdatei|GND]]', 227, gndLink },
	{ 'SELIBR', '[[w:LIBRIS|SELIBR]]', 906, selibrLink },
	{ 'SUDOC', '[[w:Système universitaire de documentation|SUDOC]]', 269, sudocLink },    
	{ 'BNF', '[[w:Εθνική Βιβλιοθήκη της Γαλλίας|BNF]]', 268, bnfLink },
	{ 'BPN', '[[w:el:Biografisch Portaal|BPN]]', 651, bpnLink },
	{ 'RID', '[[w:en:ResearcherID]]', 1053, ridLink },
	{ 'BIBSYS', '[[w:BIBSYS|BIBSYS]]', 1015, bibsysLink },
	{ 'ULAN', '[[w:Union List of Artist Names|ULAN]]', 245, ulanLink },
	{ 'HDS', '[[w:Ιστορικό λεξικό της Ελβετίας|HDS]]', 902, hlsLink },
	{ 'LIR', '[[w:en:Historical Dictionary of Switzerland#Lexicon_Istoric_Retic|LIR]]', 886, lirLink },
	{ 'MBA', '[[w:MusicBrainz|MusicBrainz]]', 434, mbLink },
	{ 'MGP', '[[w:Mathematics Genealogy Project|MGP]]', 549, mgpLink },    
	{ 'NLA', '[[w:Εθνική Βιβλιοθήκη της Αυστραλίας|NLA]]', 409, nlaLink },
	{ 'NDL', '[[w:en:National Diet Library|NDL]]', 349, ndlLink },
	{ 'NCL', '[[w:en:National Central Library|NCL]]', 1048, nclLink },
	{ 'NKC', '[[w:Εθνική βιβλιοθήκη της Τσεχίας|NKC]]', 691, nkcLink },
	{ 'Léonore', '[[w:fr:Base Léonore|Léonore]]', 11152, leonoreLink }, 
	{ 'SBN', '[[w:Istituto Centrale per il Catalogo Unico|ICCU]]', 396, sbnLink },     
	{ 'RLS', '[[w:ru:Российская_государственная_библиотека|RLS]]', 947, rslLink },
	{ 'Gutenberg', '[[w:Project Gutenberg|Project Gutenberg]]', 1938, gutenbergauthorLink },
	{ 'NARA-person', '[[w:en:National Archives and Records Administration|NARA]]', 1222, narapersonLink },
	{ 'NARA-organization', '[[w:en:National Archives and Records Administration|NARA]]', 1223, naraorganizationLink },
	{ 'USCongress', '[[w:en:Biographical Directory of the United States Congress|US Congress]]', 1157, uscongressLink },
	{ 'BNE', '[[w:Εθνική Βιβλιοθήκη της Ισπανίας|BNE]]', 950, bneLink },
	{ 'CINII', '[[w:CiNii]]', 271, ciniiLink },
	{ 'TLS', '[[w:de:Theaterlexikon der Schweiz|TLS]]', 1362, tlsLink },
	{ 'SIKART', '[[w:de:SIKART]]', 781, sikartLink },
	{ 'KULTURNAV', '[[w:KulturNav]]', 1248, kulturnavLink },
	{ 'RKDartists', '[[w:Ολλανδικό Ίδρυμα Ιστορίας της Τέχνης|RKD]]', 650, rkdartistsLink },
}

-- Check that the Wikidata item has this property-->value before adding it
local reqs = {}

local p = {}

function p.authorityControl( frame )
	local parentArgs = {}
	--Create rows
	local elements = {}

	--Wikidata fallback if requested
	local item = mw.wikibase.getEntityObject()
	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 canUseWikidata = nil
					if reqs[params[1]] ~= nil then
						canUseWikidata = matchesWikidataRequirements( item, reqs[params[1]] )
					else
						canUseWikidata = true
					end
					if canUseWikidata then
						local wikidataIds = getIdsFromWikidata( item, 'P' .. params[3] )
						if wikidataIds[1] then
							parentArgs[params[1]] = wikidataIds[1]
						end
					end
				end
			end
		end
	end

	--Worldcat
	if parentArgs['WORLDCATID'] and parentArgs['WORLDCATID'] ~= '' then
		table.insert( elements, createRow( 'WORLDCATID', '', parentArgs['WORLDCATID'], '[//www.worldcat.org/identities/' .. 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'], '[//www.worldcat.org/identities/lccn-' .. lccnParts[1] .. lccnParts[2] .. '-' .. lccnParts[3] .. ' WorldCat]', false ) )
		end
	end

	--Configured rows
	local rct = 0
	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 ) )
			rct = rct + 1
		end
	end
	local Navbox = require('Module:Navbox')
	local elementscats = ''
	if rct > 13 then
		elementscats  = '[[Category:AC με ' .. rct .. ' στοιχεία]]'
	end
	
	if #elements ~= 0 then
		return Navbox._navbox( {
			name  = 'Authority control',
			bodystyle = 'margin-top:3em',
			bodyclass = 'hlist',
			group1 = 'Σύνδεσμοι σε [[w:Κατάλογος καθιερωμένων όρων|καταλόγους καθιερωμένων όρων]]' .. elementscats,
			list1 = table.concat( elements )
			} )
	else
		return ""
	end
end

return p