require('strict')
local p = {}
local frame = mw.getCurrentFrame()
local config_file = frame.args.config and frame.args.config~='' and ('/' .. frame.args.config) or ''
local config = mw.loadData('Module:Authority control/config' .. config_file)
local title = mw.title.getCurrentTitle()
local namespace = title.namespace
local testcases = title.subpageText == config.i18n.testcases

local wikilink = function(target, label)
	return label and '[[' .. target .. '|' .. label .. ']]' or '[[' .. target .. ']]'
end

local needsAttention = function(sortkey)
	return wikilink(config.i18n.category .. ':' .. config.i18n.attentioncat, sortkey .. title.text)
end

local addCat = function(cat, sortkey)
	if cat and cat~='' and (namespace==0 or namespace==14 or testcases) then
		local redlinkcat = ''
		if testcases==false then
			local success, exists = pcall(function() return mw.title.new(cat, 14).exists end)
			if success and not exists then 
				redlinkcat = needsAttention('N')
			end
		end
		return wikilink(config.i18n.category..':'..cat, sortkey and sortkey..title.text) .. redlinkcat
	else
		return ''
	end
end

local tooltip = function(text, label)
	if label and label~='' then
		return frame:expandTemplate{
			title = 'Tooltip',
			args = {text, label}
		}
	else
		return text
	end
end

local _makelink = function(id, val, additional, qid) --validate values and create a link
	local link = mw.html.create('span'):addClass('uid')
	if not additional and id.prefix then --show prefix on primary value
		link:wikitext(id.prefix .. ': ')
	end
	local valid_value = false
	if id.customlink then -- use function to validate and generate link
		local newlink = require(config.auxiliary)[id.customlink](val.id, additional)
		if newlink then
			link:wikitext(newlink)
			valid_value = true
		end
	else
		if id.pattern then -- check pattern to determine validity
			valid_value = string.match(val.id, '^' .. id.pattern .. '$')
		elseif id.patterns then -- check multiple patterns to determine validity
			for _, pattern in ipairs(id.patterns) do
				valid_value = val.id:match('^' .. pattern .. '$')
				if valid_value then break end
			end
		elseif id.valid then -- use function to determine validity
			valid_value = require(config.auxiliary)[id.valid](val.id)
		else -- no validation possible
			valid_value = val.id
		end
		if valid_value then
			local label = id.label
			if not label or additional then
				label = tostring(additional)
			end
			local newlink
			if id.link then
				valid_value = valid_value:gsub('%%', '%%%%')
				newlink = '[' .. mw.ustring.gsub(id.link, '%$1', valid_value) .. ' ' .. label .. ']'
			else
				newlink = valid_value
			end
			link:wikitext(tooltip(newlink, val.name))
		end
	end
	if valid_value then
		local cat =  id.category and string.format(config.i18n.cat, id.category)
		link:wikitext(addCat(cat))
	else
		local wdlink = qid and wikilink(':wikidata:' .. qid .. '#P' .. id.property) or ''
		local name = mw.wikibase.getLabel('P' .. id.property) or ''
		local tooltip = string.format(
			config.i18n.idnotvalid,
			name,
			val.id
		)
		local cat = id.category and string.format(
			config.i18n.cat,
			config.i18n.faulty .. ' ' .. id.category
		)
		link:wikitext(wikilink('File:' .. config.i18n.warningicon .. '|20px|frameless|link=' .. wdlink, tooltip .. '.'))
			:wikitext(addCat(cat))
			:wikitext(addCat(config.i18n.allfaultycat, name))
	end
	return link
end

local _makelinks = function(id, qid)
--[[==================================]]
--[[            Make links            ]]
--[[==================================]]
local getquals = function(statement, qualid)
	if statement.qualifiers and statement.qualifiers['P'..qualid] then
		return mw.wikibase.renderSnak(statement.qualifiers['P'..qualid][1])
	end
end
local ids = {}
if qid then
	for _, statement in ipairs(mw.wikibase.getBestStatements(qid, 'P'..id.property)) do
		if statement.mainsnak.datavalue then
			local val = statement.mainsnak.datavalue.value
			if val then
				local namedas = getquals(statement, 1810) or getquals(statement, 742) or ''
				table.insert(ids, {id=val, name=namedas})
end end end end
local links
if ids[1] then
	links = mw.html.create('li'):node(_makelink(id, ids[1], false, qid))
	if ids[2] then
		local sublinks = mw.html.create('ul')
		for n = 2, #ids do
			sublinks:tag('li'):node(_makelink(id, ids[n], n, qid)):done()
		end
		links:node(sublinks)
	end
end
return links
end

p.authorityControl = function(frame)
--[[==================================]]
--[[               Main               ]]
--[[==================================]]
local resolveQID = function(qid)
	if qid then
		qid = 'Q' .. mw.ustring.gsub(qid, '^[Qq]', '')
		if mw.wikibase.isValidEntityId(qid) and mw.wikibase.entityExists(qid) then
			local sitelink = mw.wikibase.getSitelink(qid)
			if sitelink then
				return mw.wikibase.getEntityIdForTitle(sitelink) or mw.wikibase.getEntity(qid).id
			end
			return mw.wikibase.getEntity(qid).id
end end end
local conf = config.config
local parentArgs = frame:getParent().args
local auxCats = ''
local rct = false -- boolean to track if there are any links to be returned
local qid, topic
if namespace==0 then
	qid = mw.wikibase.getEntityIdForCurrentPage()
end
if qid then -- article is connected to a Wikidata item
	if parentArgs.qid and resolveQID(parentArgs.qid)~=qid then -- non-matching qid parameter
		auxCats = auxCats .. needsAttention('D')
	end
else -- page is not connected to any Wikidata item
	qid = resolveQID(parentArgs.qid) -- check qid parameter if no wikidata item is connected
	if qid then -- qid parameter is valid, set topic to display
		topic = mw.wikibase.getLabel(qid)
		if topic then
			if mw.ustring.lower(title.subpageText)==mw.ustring.lower(topic) then -- suppress topic display if subpagename equals topic up to case change
				topic = nil
			end
			if topic and mw.wikibase.getSitelink(qid) then -- make wikilink to article
				topic = wikilink(mw.wikibase.getSitelink(qid), topic)
			end
		else
			auxCats = auxCats .. needsAttention('L')
		end
	elseif parentArgs.qid and parentArgs.qid~='' then -- invalid qid has been supplied, add to tracking cat
		auxCats = auxCats .. needsAttention('Q')
	end
end
local qids = {} -- setup any additional QIDs
if parentArgs.additional=='auto' and qid then  -- check P527 for parts to add additional qids
	local checkparts = function(property)
		local parts = mw.wikibase.getBestStatements(qid, property)
		if parts then
			for _, part in ipairs(parts) do
				if part.mainsnak.datavalue and part.mainsnak.datavalue.value.id then
					local resolvedqid = resolveQID(part.mainsnak.datavalue.value.id)
					if resolvedqid then
						table.insert(qids,resolvedqid)
	end end end end end
	for _, part in ipairs(config.auto_additional) do
		checkparts('P' .. part)
	end
elseif parentArgs.additional and parentArgs.additional~='' then
	for _, v in ipairs(mw.text.split(parentArgs.additional, '%s*,%s*')) do
		v = resolveQID(v)
		if v then
			if v==qid then -- duplicate of qid parameter
				auxCats = auxCats .. needsAttention('R')
			end
			table.insert(qids, v)
		else -- invalid QID specified
			auxCats = auxCats .. needsAttention('A')
		end
	end
end
local numsections, sections = 0, {}
for _, _ in ipairs(config.sections) do -- count number of regular sections
	numsections = numsections + 1
end
for _ = 1, #qids+numsections do
	table.insert(sections, {})
end

-- check which identifiers to show/suppress in template
local show, show_all_unsuppressed = {}, true
local stripP = function(pid) --strip P from property number
	if pid:match('^[Pp]%d+$') then
		pid = mw.ustring.gsub(pid, '[Pp]', '')
	end
	if pid:match('^%d+$') then
		return tonumber(pid)
	end
end
local addshowlist = function(list)
	if list and list~='' then
		for _, v in ipairs(mw.text.split(string.lower(list), '%s*,%s*')) do
			local vprop = stripP(v)
			if vprop then -- e.g. show=P214 to show one particular property
				show[vprop] = true
			else -- e.g. show=arts to use whitelist
				if config.whitelists[v] then
					for _, w in ipairs(config.whitelists[v].properties) do
						show[w] = true
		end end end end
		show_all_unsuppressed = false
end end
addshowlist(frame.args.show) -- check show parameter on wrapper template
addshowlist(parentArgs.show) -- check show parameter on article
addshowlist(parentArgs.country) -- check country parameter on article
if parentArgs.suppress then
	local suppresslist = mw.text.split(parentArgs.suppress, '%s*,%s*') -- split parameter by comma
	for _, v in ipairs(suppresslist) do
		v = stripP(v)
		if v then
			show[v] = false
			auxCats = auxCats .. wikilink(config.i18n.category .. ':' .. config.i18n.suppressedcat)
		else
			auxCats = auxCats .. needsAttention('P')
		end
	end
end

local makeSections = function(qid, addit)
	for _, id in ipairs(conf) do
		if id.suppressedbyproperty then
			for _, property in ipairs(id.suppressedbyproperty) do
				if show[property]=='used' then -- property is in use
					show[id.property] = false -- suppressed by another property
		end end end
		if show[id.property]==nil then
			show[id.property] = show_all_unsuppressed
		end
		if show[id.property] then
			local links = _makelinks(id, qid)
			if links then
				table.insert(
					sections[addit or id.section],
					links
				)
				show[id.property] = 'used'
				rct = true
end end end end
local pencil = function(qid)
	if qid then
		return require('Module:EditAtWikidata')._showMessage{
			pid = 'identifiers',
			qid = qid
		}
	else
		return ''
	end
end
makeSections(qid, false)
for c = 1, #qids do
	makeSections(qids[c], numsections+c)
end

--configure Navbox
local outString = ''
if rct then -- there is at least one link to display
	local Navbox = require('Module:Navbox')
	local sect, lastsect = 0, 0
	local navboxArgs = {
		name  = 'Authority control',
		navboxclass = 'authority-control',
		bodyclass = 'hlist',
		state = parentArgs.state or config.i18n.autocollapse,
		navbar = 'off'
	}
	for c = 1, numsections+#qids do
		if #sections[c]>0 then -- section is non-empty
			sect = sect + 1
			lastsect = c
			local sectname
			if c<=numsections then -- regular section
				sectname = config.sections[c].name
			else -- section from additional qid
				local qid = qids[c-numsections]
				local label, sitelink = mw.wikibase.getLabel(qid), mw.wikibase.getSitelink(qid)
				if label then
					if sitelink then
						local target = mw.title.new(sitelink)
						if target==title or (target.isRedirect and target.redirectTarget==title) then -- do not link
							sectname = label
						else -- make wikilink to article
							sectname = wikilink(sitelink, label)
						end
					else
						sectname = label
					end
				else
					auxCats = auxCats .. needsAttention('L')
					sectname = qid
				end
				sectname = sectname .. pencil(qid)
			end
			navboxArgs['group' .. c] = sectname
			local list = mw.html.create('ul')
			for _, link in ipairs(sections[c]) do
				list:node(link)
			end
			navboxArgs['list' .. c] = tostring(list)
		end
	end
	if topic then -- display in expanded form with topic
		navboxArgs.title = config.i18n.aclink .. ' &ndash; ' .. topic .. pencil(qid)
	elseif sect==1 then -- special display when only one section
		if lastsect<=numsections then
			if config.sections[lastsect].hidelabelwhenalone then -- no special label when only general or other IDs are present
				navboxArgs['group' .. lastsect] = config.i18n.aclink .. pencil(qid)
			else -- other regular section
				navboxArgs['group' .. lastsect] = config.i18n.aclink .. ': ' .. navboxArgs['group' .. lastsect] .. pencil(qid)
			end
		else -- section from additional qid
			navboxArgs['group' .. lastsect] = config.i18n.aclink .. ': ' .. navboxArgs['group' .. lastsect]
		end
	else -- add title to navbox
		navboxArgs.title = config.i18n.aclink .. pencil(qid)
	end
	outString = Navbox._navbox(navboxArgs)
end

if parentArgs.state
	and parentArgs.state~=''
	and parentArgs.state~=config.i18n.collapsed
	and parentArgs.state~=config.i18n.expanded
	and parentArgs.state~=config.i18n.autocollapse then --invalid state parameter
	auxCats = auxCats .. needsAttention('S')
end
if testcases then
	auxCats = mw.ustring.gsub(auxCats, '(%[%[)(' .. config.i18n.category .. ')', '%1:%2') --for easier checking
end

--out
outString = outString .. auxCats
if namespace~=0 then
	outString = mw.ustring.gsub(outString, '(%[%[)(' .. config.i18n.category .. ':' .. config.i18n.Articles .. ')([^%|%]]+)%|?[^%|%]]*(%]%])','%1:%2%3%4')
	outString = mw.ustring.gsub(outString, '(%[%[)(' .. config.i18n.category .. ':' .. config.i18n.All_articles .. ')([^%|%]]+)%|?[^%|%]]*(%]%])','%1:%2%3%4')
end
local check = require('Module:Check for unknown parameters')._check
local sortkey
if namespace==0 then
	sortkey = '*' .. title.text
else
	sortkey = title.fullText
end
outString = outString .. check({
	['unknown'] = wikilink(config.i18n.category .. ':' .. config.i18n.pageswithparams, sortkey),
	['preview'] = config.i18n.previewwarning, 'show', 'country', 'suppress', 'additional', 'qid', 'state'
	}, parentArgs)
return outString
end

p.makelink = function(id, qid)
	return _makelinks(id, qid)
end

return p