local p = {}

local horizontal = require('Module:List').horizontal



local function makeWikitextError(msg)

	return string.format('<strong class="error">Error: %s</strong>', msg)

end



local function makeFullUrl(page, query, display)

	local url = mw.uri.fullUrl(page, query)

	if not url then

		url = makeWikitextError(string.format(

			'"%s" is not a valid page name',

			tostring(page)

		))

	end

	return string.format(

		'[%s %s]',

		tostring(url),

		display

	)

end



local function make_nomination_link(nominationPage)

	local currentPage = mw.title.getCurrentTitle().prefixedText

	local dykSubpage = 'Template:Did you know nominations/' .. nominationPage

	if currentPage == dykSubpage then

		return string.format(

			'[[Template talk:Did you know#%s|Back to T:TDYK]]',

			nominationPage

		)

	else

		return makeFullUrl(

			dykSubpage,

			{action = 'edit'},

			'Comment'

		) .. string.format(" or [[%s|view]]",dykSubpage)

	end

end



function p._main(nominationPage, historyPages)

	-- Deal with bad input.

	if not nominationPage then

		return makeWikitextError('no nomination page specified')

	end

	if not historyPages or not historyPages1 then

		return makeWikitextError('no articles specified')

	end



	-- Find out whether we are dealing with multiple history pages.

	local isMulti = #historyPages > 1



	local nominationLink = make_nomination_link(nominationPage)



	if isMulti then

		local list_args = {

			class = 'inline',

		}

		for _, page in ipairs(historyPages) do

			table.insert(list_args, makeFullUrl(

				page,

				{action = 'history'},

				page

			))

		end

		

		local multi_root = mw.html.create('div')

		multi_root:addClass('dyk-nompage-links plainlinks')

			:wikitext(string.format('( %s )', nominationLink))

			

		local list_root = mw.html.create('div')

		list_root:wikitext(string.format(

			'( Article history links: %s )',

			horizontal(list_args)

		))

		return tostring(multi_root:node(list_root))

	else

		local historyLink = makeFullUrl(

			historyPages1],

			{action = 'history'},

			'Article history'

		)

		local single_root = mw.html.create('div')

		single_root:addClass('dyk-nompage-links plainlinks')

			:wikitext(string.format(

				'( %s )',

				horizontal({

					class = 'inline',

					nominationLink,

					historyLink

				})

			))

		return tostring(single_root)

	end

end



function p.main(frame)

	local args = require('Module:Arguments').getArgs(frame, {

		wrappers = 'Template:DYK nompage links'

	})

	local nominationPage = args.nompage

	local historyPages = require('Module:TableTools').compressSparseArray(args)

	return p._main(nominationPage, historyPages)

end



return p