Module:Period

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local p = {}

function p._periodSpan(item, lang)
	-- get the time span of the period given by "item"from the Wikidata values
	-- for P580/P582 or P571/P576
	local getDate = require('Module:Wikidata date')._date
	local start = getDate(item, 'P580' , lang).str or getDate(item, 'P571' , lang).str
	local stop = getDate(item, 'P582' , lang).str or getDate(item, 'P576' , lang).str 
	-- TODO: [[Module:Wikidata label]] has issues with RTL text when falling back
	-- to some LTR text, see the example at [[Template:Period/testcases]],
	-- has to get fixed there probably
	local spantext = nil
	if start or stop then
		spantext = string.format('(%s–%s)', start or '', stop or '')
	end
	return spantext
end

function p._period(period, dates, lang)
	local wikitext = ''
	local LookupTable = mw.loadData('Module:Period/data')
	local item = LookupTable[string.lower(period)]
	-- try to find an item in the dictionary
	if item then
	-- if an item was found use it
		local wikidata_label = require('Module:Wikidata label')._getLabel
		wikitext = wikidata_label(item, lang)
		-- now get the time span if requested and append it to the wikitext string
		if dates == 'date' or dates == 'yes' then
			local spantext = p._periodSpan(item, lang)
			if spantext then
				wikitext = wikitext .. ' ' .. spantext
			end
		elseif dates and dates ~= '' then
			wikitext = string.format('%s (%s)', wikitext, dates)
		end
		-- create and append non-visible language independent marking
		-- in QuickStatements-like format
		-- using property "time period" (P2348)
		local qsText = '<div style="display: none;">era QS:P2348,' .. item .. '</div>'
		wikitext = wikitext .. qsText

	elseif period and period ~= '' then
		wikitext = '[[Category:Unsupported period|' .. period .. ']]' .. period
		if dates and dates ~= '' then
			wikitext = string.format('%s (%s)', wikitext, dates)
		end
	end
	return wikitext
end

function p.period(frame)
	local args = frame.args
	return p._period(args.period, args.dates, args.lang)
end

return p