local data = mw.loadData( 'Module:Ancient Olympiads/data' )

local lang = mw.language.getContentLanguage()

local TableTools = require('Module:TableTools')



local p = {}



function p._main( inputYear )

	-- Convert the input to an integer if possible. Return "N/A" if the input could

	-- not be converted, or if the converted input is too big or too small.

	inputYear = tonumber( inputYear )

	if not inputYear or inputYear > tonumber( lang:formatDate( 'Y' ) ) then

		return "''N/A''"

	end

	local dataLength = TableTools.length(data)



	-- Find the year in the data page and display the output.

	for i = dataLength, 1, -1 do

		local t = datai

		if inputYear - 1 == t.year then

			-- year of the Olympiad, test with = p._main( -495 )

			-- The input year in the calendar is one after the expected (-775 for the year 776 BC). This is why all values need to be corrected by 1. 

			-- Year of Olympiad creates autolink to same page, therefore eliminated here

			return string.format(

				'%s [[Olympiad]] ([[%s|victor]][[Winner of the Stadion race|)¹]]',

				t.numberOl, t.winner

			)

		end

        if inputYear > t.year then

			-- Years 2-4 of the Olympiad, test with = p._main( -494 )  etc.

			-- It would be nice, if the string could be as follows:

			-- '[[%s]] [[Olympiad]], [[%d BC|year %d]]',

			-- t.numberOl, inputYear * - 1 + 1, inputYear - t.year

			-- but unfortunately it links to the very same page and won't be displayed as a link but in bold.

			return string.format(

				'[[%s|%s]] [[Olympiad]], year %d',

				t.yearBC, t.numberOl, inputYear - t.year 

			)

		end

	end



	-- If input year is before 776 BC (-775), the year of the first Olympiad.

	return string.format(

		'%d before [[776 BC|1st]] [[Olympiad]]',

		inputYear * -1 - 775

	)

end



function p.main( frame )

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

		parentOnly = true

	} )

	return p._main( args 1  )

end



return p