local export = {}
local pos_functions = {}
local links = require('Module:links')
local labels = require('Module:labels')

local lang = require('Module:languages').getByCode('pi')
local PAGENAME = mw.title.getCurrentTitle().text
local currentScript = require('Module:scripts').findBestScript(PAGENAME, lang)

local translit = require('Module:pi-Latn-translit').tr

local Array = require "Module:array"

function export.alt(frame)

	local args = frame:getParent().args

	local currentScriptCode = currentScript:getCode()
	local availableScripts = lang:getScripts()
	local latinForm = args['Latn'] or currentScriptCode == 'Latn' and PAGENAME or error('No Latin-script form detected.')
	local scriptCode

	local terms
	local first
	local output = Array('<div class="NavFrame" style="max-width:40em"><div class="NavHead" style="background:#d9ebff">Alternative forms</div><div class="NavContent" style="text-align:left"><ul>')
	for _, script in ipairs(availableScripts) do
		scriptCode = script:getCode()
		terms = { args[scriptCode], args[scriptCode..'2'], args[scriptCode..'3'], args[scriptCode..'4'] }

		output:insert('<li>')

		local t1, t2, t3
		t1 = translit(latinForm, scriptCode) -- not affect Latn itself
		if scriptCode == 'Thai' or scriptCode == 'Laoo' then
			t2 = translit(latinForm, scriptCode, {impl='no'})
		end
-- For Lao script without implicit vowels, 'y' can also be 'ຢ', but seemingly
-- not if a Buddhist Institute consonant is used.
		if scriptCode == 'Laoo' then
			if not mw.ustring.find(t2, '[ຆຌຏຐຑຒຓຘຠຨຩ]') then
				t3 = mw.ustring.gsub(t2, 'ຍ', 'ຢ')
			end
		end
		if #terms == 0 then
			terms[1] = t1
			if t2 and t1 ~= t2 then terms[2] = t2 end
			if t3 and (t2 ~= t3) then table.insert(terms, t3) end
		elseif terms[1] ~= t1 then
			output:insert('[[Category:Pali terms with inconsistent transliterations]]')
		end

		first = true
		for _,term in ipairs(terms) do
			if term ~= nil and term ~= PAGENAME then
				if first then
					output:insert(links.full_link({lang = lang, sc = script, term = term}))
					first = false
				else
					output:insert(' or ' .. links.full_link({lang = lang, sc = script, term = term}))
				end
			end
		end
		if scriptCode ~= currentScriptCode or #terms > 1 then
			output:insert(' ' .. labels.show_labels({ script:getCategoryName() }, lang) .. '</li>')
		end
	
	end
	output:insert('</ul></div></div>')

	return output:concat()

end

function export.show(frame)
	local args = require('Module:parameters').process(frame:getParent().args,{
		[1] = {default = '?'},
		["g2"] = {},
		['head'] = {},
	})
	local poscat = frame.args[1] or error('Part of speech has not been specified. Please pass parameter 1 to the module invocation.')
	
	local data = {lang = lang, sc = currentScript, pos_category = poscat, categories = {'Pali ' .. poscat .. ' in ' .. currentScript:getCategoryName()}, heads = {args['head'] or PAGENAME}, genders = {}, inflections = {}}
	
	if poscat == 'nouns' or poscat == 'proper nouns' or poscat == 'pronouns' then
		table.insert(data.genders, args[1])
		table.insert(data.genders, args["g2"])
	end
	
    if poscat == 'verbs' then
        table.insert(data.inflections, {label = 'root', args[1]})
    end
	
	return require('Module:headword').full_headword(data)
end

return export