local process_params = require("Module:parameters").process

local export = {}

local function get_args(frame)
	local boolean = {type = "boolean"}
	local boolean_list_allow_holes = {type = "boolean", list = true, allow_holes = true}
	local list_allow_holes = {list = true, allow_holes = true}
	local plain = {}
	return process_params(frame:getParent().args, {
		 = {required = true, type = "language", etym_lang = true, default = "und"},
		 = {type = "script"},
		 = plain,

		 = {required = true, default = "nouns"},
		 = boolean,
		 = boolean,
		 = boolean,
		 = boolean,
		 = boolean,
		 = boolean,
		 = boolean,
		 = plain,
		 = plain,
		 = plain,
		
		 = list_allow_holes,
		 = plain,
		 = list_allow_holes,
		 = list_allow_holes,
		 = plain,
		 = {list = true},
		 = list_allow_holes,
		
		 = list_allow_holes,
		
		 = list_allow_holes,
		 = list_allow_holes,
		 = list_allow_holes,
		 = list_allow_holes,
		 = list_allow_holes,
		 = boolean_list_allow_holes,
		 = list_allow_holes,
		 = list_allow_holes,
		 = {list = true, allow_holes = true, type = "language", etym_lang = true},
		 = {list = true, allow_holes = true, type = "script"},
		 = list_allow_holes,
		 = list_allow_holes,
		 = list_allow_holes,
		 = list_allow_holes,
		 = list_allow_holes,
		 = boolean_list_allow_holes,
		 = boolean_list_allow_holes,
	})
end

function export.head_t(frame)
	local function track(page)
		require("Module:debug/track")("headword/templates/" .. page)
		return true
	end

	local args = get_args(frame)
	
	-- Get language and script information
	local data = {}
	data.lang = args
	data.sc = args
	data.sccat = args
	data.sort_key = args
	data.heads = args
	data.id = args
	data.translits = args
	data.transcriptions = args
	data.gloss = args
	data.genders = args
	-- This shouldn't really happen.
	for i = 1,args.maxindex do
		if not args then
			track("head-with-holes")
		end
	end
	for k, v in pairs(args) do
		if k ~= "maxindex" then
			if data.genders then
				data.genders = {spec = data.genders, qualifiers = {v}}
			else
				k = k == 1 and "" or tostring(k)
				error(("g%squal= specified without g%s="):format(k, k))
			end
		end
	end

	-- Part-of-speech category
	data.pos_category = args
	data.noposcat = args

	local headword_data = mw.loadData("Module:headword/data")

	-- Check for headword aliases and then pluralize if the POS term does not have an invariable plural.
	data.pos_category = headword_data.pos_aliases or data.pos_category
	if not data.pos_category:find("s$") and not headword_data.invariable then
		-- Make the plural form of the part of speech
		data.pos_category = data.pos_category:gsub("x$", "%0e") .. "s"
	end

	-- Additional categories.
	data.categories = {}
	data.whole_page_categories = {}
	data.nomultiwordcat = args
	data.nogendercat = args
	data.nopalindromecat = args

	if args then
		table.insert(data.categories, data.lang:getFullName() .. " " .. args)
	end

	if args then
		table.insert(data.categories, data.lang:getFullName() .. " " .. args)
	end

	if args then
		table.insert(data.categories, data.lang:getFullName() .. " " .. args)
	end

	-- Headword linking
	data.nolinkhead = args

	-- Inflected forms
	data.inflections = {enable_auto_translit = args}

	for i = 1, math.ceil(args.maxindex / 2) do
		local infl_part = {
			label    = args,
			accel    = args and {
				form      = args,
				translit  = args,
				lemma     = args,
				lemma_translit = args,
				gender    = args,
				nostore   = args,
			} or nil,
			request  = args,
			enable_auto_translit = args,
		}
		
		local form = {
			term          =  args,
			alt           =  args,
			genders       =  args and mw.text.split(args, ",") or {},
			id            =  args,
			lang          =  args,
			nolinkinfl    =  args,
			q             = {args},
			sc            =  args,
			translit      =  args,
			transcription =  args,
		}
		
		-- If no term or alt is given, then the label is shown alone.
		if form.term or form.alt then
			table.insert(infl_part, form)
		end
		
		if infl_part.label == "or" then
			-- Append to the previous inflection part, if one exists
			if #infl_part > 0 and data.inflections then
				table.insert(data.inflections, form)
			end
		elseif infl_part.label then
			-- Add a new inflection part
			table.insert(data.inflections, infl_part)
		end
	end
	
	return require("Module:headword").full_headword(data)
end

return export