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local export = {}

local m_table = require('Module:table')
local m_utils = require('Module:grc-utilities')
local m_data = require('Module:grc-utilities/data')
local tag = m_utils.tag
local link = m_utils.link
local tokenize = m_utils.tokenize
local diacritic = m_data.diacritic

local U = mw.ustring.char
local toNFD = mw.ustring.toNFD
local gsub = mw.ustring.gsub

local dottedCircle = U(0x25CC)

export.addDottedCircle = require("Module:Unicode data").add_dotted_circle

function export.printTokens(frame)
	text = frame.args[1]
	local token_format = '<span class="Polyt" style="background-color: #E9E9E9;>%s</span>'
	local spacing = {
		["\n"] = "&para;",
		["\r"] = "&para;",
		[" "] = "&ensp;",
	}
	
	if text then
		local tokens = m_table.shallowcopy(tokenize(text))
		for i, token in pairs(tokens) do
			tokens[i] = token_format:format(string.gsub(token, "%s", spacing))
		end
		return "|-\n| " .. tag(text) .. " || " .. tag(table.concat(tokens, ", "))
	else
		error("Provide text to tokenize in first parameter.")
	end
end

function export.printDiacritics(frame)
	local functionToPrint = frame.args[1] or error('Specify a function in the first parameter.')
	local term = frame.args[2] or error('Add text in the second parameter.')
	
	local result = m_utils[functionToPrint](term)
	
	-- Show diacritics above or below a dotted circle.
	content = {
		term = tag(term),
		term_decomposition = tag(export.addDottedCircle(toNFD(term))),
		result = tag(result),
		result_decomposition = tag(export.addDottedCircle(result)),
	}
	
	local output = [[ term (term_decomposition) → result (result_decomposition)]]
	
	local function addContent(item)
		return content[item] or ""
	end
	
	return (output:gsub("[%a_]+", addContent))
end

function export.decompose(frame)
	local params = {
		[1] = {},
		["link"] = { type = "boolean" },
	}
	
	args = require("Module:parameters").process(frame.args, params)
	
	local text = args[1]
	text = toNFD(text)
	local link = args.link
	local composed
	
	if link then
		composed = link(text, nil, nil, "-")
	else
		composed = tag(text)
	end
	
	local decomposed = export.addDottedCircle(text)
	
	if link then
		local result = {}
		for seat, letter in gmatch(decomposed, "(" .. dottedCircle .. "?)(.)") do
			local link
			if letter then
				link = linkNoTag(letter, seat .. letter)
			end
			
			table.insert(result, link)
		end
		decomposed = table.concat(result)
	end
	
	decomposed = tag(decomposed)
	
	return composed .. " (" .. decomposed .. ")"
end

function export.tokenize(frame)
	local map = require("Module:fun").map
	local token_format = '<span class="Polyt" style="background-color: #EFEFEF;>%s</span>'
	local spacing = {
		["\n"] = "&para;",
		["\r"] = "&para;",
		[" "] = "&ensp;",
	}
	local _tokenize = tokenize
	local function tokenize(word, ...)
		return _tokenize(word)
	end
	local function print_tokens(tokens)
		if type(tokens) == "string" then
			return tokens
		end
		local output = {}
		for i, token in ipairs(tokens) do
			output[i] = string.format(token_format, string.gsub(token, "%s", spacing))
		end
		return table.concat(output, " ")
	end
	return table.concat(map(print_tokens, map(tokenize, frame.args)), "<br>")
end

return export
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