local http = require("socket.http")

function makeRequest(artist, song)
	local webPage, statusCode = 
http.request("http://www.metrolyrics.com/" .. song .. "-lyrics-" .. artist 
.. ".html")
	if statusCode == 200 then return webPage else print("Música não 
encontrada") os.exit() end
end

function concat(str)
	local fstr = ''
	for ech in string.gmatch(str,"%Z") do
		if ech == " " then
			fstr = fstr .. "-"
		else
			fstr = fstr .. ech
		end
	end
	return string.lower(fstr)
end

function textOnly(verses)
	local txt = ''
	local ftxt = ''
	for initP in string.gmatch(verses, ">%Z-<") do
		txt = txt .. initP
	end
	for tag in string.gmatch(txt, "%Z") do
		if tag == "<" then
			ftxt = ftxt .. "\n"
		elseif tag == ">" then
			ftxt = ftxt .. ""
		else
			ftxt = ftxt .. tag
		end
	end
	return ftxt
end

function noEnter(text)
	local ans = ''
	for n in string.gmatch(text, "%Z%Z") do
		if n == "\n\n" then
			ans = ans .. "\n"
		else
			ans = ans .. n
		end
	end
	return ans
end

function parseLyrics(entPage)
	local verses = ''
	for verse in string.gmatch(entPage, "<p class='verse'>%Z-</p>") do
		verses = verses .. verse
	end
	return noEnter(textOnly(verses))
end

io.write("Insira o artista: ")
local artist = io.read()
io.write("Insira a música: ")
local song = io.read()
if artist and song then
	print(parseLyrics(makeRequest(concat(artist), concat(song))))
end