if not config.lastfm_api_key then
	print('Missing config value: lastfm_api_key.')
	print('lastfm.lua will not be enabled.')
	return
end

local doc = [[
	/lastfm
	/np [username]
	Returns what you are or were last listening to. If you specify a username, info will be returned for that username.
	/fmset <username>
	Sets your last.fm username. Otherwise, /np will use your Telegram username. Use "/fmset -" to delete it.
]]

local triggers = {
	'^/lastfm[@'..bot.username..']*',
	'^/np[@'..bot.username..']*',
	'^/fmset[@'..bot.username..']*'
}

local action = function(msg)

	lastfm = load_data('lastfm.json')
	local input = msg.text:input()

	if string.match(msg.text, '^/lastfm') then
		sendReply(msg, doc:sub(10))
		return
	elseif string.match(msg.text, '^/fmset') then
		if not input then
			sendReply(msg, doc)
		elseif input == '-' then
			lastfm[msg.from.id_str] = nil
			sendReply(msg, 'Your last.fm username has been forgotten.')
		else
			lastfm[msg.from.id_str] = input
			sendReply(msg, 'Your last.fm username has been set to "' .. input .. '".')
		end
		save_data('lastfm.json', lastfm)
		return
	end

	local url = 'http://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&format=json&limit=1&api_key=' .. config.lastfm_api_key .. '&user='

	local username
	local output = ''
	if input then
		username = input
	elseif lastfm[msg.from.id_str] then
		username = lastfm[msg.from.id_str]
	elseif msg.from.username then
		username = msg.from.username
		output = '\n\nYour username has been set to ' .. username .. '.\nTo change it, use /fmset <username>.'
		lastfm[msg.from.id_str] = username
		save_data('lastfm.json', lastfm)
	else
		sendReply(msg, 'Please specify your last.fm username or set it with /fmset.')
		return
	end

	url = url .. URL.escape(username)

	jstr, res = HTTPS.request(url)
	if res ~= 200 then
		sendReply(msg, config.errors.connection)
		return
	end

	local jdat = JSON.decode(jstr)
	if jdat.error then
		sendReply(msg, config.errors.results)
		return
	end

	local jdat = jdat.recenttracks.track[1] or jdat.recenttracks.track
	if not jdat then
		sendReply(msg, 'No history for this user.' .. output)
		return
	end

	local message = input or msg.from.first_name
	message = '🎵  ' .. message

	if jdat['@attr'] and jdat['@attr'].nowplaying then
		message = message .. ' is currently listening to:\n'
	else
		message = message .. ' last listened to:\n'
	end

	local title = jdat.name or 'Unknown'
	local artist = 'Unknown'
	if jdat.artist then
		artist = jdat.artist['#text']
	end

	message = message .. title .. ' - ' .. artist .. output
	sendMessage(msg.chat.id, message)

end

return {
	action = action,
	triggers = triggers,
	doc = doc
}