local xkcd = {}

local HTTP = require('socket.http')
local JSON = require('dkjson')
local utilities = require('otouto.utilities')

xkcd.command = 'xkcd [i]'
xkcd.base_url = 'https://xkcd.com/info.0.json'
xkcd.strip_url = 'http://xkcd.com/%s/info.0.json'

function xkcd:init(config)
	xkcd.triggers = utilities.triggers(self.info.username, config.cmd_pat):t('xkcd', true).table
	xkcd.doc = config.cmd_pat .. [[xkcd [i]
Returns the latest xkcd strip and its alt text. If a number is given, returns that number strip. If "r" is passed in place of a number, returns a random strip.]]
	local jstr = HTTP.request(xkcd.base_url)
	if jstr then
		local data = JSON.decode(jstr)
		if data then
			xkcd.latest = data.num
		end
	end
	xkcd.latest = xkcd.latest or 1700
end

function xkcd:action(msg, config)
	local input = utilities.get_word(msg.text, 2)
	if input == 'r' then
		input = math.random(xkcd.latest)
	elseif tonumber(input) then
		input = tonumber(input)
	else
		input = xkcd.latest
	end
	local url = xkcd.strip_url:format(input)
	local jstr, code = HTTP.request(url)
	if code == 404 then
		utilities.send_reply(self, msg, config.errors.results)
	elseif code ~= 200 then
		utilities.send_reply(self, msg, config.errors.connection)
	else
		local data = JSON.decode(jstr)
		local output = string.format('*%s (*[%s](%s)*)*\n_%s_',
			data.safe_title:gsub('*', '*\\**'),
			data.num,
			data.img,
			data.alt:gsub('_', '_\\__')
		)
		utilities.send_message(self, msg.chat.id, output, false, nil, true)
	end
end

return xkcd