package.path = package.path .. ";/<include_path>/?.lua"
driver = require('luasql.sqlite3')

BOT_TOKEN	= '<bot_token>'
API_URL 	= 'https://api.telegram.org/bot'..BOT_TOKEN..'/'
CHANNEL		= '<channel_id>'
ADMINS_CHAT	= {<admin_chat>}
ADMINS_ID	= {<admin_id>}

HTDOCS		= '<path>/htdocs/'
SYNC		= '<path>/htdocs/scusette/'
APP		= '<path>/app/scusette/'

DB		= APP..'db/scusette.sqlite3'
URL		= 'https://scusette.it/'

env = assert(driver.sqlite3())
con = assert(env:connect(DB))

ingiurie = {		"Coglione!",
			"Oh ma ce la fai?",
			"Ti ripigli?",
			"Ma quanto sei ritardato?",
			"Sei proprio un @w00tw00t",
			"Messaggio ricevuto, sei ritardato",
			"Per caso lavori in Accenture?",
			"Senior Manager in Spike Reply vero?",
			"http://www.gtfo.org",
			"Hai l'aria di uno che fa Big Data per KPMG",
			"Mandato il CV a Deloitte?"	
	}
help = [[
<strong>Scusette.it</strong> bot
Per ricevere una scusetta random
<pre>
/random
</pre>
Per cercare una scusetta
<pre>
/query
keyword
</pre>
Per inviare una scusetta invia un messaggio col seguente formato:
<pre>
/invia
titolo scusetta
corpo scusetta
</pre>
<em>Linee guida</em>:
 * Utilizza grammatica e capitalizzazione corrette
 * Il titolo e' il fatto e il corpo e' la scusetta in prima persona, prendi spunto da quelle gia' pubblicate 
 * Valuta se anche se scontestualizzata la scusetta e' divertente lo stesso
 * La scusetta deve essere stata usata
 * Le scusette saranno pubblicate solo previa approvazione di un admin
 * Sta calmo e non piangere pls
]]

function rows(connection, sql_statement)
	local cursor = assert(connection:execute(sql_statement))
	return function()
		return cursor:fetch()
	end
end

function generate(con)
	scusette = ""
	n = con:execute("select count(id) from scusette"):fetch()
	for id, slug, title, body, author, date in rows(con, "select id, slug, title, body, author, date from scusette where approved order by id desc") do
		scusette = scusette.."\t\t<hr><h3 id=\""..slug.."\"><a href=\""..URL.."#"..slug.."\">"..title.."</a></h3>\n\t\t<aside><small>"..date..", scusettebot</small></aside>\n\t\t<p>"..body.."</p>\n"
	end
	file = io.open(APP.."template/header.html", "r")
	io.input(file)
	header = io.read("*all")
	header = header:gsub("#scusettenumber#", tostring(n))
	io.close(file)
	file = io.open(APP.."template/footer.html", "r")
	io.input(file)
	footer = io.read("*all")
	io.input(file)
	file = io.open(HTDOCS.."index.html", "w")
	io.output(file)
	io.write(header..scusette..footer)
	io.close(file)
	file = io.open(SYNC.."scusette.html", "w")
	io.output(file)
	io.write(header..scusette..footer)
	io.close(file)
end

function is_admin(id)
	for _, admin_id in ipairs(ADMINS_ID) do
		if admin_id == id then
			return true 
		else
			return false
		end
	end

end

function reply (chatid, reply)
	local reply = ngx.escape_uri(reply)
	local httpc = require("resty.http").new()

	local res, err = httpc:request_uri(API_URL.."sendmessage", {
		method = "POST",
    		body = "chat_id="..chatid.."&text="..reply.."&parse_mode=HTML",
    		headers = {
	        	["Content-Type"] = "application/x-www-form-urlencoded",
		},
	})
	ngx.say(err)
end

ngx.req.read_body() 
content	= ngx.req.get_body_data()
if not content then
	ngx.exit(ngx.HTTP_BAD_REQUEST)
end

local json_local = require "json"
update	= json_local.decode(content)
if not update["message"] or not update["message"]["chat"] or not update["message"]["from"] or not update["message"]["text"] then
	ngx.exit(ngx.HTTP_BAD_REQUEST)
end
	
chatid = update["message"]["chat"]["id"]
fromid = update["message"]["from"]["id"]
fromusername = update["message"]["from"]["username"];
message = update["message"]["text"]

lines = {}
for l in message:gmatch("[^\n]+") do
	table.insert(lines, l)
end

command = lines[1]
if command == "/start" then
	resp = help
elseif command == "/invia" then
	title = lines[2]
	body = lines[3]
	if title and body then
		slug = lines[2]:gsub('%W','-'):lower()
		author = fromid
		r, e = con:execute(string.format("insert into scusette (slug, title, body, author, date, approved, rejected) values ('%s', '%s', '%s', '%s', CURRENT_TIMESTAMP, 0, 0)", con:escape(slug), con:escape(title), con:escape(body), con:escape(author)))
		if r then
			resp = "Scusetta inviata, se verra' approvata riceverai una notifica e la vedrai pubblicata!"
		else
			resp = "Qualcosa e' andato storto, contatta un admin"
		end
		for _, admin_chat_id in ipairs(ADMINS_CHAT) do
			id = con:getlastautoid()
			scusetta = string.format("<em>%s</em> - <pre>%s</pre> by @%s\n<em>%s</em>\n%s\n\n", id, slug, author, title, body)
			reply(admin_chat_id, "Nuova scusetta in coda, controlla con /list\n\n"..scusetta)
		end
	else
		resp = "Scusetta non valida, controlla la sintassi con /start"
	end
elseif command == "/list" then
	if is_admin(fromid) then
		list = ""
		for id, slug, title, body, author in rows (con, "select id, slug, title, body, author from scusette where not approved and not rejected") do
			list = list..string.format("<strong>%s</strong> by @%s\n<em>%s</em>\n%s\n\n", id, author, title, body)
			resp = list
		end
	end
elseif command == "/approve" then
	id = lines[2]
	if is_admin(fromid) and id then
		con:execute(string.format("update scusette set approved = 1 where id = '%s'", con:escape(tonumber(id))))
		generate(con)
		for id, slug, title, body, author in rows (con, "select id, slug, title, body, author from scusette where id = "..con:escape(tonumber(id))) do
			scusetta = string.format("<strong>%s</strong>\n%s\n\n%s/#%s", title, body, URL, slug)
			reply(author, "Scusetta approvata!")
			reply(CHANNEL, scusetta);
		end
		resp = "Operazione eseguita"
	else
		resp = "Nope"
	end
elseif command == "/delete" then
	id = lines[2]
	if is_admin(fromid) and id then
		con:execute(string.format("update scusette set rejected = 1 where id = '%s'", con:escape(tonumber(id))))
		resp = "Scusetta eliminata"
	else
		resp = "Nope"
	end
elseif command == "/rebuild" then
	if is_admin(fromid) then
		generate(con)
	end
elseif command == "/random" then
	for id, slug, title, body, author in rows (con, "select id, slug, title, body, author from scusette order by random() limit 1") do
		resp = string.format("<i><em>%s</em></i>\n%s\n\nhttps://scusette.it/#%s", title, body, slug)
	end
elseif command == "/query" then
	query = lines[2]
	for id, slug, title, body, author in rows (con, "select id, slug, title, body, author from scusette where title like '%"..con:escape(query).."%' or '%"..con:escape(query).."%' order by random() limit 1") do
		resp = string.format("<i><em>%s</em></i>\n%s\n\nhttps://scusette.it/#%s", title, body, slug)
	end
else
	if is_admin(fromid) then
		resp = "A rapporto!"
	else
		resp = ingiurie[math.random(#ingiurie)]
	end
end

con:commit()
con:close()
env:close()
reply(chatid, resp)