local mod_muc = module:depends("muc")

local http = require "net.http"

local st = require "util.stanza"

local ogp_pattern = [[<meta property=["']?(og:.-)["']? content=%s*["']?(.-)["']?%s-/?>]]

local ogp_pattern2 = [[<meta content=%s*["']?(.-)["']? property=["']?(og:.-)["']?%s-/?>]]

local url_pattern = [[https?://%S+]]

local function ogp_handler(event)

	local room, stanza = event.room, st.clone(event.stanza)

	local body = stanza:get_child_text("body")

	if not body then return; end

	local url = body:match(url_pattern)

	if not url then return; end

	local origin_id = stanza:find("{urn:xmpp:sid:0}origin-id@id")

	if not origin_id then return; end

	http.request(

		url,

		nil,

		function(response_body, response_code, _)

			if response_code ~= 200 then

				return

			end

			local to = room.jid

			local from = room and room.jid or module.host

			local fastening = st.message({to = to, from = from}):tag("apply-to", {xmlns = "urn:xmpp:fasten:0", id = origin_id})

			local found_metadata = false

			local message_body = ""

			local meta_pattern = [[<meta (.-)/?>]]

			for match in response_body:gmatch(meta_pattern) do

				local property = match:match([[property=%s*["']?(og:.-)["']?%s]])

				if not property then

					property = match:match([[property=["']?(og:.-)["']$]])

				end

				local content = match:match([[content=%s*["'](.-)["']%s]])

				if not content then

					content = match:match([[content=["']?(.-)["']$]])

				end

				if not content then

					content = match:match([[content=(.-) property]])

				end

				if not content then

					content = match:match([[content=(.-)$]])

				end

				if property and content then

					module:log("info", property .. "\t" .. content)

					fastening:tag(

						"meta",

						{

							xmlns = "http://www.w3.org/1999/xhtml",

							property = property,

							content = content

						}

					):up()

					found_metadata = true

					message_body = message_body .. property .. "\t" .. content .. "\n"

				end

			end

			if found_metadata then

				mod_muc.get_room_from_jid(room.jid):broadcast_message(fastening)

			end

			module:log("info", tostring(fastening))

		end

	)

end

module:hook("muc-occupant-groupchat", ogp_handler)