local jid_split = require "util.jid".split;

module:depends"muc";

local webchat_baseurl = module:get_option_string("muc_webchat_baseurl", nil);

local function get_default_url(room)

	if not webchat_baseurl then

		-- no template

		return nil;

	end

	if room:get_hidden() or room:get_members_only() or room:get_password() then

		-- not a public room

		return nil;

	end

	return (webchat_baseurl:gsub("{(%w+)}", {

			jid = room.jid,

			node = select(1, jid_split(room.jid)),

			host = select(2, jid_split(room.jid)),

		}));

end

local function get_webchat_url(room)

	local webchat_url = room._data.webchat_url;

	if webchat_url then -- explicitly configured

		return webchat_url;

	end

	return get_default_url(room);

end

module:hook("muc-config-form", function(event)

	local room, form = event.room, event.form;

	table.insert(form, {

		name = "muc#roomconfig_webchat_url",

		type = "text-single",

		label = "URL where this room can be joined",

		value = get_webchat_url(room),

	});

end);

module:hook("muc-config-submitted", function(event)

	local room, fields, changed = event.room, event.fields, event.changed;

	local new = fields["muc#roomconfig_webchat_url"];

	if new ~= get_webchat_url(room) then

		if new == get_default_url(room) then

			room._data.webchat_url = nil;

		else

			room._data.webchat_url = new;

		end

		if type(changed) == "table" then

			changed["muc#roomconfig_webchat_url"] = true;

		else

			event.changed = true;

		end

	end

end);

module:hook("muc-disco#info", function (event)

	local room, form, formdata = event.room, event.form, event.formdata;

	local webchat_url = get_webchat_url(room);

	if not webchat_url or webchat_url == "" then

		return;

	end

	table.insert(form, {

		name = "muc#roominfo_webchat_url",

	});

	formdata["muc#roominfo_webchat_url"] = webchat_url;

end);