local pubsub = require "util.pubsub";

local st = require "util.stanza";

local jid_bare = require "util.jid".bare;

local usermanager = require "core.usermanager";

local xmlns_pubsub = "http://jabber.org/protocol/pubsub";

local xmlns_pubsub_event = "http://jabber.org/protocol/pubsub#event";

local xmlns_pubsub_owner = "http://jabber.org/protocol/pubsub#owner";

local autocreate_on_publish = module:get_option_boolean("autocreate_on_publish", false);

local autocreate_on_subscribe = module:get_option_boolean("autocreate_on_subscribe", false);

local pubsub_disco_name = module:get_option_string("name", "Prosody PubSub Service");

local expose_publisher = module:get_option_boolean("expose_publisher", false)

local enable_persistence = module:get_option_boolean("experimental_pubsub_item_persistence", false);

local service;

local lib_pubsub = module:require "pubsub";

local handlers = lib_pubsub.handlers;

module:depends("disco");

module:add_identity("pubsub", "service", pubsub_disco_name);

module:add_feature("http://jabber.org/protocol/pubsub");

function handle_pubsub_iq(event)

	return lib_pubsub.handle_pubsub_iq(event, service);

end

local function simple_itemstore(config, node)

	local archive = module:open_store("pubsub_"..node, "archive");

	return lib_pubsub.archive_itemstore(archive, config, nil, node);

end

if enable_persistence then

	module:log("warn", "Item persistence is an experimental feature. Note that ownership information is lost on restart.")

else

	simple_itemstore = nil;

end

function simple_broadcast(kind, node, jids, item, actor)

	if item then

		item = st.clone(item);

		item.attr.xmlns = nil; -- Clear the pubsub namespace

		if expose_publisher and actor then

			item.attr.publisher = actor

		end

	end

	local message = st.message({ from = module.host, type = "headline" })

		:tag("event", { xmlns = xmlns_pubsub_event })

			:tag(kind, { node = node })

				:add_child(item);

	for jid in pairs(jids) do

		module:log("debug", "Sending notification to %s", jid);

		message.attr.to = jid;

		module:send(message);

	end

end

module:hook("iq/host/"..xmlns_pubsub..":pubsub", handle_pubsub_iq);

module:hook("iq/host/"..xmlns_pubsub_owner..":pubsub", handle_pubsub_iq);

local feature_map = {

	retract = { "delete-items", "retract-items" };

	purge = { "purge-nodes" };

	publish = { "publish", autocreate_on_publish and "auto-create" };

	delete = { "delete-nodes" };

	get_items = { "retrieve-items" };

	add_subscription = { "subscribe" };

	get_subscriptions = { "retrieve-subscriptions" };

	set_node_config = { "config-node" };

	node_defaults = { "retrieve-default" };

};

local function add_disco_features_from_service(service)

	for method, features in pairs(feature_map) do

		if service[method] then

			for _, feature in ipairs(features) do

				if feature then

					module:add_feature(xmlns_pubsub.."#"..feature);

				end

			end

		end

	end

	for affiliation in pairs(service.config.capabilities) do

		if affiliation ~= "none" and affiliation ~= "owner" then

			module:add_feature(xmlns_pubsub.."#"..affiliation.."-affiliation");

		end

	end

end

module:hook("host-disco-info-node", function (event)

	local stanza, reply, node = event.stanza, event.reply, event.node;

	local ok, ret = service:get_nodes(stanza.attr.from);

	if not ok or not ret[node] then

		return;

	end

	event.exists = true;

	reply:tag("identity", { category = "pubsub", type = "leaf" });

end);

module:hook("host-disco-items-node", function (event)

	local stanza, reply, node = event.stanza, event.reply, event.node;

	local ok, ret = service:get_items(node, stanza.attr.from);

	if not ok then

		return;

	end

	for _, id in ipairs(ret) do

		reply:tag("item", { jid = module.host, name = id }):up();

	end

	event.exists = true;

end);

module:hook("host-disco-items", function (event)

	local stanza, reply = event.stanza, event.reply;

	local ok, ret = service:get_nodes(stanza.attr.from);

	if not ok then

		return;

	end

	for node, node_obj in pairs(ret) do

		reply:tag("item", { jid = module.host, node = node, name = node_obj.config.name }):up();

	end

end);

local admin_aff = module:get_option_string("default_admin_affiliation", "owner");

local function get_affiliation(jid)

	local bare_jid = jid_bare(jid);

	if bare_jid == module.host or usermanager.is_admin(bare_jid, module.host) then

		return admin_aff;

	end

end

function set_service(new_service)

	service = new_service;

	module.environment.service = service;

	add_disco_features_from_service(service);

end

function module.save()

	return { service = service };

end

function module.restore(data)

	set_service(data.service);

end

function module.load()

	if module.reloading then return; end

	set_service(pubsub.new({

		capabilities = {

			none = {

				create = false;

				publish = false;

				retract = false;

				get_nodes = true;

				subscribe = true;

				unsubscribe = true;

				get_subscription = true;

				get_subscriptions = true;

				get_items = true;

				subscribe_other = false;

				unsubscribe_other = false;

				get_subscription_other = false;

				get_subscriptions_other = false;

				be_subscribed = true;

				be_unsubscribed = true;

				set_affiliation = false;

			};

			publisher = {

				create = false;

				publish = true;

				retract = true;

				get_nodes = true;

				subscribe = true;

				unsubscribe = true;

				get_subscription = true;

				get_subscriptions = true;

				get_items = true;

				subscribe_other = false;

				unsubscribe_other = false;

				get_subscription_other = false;

				get_subscriptions_other = false;

				be_subscribed = true;

				be_unsubscribed = true;

				set_affiliation = false;

			};

			owner = {

				create = true;

				publish = true;

				retract = true;

				delete = true;

				get_nodes = true;

				configure = true;

				subscribe = true;

				unsubscribe = true;

				get_subscription = true;

				get_subscriptions = true;

				get_items = true;

				subscribe_other = true;

				unsubscribe_other = true;

				get_subscription_other = true;

				get_subscriptions_other = true;

				be_subscribed = true;

				be_unsubscribed = true;

				set_affiliation = true;

			};

		};

		autocreate_on_publish = autocreate_on_publish;

		autocreate_on_subscribe = autocreate_on_subscribe;

		itemstore = simple_itemstore;

		broadcaster = simple_broadcast;

		get_affiliation = get_affiliation;

		normalize_jid = jid_bare;

	}));

end