local pubsub = require "prosody.util.pubsub";

local st = require "prosody.util.stanza";

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

local new_id = require "prosody.util.id".medium;

local storagemanager = require "prosody.core.storagemanager";

local xtemplate = require "prosody.util.xtemplate";

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 service_expose_publisher = module:get_option_boolean("expose_publisher")

local service;

local lib_pubsub = module:require "pubsub";

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

-- An itemstore supports the following methods:

--   items(): iterator over (id, item)

--   get(id): return item with id

--   set(id, item): set id to item

--   clear(): clear all items

--   resize(n): set new limit and trim oldest items

--   tail(): return the latest item

-- A nodestore supports the following methods:

--   set(node_name, node_data)

--   get(node_name)

--   users(): iterator over (node_name)

local max_max_items = module:get_option_integer("pubsub_max_items", 256, 1);

local function tonumber_max_items(n)

	if n == "max" then

		return max_max_items;

	end

	return tonumber(n);

end

for _, field in ipairs(lib_pubsub.node_config_form) do

	if field.var == "pubsub#max_items" then

		field.range_max = max_max_items;

		break;

	end

end

local node_store = module:open_store(module.name.."_nodes");

local function create_simple_itemstore(node_config, node_name) --> util.cache like object

	local driver = storagemanager.get_driver(module.host, "pubsub_data");

	local archive = driver:open("pubsub_"..node_name, "archive");

	local max_items = tonumber_max_items(node_config["max_items"]);

	return lib_pubsub.archive_itemstore(archive, max_items, nil, node_name);

end

function simple_broadcast(kind, node, jids, item, actor, node_obj, service) --luacheck: ignore 431/service

	if node_obj then

		if node_obj.config["notify_"..kind] == false then

			return;

		end

	end

	if kind == "retract" then

		kind = "items"; -- XEP-0060 signals retraction in an <items> container

	end

	if item then

		item = st.clone(item);

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

		if kind == "items" then

			if node_obj and node_obj.config.include_payload == false then

				item:maptags(function () return nil; end);

			end

			local node_expose_publisher = service_expose_publisher;

			if node_expose_publisher == nil and node_obj and node_obj.config.itemreply == "publisher" then

				node_expose_publisher = true;

			end

			if not node_expose_publisher then

				item.attr.publisher = nil;

			elseif not item.attr.publisher and actor ~= true then

				item.attr.publisher = service.config.normalize_jid(actor);

			end

		end

	end

	local id = new_id();

	local msg_type = node_obj and node_obj.config.notification_type or "headline";

	local message = st.message({ from = module.host, type = msg_type, id = id })

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

			:tag(kind, { node = node });

	if item then

		message:add_child(item);

	end

	local summary;

	if item and item.tags[1] then

		local payload = item.tags[1];

		local payload_type = node_obj and node_obj.config.payload_type or payload.attr.xmlns;

		summary = module:fire_event("pubsub-summary/"..payload_type, {

			kind = kind, node = node, jids = jids, actor = actor, item = item, payload = payload,

		});

	end

	for jid, options in pairs(jids) do

		local new_stanza = st.clone(message);

		if summary and type(options) == "table" and options["pubsub#include_body"] then

			new_stanza:body(summary);

		end

		new_stanza.attr.to = jid;

		module:send(new_stanza);

	end

end

function check_node_config(node, actor, new_config) -- luacheck: ignore 212/node 212/actor

	if (tonumber_max_items(new_config["max_items"]) or 1) > max_max_items then

		return false;

	end

	if new_config["access_model"] ~= "whitelist"

	and new_config["access_model"] ~= "open" then

		return false;

	end

	return true;

end

function is_item_stanza(item)

	return st.is_stanza(item) and item.attr.xmlns == xmlns_pubsub and item.name == "item" and #item.tags == 1;

end

-- Compose a textual representation of Atom payloads

local summary_templates = module:get_option("pubsub_summary_templates", {

	["http://www.w3.org/2005/Atom"] = "{@pubsub:title|and{*{@pubsub:title}*\n\n}}{summary|or{{author/name|and{{author/name} posted }}{title}}}";

})

for pubsub_type, template in pairs(summary_templates) do

	module:hook("pubsub-summary/"..pubsub_type, function (event)

		local payload = event.payload;

		local got_config, node_config = service:get_node_config(event.node, true);

		if got_config then

			payload = st.clone(payload);

			payload.attr["xmlns:pubsub"] = xmlns_pubsub;

			payload.attr["pubsub:node"] = event.node;

			payload.attr["pubsub:title"] = node_config.title;

			payload.attr["pubsub:description"] = node_config.description;

		end

		return xtemplate.render(template, payload, tostring);

	end, -1);

end

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

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

local function add_disco_features_from_service(service) --luacheck: ignore 431/service

	for feature in lib_pubsub.get_feature_set(service) do

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

	end

end

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

	return lib_pubsub.handle_disco_info_node(event, service);

end);

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

	return lib_pubsub.handle_disco_items_node(event, service);

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.title }):up();

	end

end);

local admin_aff = module:get_option_enum("default_admin_affiliation", "owner", "publisher", "member", "outcast", "none");

module:default_permission("prosody:admin", ":service-admin");

local function get_affiliation(jid)

	local bare_jid = jid_bare(jid);

	if bare_jid == module.host or module:may(":service-admin", bare_jid) then

		return admin_aff;

	end

end

function get_service()

	return service;

end

function set_service(new_service)

	service = new_service;

	service.config.autocreate_on_publish = autocreate_on_publish;

	service.config.autocreate_on_subscribe = autocreate_on_subscribe;

	service.config.expose_publisher = service_expose_publisher;

	service.config.nodestore = node_store;

	service.config.itemstore = create_simple_itemstore;

	service.config.broadcaster = simple_broadcast;

	service.config.itemcheck = is_item_stanza;

	service.config.check_node_config = check_node_config;

	service.config.get_affiliation = get_affiliation;

	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({

		autocreate_on_publish = autocreate_on_publish;

		autocreate_on_subscribe = autocreate_on_subscribe;

		expose_publisher = service_expose_publisher;

		node_defaults = {

			["persist_items"] = true;

		};

		max_items = max_max_items;

		nodestore = node_store;

		itemstore = create_simple_itemstore;

		broadcaster = simple_broadcast;

		itemcheck = is_item_stanza;

		check_node_config = check_node_config;

		get_affiliation = get_affiliation;

		jid = module.host;

		normalize_jid = jid_bare;

	}));

end