local st = require "util.stanza";

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

local mod_pep = module:depends "pep";

local private_storage = module:open_store("private", "map");

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

	event.reply:tag("feature", { var = "urn:xmpp:bookmarks-conversion:0" }):up();

end);

local function on_retrieve_private_xml(event)

	local stanza, session = event.stanza, event.origin;

	local query = stanza:get_child("query", "jabber:iq:private");

	if query == nil then

		return;

	end

	local bookmarks = query:get_child("storage", "storage:bookmarks");

	if bookmarks == nil then

		return;

	end

	module:log("debug", "Getting private bookmarks: %s", bookmarks);

	local username = session.username;

	local service = mod_pep.get_pep_service(username);

	local ok, id, item = service:get_last_item("storage:bookmarks", session.full_jid);

	if not ok then

		module:log("error", "Failed to retrieve PEP bookmarks of %s: %s", username, id);

		session.send(st.error_reply(stanza, "cancel", "internal-server-error", "Failed to retrive bookmarks from PEP"));

		return;

	end

	if not id or not item then

		module:log("debug", "Got no PEP bookmarks item for %s, returning empty private bookmarks", username);

		session.send(st.reply(stanza):add_child(query));

		return

	end

	module:log("debug", "Got item %s: %s", id, item);

	local content = item.tags[1];

	module:log("debug", "Sending back private for %s: %s", username, content);

	session.send(st.reply(stanza):query("jabber:iq:private"):add_child(content));

	return true;

end

function publish_to_pep(jid, bookmarks)

	local service = mod_pep.get_pep_service(jid_split(jid));

	local item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = "current" })

		:add_child(bookmarks);

	local options = {

		["persist_items"] = true;

		["access_model"] = "whitelist";

	};

	return service:publish("storage:bookmarks", jid, "current", item, options);

end

-- Synchronise Private XML to PEP.

local function on_publish_private_xml(event)

	local stanza, session = event.stanza, event.origin;

	local query = stanza:get_child("query", "jabber:iq:private");

	if query == nil then

		return;

	end

	local bookmarks = query:get_child("storage", "storage:bookmarks");

	if bookmarks == nil then

		return;

	end

	module:log("debug", "Private bookmarks set by client, publishing to pep");

	local ok, err = publish_to_pep(session.full_jid, bookmarks);

	if not ok then

		module:log("error", "Failed to publish to PEP bookmarks for %s: %s", session.username, err);

		session.send(st.error_reply(stanza, "cancel", "internal-server-error", "Failed to store bookmarks to PEP"));

		return;

	end

	session.send(st.reply(stanza));

	return true;

end

local function on_resource_bind(event)

	local session = event.session;

	local username = session.username;

	local data, err = private_storage:get(username, "storage:storage:bookmarks");

	if not data then

		module:log("debug", "No existing Private XML bookmarks for %s, migration already done: %s", username, err);

		local service = mod_pep.get_pep_service(username);

		local ok, id = service:get_last_item("storage:bookmarks", session.full_jid);

		if not ok or not id then

			module:log("debug", "Additionally, no PEP bookmarks were existing for %s", username);

			module:fire_event("bookmarks/empty", { session = session });

		end

		return;

	end

	local bookmarks = st.deserialize(data);

	module:log("debug", "Got private bookmarks of %s: %s", username, bookmarks);

	module:log("debug", "Going to store PEP item for %s", username);

	local ok, err = publish_to_pep(session.full_jid, bookmarks);

	if not ok then

		module:log("error", "Failed to store bookmarks to PEP for %s, aborting migration: %s", username, err);

		return;

	end

	module:log("debug", "Stored bookmarks to PEP for %s", username);

	local ok, err = private_storage:set(username, "storage:storage:bookmarks", nil);

	if not ok then

		module:log("error", "Failed to remove private bookmarks of %s: %s", username, err);

		return;

	end

	module:log("debug", "Removed private bookmarks of %s, migration done!", username);

end

local function on_item_published(event)

end

module:hook("iq-get/bare/jabber:iq:private:query", on_retrieve_private_xml);

module:hook("iq-set/bare/jabber:iq:private:query", on_publish_private_xml);

module:hook("resource-bind", on_resource_bind);