local mm = require "core.modulemanager";

if mm.get_modules_for_host(module.host):contains("bookmarks") then

	error("mod_bookmarks2 and mod_bookmarks are conflicting, please disable one of them.", 0);

end

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");

local namespace = "urn:xmpp:bookmarks:1";

local default_options = {

	["persist_items"] = true;

	-- This should be much higher, the XEP recommends 10000 but mod_pep rejects that.

	["max_items"] = "max";

	["send_last_published_item"] = "never";

	["access_model"] = "whitelist";

};

if not pcall(mod_pep.check_node_config, nil, nil, default_options) then

	-- 0.11 or earlier not supporting max_items="max" trows an error here

	module:log("debug", "Setting max_items=pep_max_items because 'max' is not supported in this version");

	default_options["max_items"] = module:get_option_number("pep_max_items", 256);

end

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

	-- This Time it’s Serious!

	event.reply:tag("feature", { var = namespace.."#compat" }):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 jid = username.."@"..session.host;

	local service = mod_pep.get_pep_service(username);

	local ok, ret = service:get_items(namespace, session.full_jid);

	if not ok then

		if ret == "item-not-found" then

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

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

		else

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

			session.send(st.error_reply(stanza, "cancel", ret, "Failed to retrive bookmarks from PEP"));

		end

		return true;

	end

	module:log("debug", "Sending back private for %s: %s", jid, storage);

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

	return true;

end

local function compare_bookmark2(a, b)

	if a == nil or b == nil then

		return false;

	end

	local a_conference = a:get_child("conference", namespace);

	local b_conference = b:get_child("conference", namespace);

	local a_nick = a_conference:get_child_text("nick");

	local b_nick = b_conference:get_child_text("nick");

	local a_password = a_conference:get_child_text("password");

	local b_password = b_conference:get_child_text("password");

	return (a.attr.id == b.attr.id and

	        a_conference.attr.name == b_conference.attr.name and

	        a_conference.attr.autojoin == b_conference.attr.autojoin and

	        a_nick == b_nick and

	        a_password == b_password);

end

local function publish_to_pep(jid, bookmarks, synchronise)

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

	if #bookmarks.tags == 0 then

		if synchronise then

			-- If we set zero legacy bookmarks, purge the bookmarks 2 node.

			module:log("debug", "No bookmark in the set, purging instead.");

			return service:purge(namespace, jid, true);

		else

			return true;

		end

	end

	-- Retrieve the current bookmarks2.

	module:log("debug", "Retrieving the current bookmarks 2.");

	local has_bookmarks2, ret = service:get_items(namespace, jid);

	local bookmarks2;

	if not has_bookmarks2 and ret == "item-not-found" then

		module:log("debug", "Got item-not-found, assuming it was empty until now, creating.");

		local ok, err = service:create(namespace, jid, default_options);

		if not ok then

			module:log("error", "Creating bookmarks 2 node failed: %s", err);

			return ok, err;

		end

		bookmarks2 = {};

	elseif not has_bookmarks2 then

		module:log("debug", "Got %s error, aborting.", ret);

		return false, ret;

	else

		module:log("debug", "Got existing bookmarks2.");

		bookmarks2 = ret;

	end

	-- Get a list of all items we may want to remove.

	local to_remove = {};

	for i in ipairs(bookmarks2) do

		to_remove[bookmarks2[i]] = true;

	end

	for bookmark in bookmarks:childtags("conference", "storage:bookmarks") do

		-- Create the new conference element by copying everything from the legacy one.

		local conference = st.stanza("conference", { xmlns = namespace });

		conference.attr.name = bookmark.attr.name;

		conference.attr.autojoin = bookmark.attr.autojoin;

		local nick = bookmark:get_child_text("nick", "storage:bookmarks");

		if nick ~= nil then

			conference:text_tag("nick", nick):up();

		end

		local password = bookmark:get_child_text("password", "storage:bookmarks");

		if password ~= nil then

			conference:text_tag("password", password):up();

		end

		-- Create its wrapper.

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

			:add_child(conference);

		-- Then publish it only if it’s a new one or updating a previous one.

		if compare_bookmark2(item, bookmarks2[bookmark.attr.jid]) then

			module:log("debug", "Item %s identical to the previous one, skipping.", item.attr.id);

			to_remove[bookmark.attr.jid] = nil;

		else

			if bookmarks2[bookmark.attr.jid] == nil then

				module:log("debug", "Item %s not existing previously, publishing.", item.attr.id);

			else

				module:log("debug", "Item %s different from the previous one, publishing.", item.attr.id);

				to_remove[bookmark.attr.jid] = nil;

			end

			local ok, err = service:publish(namespace, jid, bookmark.attr.jid, item, default_options);

			if not ok then

				module:log("error", "Publishing item %s failed: %s", item.attr.id, err);

				return ok, err;

			end

		end

	end

	-- Now handle retracting items that have been removed.

	if synchronise then

		for id in pairs(to_remove) do

			module:log("debug", "Item %s removed from bookmarks.", id);

			local ok, err = service:retract(namespace, jid, id, st.stanza("retract", { id = id }));

			if not ok then

				module:log("error", "Retracting item %s failed: %s", id, err);

				return ok, err;

			end

		end

	end

	return true;

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

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

	if not ok then

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

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

		return true;

	end

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

	return true;

end

local function migrate_legacy_bookmarks(event)

	local session = event.session;

	local username = session.username;

	local service = mod_pep.get_pep_service(username);

	local jid = username.."@"..session.host;

	local ok, ret = service:get_items("storage:bookmarks", session.full_jid);

	if ok then

		module:log("debug", "Legacy PEP bookmarks found for %s, migrating.", jid);

		local failed = false;

		for _, item_id in ipairs(ret) do

			local item = ret[item_id];

			if item.attr.id ~= "current" then

				module:log("warn", "Legacy PEP bookmarks for %s isn’t using 'current' as its id: %s", jid, item.attr.id);

			end

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

			module:log("debug", "Got legacy PEP bookmarks of %s: %s", jid, bookmarks);

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

			if not ok then

				module:log("error", "Failed to store legacy PEP bookmarks to bookmarks 2 for %s, aborting migration: %s", jid, err);

				failed = true;

				break;

			end

		end

		if not failed then

			module:log("debug", "Successfully migrated legacy PEP bookmarks of %s to bookmarks 2, attempting deletion of the node.", jid);

			local ok, err = service:delete("storage:bookmarks", jid);

			if not ok then

				module:log("error", "Failed to delete legacy PEP bookmarks for %s: %s", jid, err);

			end

		end

	end

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

	if not data then

		module:log("debug", "No existing legacy bookmarks for %s, migration already done: %s", jid, err);

		local ok, ret2 = service:get_items(namespace, session.full_jid);

		if not ok or not ret2 then

			module:log("debug", "Additionally, no bookmarks 2 were existing for %s, assuming empty.", jid);

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

		end

		return;

	end

	local bookmarks = st.deserialize(data);

	module:log("debug", "Got legacy bookmarks of %s: %s", jid, bookmarks);

	module:log("debug", "Going to store legacy bookmarks to bookmarks 2 %s.", jid);

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

	if not ok then

		module:log("error", "Failed to store legacy bookmarks to bookmarks 2 for %s, aborting migration: %s", jid, err);

		return;

	end

	module:log("debug", "Stored legacy bookmarks to bookmarks 2 for %s.", jid);

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

	if not ok then

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

		return;