local st = require "util.stanza";

local uuid_generate = require "util.uuid".generate;

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

local xmlns_pubsub_errors = "http://jabber.org/protocol/pubsub#errors";

local _M = {};

local handlers = {};

_M.handlers = handlers;

local pubsub_errors = {

	["conflict"] = { "cancel", "conflict" };

	["invalid-jid"] = { "modify", "bad-request", nil, "invalid-jid" };

	["jid-required"] = { "modify", "bad-request", nil, "jid-required" };

	["nodeid-required"] = { "modify", "bad-request", nil, "nodeid-required" };

	["item-not-found"] = { "cancel", "item-not-found" };

	["not-subscribed"] = { "modify", "unexpected-request", nil, "not-subscribed" };

	["forbidden"] = { "cancel", "forbidden" };

};

local function pubsub_error_reply(stanza, error)

	local e = pubsub_errors[error];

	local reply = st.error_reply(stanza, unpack(e, 1, 3));

	if e[4] then

		reply:tag(e[4], { xmlns = xmlns_pubsub_errors }):up();

	end

	return reply;

end

_M.pubsub_error_reply = pubsub_error_reply;

function handlers.get_items(origin, stanza, items, service)

	local node = items.attr.node;

	local item = items:get_child("item");

	local id = item and item.attr.id;

	if not node then

		return origin.send(pubsub_error_reply(stanza, "nodeid-required"));

	end

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

	if not ok then

		return origin.send(pubsub_error_reply(stanza, results));

	end

	local data = st.stanza("items", { node = node });

	for _, entry in pairs(results) do

		data:add_child(entry);

	end

	local reply;

	if data then

		reply = st.reply(stanza)

			:tag("pubsub", { xmlns = xmlns_pubsub })

				:add_child(data);

	else

		reply = pubsub_error_reply(stanza, "item-not-found");

	end

	return origin.send(reply);

end

function handlers.get_subscriptions(origin, stanza, subscriptions, service)

	local node = subscriptions.attr.node;

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

	if not ok then

		return origin.send(pubsub_error_reply(stanza, ret));

	end

	local reply = st.reply(stanza)

		:tag("pubsub", { xmlns = xmlns_pubsub })

			:tag("subscriptions");

	for _, sub in ipairs(ret) do

		reply:tag("subscription", { node = sub.node, jid = sub.jid, subscription = 'subscribed' }):up();

	end

	return origin.send(reply);

end

function handlers.set_create(origin, stanza, create, service)

	local node = create.attr.node;

	local ok, ret, reply;

	if node then

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

		if ok then

			reply = st.reply(stanza);

		else

			reply = pubsub_error_reply(stanza, ret);

		end

	else

		repeat

			node = uuid_generate();

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

		until ok or ret ~= "conflict";

		if ok then

			reply = st.reply(stanza)

				:tag("pubsub", { xmlns = xmlns_pubsub })

					:tag("create", { node = node });

		else

			reply = pubsub_error_reply(stanza, ret);

		end

	end

	return origin.send(reply);

end

function handlers.set_delete(origin, stanza, delete, service)

	local node = delete.attr.node;

	local reply, notifier;

	if not node then

		return origin.send(pubsub_error_reply(stanza, "nodeid-required"));

	end

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

	if ok then

		reply = st.reply(stanza);

	else

		reply = pubsub_error_reply(stanza, ret);

	end

	return origin.send(reply);

end

function handlers.set_subscribe(origin, stanza, subscribe, service)

	local node, jid = subscribe.attr.node, subscribe.attr.jid;

	if not (node and jid) then

		return origin.send(pubsub_error_reply(stanza, jid and "nodeid-required" or "invalid-jid"));

	end

	--[[

	local options_tag, options = stanza.tags[1]:get_child("options"), nil;

	if options_tag then

		options = options_form:data(options_tag.tags[1]);

	end

	--]]

	local options_tag, options; -- FIXME

	local ok, ret = service:add_subscription(node, stanza.attr.from, jid, options);

	local reply;

	if ok then

		reply = st.reply(stanza)

			:tag("pubsub", { xmlns = xmlns_pubsub })

				:tag("subscription", {

					node = node,

					jid = jid,

					subscription = "subscribed"

				}):up();

		if options_tag then

			reply:add_child(options_tag);

		end

	else

		reply = pubsub_error_reply(stanza, ret);

	end

	origin.send(reply);

end

function handlers.set_unsubscribe(origin, stanza, unsubscribe, service)

	local node, jid = unsubscribe.attr.node, unsubscribe.attr.jid;

	if not (node and jid) then

		return origin.send(pubsub_error_reply(stanza, jid and "nodeid-required" or "invalid-jid"));

	end

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

	local reply;

	if ok then

		reply = st.reply(stanza);

	else

		reply = pubsub_error_reply(stanza, ret);

	end

	return origin.send(reply);

end

function handlers.set_publish(origin, stanza, publish, service)

	local node = publish.attr.node;

	if not node then

		return origin.send(pubsub_error_reply(stanza, "nodeid-required"));

	end

	local item = publish:get_child("item");

	local id = (item and item.attr.id);

	if not id then

		id = uuid_generate();

		if item then

			item.attr.id = id;

		end

	end

	local ok, ret = service:publish(node, stanza.attr.from, id, item);

	local reply;

	if ok then

		reply = st.reply(stanza)

			:tag("pubsub", { xmlns = xmlns_pubsub })

				:tag("publish", { node = node })

					:tag("item", { id = id });

	else

		reply = pubsub_error_reply(stanza, ret);

	end

	return origin.send(reply);

end

function handlers.set_retract(origin, stanza, retract, service)

	local node, notify = retract.attr.node, retract.attr.notify;

	notify = (notify == "1") or (notify == "true");

	local item = retract:get_child("item");

	local id = item and item.attr.id

	if not (node and id) then

		return origin.send(pubsub_error_reply(stanza, node and "item-not-found" or "nodeid-required"));

	end

	local reply, notifier;

	if notify then

		notifier = st.stanza("retract", { id = id });

	end

	local ok, ret = service:retract(node, stanza.attr.from, id, notifier);

	if ok then

		reply = st.reply(stanza);

	else

		reply = pubsub_error_reply(stanza, ret);

	end

	return origin.send(reply);

end

function handlers.set_purge(origin, stanza, purge, service)

	local node, notify = purge.attr.node, purge.attr.notify;

	notify = (notify == "1") or (notify == "true");

	local reply;

	if not node then

		return origin.send(pubsub_error_reply(stanza, "nodeid-required"));

	end

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

	if ok then

		reply = st.reply(stanza);

	else

		reply = pubsub_error_reply(stanza, ret);

	end

	return origin.send(reply);

end

return _M;