local st = require "util.stanza"

local send = require "core.sessionmanager".send_to_session

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

local t_concat = table.concat;

local rm_remove_from_roster = require "core.rostermanager".remove_from_roster;

local rm_add_to_roster = require "core.rostermanager".add_to_roster;

local rm_roster_push = require "core.rostermanager".roster_push;

add_iq_handler("c2s", "jabber:iq:roster", 

		function (session, stanza)

			if stanza.tags[1].name == "query" then

				if stanza.attr.type == "get" then

					local roster = st.reply(stanza)

								:query("jabber:iq:roster");

					for jid in pairs(session.roster) do

						if jid ~= "pending" then

							roster:tag("item", {

								jid = jid,

								subscription = session.roster[jid].subscription,

								ask = session.roster[jid].ask,

								name = session.roster[jid].name,

							});

							for group in pairs(session.roster[jid].groups) do

								roster:tag("group"):text(group):up();

							end

						end

					end

					send(session, roster);

					session.interested = true; -- resource is interested in roster updates

					return true;

				elseif stanza.attr.type == "set" then

					local query = stanza.tags[1];

					if #query.tags == 1 and query.tags[1].name == "item"

							and query.tags[1].attr.xmlns == "jabber:iq:roster" and query.tags[1].attr.jid

							and query.tags[1].attr.jid ~= "pending" then

						local item = query.tags[1];

						local from_node, from_host = jid_split(stanza.attr.from);

						local node, host, resource = jid_split(item.attr.jid);

						if not resource then

							if item.attr.jid ~= from_node.."@"..from_host then

								if item.attr.subscription == "remove" then

									if session.roster[item.attr.jid] then

										local success, err_type, err_cond, err_msg = rm_remove_from_roster(session, item.attr.jid);

										if success then

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

											rm_roster_push(from_node, from_host, item.attr.jid);

										else

											send(session, st.error_reply(stanza, err_type, err_cond, err_msg));

										end

									else

										send(session, st.error_reply(stanza, "modify", "item-not-found"));

									end

								else

									local r_item = {name = item.attr.name, groups = {}};

									if r_item.name == "" then r_item.name = nil; end

									if session.roster[item.attr.jid] then

										r_item.subscription = session.roster[item.attr.jid].subscription;

										r_item.ask = session.roster[item.attr.jid].ask;

									else

										r_item.subscription = "none";

									end

									for _, child in ipairs(item) do	

										if child.name == "group" then

											local text = t_concat(child);

											if text and text ~= "" then

												r_item.groups[text] = true;

											end

										end

									end

									local success, err_type, err_cond, err_msg = rm_add_to_roster(session, item.attr.jid, r_item);

									if success then

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

										rm_roster_push(from_node, from_host, item.attr.jid);

									else

										send(session, st.error_reply(stanza, err_type, err_cond, err_msg));

									end

								end

							else

								send(session, st.error_reply(stanza, "cancel", "not-allowed"));

							end

						else

							send(session, st.error_reply(stanza, "modify", "bad-request")); -- FIXME what's the correct error?

						end

					else

						send(session, st.error_reply(stanza, "modify", "bad-request"));

					end

					return true;

				end

			end

		end);