-- Copyright (C) 2009 Thilo Cestonaro
-- Copyright (C) 2009 Waqas Hussain
-- Copyright (C) 2009-2013 Matthew Wild
-- Copyright (C) 2013 Kim Alvefur
-- Copyright (C) 2013 Marco Cirillo

local hosts = prosody.hosts;
local tostring = tostring;
local split_jid = require "util.jid".split;
local datamanager = require"core.storagemanager".olddm;
local data_load, data_store = datamanager.load, datamanager.store;
local datastore = "muc_log";
local muc_form_config_option = "muc#roomconfig_enablelogging"

local log_by_default = module:get_option_boolean("muc_log_by_default", false);
local log_presences = module:get_option_boolean("muc_log_presences", true);

-- Module Definitions

local function get_room_from_jid(jid)
	local node, host = split_jid(jid);
	local component = hosts[host];
	if component then
		local muc = component.modules.muc
		if muc and rawget(muc,"rooms") then
			-- We're running 0.9.x or 0.10 (old MUC API)
			return muc.rooms[jid];
		elseif muc and rawget(muc,"get_room_from_jid") then
			-- We're running >0.10 (new MUC API)
			return muc.get_room_from_jid(jid);
		else
			return
		end
	end
end

local function logging_enabled(room)
	local enabled = room._data.logging;
	if enabled == nil then
		return log_by_default;
	end
	return enabled;
end

function log_if_needed(event)
	local stanza = event.stanza;

	if (stanza.name == "presence") or
		(stanza.name == "iq") or
		(stanza.name == "message" and tostring(stanza.attr.type) == "groupchat")
	then
		local node, host = split_jid(stanza.attr.to);
		if node and host then
			local bare = node .. "@" .. host;
			if get_room_from_jid(bare) then
				local room = get_room_from_jid(bare)

				local today = os.date("!%y%m%d");
				local now = os.date("!%H:%M:%S");

				local muc_to = nil
				local muc_from = nil;
				local already_joined = false;

				if room._data.hidden then -- do not log any data of private rooms
					return;
				end
				if not logging_enabled(room) then -- do not log where logging is not enabled
					return;
				end

				if stanza.name == "presence" and stanza.attr.type == nil then
					muc_from = stanza.attr.to;
					if room._occupants and room._occupants[stanza.attr.to] then
						already_joined = true;
						stanza:tag("alreadyJoined"):text("true");
					end
				elseif stanza.name == "iq" and stanza.attr.type == "set" then -- kick, to is the room, from is the admin, nick who is kicked is attr of iq->query->item
					if stanza.tags[1] and stanza.tags[1].name == "query" then
						local tmp = stanza.tags[1];
						if tmp.tags[1] ~= nil and tmp.tags[1].name == "item" and tmp.tags[1].attr.nick then
							tmp = tmp.tags[1];
							for jid, nick in pairs(room._jid_nick) do
								if nick == stanza.attr.to .. "/" .. tmp.attr.nick then
									muc_to = nick;
									break;
								end
							end
						end
					end
				else
					for jid, nick in pairs(room._jid_nick) do
						if jid == stanza.attr.from then
							muc_from = nick;
							break;
						end
					end
				end

				if (muc_from or muc_to) then
					local data = data_load(node, host, datastore .. "/" .. today);
					local realFrom = stanza.attr.from;
					local realTo = stanza.attr.to;

					if data == nil then
						data = {};
					end

					stanza.attr.from = muc_from;
					stanza.attr.to = muc_to;
					data[#data + 1] = "<stanza time=\"".. now .. "\">" .. tostring(stanza) .. "</stanza>\n";
					stanza.attr.from = realFrom;
					stanza.attr.to = realTo;
					if already_joined == true then
						if stanza[#stanza].name == "alreadyJoined" then  -- normaly the faked element should be the last, remove it when it is the last
							stanza[#stanza] = nil;
						else
							for i = 1, #stanza, 1 do
								if stanza[i].name == "alreadyJoined" then  -- remove the faked element
									stanza[i] = nil;
									break;
								end
							end
						end
					end
					datamanager.getpath(node, host, datastore, nil, true); -- create the datastore dir
					data_store(node, host, datastore .. "/" .. today, data);
				end
			end
		end
	end
end

module:hook("muc-config-form", function(event)
	local room, form = event.room, event.form;
	table.insert(form,
	{
		name = muc_form_config_option,
		type = "boolean",
		label = "Enable Logging?",
		value = logging_enabled(room),
	}
	);
end);

module:hook("muc-config-submitted", function(event)
	local room, fields, changed = event.room, event.fields, event.changed;
	local new = fields[muc_form_config_option];
	if new ~= room._data.logging then
		room._data.logging = new;
		if type(changed) == "table" then
			changed[muc_form_config_option] = true;
		else
			event.changed = true;
		end
	end
end);

module:hook("message/bare", log_if_needed, 1);
if log_presences then
	module:hook("iq/bare", log_if_needed, 1);
	module:hook("presence/full", log_if_needed, 1);
end

module:log("debug", "module mod_muc_log loaded!");