local st = require "util.stanza";

local function getXml(user, host)

	local jid = user.."@"..host;

	local path = "data/"..jid..".xml";

	local f = io.open(path);

	if not f then return; end

	local s = f:read("*a");

	return parse_xml_real(s);

end

local function setXml(user, host, xml)

	local jid = user.."@"..host;

	local path = "data/"..jid..".xml";

	if xml then

		local f = io.open(path, "w");

		if not f then return; end

		local s = tostring(xml);

		f:write(s);

		f:close();

		return true;

	else

		return os.remove(path);

	end

end

local function getUserElement(xml)

	if xml and xml.name == "server-data" then

		local host = xml.tags[1];

		if host and host.name == "host" then

			local user = host.tags[1];

			if user and user.name == "user" then

				return user;

			end

		end

	end

end

local function createOuterXml(user, host)

	return st.stanza("server-data", {xmlns='http://www.xmpp.org/extensions/xep-0227.html#ns'})

		:tag("host", {jid=host})

			:tag("user", {name = user});

end

local function removeFromArray(array, value)

	for i,item in ipairs(array) do

		if item == value then

			table.remove(array, i);

			return;

		end

	end

end

local function removeStanzaChild(s, child)

	removeFromArray(s.tags, child);

	removeFromArray(s, child);

end

local handlers = {};

handlers.accounts = {

	get = function(self, user)

		local user = getUserElement(getXml(user, self.host));

		if user and user.attr.password then

			return { password = user.attr.password };

		end

	end;

	set = function(self, user, data)

		if data and data.password then

			local xml = getXml(user, self.host);

			if not xml then xml = createOuterXml(user, self.host); end

			local usere = getUserElement(xml);

			usere.attr.password = data.password;

			return setXml(user, self.host, xml);

		else

			return setXml(user, self.host, nil);

		end

	end;

};

handlers.vcard = {

	get = function(self, user)

		local user = getUserElement(getXml(user, self.host));

		if user then

			local vcard = user:get_child("vCard", 'vcard-temp');

			if vcard then

				return st.preserialize(vcard);

			end

		end

	end;

	set = function(self, user, data)

		local xml = getXml(user, self.host);

		local usere = xml and getUserElement(xml);

		if usere then

			local vcard = usere:get_child("vCard", 'vcard-temp');

			if vcard then

				removeStanzaChild(usere, vcard);

			elseif not data then

				return true;

			end

			if data then

				vcard = st.deserialize(data);

				usere:add_child(vcard);

			end

			return setXml(user, self.host, xml);

		end

		return true;

	end;

};

handlers.private = {

	get = function(self, user)

		local user = getUserElement(getXml(user, self.host));

		if user then

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

			if private then

				local r = {};

				for _, tag in ipairs(private.tags) do

					r[tag.name..":"..tag.attr.xmlns] = st.preserialize(tag);

				end

				return r;

			end

		end

	end;

	set = function(self, user, data)

		local xml = getXml(user, self.host);

		local usere = xml and getUserElement(xml);

		if usere then

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

			if private then removeStanzaChild(usere, private); end

			if data and next(data) ~= nil then

				private = st.stanza("query", {xmlns='jabber:iq:private'});

				for _,tag in pairs(data) do

					private:add_child(st.deserialize(tag));

				end

				usere:add_child(private);

			end

			return setXml(user, self.host, xml);

		end

		return true;

	end;

};

-----------------------------

local driver = {};

driver.__index = driver;

function driver:open(host, datastore, typ)

	local cache_key = host.." "..datastore;

	if self.ds_cache[cache_key] then return self.ds_cache[cache_key]; end

	local instance = setmetatable({}, self);

	instance.host = host;

	instance.datastore = datastore;

	local handler = handlers[datastore];

	if not handler then return nil; end

	for key,val in pairs(handler) do

		instance[key] = val;

	end

	if instance.init then instance:init(); end

	self.ds_cache[cache_key] = instance;

	return instance;

end

-----------------------------

local _M = {};

function _M.new()

	local instance = setmetatable({}, driver);

	instance.__index = instance;

	instance.ds_cache = {};

	return instance;

end

return _M;