+/*
+ Copyright (C) 2018 Carl Hetherington <cth@carlh.net>
+
+ This file is part of DCP-o-matic.
+
+ DCP-o-matic is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ DCP-o-matic is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "analytics.h"
+#include "exceptions.h"
+#include <dcp/raw_convert.h>
+#include <libcxml/cxml.h>
+#include <libxml++/libxml++.h>
+#include <boost/filesystem.hpp>
+#include <boost/algorithm/string.hpp>
+
+using std::string;
+using dcp::raw_convert;
+using boost::algorithm::trim;
+
+Analytics* Analytics::_instance;
+int const Analytics::_current_version = 1;
+
+Analytics::Analytics ()
+ : _successful_dcp_encodes (0)
+{
+
+}
+
+void
+Analytics::successful_dcp_encode ()
+{
+ ++_successful_dcp_encodes;
+ write ();
+}
+
+void
+Analytics::write () const
+{
+ xmlpp::Document doc;
+ xmlpp::Element* root = doc.create_root_node ("Analytics");
+
+ root->add_child("Version")->add_child_text(raw_convert<string>(_current_version));
+ root->add_child("SuccessfulDCPEncodes")->add_child_text(raw_convert<string>(_successful_dcp_encodes));
+
+ try {
+ doc.write_to_file_formatted(path("analytics.xml").string());
+ } catch (xmlpp::exception& e) {
+ string s = e.what ();
+ trim (s);
+ throw FileError (s, path("analytics.xml"));
+ }
+}
+
+void
+Analytics::read ()
+try
+{
+ cxml::Document f ("Analytics");
+ f.read_file (path("analytics.xml"));
+ _successful_dcp_encodes = f.number_child<int>("SuccessfulDCPEncodes");
+} catch (...) {
+ /* Never mind */
+}
+
+Analytics*
+Analytics::instance ()
+{
+ if (!_instance) {
+ _instance = new Analytics();
+ _instance->read();
+ }
+
+ return _instance;
+}