Bring more diversity in the radio mode. fixes #54

src/libs/services/recommendation/impl/playlist-constraints/ConsecutiveReleases.hpp

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2022 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "IConstraint.hpp"
+
+#include "services/database/ReleaseId.hpp"
+
+namespace Database
+{
+	class Db;
+}
+
+namespace Recommendation::PlaylistGeneratorConstraint
+{
+	class ConsecutiveReleases : public IConstraint
+	{
+		public:
+			ConsecutiveReleases(Database::Db& db);
+
+		private:
+			 float computeScore(const std::vector<Database::TrackId>& trackIds, std::size_t trackIndex) override;
+
+			 Database::ReleaseId getReleaseId(Database::TrackId trackId);
+
+			 Database::Db& _db;
+	};
+} // namespace Recommendation
+