/*
 * Copyright (C) 2019 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 <Wt/WDateTime.h>

#include <filesystem>
#include <vector>

namespace Scanner {

	enum class ScanErrorType
	{
		CannotReadFile,		// cannot read file
		CannotParseFile,	// cannot parse file
		NoAudioTrack,		// no audio track found
		BadDuration,		// bad duration
	};

	enum class DuplicateReason
	{
		SameHash,
		SameMBID,
	};

	struct ScanError
	{
		std::filesystem::path	file;
		ScanErrorType		error;
		std::string		systemError;

		ScanError(const std::filesystem::path& file, ScanErrorType error, const std::string& systemError = "");
	};

	struct ScanDuplicate
	{
		std::filesystem::path   file;
		DuplicateReason		reason;

	};

	// reduced scan stats
	struct ScanProgressStats
	{
		Wt::WDateTime   startTime;

		std::size_t     filesToScan {};
		std::size_t	processedFiles {};

		unsigned	progress() const;
	};

	struct ScanStats
	{
		Wt::WDateTime	startTime;
		Wt::WDateTime	stopTime;

		std::size_t	filesToScan {};		// Total number of files to be scanned (estimated)

		std::size_t	skips {};		// no change since last scan
		std::size_t	scans {};		// actually scanned filed

		std::size_t	additions {};		// Added in DB
		std::size_t	deletions {};		// removed from DB
		std::size_t	updates {};		// updated file in DB

		std::vector<ScanError>		errors;
		std::vector<ScanDuplicate>	duplicates;

		std::size_t	nbFiles() const;
		std::size_t	nbChanges() const;

		ScanProgressStats toProgressStats() const;
	};

}