#pragma once

#include <optional>
#include "exports.h"
#include "FileDefinition.h"

namespace craftlab::fakeraid
{
	class IEngine;

	struct DiffResult
	{
		std::map<std::string, std::vector<bool>> missingDirs;
		std::map<std::string, std::vector<bool>> missingFiles;
		std::map<std::string, std::vector<int>> differentFiles; // fileName -> { versionId, versionId, versionId }
		std::vector<File> correctFiles;
		std::map<std::string, FileAndSum> FileList;

		ENGINEAPI_EXPORT bool HasError() const;
	};

	class ENGINEAPI_EXPORT FileDiff
	{
	public:
		FileDiff();
		~FileDiff();

		DiffResult Process(const IEngine& engine, const FileAndSumListByRepositoryIndex& fileList);

	private:
		typedef std::optional<FileAndSum> OptionalFileAndSum;
		typedef std::vector<OptionalFileAndSum> ListOfOptionalFileAndSum;
		typedef std::map<std::string, ListOfOptionalFileAndSum> FileVersionList;

		FileVersionList GroupBy(const IEngine& engine, const FileAndSumListByRepositoryIndex& fileList, size_t indexCount);
		std::vector<int> computeVersionIds(const ListOfOptionalFileAndSum& versions);
		void CheckVersions(DiffResult& output, const std::string& fileKey, const ListOfOptionalFileAndSum& versions);
	};
}