// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include <zencore/zencore.h>

#include <zencore/iobuffer.h>
#include <zencore/iohash.h>
#include <zencore/string.h>
#include <zencore/thread.h>
#include <zenstore/cas.h>

namespace zen {

struct FileCasStrategy
{
	FileCasStrategy(const CasStoreConfiguration& Config, CasStore::Stats& Stats) : m_Config(Config), m_Stats(Stats) {}
	CasStore::InsertResult InsertChunk(const void* ChunkData, size_t ChunkSize, const IoHash& ChunkHash);
	CasStore::InsertResult InsertChunk(IoBuffer Chunk, const IoHash& ChunkHash);
	IoBuffer			   FindChunk(const IoHash& ChunkHash);
	bool				   HaveChunk(const IoHash& ChunkHash);
	void				   FilterChunks(CasChunkSet& InOutChunks);
	void				   Flush();
	void				   GarbageCollect(GcContext& GcCtx);

private:
	const CasStoreConfiguration& m_Config;
	CasStore::Stats&			 m_Stats;
	RwLock						 m_Lock;
	RwLock						 m_ShardLocks[256];	 // TODO: these should be spaced out so they don't share cache lines

	inline RwLock&				  LockForHash(const IoHash& Hash) { return m_ShardLocks[Hash.Hash[19]]; }
	static WideStringBuilderBase& MakeShardedPath(WideStringBuilderBase& ShardedPath, const IoHash& ChunkHash, size_t& OutShard2len);
};

}  // namespace zen