/*
 * AsyncFile.actor.h
 *
 * This source file is part of the FoundationDB open source project
 *
 * Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

// When actually compiled (NO_INTELLISENSE), include the generated version of this file.  In intellisense use the source version.
#if defined(NO_INTELLISENSE) && !defined(WORKLOADS_ASYNCFILE_ACTOR_G_H)
	#define WORKLOADS_ASYNCFILE_ACTOR_G_H
	#include "fdbserver/workloads/AsyncFile.actor.g.h"
#elif !defined(WORKLOADS_ASYNCFILE_ACTOR_H)
	#define WORKLOADS_ASYNCFILE_ACTOR_H

#include "fdbserver/workloads/workloads.h"
#include "fdbrpc/IAsyncFile.h"
#include "flow/actorcompiler.h"  // This must be the last #include.

class RandomByteGenerator{
private:
	char *b1;
	int BUF_SIZE;

public:
	RandomByteGenerator();
	~RandomByteGenerator();
	void writeRandomBytesToBuffer(void *buf, int bytes);
};

struct AsyncFileBuffer : public ReferenceCounted<AsyncFileBuffer>
{
	AsyncFileBuffer(size_t size, bool aligned);
	virtual ~AsyncFileBuffer();

	unsigned char *buffer;
	bool aligned;
};

struct AsyncFileHandle : public ReferenceCounted<AsyncFileHandle>
{
	AsyncFileHandle(Reference<IAsyncFile> file, std::string path, bool temporary);
	virtual ~AsyncFileHandle();

	Reference<IAsyncFile> file;
	std::string path;
	bool temporary;
};

struct AsyncFileWorkload : TestWorkload
{
	static const int _PAGE_SIZE;

	//If true, then the underlying AsyncFile will be assumed to be performing unbuffered IO, which requires special alignments
	bool unbufferedIO;
	bool uncachedIO;
	bool fillRandom;
	bool enabled;
	double testDuration;

	Reference<AsyncFileHandle> fileHandle;
	int64_t fileSize;

	std::string path;

	AsyncFileWorkload(WorkloadContext const&);
	virtual ~AsyncFileWorkload() { }

	//Allocates a buffer of a given size.  If necessary, the buffer will be aligned to 4K
	Reference<AsyncFileBuffer> allocateBuffer(size_t size);

	virtual Future<bool> check(Database const& cx);

	//Opens a file for AsyncFile operations.  If the path is empty, then creates a file and fills it with random data
	ACTOR Future<Void> openFile(AsyncFileWorkload *self, int64_t flags, int64_t mode, uint64_t size, bool fillFile = false)
	{
		state RandomByteGenerator rbg;

		if(self->fileHandle.getPtr() != NULL)
		{
			self->fileHandle->file = Reference<IAsyncFile>(NULL);
			wait(delay(0.1));
		}

		state bool fileCreated = self->path.length() == 0;
		if(fileCreated)
		{
			self->path = "asyncfile." + g_random->randomUniqueID().toString();
			flags &= ~IAsyncFile::OPEN_READONLY;
			flags |= IAsyncFile::OPEN_READWRITE | IAsyncFile::OPEN_CREATE;
		}
		else if(fillFile)
		{
			flags &= ~IAsyncFile::OPEN_READONLY;
			flags |= IAsyncFile::OPEN_READWRITE;
		}

		if(self->unbufferedIO)
			flags |= IAsyncFile::OPEN_UNBUFFERED;
		if(self->uncachedIO)
			flags |= IAsyncFile::OPEN_UNCACHED;

		try
		{
			state Reference<IAsyncFile> file = wait(IAsyncFileSystem::filesystem()->open(self->path, flags, 0666));
			if(self->fileHandle.getPtr() == NULL)
				self->fileHandle = Reference<AsyncFileHandle>(new AsyncFileHandle(file, self->path, fileCreated));
			else
				self->fileHandle->file = file;

			if(fileCreated || fillFile)
			{
				state int64_t oldSize = wait(file->size());
				state int64_t newSize = (size + _PAGE_SIZE - 1) & ~(int64_t(_PAGE_SIZE-1)); // align size up

				if(!fileCreated)
					wait(file->truncate(newSize));

				state int chunkSize = 4<<16;
				state Reference<AsyncFileBuffer> data = self->allocateBuffer(chunkSize);
				state int64_t i;
				state Future<Void> lastWrite = Void();
				for(i = oldSize & ~(chunkSize-1); i < newSize; i += chunkSize){
					if (i>>30 != (i+(chunkSize))>>30) // each GB
						printf("Building test file: %d GB\n", int((i+(chunkSize)) >> 30));
					if (self->fillRandom)
						rbg.writeRandomBytesToBuffer(data->buffer, chunkSize);
					auto w = lastWrite;
					lastWrite = file->write(data->buffer, chunkSize, i);
					wait(w);
				}
				wait(lastWrite);
			}
		}
		catch(Error &error)
		{
			TraceEvent(SevError, "TestFailure").detail("Reason", "Could not open file");
			throw;
		}

		return Void();
	}
};

#include "flow/unactorcompiler.h"
#endif
