/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            audiocacheeventhandler.h
 *
 *  Sun Jan  3 19:57:55 CET 2016
 *  Copyright 2016 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  DrumGizmo 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#pragma once

#include <list>
#include <mutex>
#include <atomic>

#include "thread.h"
#include "sem.h"

#include "audiocachefile.h"
#include "audiocacheidmanager.h"

class CacheEvent;

class AudioCacheEventHandler
	: protected Thread
{
public:
	AudioCacheEventHandler(AudioCacheIDManager& id_manager);
	~AudioCacheEventHandler();

	//! Start event handler thread.
	//! This method blocks until the thread has actually been started.
	void start();

	//! Stop event handler thread.
	//! This method blocks until the thread has actually been stopped.
	void stop();

	//! Set thread status and start/stop thread accordingly.
	//! \param threaded Set to true to start thread or false to stop it.
	void setThreaded(bool threaded);

	//! Get current threaded status.
	bool isThreaded() const;

	//! Lock thread mutex.
	//! This methods are supplied to make this class lockable by std::lock_guard
	void lock();

	//! Unlock thread mutex.
	//! This methods are supplied to make this class lockable by std::lock_guard
	void unlock();

	void pushLoadNextEvent(AudioCacheFile* afile, size_t channel,
	                       size_t pos, sample_t* buffer,
	                       volatile bool* ready);
	void pushCloseEvent(cacheid_t id);

	void setChunkSize(size_t chunksize);
	size_t getChunkSize() const;

	AudioCacheFile& openFile(const std::string& filename);

protected:
	void clearEvents();

	void handleLoadNextEvent(CacheEvent& cache_event);

	//! Lock the mutex and calls handleCloseCache
	void handleCloseEvent(CacheEvent& cache_event);

	//! Close decrease the file ref and release the cache id.
	void handleCloseCache(cacheid_t id);

	void handleEvent(CacheEvent& cache_event);

	// From Thread
	void thread_main() override;

	void pushEvent(CacheEvent& cache_event);

	AudioCacheFiles files;

	std::mutex mutex;

	std::list<CacheEvent> eventqueue;

	std::atomic<bool> threaded{false};
	Semaphore sem;
	Semaphore sem_run;
	bool running{false};

	AudioCacheIDManager& id_manager;

	size_t chunksize{1024};
};