/*
	This file is part of EqualizerAPO, a system-wide equalizer.
	Copyright (C) 2014  Jonas Thedering

	This program 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 2 of the License, or
	(at your option) any later version.

	This program 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 this program; if not, write to the Free Software Foundation, Inc.,
	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once

#include <string>
#include <vector>
#include <unordered_set>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mpParser.h>

#include "IFilterFactory.h"
#include "FilterConfiguration.h"
#include "helpers/PrecisionTimer.h"
#include "helpers/MemoryHelper.h"

#pragma AVRT_VTABLES_BEGIN
class FilterEngine
{
public:
	FilterEngine();
	~FilterEngine();

	void setPreMix(bool preMix);
	void setDeviceInfo(bool capture, bool postMixInstalled, const std::wstring& deviceName, const std::wstring& connectionName, const std::wstring& deviceGuid);
	void initialize(float sampleRate, unsigned inputChannelCount, unsigned realChannelCount, unsigned outputChannelCount, unsigned channelMask, unsigned maxFrameCount);
	void loadConfig();
	void loadConfig(const std::wstring& path);
	void watchRegistryKey(const std::wstring& key);
	void process(float *output, float *input, unsigned frameCount);

	bool isPreMix() const {return preMix;}
	bool isCapture() const {return capture;}
	bool isPostMixInstalled() const {return postMixInstalled;}
	std::wstring getDeviceName() const {return deviceName;}
	std::wstring getConnectionName() const {return connectionName;}
	std::wstring getDeviceGuid() const {return deviceGuid;}
	unsigned getInputChannelCount() const {return inputChannelCount;}
	unsigned getRealChannelCount() const {return realChannelCount;}
	unsigned getOutputChannelCount() const {return outputChannelCount;}
	unsigned getChannelMask() const {return channelMask;}
	float getSampleRate() const {return sampleRate;}
	unsigned getMaxFrameCount() const {return maxFrameCount;}
	mup::ParserX* getParser() {return &parser;}

private:
	void addFilters(std::vector<IFilter*> filters);
	void cleanupConfigurations();
	static unsigned long __stdcall notificationThread(void* parameter);

	std::vector<IFilterFactory*> factories;

	bool preMix;
	bool capture;
	bool postMixInstalled;
	std::wstring deviceName;
	std::wstring connectionName;
	std::wstring deviceGuid;
	std::wstring configPath;
	float sampleRate;
	// number of input channels that originally existed before child APO processing
	unsigned inputChannelCount;
	// number of input channels in process (including channels coming from child APO output)
	unsigned realChannelCount;
	unsigned outputChannelCount;
	unsigned channelMask;
	unsigned maxFrameCount;

	// only used during loading
	std::vector<FilterInfo*> filterInfos;
	std::vector<std::wstring> currentChannelNames;
	std::vector<std::wstring> lastChannelNames;
	std::vector<std::wstring> lastNewChannelNames;
	std::vector<std::wstring> allChannelNames;
	bool lastInPlace;
	mup::ParserX parser;

	FilterConfiguration* currentConfig;
	FilterConfiguration* nextConfig;
	FilterConfiguration* previousConfig;

	unsigned transitionCounter;
	unsigned transitionLength;
	HANDLE loadSemaphore;
	CRITICAL_SECTION loadSection;
	PrecisionTimer timer;
	void* threadHandle;
	void* shutdownEvent;
	std::unordered_set<std::wstring> watchRegistryKeys;
	bool lastInputWasSilent;
};
#pragma AVRT_VTABLES_END
