/*
** music_timidity_mididevice.cpp
** Provides access to TiMidity as a generic MIDI device.
**
**---------------------------------------------------------------------------
** Copyright 2008 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/

// HEADER FILES ------------------------------------------------------------

#include <stdlib.h>

#include "zmusic/zmusic_internal.h"
#include "mididevice.h"

#ifdef HAVE_ADL
#include "adlmidi.h"

ADLConfig adlConfig;

class ADLMIDIDevice : public SoftSynthMIDIDevice
{
	struct ADL_MIDIPlayer *Renderer;
public:
	ADLMIDIDevice(const ADLConfig *config);
	~ADLMIDIDevice();
	
	int OpenRenderer() override;
	int GetDeviceType() const override { return MDEV_ADL; }

protected:
	
	void HandleEvent(int status, int parm1, int parm2) override;
	void HandleLongEvent(const uint8_t *data, int len) override;
	void ComputeOutput(float *buffer, int len) override;
	
private:
	int LoadCustomBank(const ADLConfig *config);
};


enum
{
	ME_NOTEOFF = 0x80,
	ME_NOTEON = 0x90,
	ME_KEYPRESSURE = 0xA0,
	ME_CONTROLCHANGE = 0xB0,
	ME_PROGRAM = 0xC0,
	ME_CHANNELPRESSURE = 0xD0,
	ME_PITCHWHEEL = 0xE0
};

//==========================================================================
//
// ADLMIDIDevice Constructor
//
//==========================================================================

ADLMIDIDevice::ADLMIDIDevice(const ADLConfig *config)
	:SoftSynthMIDIDevice(44100)
{
	Renderer = adl_init(44100);	// todo: make it configurable
	if (Renderer != nullptr)
	{
		adl_switchEmulator(Renderer, config->adl_emulator_id);
		adl_setRunAtPcmRate(Renderer, config->adl_run_at_pcm_rate);
		if (!LoadCustomBank(config))
			adl_setBank(Renderer, config->adl_bank);
		adl_setNumChips(Renderer, config->adl_chips_count);
		adl_setVolumeRangeModel(Renderer, config->adl_volume_model);
		adl_setSoftPanEnabled(Renderer, config->adl_fullpan);
	}
	else throw std::runtime_error("Failed to create ADL MIDI renderer.");
}

//==========================================================================
//
// ADLMIDIDevice Destructor
//
//==========================================================================

ADLMIDIDevice::~ADLMIDIDevice()
{
	Close();
	if (Renderer != nullptr)
	{
		adl_close(Renderer);
	}
}

//==========================================================================
//
// ADLMIDIDevice :: LoadCustomBank
//
// Loads a custom WOPL bank for libADLMIDI. Returns 1 when bank has been
// loaded, otherwise, returns 0 when custom banks are disabled or failed
//
//==========================================================================

int ADLMIDIDevice::LoadCustomBank(const ADLConfig *config)
{
	const char *bankfile = config->adl_custom_bank.c_str();
	if(!config->adl_use_custom_bank)
		return 0;
	if(!*bankfile)
		return 0;
	return (adl_openBankFile(Renderer, bankfile) == 0);
}


//==========================================================================
//
// ADLMIDIDevice :: Open
//
// Returns 0 on success.
//
//==========================================================================

int ADLMIDIDevice::OpenRenderer()
{
	adl_rt_resetState(Renderer);
	return 0;
}

//==========================================================================
//
// ADLMIDIDevice :: HandleEvent
//
//==========================================================================

void ADLMIDIDevice::HandleEvent(int status, int parm1, int parm2)
{
	int command = status & 0xF0;
	int chan	= status & 0x0F;

	switch (command)
	{
	case ME_NOTEON:
		adl_rt_noteOn(Renderer, chan, parm1, parm2);
		break;

	case ME_NOTEOFF:
		adl_rt_noteOff(Renderer, chan, parm1);
		break;

	case ME_KEYPRESSURE:
		adl_rt_noteAfterTouch(Renderer, chan, parm1, parm2);
		break;

	case ME_CONTROLCHANGE:
		adl_rt_controllerChange(Renderer, chan, parm1, parm2);
		break;

	case ME_PROGRAM:
		adl_rt_patchChange(Renderer, chan, parm1);
		break;

	case ME_CHANNELPRESSURE:
		adl_rt_channelAfterTouch(Renderer, chan, parm1);
		break;

	case ME_PITCHWHEEL:
		adl_rt_pitchBendML(Renderer, chan, parm2, parm1);
		break;
	}
}

//==========================================================================
//
// ADLMIDIDevice :: HandleLongEvent
//
//==========================================================================

void ADLMIDIDevice::HandleLongEvent(const uint8_t *data, int len)
{
	adl_rt_systemExclusive(Renderer, data, len);
}

static const ADLMIDI_AudioFormat audio_output_format =
{
	ADLMIDI_SampleType_F32,
	sizeof(float),
	2 * sizeof(float)
};

//==========================================================================
//
// ADLMIDIDevice :: ComputeOutput
//
//==========================================================================

void ADLMIDIDevice::ComputeOutput(float *buffer, int len)
{
	ADL_UInt8* left = reinterpret_cast<ADL_UInt8*>(buffer);
	ADL_UInt8* right = reinterpret_cast<ADL_UInt8*>(buffer + 1);
	auto result = adl_generateFormat(Renderer, len * 2, left, right, &audio_output_format);
	for(int i=0; i < result; i++)
	{
		buffer[i] *= 3.5f;
	}
}

//==========================================================================
//
//
//
//==========================================================================

extern ADLConfig adlConfig;

MIDIDevice *CreateADLMIDIDevice(const char *Args)
{
	ADLConfig config = adlConfig;

	const char* bank = Args && *Args ? Args : adlConfig.adl_use_custom_bank ? adlConfig.adl_custom_bank.c_str() : nullptr;
	if (bank && *bank)
	{
		if (*bank >= '0' && *bank <= '9')
		{
			// Args specify a bank by index.
			config.adl_bank = (int)strtoll(bank, nullptr, 10);
			config.adl_use_custom_bank = false;
		}
		else
		{
			const char* info;
			if (musicCallbacks.PathForSoundfont)
			{
				info = musicCallbacks.PathForSoundfont(bank, SF_WOPL);
			}
			else
			{
				info = bank;
			}
			if (info == nullptr)
			{
				config.adl_custom_bank = "";
				config.adl_use_custom_bank = false;
			}
			else
			{
				config.adl_custom_bank = info;
				config.adl_use_custom_bank = true;
			}
		}
	}
	return new ADLMIDIDevice(&config);
}

DLL_EXPORT int ZMusic_GetADLBanks(const char* const** pNames)
{
	if (pNames) *pNames = adl_getBankNames();
	return adl_getBanksCount();
}

#else
MIDIDevice* CreateADLMIDIDevice(const char* Args)
{
	throw std::runtime_error("ADL device not supported in this configuration");
}

DLL_EXPORT int ZMusic_GetADLBanks(const char* const** pNames)
{
	// The export needs to be there even if non-functional.
	return 0;
}

#endif