/*
     File: SynthElement.cpp
 Abstract: SynthElement.h
  Version: 1.2
 
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*/
#include "SynthElement.h"
#include "AUInstrumentBase.h"
#include "AUMIDIDefs.h"

#undef DEBUG_PRINT
#define DEBUG_PRINT 0
#define DEBUG_PRINT_NOTE 0
#define DEBUG_PRINT_RENDER 0

////////////////////////////////////////////////////////////////////////////////////////////////////////////
MidiControls::MidiControls()
{
	Reset();
}

void MidiControls::Reset()
{
	memset(mControls, 0, sizeof(mControls));
	memset(mPolyPressure, 0, sizeof(mPolyPressure));
	mMonoPressure = 0;
	mProgramChange = 0;
	mPitchBend = 0;
	mActiveRPN = 0;
	mActiveNRPN = 0;
	mActiveRPValue = 0;
	mActiveNRPValue = 0;
	mControls[kMidiController_Pan] = 64;
	mControls[kMidiController_Expression] = 127;
	mPitchBendDepth = 24 << 7;
	mFPitchBendDepth = 24.0f;
	mFPitchBend = 0.0f;
}


SynthElement::SynthElement(AUInstrumentBase *audioUnit, UInt32 inElement) 
	: AUElement(audioUnit), mIndex(inElement)
{
}

SynthElement::~SynthElement()
{
}

SynthGroupElement::SynthGroupElement(AUInstrumentBase *audioUnit, UInt32 inElement, MIDIControlHandler *inHandler) 
	: SynthElement(audioUnit, inElement),
	mCurrentAbsoluteFrame(-1),
	mMidiControlHandler(inHandler),
	mSustainIsOn(false), mSostenutoIsOn(false), mOutputBus(0), mGroupID(kUnassignedGroup)
{
	for (UInt32 i=0; i<kNumberOfSoundingNoteStates; ++i)
		mNoteList[i].mState = (SynthNoteState) i;
}

SynthGroupElement::~SynthGroupElement()
{
	delete mMidiControlHandler;
}

void	SynthGroupElement::SetGroupID (MusicDeviceGroupID inGroup)
{
		// can't re-assign a group once its been assigned
	if (mGroupID != kUnassignedGroup) throw static_cast<OSStatus>(kAudioUnitErr_InvalidElement);
	mGroupID = inGroup;
}

void SynthGroupElement::Reset() 
{
#if DEBUG_PRINT
	printf("SynthGroupElement::Reset\n");
#endif
	mMidiControlHandler->Reset();
	for (UInt32 i=0; i<kNumberOfSoundingNoteStates; ++i)
		mNoteList[i].Empty();
}

SynthPartElement::SynthPartElement(AUInstrumentBase *audioUnit, UInt32 inElement) 
	: SynthElement(audioUnit, inElement)
{
}

// Return the SynthNote with the given inNoteID, if found.  If unreleasedOnly is true, only look for
// attacked and sostenutoed notes, otherwise search all states.  Return state of found note via outNoteState.

SynthNote *SynthGroupElement::GetNote(NoteInstanceID inNoteID, bool unreleasedOnly, UInt32 *outNoteState)
{
#if DEBUG_PRINT_RENDER
	printf("SynthGroupElement::GetNote %d, unreleased = %d\n", inNoteID, unreleasedOnly);
#endif
	const UInt32 lastNoteState = unreleasedOnly ? 
									(mSostenutoIsOn ? kNoteState_Sostenutoed : kNoteState_Attacked)
										: kNoteState_Released;
	SynthNote *note = NULL;
	// Search for notes in each successive state
	for (UInt32 noteState = kNoteState_Attacked; noteState <= lastNoteState; ++noteState)
	{
		if (outNoteState) *outNoteState = noteState;	// even if we find nothing
		note = mNoteList[noteState].mHead;
		while (note && note->mNoteID != inNoteID)
		{
#if DEBUG_PRINT_RENDER
			printf("   checking %p id: %d\n", note, note->mNoteID);
#endif
			note = note->mNext;
		}
		if (note)
		{
#if DEBUG_PRINT_RENDER
			printf("  found %p\n", note);
#endif
			break;
		}
	}
	return note;
}

void SynthGroupElement::NoteOn(SynthNote *note,
							   SynthPartElement *part,
							   NoteInstanceID inNoteID,
							   UInt32 inOffsetSampleFrame,
							   const MusicDeviceNoteParams &inParams)
{
#if DEBUG_PRINT_NOTE
	printf("SynthGroupElement::NoteOn %d\n", inNoteID);
#endif
	// TODO: CONSIDER FIXING this to not need to initialize mCurrentAbsoluteFrame to -1.
	UInt64 absoluteFrame = (mCurrentAbsoluteFrame == -1) ? inOffsetSampleFrame : mCurrentAbsoluteFrame + inOffsetSampleFrame;
	if (note->AttackNote(part, this, inNoteID, absoluteFrame, inOffsetSampleFrame, inParams)) {
		mNoteList[kNoteState_Attacked].AddNote(note);
	}
}

void SynthGroupElement::NoteOff(NoteInstanceID inNoteID, UInt32 inFrame)
{	
#if DEBUG_PRINT_NOTE
	printf("SynthGroupElement::NoteOff %d\n", inNoteID);
#endif
	UInt32 noteState = kNoteState_Attacked;
	SynthNote *note = GetNote(inNoteID, true, &noteState);	// asking for unreleased only
	if (note)
	{
#if DEBUG_PRINT_NOTE
		printf("  old note state: %d\n", note->mState);
#endif
		if (noteState == kNoteState_Attacked)
		{
			mNoteList[noteState].RemoveNote(note);
			if (mSustainIsOn) {
				mNoteList[kNoteState_ReleasedButSustained].AddNote(note);
			} else {
				note->Release(inFrame);
				mNoteList[kNoteState_Released].AddNote(note);
			}
#if DEBUG_PRINT_NOTE
			printf("  new note state: %d\n", note->mState);
#endif
		}
		else /* if (noteState == kNoteState_Sostenutoed) */
		{
			mNoteList[kNoteState_Sostenutoed].RemoveNote(note);
			mNoteList[kNoteState_ReleasedButSostenutoed].AddNote(note);
		}
	}
}

void SynthGroupElement::NoteEnded(SynthNote *inNote, UInt32 inFrame)
{
#if DEBUG_PRINT_NOTE
	printf("SynthGroupElement::NoteEnded: id %d state %d\n", inNote->mNoteID, inNote->mState);
#endif
	if (inNote->IsSounding()) {
		SynthNoteList *list = &mNoteList[inNote->GetState()];
		list->RemoveNote(inNote);
	}
	
	GetAUInstrument()->AddFreeNote(inNote);
}

void SynthGroupElement::NoteFastReleased(SynthNote *inNote)
{
#if DEBUG_PRINT_NOTE
	printf("SynthGroupElement::NoteFastReleased id %d state %d\n", inNote->mNoteID, inNote->mState);
#endif
	if (inNote->IsActive()) {
		mNoteList[inNote->GetState()].RemoveNote(inNote);
		GetAUInstrument()->DecNumActiveNotes();
		mNoteList[kNoteState_FastReleased].AddNote(inNote);
	}
	else {
		Assert(true, "ASSERT FAILED:  Attempting to fast-release non-active note");
	}
}

bool SynthGroupElement::ChannelMessage(UInt16 controllerID, UInt16 inValue)
{
	bool handled = true;
#if DEBUG_PRINT
	printf("SynthGroupElement::ChannelMessage(0x%x, %u)\n", controllerID, inValue);
#endif
	// Sustain and sostenuto are "pedal events", and are handled during render cycle
	if (controllerID <= kMidiController_RPN_MSB && controllerID != kMidiController_Sustain && controllerID != kMidiController_Sostenuto)
		handled = mMidiControlHandler->SetController(controllerID, UInt8(inValue));
	else 
	{
		switch (controllerID)
		{
			case kMidiMessage_ProgramChange:
				handled = mMidiControlHandler->SetProgramChange(inValue);
				break;
			case kMidiMessage_PitchWheel:
				handled = mMidiControlHandler->SetPitchWheel(inValue);
				break;
			case kMidiMessage_ChannelPressure:
#if DEBUG_PRINT
				printf("SynthGroupElement::ChannelMessage: Channel Pressure %u\n", inValue);
#endif
				handled = mMidiControlHandler->SetChannelPressure(UInt8(inValue));
				break;
			case kMidiMessage_PolyPressure:
			{	UInt8 inKey = inValue >> 7;
				UInt8 val = inValue & 0xf;
				handled = mMidiControlHandler->SetPolyPressure(inKey, val);
				break;
			}
			default:
				handled = false;
				break;
		}
	}
	return handled;
}

void SynthGroupElement::SostenutoOn(UInt32 inFrame)
{
#if DEBUG_PRINT
	printf("SynthGroupElement::SostenutoOn\n");
#endif
	if (!mSostenutoIsOn) {
		mMidiControlHandler->SetController(kMidiController_Sostenuto, 127);
		mSostenutoIsOn = true;
		mNoteList[kNoteState_Sostenutoed].TransferAllFrom(&mNoteList[kNoteState_Attacked], inFrame);
	}
}

void SynthGroupElement::SostenutoOff(UInt32 inFrame)
{
#if DEBUG_PRINT
	printf("SynthGroupElement::SostenutoOff\n");
#endif
	if (mSostenutoIsOn) {
		mMidiControlHandler->SetController(kMidiController_Sostenuto, 0);
		mSostenutoIsOn = false;
		mNoteList[kNoteState_Attacked].TransferAllFrom(&mNoteList[kNoteState_Sostenutoed], inFrame);
		if (mSustainIsOn) 
			mNoteList[kNoteState_ReleasedButSustained].TransferAllFrom(&mNoteList[kNoteState_ReleasedButSostenutoed], inFrame);
		else
			mNoteList[kNoteState_Released].TransferAllFrom(&mNoteList[kNoteState_ReleasedButSostenutoed], inFrame);
	}
}


void SynthGroupElement::SustainOn(UInt32 inFrame)
{
#if DEBUG_PRINT
//	printf("SynthGroupElement::SustainOn\n");
#endif
	if (!mSustainIsOn) {
		mMidiControlHandler->SetController(kMidiController_Sustain, 127);
		mSustainIsOn = true;
	}
}

void SynthGroupElement::SustainOff(UInt32 inFrame)
{
#if DEBUG_PRINT
//	printf("SynthGroupElement::SustainOff\n");
#endif
	if (mSustainIsOn) {
		mMidiControlHandler->SetController(kMidiController_Sustain, 0);
		mSustainIsOn = false;
	
		mNoteList[kNoteState_Released].TransferAllFrom(&mNoteList[kNoteState_ReleasedButSustained], inFrame);
	}
}

void SynthGroupElement::AllNotesOff(UInt32 inFrame)
{
#if DEBUG_PRINT
	printf("SynthGroupElement::AllNotesOff\n");
#endif
	SynthNote *note;
	for (UInt32 i=0 ; i<=kNoteState_Sostenutoed; ++i)
	{
		UInt32 newState = (i == kNoteState_Attacked) ?
			kNoteState_Released : kNoteState_ReleasedButSostenutoed;
		note = mNoteList[i].mHead;
		while (note)
		{
			SynthNote *nextNote = note->mNext;
			
			mNoteList[i].RemoveNote(note);
			note->Release(inFrame);
			mNoteList[newState].AddNote(note);
			
			note = nextNote;
		}
	}	
}

void SynthGroupElement::AllSoundOff(UInt32 inFrame)
{
#if DEBUG_PRINT
	printf("SynthGroupElement::AllSoundOff\n");
#endif
	SynthNote *note;
	
	for (UInt32 i=0 ; i<kNumberOfActiveNoteStates; ++i)
	{
		note = mNoteList[i].mHead;
		while (note)
		{
			SynthNote *nextNote = note->mNext;
			
			mNoteList[i].RemoveNote(note);
			note->FastRelease(inFrame);
			mNoteList[kNoteState_FastReleased].AddNote(note);
			GetAUInstrument()->DecNumActiveNotes();
			note = nextNote;
		}
	}	
}

void SynthGroupElement::ResetAllControllers(UInt32 inFrame)
{
#if DEBUG_PRINT
	printf("SynthGroupElement::ResetAllControllers\n");
#endif
	mMidiControlHandler->Reset();
}

OSStatus SynthGroupElement::Render(SInt64 inAbsoluteSampleFrame, UInt32 inNumberFrames, AUScope &outputs)
{
	// Avoid duplicate calls at same sample offset
	if (inAbsoluteSampleFrame != mCurrentAbsoluteFrame)
	{
		mCurrentAbsoluteFrame = inAbsoluteSampleFrame;
		AudioBufferList* buffArray[16];
		UInt32 numOutputs = outputs.GetNumberOfElements();
		for (UInt32 outBus = 0; outBus < numOutputs && outBus < 16; ++outBus)
		{
			buffArray[outBus] = &GetAudioUnit()->GetOutput(outBus)->GetBufferList();
		}
		
		for (UInt32 i=0 ; i<kNumberOfSoundingNoteStates; ++i)
		{
			SynthNote *note = mNoteList[i].mHead;
			while (note)
			{
#if DEBUG_PRINT_RENDER
				printf("SynthGroupElement::Render: state %d, note %p\n", i, note);
#endif
				SynthNote *nextNote = note->mNext;
				
				OSStatus err = note->Render(inAbsoluteSampleFrame, inNumberFrames, buffArray, numOutputs);
				if (err) return err;
				
				note = nextNote;
			}
		}
	}
	return noErr;
}


