#include "SamplePatternInstance.h"

#include "SamplePattern.h"
#include "Singleton/MidiSequencer.h"
#include "PluginHost/Sampler.h"

FSamplePatternInstance::FSamplePatternInstance(FSamplePattern* InOwner, int32 TrackIndex, AudioFrame InSamplePos,
                                               TRange<AudioFrame> InSampleRange) : FPatternInstance(InOwner, TrackIndex, InSamplePos, InSampleRange)
{
}

void FSamplePatternInstance::Process(AudioFrame InFramePos, AudioFrame FrameNum)
{
	const FSamplePattern* SamplePattern = GetInstanceOwner();
	FSampler* Sampler = SamplePattern->GetSampler();

	const AudioFrame EndSamplePos = InFramePos + FrameNum;
	if (EndSamplePos < Pos || InFramePos > Pos + TimeRange.Size<AudioFrame>())
		return;
	
	int64 PatternPos = (int64)InFramePos - Pos;
	int64 PatternEnd = PatternPos + FrameNum;
	if (PatternPos < 0)
	{
		PatternPos = 0;
	}
	
	PatternEnd = FMath::Min<uint64>(PatternEnd, TimeRange.GetUpperBoundValue());
	
	Sampler->IncomingOffset = FMath::Min<int32>(0, InFramePos - Pos) * -1;
	Sampler->IncomingRange.SetLowerBoundValue(PatternPos + TimeRange.GetLowerBoundValue());
	Sampler->IncomingRange.SetUpperBoundValue(PatternEnd + TimeRange.GetLowerBoundValue());
}