package synth

import "github.com/netsynth/netsynth/classify"

const (
	SampleRate       = 44100                              // D-13: CD quality
	WindowMs         = 500                                // matches aggregate.DefaultWindowMs
	SamplesPerWindow = SampleRate * WindowMs / 1000       // 22050
	NumLayers        = 14
	GainPerLayer     = 1.0 / float64(NumLayers)           // D-10: ~0.0714
	WhisperFloor     = 0.03                               // D-08/D-09: 3% of max amplitude
)

// HarmonicDef defines one partial in an additive synthesizer.
type HarmonicDef struct {
	Ratio     int     // harmonic number: 1=fundamental, 2=octave, 3=fifth+octave, etc.
	Amplitude float64 // relative weight
}

// FreqConfig holds synthesis parameters for one traffic class.
type FreqConfig struct {
	BaseHz    float64
	Harmonics []HarmonicDef
	Pan       float64 // [-1, 1]: -1=full left, 0=center, +1=full right
}

// ClassFreqConfigs maps each traffic class to its synthesis parameters.
// Frequencies use musical intervals per D-02/D-03. Harmonics per D-05/D-06.
// Pan positions per D-12.
var ClassFreqConfigs = map[classify.TrafficClass]FreqConfig{
	classify.ClassICMP:     {65.0, []HarmonicDef{{1, 1.0}, {2, 0.4}, {3, 0.15}}, 0.0},
	classify.ClassDNS:      {110.0, []HarmonicDef{{1, 1.0}, {2, 0.5}, {3, 0.25}}, -0.2},
	classify.ClassHTTPS:    {175.0, []HarmonicDef{{1, 1.0}, {2, 0.6}, {3, 0.3}}, 0.2},
	classify.ClassHTTP:     {220.0, []HarmonicDef{{1, 1.0}, {2, 0.5}, {4, 0.2}}, -0.35},
	classify.ClassSSH:      {330.0, []HarmonicDef{{1, 1.0}, {3, 0.6}, {5, 0.3}}, 0.35},
	classify.ClassSMTP:     {440.0, []HarmonicDef{{1, 1.0}, {2, 0.3}, {3, 0.1}}, -0.55},
	classify.ClassNTP:      {520.0, []HarmonicDef{{1, 1.0}, {2, 0.25}}, 0.55},
	classify.ClassDHCP:     {600.0, []HarmonicDef{{1, 1.0}, {2, 0.35}, {3, 0.15}}, -0.75},
	classify.ClassOtherTCP: {700.0, []HarmonicDef{{1, 1.0}, {2, 0.2}}, 0.75},
	classify.ClassOtherUDP: {780.0, []HarmonicDef{{1, 1.0}, {2, 0.2}}, -0.75},
	// D-05: Unknown buckets in 850-1100 Hz dissonant range, detuned intervals
	// D-06: Same dissonant harmonic character {1,1.0},{2,0.8},{3,0.4} for all 4
	classify.ClassUnknown1: {862.0, []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, 0.6},
	classify.ClassUnknown2: {920.0, []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, -0.6},
	classify.ClassUnknown3: {981.0, []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, 0.9},
	classify.ClassUnknown4: {1047.0, []HarmonicDef{{1, 1.0}, {2, 0.8}, {3, 0.4}}, -0.9},
}