using System;
using System.Collections.Generic;

namespace Skafinity;

// Patch — the subtractive voice definition every pitched note is rendered through:
// unison oscillators → optional high-pass → resonant low-pass with a cutoff envelope.
//
// Part of the MusicGen engine — see MusicGen.cs.

// ── Synth core: unison osc → optional high-pass → resonant low-pass (cutoff
//    envelope) → soft drive → AD/sustain amp env. ──
struct Patch
{
	public int Osc;        // 0 sine 1 saw 2 square 3 triangle
	public int Voices;
	public float Detune;   // cents
	public float Amp;
	public float Attack;   // sec
	public double Decay;   // sec (exp time constant)
	public float Sustain;  // 0..1 (only if Sustained)
	public bool Sustained;
	public float Cutoff;   // Hz low-pass
	public float CutEnv;   // Hz added at attack, decays with Decay
	public float Reso;     // SVF damping (lower = more resonance)
	public float Highpass; // Hz one-pole high-pass (0 = off)
	public float Drive;    // tanh
	public float Pan;      // -1..1
	public float Vibrato;  // Hz (rate of the pitch wobble)
	public float Breath;   // 0..1 noise mix (reeds)
	// ── Expression (per-note pitch shaping; see Expression/Voicing) ──
	public float VibDepth;   // vibrato depth as a pitch fraction (0 → legacy 0.005 when Vibrato>0)
	public float BendSemis;  // pitch offset in semitones at note START, glides to 0 (bend-in / glide); −ve starts below
	public float BendTime;   // 0..1 fraction of the note over which BendSemis glides to 0
	public float ScoopSemis; // height (semitones) of a mid-note bend-up-and-back hump (0 = none)
	// THE BEND — the one a listener would name as one, and the only gesture here that moves the
	// note AWAY from its pitch rather than easing onto it. Everything above is an approach: it
	// starts off-pitch and resolves. This starts ON pitch, pushes up by BendUpSemis, and stays
	// there — or comes back, if BendUpHold says how long to sit at the top first. All three times
	// are SECONDS, never a fraction of the note, so a bend is the same physical gesture whatever
	// the tempo and whatever the note length.
	public float BendUpSemis; // semitones bent UP part way through the note (0 = none)
	public float BendUpStart; // seconds into the note where the bend begins
	public float BendUpTime;  // seconds the bend takes to reach pitch (and to come back down)
	public float BendUpHold;  // seconds held at pitch before releasing; 0 = held to the end
	public float PhaseSeed;  // oscillator start phase (0..1); 0 = legacy in-phase start. Used to
	                         // decorrelate the two double-tracking takes (see RenderPatch).
}

public sealed partial class MusicGen
{
}