import type { DrumParams } from './model';

// Mylar-like head: 0.19 mm film, surface density 0.26 kg/m^2, E t ~ 8.6e5 N/m.
const fast: DrumParams = {
  diameter: 0.3,
  rings: 12,
  density: 0.26,
  tension: 1500, // c = 76 m/s, ideal f01 ~ 194 Hz
  inPlane: 12000, // softened: in-plane waves only ~3x faster than transverse
  t60Low: 1.2,
  fLow: 200,
  t60High: 0.25,
  fHigh: 3000,
  excitation: 'mallet',
  excR: 0.35,
  excAngle: 0,
  excWidth: 0.008,
  malletMass: 0.02,
  malletSpeed: 3,
  feltK: 1e8,
  feltP: 2.5,
  strikeVel: 1,
  forcePeak: 50,
  forceMs: 1,
  pressAmp: 0.003,
  pickupMode: 'sum',
  pickupR: 0.5,
  pickupAngle: 120,
  pickupAxis: 'y',
  duration: 1.5,
  fs: 48000,
  cfl: 0.5,
  frameRate: 2000,
};

export interface DrumPreset {
  name: string;
  description: string;
  params: DrumParams;
}

export const DRUM_PRESETS: DrumPreset[] = [
  {
    name: 'Tom, fast (softened in-plane)',
    description:
      '30 cm head, ~470 beads, 1500 N/m, ideal fundamental ~194 Hz. In-plane springs softened about 70x for speed: small-amplitude pitch is unchanged, but large hits glide and couple more than a real head.',
    params: fast,
  },
  {
    name: 'Tom, realistic Mylar (slow)',
    description:
      'Same head with Mylar-like in-plane stiffness (E·t = 8.6e5 N/m). Accurate in-plane behaviour, about 6x more time steps.',
    params: { ...fast, inPlane: 8.6e5 },
  },
  {
    name: 'Hard hit near the rim',
    description: 'Fast head, light hard mallet at 4 m/s close to the rim: short contact, bright attack, many modes.',
    params: { ...fast, excR: 0.8, malletMass: 0.01, malletSpeed: 4, feltK: 1e9, feltP: 2.8, excWidth: 0.005 },
  },
  {
    name: 'Soft mallet in the centre',
    description: 'Heavy soft mallet at the centre: long contact, mostly the axisymmetric modes, dark sound.',
    params: { ...fast, excR: 0, malletMass: 0.05, malletSpeed: 1.5, feltK: 2e6, feltP: 2.3, excWidth: 0.015 },
  },
  {
    name: 'Small coarse drum',
    description: '6 rings (~130 beads): runs quickly; the coarse lattice is audibly more inharmonic than a real head.',
    params: { ...fast, diameter: 0.2, rings: 6, excWidth: 0.01 },
  },
];