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

const steel: StringParams = {
  n: 50,
  spacing: 0.0127, // 0.65 m wall to wall
  mass: 5.08e-5, // 4 g/m, like a guitar G string
  k: 3.15e6, // EA / L for steel, 0.5 mm diameter
  tension: 70,
  leftEnd: 'clamped',
  rightEnd: 'clamped',
  pins: '',
  t60Low: 4,
  fLow: 100,
  t60High: 0.6,
  fHigh: 4000,
  excitation: 'pluck',
  excBead: 10,
  excWidth: 1,
  pluckAmp: 0.002,
  strikeVel: 2,
  hammerForce: 20,
  hammerMs: 1,
  excAngle: 0,
  pickupMode: 'bead',
  pickupBead: 4,
  pickupAxis: 'y',
  duration: 2,
  fs: 48000,
  cfl: 0.5,
  frameRate: 2000,
};

export interface Preset {
  name: string;
  description: string;
  params: StringParams;
}

export const PRESETS: Preset[] = [
  {
    name: 'Steel string, plucked',
    description: 'Guitar-like: 50 beads, 0.65 m, 70 N, ~102 Hz. Stiff springs, so longitudinal modes sit near 2.4 kHz.',
    params: steel,
  },
  {
    name: 'Steel string, fretted at the middle',
    description: 'Same string with bead 25 pinned: an octave up, each half rings on its own.',
    params: { ...steel, pins: '25', excBead: 6, pickupBead: 3 },
  },
  {
    name: 'Steel string, hammered',
    description: '1 ms raised-cosine force near one end, like a piano hammer (no hammer felt or contact).',
    params: { ...steel, excitation: 'hammer', excBead: 6, excWidth: 1, hammerForce: 30, hammerMs: 1.5 },
  },
  {
    name: 'Rubber band, big pluck',
    description: 'Soft springs, 100% pre-stretch: transverse and longitudinal speeds are close, so a large pluck glides in pitch and couples the two.',
    params: {
      ...steel,
      n: 30,
      spacing: 0.01,
      mass: 1e-4,
      k: 8000,
      tension: 40,
      pluckAmp: 0.03,
      excBead: 8,
      t60Low: 1.5,
      t60High: 0.3,
    },
  },
  {
    name: 'Three beads',
    description: 'A very coarse string: three modes only, at inharmonic ratios 1 : 1.85 : 2.41.',
    params: {
      ...steel,
      n: 3,
      spacing: 0.1625,
      mass: 0.00065,
      k: 2.5e5,
      excBead: 1,
      pickupBead: 1,
      frameRate: 4000,
    },
  },
  {
    name: 'Whirling string',
    description: 'Plucked at 30 degrees out of plane with sliding ends: watch the y and z views and the pitch of each.',
    params: { ...steel, n: 40, spacing: 0.016, leftEnd: 'clamped', rightEnd: 'sliding', excAngle: 30, pluckAmp: 0.008, mass: 6.4e-5 },
  },
];