Lofi_Generator/lib/audio/patterns.ts

import { DrumPattern, ChordProgression } from '@/types/audio';

// Classic boom bap patterns
export const drumPatterns: DrumPattern[] = [
  {
    // Classic boom bap
    kick:    [true,  false, false, false, false, false, false, false, true,  false, true,  false, false, false, false, false],
    snare:   [false, false, false, false, true,  false, false, false, false, false, false, false, true,  false, false, false],
    hihat:   [true,  false, true,  false, true,  false, true,  false, true,  false, true,  false, true,  false, true,  false],
    openhat: [false, false, false, false, false, false, false, true,  false, false, false, false, false, false, false, true],
  },
  {
    // Laid back groove
    kick:    [true,  false, false, false, false, false, true,  false, true,  false, false, false, false, false, false, false],
    snare:   [false, false, false, false, true,  false, false, false, false, false, false, false, true,  false, false, true],
    hihat:   [true,  true,  true,  false, true,  true,  true,  false, true,  true,  true,  false, true,  true,  true,  false],
    openhat: [false, false, false, true,  false, false, false, true,  false, false, false, true,  false, false, false, false],
  },
  {
    // Minimal chill
    kick:    [true,  false, false, false, false, false, false, false, true,  false, false, false, false, false, true,  false],
    snare:   [false, false, false, false, true,  false, false, false, false, false, false, false, true,  false, false, false],
    hihat:   [true,  false, true,  true,  true,  false, true,  true,  true,  false, true,  true,  true,  false, true,  true],
    openhat: [false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true],
  },
  {
    // Jazzy swing
    kick:    [true,  false, false, true,  false, false, true,  false, false, false, true,  false, false, false, false, false],
    snare:   [false, false, false, false, true,  false, false, false, false, true,  false, false, true,  false, false, true],
    hihat:   [true,  false, true,  false, true,  false, true,  false, true,  false, true,  false, true,  false, true,  false],
    openhat: [false, false, false, false, false, true,  false, false, false, false, false, false, false, true,  false, false],
  },
  {
    // Deep pocket
    kick:    [true,  false, false, false, false, false, false, true,  false, false, true,  false, false, false, false, false],
    snare:   [false, false, false, false, true,  false, false, false, false, false, false, false, true,  false, false, false],
    hihat:   [true,  true,  true,  true,  true,  true,  true,  true,  true,  true,  true,  true,  true,  true,  true,  true],
    openhat: [false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, true],
  },
];

// Jazz chord progressions in lofi style
export const chordProgressions: ChordProgression[] = [
  {
    name: 'Classic ii-V-I',
    chords: [
      ['D3', 'F3', 'A3', 'C4'],  // Dm7
      ['G2', 'B2', 'D3', 'F3'],  // G7
      ['C3', 'E3', 'G3', 'B3'],  // Cmaj7
      ['C3', 'E3', 'G3', 'B3'],  // Cmaj7
    ],
    durations: ['2n', '2n', '2n', '2n'],
  },
  {
    name: 'Minor Key Chill',
    chords: [
      ['A2', 'C3', 'E3', 'G3'],  // Am7
      ['D3', 'F3', 'A3', 'C4'],  // Dm7
      ['E2', 'G#2', 'B2', 'D3'], // E7
      ['A2', 'C3', 'E3', 'G3'],  // Am7
    ],
    durations: ['2n', '2n', '2n', '2n'],
  },
  {
    name: 'Neo Soul',
    chords: [
      ['F3', 'A3', 'C4', 'E4'],  // Fmaj7
      ['E3', 'G3', 'B3', 'D4'],  // Em7
      ['D3', 'F3', 'A3', 'C4'],  // Dm7
      ['G2', 'B2', 'D3', 'F3'],  // G7
    ],
    durations: ['2n', '2n', '2n', '2n'],
  },
  {
    name: 'Dreamy',
    chords: [
      ['C3', 'E3', 'G3', 'B3'],  // Cmaj7
      ['A2', 'C3', 'E3', 'G3'],  // Am7
      ['F3', 'A3', 'C4', 'E4'],  // Fmaj7
      ['G2', 'B2', 'D3', 'F3'],  // G7
    ],
    durations: ['2n', '2n', '2n', '2n'],
  },
  {
    name: 'Melancholy',
    chords: [
      ['D3', 'F3', 'A3', 'C4'],  // Dm7
      ['G2', 'Bb2', 'D3', 'F3'], // Gm7
      ['C3', 'Eb3', 'G3', 'Bb3'],// Cm7
      ['F2', 'A2', 'C3', 'Eb3'], // F7
    ],
    durations: ['2n', '2n', '2n', '2n'],
  },
];

export function getRandomPattern(): DrumPattern {
  return drumPatterns[Math.floor(Math.random() * drumPatterns.length)];
}

export function getRandomProgression(): ChordProgression {
  return chordProgressions[Math.floor(Math.random() * chordProgressions.length)];
}

export function generateRandomPattern(): DrumPattern {
  const pattern: DrumPattern = {
    kick: new Array(16).fill(false),
    snare: new Array(16).fill(false),
    hihat: new Array(16).fill(false),
    openhat: new Array(16).fill(false),
  };

  // Kick on 1 and somewhere in second half
  pattern.kick[0] = true;
  pattern.kick[8 + Math.floor(Math.random() * 4)] = true;
  if (Math.random() > 0.5) {
    pattern.kick[6 + Math.floor(Math.random() * 2)] = true;
  }

  // Snare on 2 and 4
  pattern.snare[4] = true;
  pattern.snare[12] = true;
  // Ghost notes
  if (Math.random() > 0.6) {
    pattern.snare[Math.floor(Math.random() * 16)] = true;
  }

  // Hi-hats with variation
  for (let i = 0; i < 16; i++) {
    if (i % 2 === 0) {
      pattern.hihat[i] = Math.random() > 0.1;
    } else {
      pattern.hihat[i] = Math.random() > 0.5;
    }
  }

  // Open hi-hat occasionally
  if (Math.random() > 0.3) {
    pattern.openhat[7] = true;
  }
  if (Math.random() > 0.5) {
    pattern.openhat[15] = true;
  }

  return pattern;
}