/**
 * Custom tempo/BPM measure for convert-units
 *
 * Converts between BPM and note durations in milliseconds.
 * Uses a reciprocal relationship where BPM (beats per minute) is the base unit.
 *
 * Formula: milliseconds per beat = 60000 / BPM
 *
 * The to_anchor value represents the conversion factor:
 * - For BPM → time units: multiply by to_anchor to get milliseconds
 * - For time units → BPM: divide by to_anchor to get BPM
 */

export const tempoMeasure = {
  tempo: {
    systems: {
      metric: {
        // BPM as the base unit (1 BPM = 60000 ms per beat)
        'BPM': {
          name: { singular: 'Beat per Minute', plural: 'Beats per Minute' },
          to_anchor: 1
        },

        // Whole note (4 beats) = 240000 / BPM
        'whole': {
          name: { singular: 'Whole Note', plural: 'Whole Notes' },
          to_anchor: 240000
        },

        // Half note (2 beats) = 120000 / BPM
        'half': {
          name: { singular: 'Half Note', plural: 'Half Notes' },
          to_anchor: 120000
        },

        // Quarter note (1 beat) = 60000 / BPM
        'quarter': {
          name: { singular: 'Quarter Note', plural: 'Quarter Notes' },
          to_anchor: 60000
        },

        // Eighth note (0.5 beats) = 30000 / BPM
        'eighth': {
          name: { singular: 'Eighth Note', plural: 'Eighth Notes' },
          to_anchor: 30000
        },

        // Sixteenth note (0.25 beats) = 15000 / BPM
        'sixteenth': {
          name: { singular: 'Sixteenth Note', plural: 'Sixteenth Notes' },
          to_anchor: 15000
        },

        // Thirty-second note (0.125 beats) = 7500 / BPM
        'thirty-second': {
          name: { singular: 'Thirty-Second Note', plural: 'Thirty-Second Notes' },
          to_anchor: 7500
        },

        // Dotted notes (1.5x the duration)
        'dotted-half': {
          name: { singular: 'Dotted Half Note', plural: 'Dotted Half Notes' },
          to_anchor: 180000 // 3 beats
        },

        'dotted-quarter': {
          name: { singular: 'Dotted Quarter Note', plural: 'Dotted Quarter Notes' },
          to_anchor: 90000 // 1.5 beats
        },

        'dotted-eighth': {
          name: { singular: 'Dotted Eighth Note', plural: 'Dotted Eighth Notes' },
          to_anchor: 45000 // 0.75 beats
        },

        'dotted-sixteenth': {
          name: { singular: 'Dotted Sixteenth Note', plural: 'Dotted Sixteenth Notes' },
          to_anchor: 22500 // 0.375 beats
        },

        // Triplet notes (2/3 of the duration)
        'quarter-triplet': {
          name: { singular: 'Quarter Note Triplet', plural: 'Quarter Note Triplets' },
          to_anchor: 40000 // 2/3 beat
        },

        'eighth-triplet': {
          name: { singular: 'Eighth Note Triplet', plural: 'Eighth Note Triplets' },
          to_anchor: 20000 // 1/3 beat
        },

        'sixteenth-triplet': {
          name: { singular: 'Sixteenth Note Triplet', plural: 'Sixteenth Note Triplets' },
          to_anchor: 10000 // 1/6 beat
        },

        // Milliseconds as direct time unit
        'ms': {
          name: { singular: 'Millisecond', plural: 'Milliseconds' },
          to_anchor: 60000 // Same as quarter note
        },

        // Seconds
        's': {
          name: { singular: 'Second', plural: 'Seconds' },
          to_anchor: 60 // 60 seconds per beat at 1 BPM
        },

        // Hertz (beats per second)
        'Hz': {
          name: { singular: 'Hertz', plural: 'Hertz' },
          to_anchor: 1 / 60 // 1 BPM = 1/60 Hz
        }
      }
    }
  }
};