pub struct NoteDuration;

/// (pulses, name), assuming 96 PPQ
pub const NOTE_DURATIONS: [(usize, &str);26] = [
    (1,    "1/384"), (2,    "1/192"),
    (3,    "1/128"), (4,    "1/96"),
    (6,    "1/64"),  (8,    "1/48"),
    (12,   "1/32"),  (16,   "1/24"),
    (24,   "1/16"),  (32,   "1/12"),
    (48,   "1/8"),   (64,   "1/6"),
    (96,   "1/4"),   (128,  "1/3"),
    (192,  "1/2"),   (256,  "2/3"),
    (384,  "1/1"),   (512,  "4/3"),
    (576,  "3/2"),   (768,  "2/1"),
    (1152, "3/1"),   (1536, "4/1"),
    (2304, "6/1"),   (3072, "8/1"),
    (3456, "9/1"),   (6144, "16/1"),
];

impl NoteDuration {
    /// Returns the next shorter length
    pub fn prev (pulses: usize) -> usize {
        for (length, _) in NOTE_DURATIONS.iter().rev() { if *length < pulses { return *length } }
        pulses
    }
    /// Returns the next longer length
    pub fn next (pulses: usize) -> usize {
        for (length, _) in NOTE_DURATIONS.iter() { if *length > pulses { return *length } }
        pulses
    }
    pub fn pulses_to_name (pulses: usize) -> &'static str {
        for (length, name) in NOTE_DURATIONS.iter() { if *length == pulses { return name } }
        ""
    }
}