Structs
-----------------

pub enum UICommand {
    Enter,
    Back,
    Scroll(i32),
    Quit,
    PitchRange(f64, f64),
    Print(String),
    ForwardStatus(PlayerStatus),
    ForwardLibrary(LibraryResponse)
}

pub enum UIBackCommand {
    ForwardLibraryCommand(LibraryCommand),
    ForwardPlayerCommand(PlayerCommand),
    SetupMIDI(String),
    MIDI(String, [u8;3]),
}

pub enum LibraryCommand {
    GetPlaylist(usize),
    GetTrack(usize),
}

pub enum LibraryResponse {
    Track(Track),
    Playlist(Playlist),
}

pub enum PlayerCommand {
    GetPos,
    Seek(f64),
    SeekS(Duration),
    PlayPause,
    Cue(bool),
    CueMove(bool),
    HotCue(usize,bool),
    Speed(f64),
    SpeedDiff(f64),
    Scratch(f64),
    Open(Track),
}

pub enum PlayerStatus {
    TrackInfo(Option<Track>, Duration, u32), //track, duration, sample_rate
    Pos(Duration, f64),
    Speed(f64),
    Print(String),
}

pub struct Cue {
    pub name: String,
    pub start: usize,
    pub type_: u8,
}

pub struct Track {
    pub id: usize,
    pub path : String,
    pub info : HashMap<String, String>,
    pub bpm : u32,
    pub sample_rate: u32,
    pub cues : Vec<Cue>,
    pub first_beat : usize,
}

pub struct Playlist {
    pub name : String,
    pub sub_playlists : Vec<usize>,
    pub track_keys : Vec<usize>,
    pub parent: Option<usize>,
}

pub struct Library {
    pub tracks : HashMap<usize, Track>,
    pub root_playlist : Option<usize>,
    pub playlists : Vec<Playlist>
}