/// Browses for files to load/save.
///
/// ```
/// let browse = tek::Browse::default();
/// ```
#[derive(Debug, Clone, Default, PartialEq)] pub struct Browse {
    pub cwd:    PathBuf,
    pub dirs:   Vec<(OsString, String)>,
    pub files:  Vec<(OsString, String)>,
    pub filter: String,
    pub index:  usize,
    pub scroll: usize,
    pub size:   Measure<Tui>,
}

pub(crate) struct EntriesIterator<'a> {
    pub browser: &'a Browse,
    pub offset:  usize,
    pub length:  usize,
    pub index:   usize,
}

#[derive(Clone, Debug)] pub enum BrowseTarget {
    SaveProject,
    LoadProject,
    ImportSample(Arc<RwLock<Option<Sample>>>),
    ExportSample(Arc<RwLock<Option<Sample>>>),
    ImportClip(Arc<RwLock<Option<MidiClip>>>),
    ExportClip(Arc<RwLock<Option<MidiClip>>>),
}

/// A clip pool.
///
/// ```
/// let pool = tek::Pool::default();
/// ```
#[derive(Debug)] pub struct Pool {
    pub visible: bool,
    /// Selected clip
    pub clip: AtomicUsize,
    /// Mode switch
    pub mode: Option<PoolMode>,
    /// Embedded file browse
    #[cfg(feature = "browse")]  pub browse:  Option<Browse>,
    /// Collection of MIDI clips.
    #[cfg(feature = "clip")]    pub clips:   Arc<RwLock<Vec<Arc<RwLock<MidiClip>>>>>,
    /// Collection of sound samples.
    #[cfg(feature = "sampler")] pub samples: Arc<RwLock<Vec<Arc<RwLock<Sample>>>>>,
}

/// Displays and edits clip length.
#[derive(Clone, Debug, Default)] pub struct ClipLength {
    /// Pulses per beat (quaver)
    pub ppq: usize,
    /// Beats per bar
    pub bpb: usize,
    /// Length of clip in pulses
    pub pulses: usize,
    /// Selected subdivision
    pub focus: Option<ClipLengthFocus>,
}

/// Some sort of wrapper again?
pub struct PoolView<'a>(pub &'a Pool);

// Commands supported by [Browse]
//#[derive(Debug, Clone, PartialEq)]
//pub enum BrowseCommand {
    //Begin,
    //Cancel,
    //Confirm,
    //Select(usize),
    //Chdir(PathBuf),
    //Filter(Arc<str>),
//}

/// Modes for clip pool
#[derive(Debug, Clone)] pub enum PoolMode {
    /// Renaming a pattern
    Rename(usize, Arc<str>),
    /// Editing the length of a pattern
    Length(usize, usize, ClipLengthFocus),
    /// Load clip from disk
    Import(usize, Browse),
    /// Save clip to disk
    Export(usize, Browse),
}

/// Focused field of `ClipLength`
#[derive(Copy, Clone, Debug)] pub enum ClipLengthFocus {
    /// Editing the number of bars
    Bar,
    /// Editing the number of beats
    Beat,
    /// Editing the number of ticks
    Tick,
}