use crate::*;
impl Arranger {
    pub fn track_next_name (&self) -> String {
        format!("T{}", self.tracks.len() + 1)
    }
    pub fn track_add (&mut self, name: Option<&str>, color: Option<ItemPalette>)
        -> Usually<&mut ArrangerTrack>
    {
        let name = name.map_or_else(||self.track_next_name(), |x|x.to_string());
        let track = ArrangerTrack {
            width:  name.len() + 2,
            name:   Arc::new(name.into()),
            color:  color.unwrap_or_else(ItemPalette::random),
            player: MidiPlayer::from(&self.clock),
        };
        self.tracks.push(track);
        let index = self.tracks.len() - 1;
        Ok(&mut self.tracks[index])
    }
    pub fn track_del (&mut self, index: usize) {
        self.tracks.remove(index);
        for scene in self.scenes.iter_mut() {
            scene.clips.remove(index);
        }
    }
}
#[derive(Debug)] pub struct ArrangerTrack {
    /// Name of track
    pub name:   Arc<RwLock<String>>,
    /// Preferred width of track column
    pub width:  usize,
    /// Identifying color of track
    pub color:  ItemPalette,
    /// MIDI player state
    pub player: MidiPlayer,
}
has_clock!(|self:ArrangerTrack|self.player.clock());
has_player!(|self:ArrangerTrack|self.player);
impl ArrangerTrack {
    pub fn widths (tracks: &[Self]) -> Vec<(usize, usize)> {
        let mut widths = vec![];
        let mut total = 0;
        for track in tracks.iter() {
            let width = track.width;
            widths.push((width, total));
            total += width;
        }
        widths.push((0, total));
        widths
    }
    pub fn with_widths (tracks: &[ArrangerTrack])
        -> impl Iterator<Item = (usize, &ArrangerTrack, usize, usize)>
    {
        let mut x = 0;
        tracks.iter().enumerate().map(move |(index, track)|{
            let data = (index, track, x, x + track.width);
            x += track.width;
            data
        })
    }
    /// Name of track
    pub fn name (&self) -> &Arc<RwLock<String>> {
        &self.name
    }
    /// Preferred width of track column
    fn width (&self) -> usize {
        self.width
    }
    /// Preferred width of track column
    fn width_mut (&mut self) -> &mut usize {
        &mut self.width
    }
    /// Identifying color of track
    pub fn color (&self) -> ItemPalette {
        self.color
    }
    fn longest_name (tracks: &[Self]) -> usize {
        tracks.iter().map(|s|s.name().read().unwrap().len()).fold(0, usize::max)
    }
    pub const MIN_WIDTH: usize = 6;
    fn width_inc (&mut self) {
        *self.width_mut() += 1;
    }
    fn width_dec (&mut self) {
        if self.width() > Self::MIN_WIDTH {
            *self.width_mut() -= 1;
        }
    }
}
/// Hosts the JACK callback for a collection of tracks
pub struct TracksAudio<'a>(
    // Track collection
    pub &'a mut [ArrangerTrack],
    /// Note buffer
    pub &'a mut Vec<u8>,
    /// Note chunk buffer
    pub &'a mut Vec<Vec<Vec<u8>>>,
);
impl Audio for TracksAudio<'_> {
    #[inline] fn process (&mut self, client: &Client, scope: &ProcessScope) -> Control {
        let model         = &mut self.0;
        let note_buffer   = &mut self.1;
        let output_buffer = &mut self.2;
        for track in model.iter_mut() {
            if PlayerAudio(track.player_mut(), note_buffer, output_buffer).process(client, scope) == Control::Quit {
                return Control::Quit
            }
        }
        Control::Continue
    }
}