use crate::*;
impl Arranger {
    pub fn scene_add (&mut self, name: Option<&str>, color: Option<ItemPalette>)
        -> Usually<&mut ArrangerScene>
    {
        let name = name.map_or_else(||self.scene_default_name(), |x|x.to_string());
        let scene = ArrangerScene {
            name:  Arc::new(name.into()),
            clips: vec![None;self.tracks.len()],
            color: color.unwrap_or_else(ItemPalette::random),
        };
        self.scenes.push(scene);
        let index = self.scenes.len() - 1;
        Ok(&mut self.scenes[index])
    }
    pub fn scene_del (&mut self, index: usize) {
        todo!("delete scene");
    }
    fn scene_default_name (&self) -> String {
        format!("S{:3>}", self.scenes.len() + 1)
    }
    pub fn selected_scene (&self) -> Option<&ArrangerScene> {
        self.selected.scene().and_then(|s|self.scenes.get(s))
    }
    pub fn selected_scene_mut (&mut self) -> Option<&mut ArrangerScene> {
        self.selected.scene().and_then(|s|self.scenes.get_mut(s))
    }
}
#[derive(Default, Debug, Clone)] pub struct ArrangerScene {
    /// Name of scene
    pub(crate) name:  Arc<RwLock<String>>,
    /// Clips in scene, one per track
    pub(crate) clips: Vec<Option<Arc<RwLock<MidiClip>>>>,
    /// Identifying color of scene
    pub(crate) color: ItemPalette,
}
impl ArrangerScene {
    pub fn name (&self) -> &Arc<RwLock<String>> {
        &self.name
    }
    pub fn clips (&self) -> &Vec<Option<Arc<RwLock<MidiClip>>>> {
        &self.clips
    }
    pub fn color (&self) -> ItemPalette {
        self.color
    }
    pub fn longest_name (scenes: &[Self]) -> usize {
        scenes.iter().map(|s|s.name().read().unwrap().len()).fold(0, usize::max)
    }
    /// Returns the pulse length of the longest phrase in the scene
    pub fn pulses (&self) -> usize {
        self.clips().iter().fold(0, |a, p|{
            a.max(p.as_ref().map(|q|q.read().unwrap().length).unwrap_or(0))
        })
    }
    /// Returns true if all phrases in the scene are
    /// currently playing on the given collection of tracks.
    pub fn is_playing (&self, tracks: &[ArrangerTrack]) -> bool {
        self.clips().iter().any(|clip|clip.is_some()) && self.clips().iter().enumerate()
            .all(|(track_index, clip)|match clip {
                Some(clip) => tracks
                    .get(track_index)
                    .map(|track|{
                        if let Some((_, Some(phrase))) = track.player().play_phrase() {
                            *phrase.read().unwrap() == *clip.read().unwrap()
                        } else {
                            false
                        }
                    })
                    .unwrap_or(false),
                None => true
            })
    }
    pub fn clip (&self, index: usize) -> Option<&Arc<RwLock<MidiClip>>> {
        match self.clips().get(index) { Some(Some(clip)) => Some(clip), _ => None }
    }
}