use crate::*;

#[derive(Debug)]
pub struct Arrangement {
    /// JACK client handle (needs to not be dropped for standalone mode to work).
    pub jack:    Arc<RwLock<JackClient>>,
    /// Global timebase
    pub clock:   Arc<Clock>,
    /// Name of arranger
    pub name:    Arc<RwLock<String>>,
    /// Collection of phrases.
    pub phrases: Arc<RwLock<Vec<Phrase>>>,
    /// Collection of tracks.
    pub tracks:  Vec<ArrangementTrack>,
    /// Collection of scenes.
    pub scenes:  Vec<ArrangementScene>,
}

#[derive(Debug)]
pub struct ArrangementTrack {
    /// Name of track
    pub name:   Arc<RwLock<String>>,
    /// Preferred width of track column
    pub width:  usize,
    /// Identifying color of track
    pub color:  ItemColor,
    /// The MIDI player for the track
    pub player: MIDIPlayer
}

#[derive(Default, Debug, Clone)]
pub struct ArrangementScene {
    /// Name of scene
    pub name:  Arc<RwLock<String>>,
    /// Clips in scene, one per track
    pub clips: Vec<Option<Arc<RwLock<Phrase>>>>,
    /// Identifying color of scene
    pub color: ItemColor,
}

impl Audio for Arrangement {
    #[inline] fn process (&mut self, client: &Client, scope: &ProcessScope) -> Control {
        for track in self.tracks.iter_mut() {
            if track.process(client, scope) == Control::Quit {
                return Control::Quit
            }
        }
        Control::Continue
    }
}

impl Audio for ArrangementTrack {
    #[inline] fn process (&mut self, client: &Client, scope: &ProcessScope) -> Control {
        self.player.process(client, scope)
    }
}

impl Arrangement {
    pub fn is_stopped (&self) -> bool {
        *self.clock.playing.read().unwrap() == Some(TransportState::Stopped)
    }
}

impl ArrangementScene {
    /// 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: &[MIDIPlayer]) -> 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.phrase {
                        *phrase.read().unwrap() == *clip.read().unwrap()
                    } else {
                        false
                    })
                    .unwrap_or(false),
                None => true
            })
    }

    pub fn clip (&self, index: usize) -> Option<&Arc<RwLock<Phrase>>> {
        match self.clips.get(index) { Some(Some(clip)) => Some(clip), _ => None }
    }

    //TODO
    //pub fn from_edn <'a, 'e> (args: &[Edn<'e>]) -> Usually<Self> {
        //let mut name  = None;
        //let mut clips = vec![];
        //edn!(edn in args {
            //Edn::Map(map) => {
                //let key = map.get(&Edn::Key(":name"));
                //if let Some(Edn::Str(n)) = key {
                    //name = Some(*n);
                //} else {
                    //panic!("unexpected key in scene '{name:?}': {key:?}")
                //}
            //},
            //Edn::Symbol("_") => {
                //clips.push(None);
            //},
            //Edn::Int(i) => {
                //clips.push(Some(*i as usize));
            //},
            //_ => panic!("unexpected in scene '{name:?}': {edn:?}")
        //});
        //Ok(ArrangementScene {
            //name:  Arc::new(name.unwrap_or("").to_string().into()),
            //color: ItemColor::random(),
            //clips,
        //})
    //}
    pub fn ppqs (scenes: &[Self], factor: usize) -> Vec<(usize, usize)> {
        let mut total = 0;
        if factor == 0 {
            scenes.iter().map(|scene|{
                let pulses = scene.pulses().max(PPQ);
                total = total + pulses;
                (pulses, total - pulses)
            }).collect()
        } else {
            (0..=scenes.len()).map(|i|{
                (factor*PPQ, factor*PPQ*i)
            }).collect()
        }
    }
    pub fn longest_name (scenes: &[Self]) -> usize {
        scenes.iter().map(|s|s.name.read().unwrap().len()).fold(0, usize::max)
    }
}

impl ArrangementTrack {
    pub fn longest_name (tracks: &[Self]) -> usize {
        tracks.iter().map(|s|s.name.read().unwrap().len()).fold(0, usize::max)
    }

    pub const MIN_WIDTH: usize = 3;
    pub fn width_inc (&mut self) {
        self.width += 1;
    }
    pub fn width_dec (&mut self) {
        if self.width > Self::MIN_WIDTH {
            self.width -= 1;
        }
    }
}