use crate::*;

#[derive(Clone, Debug)]
pub enum ArrangerCommand {
    Clear,
    Export,
    Import,
    StopAll,
    Scene(ArrangerSceneCommand),
    Track(ArrangerTrackCommand),
    Clip(ArrangerClipCommand),
}

pub trait ArrangerApi: HasJack + HasClock {
    fn name (&self) -> &Arc<RwLock<String>>;

    fn tracks (&self) -> &Vec<ArrangerTrack>;
    fn tracks_mut (&mut self) -> &mut Vec<ArrangerTrack>;

    fn scenes (&self) -> &Vec<ArrangerScene>;
    fn scenes_mut (&mut self) -> &mut Vec<ArrangerScene>;

    fn track_default_name (&self) -> String {
        format!("Track {}", self.tracks().len() + 1)
    }
    fn track_add (
        &mut self, name: Option<&str>, color: Option<ItemColor>
    ) -> Usually<&mut ArrangerTrack> {
        let name = name.map_or_else(||self.track_default_name(), |x|x.to_string());
        let track = ArrangerTrack {
            width:  name.len() + 2,
            color:  color.unwrap_or_else(||ItemColor::random()),
            player: MIDIPlayer::new(&self.jack(), &self.clock(), name.as_str())?,
            name:   Arc::new(name.into()),
        };
        self.tracks_mut().push(track);
        let index = self.tracks().len() - 1;
        Ok(&mut self.tracks_mut()[index])
    }
    fn track_del (&mut self, index: usize) {
        self.tracks_mut().remove(index);
        for scene in self.scenes_mut().iter_mut() {
            scene.clips.remove(index);
        }
    }
    fn scene_default_name (&self) -> String {
        format!("Scene {}", self.scenes().len() + 1)
    }
    fn scene_add (
        &mut self, name: Option<&str>, color: Option<ItemColor>
    ) -> 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(||ItemColor::random()),
        };
        self.scenes_mut().push(scene);
        let index = self.scenes().len() - 1;
        Ok(&mut self.scenes_mut()[index])
    }
    fn scene_del (&mut self, index: usize) {
        self.scenes_mut().remove(index);
    }
}

impl Command<ArrangerModel> for ArrangerCommand {
    fn execute (self, state: &mut ArrangerModel) -> Perhaps<Self> {
        match self {
            Self::Scene(command) => { return Ok(command.execute(state)?.map(Self::Scene)) },
            Self::Track(command) => { return Ok(command.execute(state)?.map(Self::Track)) },
            Self::Clip(command)  => { return Ok(command.execute(state)?.map(Self::Clip)) },
            _ => todo!()
        }
        Ok(None)
    }
}

//impl Command<ArrangerModel> for ArrangerSceneCommand {
//}
            //Edit(phrase)   => { state.state.phrase = phrase.clone() },
            //ToggleViewMode => { state.state.mode.to_next(); },
            //Delete         => { state.state.delete(); },
            //Activate       => { state.state.activate(); },
            //ZoomIn         => { state.state.zoom_in(); },
            //ZoomOut        => { state.state.zoom_out(); },
            //MoveBack       => { state.state.move_back(); },
            //MoveForward    => { state.state.move_forward(); },
            //RandomColor    => { state.state.randomize_color(); },
            //Put            => { state.state.phrase_put(); },
            //Get            => { state.state.phrase_get(); },
            //AddScene       => { state.state.scene_add(None, None)?; },
            //AddTrack       => { state.state.track_add(None, None)?; },
            //ToggleLoop     => { state.state.toggle_loop() },
    //pub fn zoom_in (&mut self) {
        //if let ArrangerEditorMode::Vertical(factor) = self.mode {
            //self.mode = ArrangerEditorMode::Vertical(factor + 1)
        //}
    //}
    //pub fn zoom_out (&mut self) {
        //if let ArrangerEditorMode::Vertical(factor) = self.mode {
            //self.mode = ArrangerEditorMode::Vertical(factor.saturating_sub(1))
        //}
    //}
    //pub fn move_back (&mut self) {
        //match self.selected {
            //ArrangerEditorFocus::Scene(s) => {
                //if s > 0 {
                    //self.scenes.swap(s, s - 1);
                    //self.selected = ArrangerEditorFocus::Scene(s - 1);
                //}
            //},
            //ArrangerEditorFocus::Track(t) => {
                //if t > 0 {
                    //self.tracks.swap(t, t - 1);
                    //self.selected = ArrangerEditorFocus::Track(t - 1);
                    //// FIXME: also swap clip order in scenes
                //}
            //},
            //_ => todo!("arrangement: move forward")
        //}
    //}
    //pub fn move_forward (&mut self) {
        //match self.selected {
            //ArrangerEditorFocus::Scene(s) => {
                //if s < self.scenes.len().saturating_sub(1) {
                    //self.scenes.swap(s, s + 1);
                    //self.selected = ArrangerEditorFocus::Scene(s + 1);
                //}
            //},
            //ArrangerEditorFocus::Track(t) => {
                //if t < self.tracks.len().saturating_sub(1) {
                    //self.tracks.swap(t, t + 1);
                    //self.selected = ArrangerEditorFocus::Track(t + 1);
                    //// FIXME: also swap clip order in scenes
                //}
            //},
            //_ => todo!("arrangement: move forward")
        //}
    //}