use crate::*;

#[derive(Clone, PartialEq)]
pub enum ArrangerCommand {
    Focus(FocusCommand),
    Transport(TransportCommand),
    Phrases(PhrasePoolCommand),
    Editor(PhraseEditorCommand),
    Arrangement(ArrangementCommand),
    EditPhrase,
}
#[derive(Clone, PartialEq)]
pub enum ArrangementCommand {
    New,
    Load,
    Save,
    ToggleViewMode,
    Delete,
    Activate,
    Increment,
    Decrement,
    ZoomIn,
    ZoomOut,
    MoveBack,
    MoveForward,
    RandomColor,
    Put,
    Get,
    AddScene,
    AddTrack,
    ToggleLoop,
    GoUp,
    GoDown,
    GoLeft,
    GoRight,
    Edit,
}

impl<E: Engine> Command<Arranger<E>> for ArrangerCommand {
    fn execute (self, state: &mut Arranger<E>) -> Perhaps<Self> {
        let undo = match self {
            Self::Focus(cmd) => {
                delegate(cmd, Self::Focus,       state)
            },
            Self::Phrases(cmd) => {
                delegate(cmd, Self::Phrases,     &mut*state.phrases.write().unwrap())
            },
            Self::Editor(cmd) => {
                delegate(cmd, Self::Editor,      &mut state.editor)
            },
            Self::Arrangement(cmd) => {
                delegate(cmd, Self::Arrangement, &mut state.arrangement)
            },
            Self::Transport(cmd) => if let Some(ref transport) = state.transport {
                delegate(cmd, Self::Transport,   &mut*transport.write().unwrap())
            } else {
                Ok(None)
            },
            Self::EditPhrase => if let Some(phrase) = state.arrangement.phrase() {
                state.editor.phrase = Some(phrase.clone());
                state.focus(ArrangerFocus::PhraseEditor);
                state.focus_enter();
                Ok(None)
            } else {
                Ok(None)
            }
        }?;
        state.show_phrase();
        state.update_status();
        return Ok(undo);
    }
}
impl<E: Engine> Command<Arrangement<E>> for ArrangementCommand {
    fn execute (self, state: &mut Arrangement<E>) -> Perhaps<Self> {
        use ArrangementCommand::*;
        match self {
            New  => todo!(),
            Load => todo!(),
            Save => todo!(),
            Edit => todo!(),
            ToggleViewMode => { state.mode.to_next(); },
            Delete         => { state.delete(); },
            Activate       => { state.activate(); },
            Increment      => { state.increment(); },
            Decrement      => { state.decrement(); },
            ZoomIn         => { state.zoom_in(); },
            ZoomOut        => { state.zoom_out(); },
            MoveBack       => { state.move_back(); },
            MoveForward    => { state.move_forward(); },
            RandomColor    => { state.randomize_color(); },
            Put            => { state.phrase_put(); },
            Get            => { state.phrase_get(); },
            AddScene       => { state.scene_add(None, None)?; },
            AddTrack       => { state.track_add(None, None)?; },
            ToggleLoop     => { state.toggle_loop() },
            GoUp           => { state.go_up() },
            GoDown         => { state.go_down() },
            GoLeft         => { state.go_left() },
            GoRight        => { state.go_right() },
        };
        Ok(None)
    }
}