use crate::*;

/// Handle top-level events in standalone arranger.
impl Handle<Tui> for Arranger<Tui> {
    fn handle (&mut self, i: &TuiInput) -> Perhaps<bool> {
        if let Some(entered) = self.entered() {
            use ArrangerFocus::*;
            if let Some(true) = match entered {
                Transport    => self.transport.as_mut().map(|t|t.handle(i)).transpose()?.flatten(),
                Arrangement  => self.arrangement.handle(i)?,
                PhrasePool   => self.phrases.write().unwrap().handle(i)?,
                PhraseEditor => self.editor.handle(i)?,
            } {
                return Ok(Some(true))
            }
        }
        Ok(if let Some(command) = ArrangerCommand::input_to_command(self, i) {
            let _undo = command.execute(self)?;
            Some(true)
        } else {
            None
        })
    }
}

impl InputToCommand<Tui, Arranger<Tui>> for ArrangerCommand {
    fn input_to_command (state: &Arranger<Tui>, input: &TuiInput) -> Option<Self> {
        use FocusCommand::*;
        use ArrangerCommand::*;
        match input.event() {
            key!(KeyCode::Tab)           => Some(Focus(Next)),
            key!(Shift-KeyCode::Tab)     => Some(Focus(Prev)),
            key!(KeyCode::BackTab)       => Some(Focus(Prev)),
            key!(Shift-KeyCode::BackTab) => Some(Focus(Prev)),
            key!(KeyCode::Up)            => Some(Focus(Up)),
            key!(KeyCode::Down)          => Some(Focus(Down)),
            key!(KeyCode::Left)          => Some(Focus(Left)),
            key!(KeyCode::Right)         => Some(Focus(Right)),
            key!(KeyCode::Enter)         => Some(Focus(Enter)),
            key!(KeyCode::Esc)           => Some(Focus(Exit)),
            key!(KeyCode::Char(' '))     => Some(Transport(TransportCommand::PlayToggle)),
            _ => match state.focused() {
                ArrangerFocus::Transport => state.transport.as_ref()
                    .map(|t|TransportCommand::input_to_command(&*t.read().unwrap(), input)
                        .map(Transport))
                    .flatten(),
                ArrangerFocus::PhrasePool => {
                    let phrases = state.phrases.read().unwrap();
                    match input.event() {
                        key!(KeyCode::Char('e')) => Some(EditPhrase(Some(phrases.phrase().clone()))),
                        _ => PhrasePoolCommand::input_to_command(&*phrases, input)
                            .map(Phrases)
                    }
                },
                ArrangerFocus::PhraseEditor =>
                    PhraseEditorCommand::input_to_command(&state.editor, input)
                        .map(Editor),
                ArrangerFocus::Arrangement => match input.event() {
                    key!(KeyCode::Char('e')) => Some(EditPhrase(state.arrangement.phrase())),
                    _ => ArrangementCommand::input_to_command(&state.arrangement, &input)
                        .map(Arrangement)
                }
            }
        }
    }
}

/// Handle events for arrangement.
impl Handle<Tui> for Arrangement<Tui> {
    fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
        Ok(if let Some(command) = ArrangementCommand::input_to_command(self, from) {
            let _undo = command.execute(self)?;
            Some(true)
        } else {
            None
        })
    }
}

impl InputToCommand<Tui, Arrangement<Tui>> for ArrangementCommand {
    fn input_to_command (state: &Arrangement<Tui>, input: &TuiInput) -> Option<Self> {
        use ArrangementCommand::*;
        match input.event() {
            key!(KeyCode::Char('`'))      => Some(ToggleViewMode),
            key!(KeyCode::Delete)         => Some(Delete),
            key!(KeyCode::Enter)          => Some(Activate),
            key!(KeyCode::Char('.'))      => Some(Increment),
            key!(KeyCode::Char(','))      => Some(Decrement),
            key!(KeyCode::Char('+'))      => Some(ZoomIn),
            key!(KeyCode::Char('='))      => Some(ZoomOut),
            key!(KeyCode::Char('_'))      => Some(ZoomOut),
            key!(KeyCode::Char('-'))      => Some(ZoomOut),
            key!(KeyCode::Char('<'))      => Some(MoveBack),
            key!(KeyCode::Char('>'))      => Some(MoveForward),
            key!(KeyCode::Char('c'))      => Some(RandomColor),
            key!(KeyCode::Char('s'))      => Some(Put),
            key!(KeyCode::Char('g'))      => Some(Get),
            key!(KeyCode::Char('e'))      => Some(Edit(state.phrase())),
            key!(Ctrl-KeyCode::Char('a')) => Some(AddScene),
            key!(Ctrl-KeyCode::Char('t')) => Some(AddTrack),
            key!(KeyCode::Char('l'))      => Some(ToggleLoop),
            key!(KeyCode::Up)             => Some(GoUp),
            key!(KeyCode::Down)           => Some(GoDown),
            key!(KeyCode::Left)           => Some(GoLeft),
            key!(KeyCode::Right)          => Some(GoRight),
            _ => None
        }
    }
}

//impl Arranger<Tui> {
    ///// Helper for event passthru to focused component
    //fn handle_focused (&mut self, from: &TuiInput) -> Perhaps<bool> {
        //match self.focused() {
            //ArrangerFocus::Transport    => self.transport.handle(from),
            //ArrangerFocus::PhrasePool   => self.handle_pool(from),
            //ArrangerFocus::PhraseEditor => self.editor.handle(from),
            //ArrangerFocus::Arrangement  => self.handle_arrangement(from)
                //.and_then(|result|{self.show_phrase();Ok(result)}),
        //}
    //}
    ///// Helper for phrase event passthru when phrase pool is focused
    //fn handle_pool (&mut self, from: &TuiInput) -> Perhaps<bool> {
        //match from.event() {
            //key!(KeyCode::Char('<')) => {
                //self.phrases_split = self.phrases_split.saturating_sub(1).max(12);
            //},
            //key!(KeyCode::Char('>')) => {
                //self.phrases_split = self.phrases_split + 1;
            //},
            //_ => return self.phrases.handle(from)
        //}
        //Ok(Some(true))
    //}
    ///// Helper for phrase event passthru when arrangement is focused
    //fn handle_arrangement (&mut self, from: &TuiInput) -> Perhaps<bool> {
        //let mut handle_phrase = ||{
            //let result = self.phrases.handle(from);
            //self.arrangement.phrase_put();
            //result
        //};
        //match from.event() {
            //key!(KeyCode::Char('a')) => return handle_phrase(),
            //key!(KeyCode::Char('i')) => return handle_phrase(),
            //key!(KeyCode::Char('d')) => return handle_phrase(),
            //key!(KeyCode::Char('<')) => if self.arrangement.selected == ArrangementFocus::Mix {
                //self.arrangement_split = self.arrangement_split.saturating_sub(1).max(12);
            //} else {
                //return self.arrangement.handle(from)
            //},
            //key!(KeyCode::Char('>')) => if self.arrangement.selected == ArrangementFocus::Mix {
                //self.arrangement_split = self.arrangement_split + 1;
            //} else {
                //return self.arrangement.handle(from)
            //},
            //_ => return self.arrangement.handle(from)
        //}
        //self.show_phrase();
        //Ok(Some(true))
    //}
//}