use crate::*;
impl Handle<Tui> for Plugin<Tui> {
    fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
        match from.event() {
            key!(KeyCode::Up) => {
                self.selected = self.selected.saturating_sub(1);
                Ok(Some(true))
            },
            key!(KeyCode::Down) => {
                self.selected = (self.selected + 1).min(match &self.plugin {
                    Some(PluginKind::LV2(LV2Plugin { port_list, .. })) => port_list.len() - 1,
                    _ => unimplemented!()
                });
                Ok(Some(true))
            },
            key!(KeyCode::PageUp) => {
                self.selected = self.selected.saturating_sub(8);
                Ok(Some(true))
            },
            key!(KeyCode::PageDown) => {
                self.selected = (self.selected + 10).min(match &self.plugin {
                    Some(PluginKind::LV2(LV2Plugin { port_list, .. })) => port_list.len() - 1,
                    _ => unimplemented!()
                });
                Ok(Some(true))
            },
            key!(KeyCode::Char(',')) => {
                match self.plugin.as_mut() {
                    Some(PluginKind::LV2(LV2Plugin { port_list, ref mut instance, .. })) => {
                        let index = port_list[self.selected].index;
                        if let Some(value) = instance.control_input(index) {
                            instance.set_control_input(index, value - 0.01);
                        }
                    },
                    _ => {}
                }
                Ok(Some(true))
            },
            key!(KeyCode::Char('.')) => {
                match self.plugin.as_mut() {
                    Some(PluginKind::LV2(LV2Plugin { port_list, ref mut instance, .. })) => {
                        let index = port_list[self.selected].index;
                        if let Some(value) = instance.control_input(index) {
                            instance.set_control_input(index, value + 0.01);
                        }
                    },
                    _ => {}
                }
                Ok(Some(true))
            },
            key!(KeyCode::Char('g')) => {
                match self.plugin {
                    Some(PluginKind::LV2(ref mut plugin)) => {
                        plugin.ui_thread = Some(run_lv2_ui(LV2PluginUI::new()?)?);
                    },
                    Some(_) => unreachable!(),
                    None => {}
                }
                Ok(Some(true))
            },
            _ => Ok(None)
        }
    }
}