use crate::*;

pub struct AppContainer<T, E, C, U, A, S>
where
    T: Send + Sync,
    E: Engine,
    C: Command<T>,
    U: From<Arc<RwLock<T>>> + Widget<Engine = E> + Handle<E>,
    A: From<Arc<RwLock<T>>> + Audio,
    S: From<Arc<RwLock<T>>> + StatusBar<E>
{
    pub cursor:     (usize, usize),
    pub entered:    bool,
    pub menu_bar:   Option<MenuBar<E, T, C>>,
    pub status_bar: Option<S>,
    pub history:    Vec<C>,
    pub size:       Measure<E>,
    pub ui:         U,
    pub audio:      A,
    pub model:      Arc<RwLock<T>>,
}

impl<T, E, C, U, A, S> From<T> for AppContainer<T, E, C, U, A, S>
where
    T: Send + Sync,
    E: Engine,
    C: Command<T>,
    U: From<Arc<RwLock<T>>> + Widget<Engine = E> + Handle<E>,
    A: From<Arc<RwLock<T>>> + Audio,
    S: From<Arc<RwLock<T>>> + StatusBar<E>
{
    fn from (model: T) -> Self {
        let model = Arc::new(RwLock::new(model));
        Self {
            cursor:     (0, 0),
            entered:    false,
            menu_bar:   None,
            status_bar: None,
            history:    vec![],
            size:       Measure::new(),
            ui:         U::from(model.clone()),
            audio:      A::from(model.clone()),
            model,
        }
    }
}

impl<T, C, U, A, S> Content for AppContainer<T, Tui, C, U, A, S>
where
    T: Send + Sync,
    C: Command<T>,
    U: From<Arc<RwLock<T>>> + Widget<Engine = Tui> + Handle<Tui>,
    A: From<Arc<RwLock<T>>> + Audio,
    S: From<Arc<RwLock<T>>> + StatusBar<Tui>
{
    type Engine = Tui;
    fn content (&self) -> impl Widget<Engine = Tui> {
        let menus = self.menu_bar.as_ref().map_or_else(
            ||&[] as &[Menu<_, _, _>],
            |m|m.menus.as_slice()
        );
        Split::down(
            if self.menu_bar.is_some() { 1 } else { 0 },
            row!(menu in menus.iter() => {
                row!(" ", menu.title.as_str(), " ")
            }),
            Split::up(
                if self.status_bar.is_some() { 1 } else { 0 },
                widget(&self.status_bar),
                widget(&self.ui)
            )
        )
    }
}