use event::{Event, EventResult};
use rect::Rect;
use vec::Vec2;
use view::{View, ViewWrapper};
use Printer;

/// Draws a border around a wrapped view.
#[derive(Debug)]
pub struct Panel<V: View> {
    view: V,
}

impl<V: View> Panel<V> {
    /// Creates a new panel around the given view.
    pub fn new(view: V) -> Self {
        Panel { view }
    }

    inner_getters!(self.view: V);
}

impl<V: View> ViewWrapper for Panel<V> {
    wrap_impl!(self.view: V);

    fn wrap_on_event(&mut self, event: Event) -> EventResult {
        self.view.on_event(event.relativized((1, 1)))
    }

    fn wrap_required_size(&mut self, req: Vec2) -> Vec2 {
        // TODO: make borders conditional?
        let req = req.saturating_sub((2, 2));

        self.view.required_size(req) + (2, 2)
    }

    fn wrap_draw(&self, printer: &Printer) {
        printer.print_box((0, 0), printer.size, true);
        let printer = printer.offset((1, 1)).shrinked((1, 1));
        self.view.draw(&printer);
    }

    fn wrap_layout(&mut self, size: Vec2) {
        self.view.layout(size.saturating_sub((2, 2)));
    }

    fn wrap_important_area(&self, size: Vec2) -> Rect {
        let inner_size = size.saturating_sub((2, 2));
        self.view.important_area(inner_size) + (1, 1)
    }
}