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//! Display a border around another view

use euclid::{Rect, Size2D};

use crate::{event::Event, unit::Cell, Printer, View as ViewTrait};

/// The view itself
pub struct View<V> {
    inner: V,
    top_left: char,
    top_right: char,
    bottom_left: char,
    bottom_right: char,
    v_line: char,
    h_line: char,
}

impl<V> View<V> {
    /// Creates a new bordered view
    ///
    /// The default uses boxdrawing characters for edges and corners.
    pub fn new(view: V) -> Self {
        Self {
            inner: view,
            top_left: '┌',
            top_right: '┐',
            bottom_left: '└',
            bottom_right: '┘',
            v_line: '│',
            h_line: '─',
        }
    }
}

/// Shorthand for [`View::new()`]
///
/// [`View::new()`]: View::new
pub fn new<V>(view: V) -> View<V> {
    View::new(view)
}

impl<T, M, V> ViewTrait<T, M> for View<V>
where
    V: ViewTrait<T, M>,
{
    fn draw(&self, printer: &Printer, focused: bool) {
        let p_size = printer.size();

        let top_left = (0, 0);
        let bottom_left = (0, p_size.height - 1);

        let gen_line = |l: char, c, r| {
            let mut line = l.to_string();

            for _ in 0..(p_size.width - 2) {
                line.push(c);
            }

            line.push(r);

            line
        };

        printer
            .print(
                &gen_line(self.top_left, self.h_line, self.top_right),
                top_left,
            )
            .unwrap();
        printer
            .print(
                &gen_line(self.bottom_left, self.h_line, self.bottom_right),
                bottom_left,
            )
            .unwrap();

        // This should be sufficient for sane things
        let mut buf = [0; 8];
        let v_line = self.v_line.encode_utf8(&mut buf);

        for y in 1..(p_size.height - 1) {
            printer.print(v_line, (0, y)).unwrap();
            printer.print(v_line, (p_size.width - 1, y)).unwrap();
        }

        let sub = printer
            .to_sub_area(Rect::new(
                (1, 1).into(),
                (p_size.width - 2, p_size.height - 2).into(),
            ))
            .unwrap();

        self.inner.draw(&sub, focused);
    }

    fn width(&self) -> Size2D<u16, Cell> {
        let (width, height) = self.inner.width().to_tuple();
        (width.saturating_add(2), height.saturating_add(2)).into()
    }

    fn height(&self) -> Size2D<u16, Cell> {
        let (width, height) = self.inner.height().to_tuple();
        (width.saturating_add(2), height.saturating_add(2)).into()
    }

    fn layout(&self, constraint: Size2D<u16, Cell>) -> Size2D<u16, Cell> {
        let inner = self.inner.layout(
            (
                constraint.width.saturating_sub(2),
                constraint.height.saturating_sub(2),
            )
                .into(),
        );

        (inner.width.saturating_add(2), inner.height.saturating_add(2)).into()
    }

    fn event(
        &mut self,
        event: &Event<T>,
        focused: bool,
    ) -> Box<dyn Iterator<Item = M>> {
        self.inner.event(event, focused)
    }

    fn interactive(&self) -> bool {
        self.inner.interactive()
    }
}

pub trait ViewExt {
    fn border(self) -> View<Self>
    where
        Self: Sized,
    {
        View::new(self)
    }
}

impl<V> ViewExt for V {}