use crate::*;

pub trait TuiStyle {
    fn fg <R: Content<TuiOut>> (color: Color, w: R) -> Foreground<R> {
        Foreground(color, w)
    }
    fn bg <R: Content<TuiOut>> (color: Color, w: R) -> Background<R> {
        Background(color, w)
    }
    fn fg_bg <R: Content<TuiOut>> (fg: Color, bg: Color, w: R) -> Background<Foreground<R>> {
        Background(bg, Foreground(fg, w))
    }
    fn modify <R: Content<TuiOut>> (enable: bool, modifier: Modifier, w: R) -> Modify<R> {
        Modify(enable, modifier, w)
    }
    fn bold <R: Content<TuiOut>> (enable: bool, w: R) -> Modify<R> {
        Self::modify(enable, Modifier::BOLD, w)
    }
    fn border <R: Content<TuiOut>, S: BorderStyle> (enable: bool, style: S, w: R) -> Bordered<S, R> {
        Bordered(enable, style, w)
    }
}

impl TuiStyle for Tui {}

pub struct Foreground<R: Content<TuiOut>>(pub Color, pub R);
impl<R: Content<TuiOut>> Content<TuiOut> for Foreground<R> {
    fn content (&self) -> impl Render<TuiOut> { &self.1 }
    fn render (&self, to: &mut TuiOut) {
        to.fill_fg(to.area(), self.0);
        self.1.render(to)
    }
}

pub struct Background<R: Content<TuiOut>>(pub Color, pub R);
impl<R: Content<TuiOut>> Content<TuiOut> for Background<R> {
    fn content (&self) -> impl Render<TuiOut> { &self.1 }
    fn render (&self, to: &mut TuiOut) {
        to.fill_bg(to.area(), self.0);
        self.1.render(to)
    }
}

pub struct Modify<R: Content<TuiOut>>(pub bool, pub Modifier, pub R);
impl<R: Content<TuiOut>> Content<TuiOut> for Modify<R> {
    fn content (&self) -> impl Render<TuiOut> { &self.2 }
    fn render (&self, to: &mut TuiOut) {
        to.fill_mod(to.area(), self.0, self.1);
        self.2.render(to)
    }
}

pub struct Styled<R: Content<TuiOut>>(pub Option<Style>, pub R);
impl<R: Content<TuiOut>> Content<TuiOut> for Styled<R> {
    fn content (&self) -> impl Render<TuiOut> { &self.1 }
    fn render (&self, to: &mut TuiOut) {
        to.place(self.content().layout(to.area()), &self.content());
        // TODO write style over area
    }
}