use druid::{
    kurbo::Line,
    widget::{FillStrat, SvgData},
    Color, Data, Rect, RenderContext, Widget,
};

pub struct ToolbarItem {
    icon: SvgData,
}

impl<T: Data> Widget<T> for ToolbarItem {
    fn event(
        &mut self,
        _ctx: &mut druid::EventCtx,
        _event: &druid::Event,
        _data: &mut T,
        _env: &druid::Env,
    ) {
    }

    fn lifecycle(
        &mut self,
        ctx: &mut druid::LifeCycleCtx,
        event: &druid::LifeCycle,
        _data: &T,
        _env: &druid::Env,
    ) {
        if let druid::LifeCycle::HotChanged(true) = event {
            ctx.request_paint();
        }
    }

    fn update(&mut self, _ctx: &mut druid::UpdateCtx, _old_data: &T, _data: &T, _env: &druid::Env) {
    }

    fn layout(
        &mut self,
        _ctx: &mut druid::LayoutCtx,
        bc: &druid::BoxConstraints,
        _data: &T,
        _env: &druid::Env,
    ) -> druid::Size {
        druid::Size::new(bc.max().height * 1.6, bc.max().height)
    }

    fn paint(&mut self, ctx: &mut druid::PaintCtx, _data: &T, _env: &druid::Env) {
        let bg_rect = Rect::ZERO.with_size(ctx.size());
        let icon_rect = Rect::from_center_size(bg_rect.center(), (15.0, 15.0));
        let offset_matrix = FillStrat::default().affine_to_fill(icon_rect.size(), self.icon.size());

        if ctx.is_hot() {
            ctx.fill(bg_rect, &Color::rgba8(50, 50, 50, 255));
            ctx.stroke(
                Line::new(
                    (0.0, bg_rect.height() - 2.0),
                    (bg_rect.width(), bg_rect.height() - 2.0),
                ),
                &Color::rgb8(100, 100, 100),
                2.0,
            );
        }

        ctx.with_child_ctx(icon_rect, |ctx| {
            ctx.transform(druid::Affine::translate((icon_rect.x0, icon_rect.y0)));
            self.icon.to_piet(offset_matrix, ctx);
        });
    }
}