use crate::anim::Animation;
use crate::draw::DrawContext;
use crate::{Color, CursorEventKind, Vec2};

pub trait Widget {
    fn update(&mut self, dt: f32);
    fn draw(&mut self, ctx: &DrawContext);
    fn on_cursor_event(&mut self, kind: CursorEventKind, at: Vec2);
}

pub struct RoundButton {
    pub pos: Vec2,
    pub radius: f32,
    pub spacing: f32,
    pub thickness: f32,
    pub shrink_anim: Animation,
}

impl Default for RoundButton {
    fn default() -> Self {
        Self {
            pos: Default::default(),
            radius: 0.3,
            spacing: 0.01,
            thickness: 0.01,
            shrink_anim: Animation::new(1.0),
        }
    }
}

impl Widget for RoundButton {
    fn update(&mut self, dt: f32) {
        self.shrink_anim.update(dt);
    }

    fn draw(&mut self, ctx: &DrawContext) {
        let color = Color {
            r: 1.0,
            g: 0.0,
            b: 1.0,
            a: 1.0,
        };

        let spacing = self.shrink_anim.get() * self.spacing;
        ctx.draw_circle(&self.pos, self.radius, &color);
        ctx.draw_ring(&self.pos, self.radius + spacing, self.thickness, &color);
    }

    fn on_cursor_event(&mut self, kind: CursorEventKind, at: Vec2) {
        match kind {
            CursorEventKind::Select => if at.distance(self.pos) < self.radius {
                self.shrink_anim.ease_to(Box::new(keyframe::functions::EaseIn), 0.2, 0.0);
            },
            _ => {}
        }
    }
}