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use std::cmp::Ordering;

use macroquad::{
    experimental::{
        collections::storage,
        scene::{Handle, Node, RefMut},
    },
    prelude::*,
};

use crate::{math::Circle, physics::Collider, render::Viewport};

pub enum Bounds {
    Point(Vec2),
    Rectangle(Rect),
    Circle(Circle),
    Collider(Collider),
}

pub trait BufferedDraw: Node {
    fn buffered_draw(&mut self);

    fn get_z_index(&self) -> f32;

    fn get_bounds(&self) -> Bounds;

    fn is_in_frustum(&self, frustum: &Rect) -> bool {
        match self.get_bounds() {
            Bounds::Point(vec) => frustum.contains(vec),
            Bounds::Rectangle(rect) => frustum.overlaps(&rect),
            Bounds::Circle(circle) => circle.overlaps_rect(frustum),
            Bounds::Collider(collider) => collider.overlaps_rect(frustum),
        }
    }
}

pub struct DrawBuffer<T: 'static + BufferedDraw> {
    pub buffered: Vec<Handle<T>>,
}

impl<T: 'static + BufferedDraw> DrawBuffer<T> {
    pub fn new() -> Self {
        Default::default()
    }

    pub fn add_node() -> Handle<Self> {
        scene::add_node(Self::new())
    }
}

impl<T: 'static + BufferedDraw> Node for DrawBuffer<T> {
    fn draw(mut node: RefMut<Self>) {
        node.buffered.sort_by(|a, b| {
            if let Some(a) = scene::try_get_node(*a) {
                if let Some(b) = scene::try_get_node(*b) {
                    return a.get_z_index().partial_cmp(&b.get_z_index()).unwrap();
                }
            }
            Ordering::Equal
        });

        let viewport = storage::get::<Viewport>();
        let frustum = viewport.get_frustum();
        node.buffered.drain_filter(|handle| {
            if let Some(mut buffered) = scene::try_get_node(*handle) {
                if buffered.is_in_frustum(&frustum) {
                    buffered.buffered_draw();
                }
                return false;
            }
            true
        });
    }
}

impl<T: 'static + BufferedDraw> Default for DrawBuffer<T> {
    fn default() -> Self {
        DrawBuffer {
            buffered: Vec::new(),
        }
    }
}