use std::sync::atomic::{AtomicUsize, Ordering};

use ecs::Component;

use crate::util::builder;

static CURRENT_BUNDLE_ID: AtomicUsize = AtomicUsize::new(0);

builder! {
/// Flags for how a object should be drawn.
#[builder(name = Builder, derives = (Debug, Default, Clone))]
#[derive(Debug, Default, Clone, Component)]
#[non_exhaustive]
pub struct DrawFlags
{
    pub polygon_mode_config: PolygonModeConfig,
}
}

impl DrawFlags
{
    pub fn builder() -> Builder
    {
        Builder::default()
    }
}

#[derive(Debug, Default, Clone)]
pub struct PolygonModeConfig
{
    pub face: PolygonModeFace,
    pub mode: PolygonMode,
}

#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum PolygonMode
{
    Point,
    Line,

    #[default]
    Fill,
}

#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum PolygonModeFace
{
    Front,
    Back,

    #[default]
    FrontAndBack,
}

/// Metadata for how a object should be drawn together with other objects.
#[derive(Debug, Clone, Component)]
pub struct DrawingBundled
{
    pub bundle_id: DrawingBundleId,
    pub order: usize,
}

/// The ID of a object drawing bundle.
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct DrawingBundleId
{
    inner: usize,
}

impl DrawingBundleId
{
    /// Creates a new unique bundle ID.
    pub fn new() -> Self
    {
        Self {
            inner: CURRENT_BUNDLE_ID.fetch_add(1, Ordering::Relaxed),
        }
    }

    pub fn inner(&self) -> usize
    {
        self.inner
    }
}