lyra-engine/lyra-ecs/src/bundle.rs

use std::{any::{TypeId, Any}, cell::Ref, ptr::NonNull, mem::size_of};

use crate::{archetype::{ComponentColumn, Archetype}, component::Component, component_info::ComponentInfo};

pub trait Bundle {
    // Get a list of type ids that this bundle is storing
    fn types(&self) -> Vec<TypeId>;
    /// Take components into a list.
    /// The return value could be seen as a list of a list of components, but that inner list
    /// only contains a single value to make it easier to add it to an archetype.
    //fn take_components(self) -> Vec<Box<dyn ComponentColumn>>;

    //fn from_component_columns(columns: Vec<&Box<dyn ComponentColumn>>) -> Self;
    //fn from_archetype(archetype: &Archetype) -> Self;

    fn info(&self) -> Vec<ComponentInfo>;

    /// Take the bundle by calling the closure with pointers to each component, its type and size.
    /// The closure is expected to take ownership of the pointer.
    fn takefn(self, cb: impl FnMut(NonNull<u8>, TypeId, usize));
}

impl<C1: Component> Bundle for (C1,) {
    fn types(&self) -> Vec<TypeId> {
        vec![self.0.type_id()]
    }

    fn info(&self) -> Vec<ComponentInfo> {
        vec![ComponentInfo::new::<C1>()]
    }

    fn takefn(self, mut cb: impl FnMut(NonNull<u8>, TypeId, usize)) {
        let (c1, ) = self;

        cb(NonNull::from(&c1).cast(), TypeId::of::<C1>(), size_of::<C1>());
    }
}

/* macro_rules! impl_bundle_tuple {
    ( $(($name: ident, $index: tt))+ ) => (
        impl<$($name: Component),+> Bundle for ($($name,)+) {
            fn types(&self) -> Vec<TypeId> {
                vec![$(self.$index.type_id()),+]
            }

            fn take_components(self) -> Vec<Box<dyn ComponentColumn>> {
                vec![$(Box::new(vec![self.$index])),+]
            }

            fn from_component_columns(columns: Vec<&Box<dyn ComponentColumn>>) -> Self {
                let mut chains = Vec::new();

                for col in columns.iter() {
                    col.
                }

                todo!()
            }
        }
    );
} */

// hopefully 16 components in a bundle is enough
//impl_bundle_tuple! { (C1, 0) }
/* impl_bundle_tuple! { (C1, 0) (C2, 1) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) (C13, 12) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) (C13, 12) (C14, 13) }
impl_bundle_tuple! { (C1, 0) (C2, 1) (C3, 2) (C4, 3) (C5, 4) (C6, 5) (C7, 6) (C8, 7) (C9, 8) (C10, 9) (C11, 10) (C12, 11) (C13, 12) (C14, 13) (C15, 14) }
 */