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use std::marker::PhantomData;
use std::ops::{Add, Mul, Neg, Sub};

use num_traits::Float;
use specs::{WorldExt, System};
use specs_bundler::{Bundle, Bundler};
use specs_scene_graph::{SceneGraphBundle, SceneGraphSystem};

use super::{
    GlobalTransform2D, GlobalTransform3D, Parent, Transform2D, Transform3D, TransformSystem,
};

#[derive(Debug)]
pub struct TransformBundle<'deps, T> {
    deps: Vec<&'deps str>,
    _marker: PhantomData<T>,
}

impl<'deps, T> Default for TransformBundle<'deps, T> {
    #[inline]
    fn default() -> Self {
        TransformBundle::new(&[])
    }
}

impl<'deps, T> TransformBundle<'deps, T> {
    #[inline]
    pub fn new(deps: &[&'deps str]) -> Self {
        TransformBundle {
            deps: deps.to_vec(),
            _marker: PhantomData,
        }
    }
}

impl<'deps, 'world, 'a, 'b, T> Bundle<'world, 'a, 'b> for TransformBundle<'deps, T>
where
    T: 'static + Sync + Send + Float,
    for<'c, 'd> &'c T:
        Mul<&'d T, Output = T> + Neg<Output = T> + Add<&'d T, Output = T> + Sub<&'d T, Output = T>,
{
    type Error = ();

    #[inline]
    fn bundle(
        mut self,
        mut bundler: Bundler<'world, 'a, 'b>,
    ) -> Result<Bundler<'world, 'a, 'b>, Self::Error> {
        bundler.world.register::<GlobalTransform3D<T>>();
        bundler.world.register::<Transform3D<T>>();

        bundler.world.register::<GlobalTransform2D<T>>();
        bundler.world.register::<Transform2D<T>>();

        bundler = bundler.bundle(SceneGraphBundle::<Parent>::default())?;
        self.deps.push(SceneGraphSystem::<Parent>::name());

        let mut system = TransformSystem::<T>::new();

        system.setup(&mut bundler.world);

        bundler.dispatcher_builder = bundler.dispatcher_builder.with(
            system,
            TransformSystem::<T>::name(),
            self.deps.as_slice(),
        );

        Ok(bundler)
    }
}