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use std::ops::{Add, Deref, DerefMut, Mul, Neg, Sub};
use std::sync::atomic::{AtomicBool, Ordering};

use num_traits::{Float, One, Zero};
use specs::{Component, VecStorage};

use super::InnerTransform3D;

pub struct LocalTransform3D<T> {
    wrapped: InnerTransform3D<T>,
    dirty: AtomicBool,
}

impl<T> Component for LocalTransform3D<T>
where
    T: 'static + Sync + Send,
{
    type Storage = VecStorage<Self>;
}

impl<T> Default for LocalTransform3D<T>
where
    T: Zero + One,
{
    #[inline(always)]
    fn default() -> Self {
        LocalTransform3D {
            wrapped: InnerTransform3D::default(),
            dirty: AtomicBool::new(true),
        }
    }
}

impl<T> Deref for LocalTransform3D<T>
where
    T: Zero + One,
{
    type Target = InnerTransform3D<T>;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        &self.wrapped
    }
}

impl<T> DerefMut for LocalTransform3D<T>
where
    T: Zero + One,
{
    #[inline]
    fn deref_mut(&mut self) -> &mut Self::Target {
        self.flag(true);
        &mut self.wrapped
    }
}

impl<T> LocalTransform3D<T>
where
    T: Zero + One,
{
    #[inline(always)]
    pub fn new() -> Self {
        Self::default()
    }

    #[inline(always)]
    pub fn flag(&self, dirty: bool) {
        self.dirty.store(dirty, Ordering::SeqCst)
    }

    #[inline(always)]
    pub fn is_dirty(&self) -> bool {
        self.dirty.load(Ordering::SeqCst)
    }

    #[inline(always)]
    pub fn matrix(&self) -> [T; 16]
    where
        T: Float,
        for<'a, 'b> &'a T: Mul<&'b T, Output = T>
            + Neg<Output = T>
            + Add<&'b T, Output = T>
            + Sub<&'b T, Output = T>,
    {
        self.wrapped.matrix()
    }
}