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use crate::{Alloc, Buffer, GraphReturn};

use super::static_cpu;

impl<'a, A> FromIterator<A> for Buffer<'a, A>
where
    A: Clone + Default,
{
    fn from_iter<T: IntoIterator<Item = A>>(iter: T) -> Self {
        let device = static_cpu();
        let from_iter = Vec::from_iter(iter);

        Buffer {
            node: device.graph().add_leaf(from_iter.len()),
            //ptr: device.alloc_with_vec(from_iter),
            ptr: Alloc::<A>::alloc_with_vec(device, from_iter),
            device: Some(device),
        }
    }
}

#[cfg(feature = "cuda")]
impl<'a, A> FromIterator<A> for Buffer<'a, A, crate::CUDA>
where
    A: Clone + Default,
{
    fn from_iter<T: IntoIterator<Item = A>>(iter: T) -> Self {
        let device = super::static_cuda();
        let from_iter = Vec::from_iter(iter);

        Buffer {
            node: device.graph().add_leaf(from_iter.len()),
            ptr: device.alloc_with_vec(from_iter),
            device: Some(device),
        }
    }
}

#[cfg(feature = "opencl")]
impl<'a, A> FromIterator<A> for Buffer<'a, A, crate::OpenCL>
where
    A: Clone + Default,
{
    fn from_iter<T: IntoIterator<Item = A>>(iter: T) -> Self {
        let device = super::static_opencl();
        let from_iter = Vec::from_iter(iter);

        Buffer {
            node: device.graph().add_leaf(from_iter.len()),
            ptr: Alloc::<A>::alloc_with_vec(device, from_iter),
            device: Some(device),
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::Buffer;

    #[test]
    fn test_from_iter() {
        let buf = Buffer::<i32>::from_iter(0..10);
        assert_eq!(buf.as_slice(), &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
    }

    #[test]
    fn test_collect() {
        let buf = (0..5).into_iter().collect::<Buffer<i32>>();
        assert_eq!(buf.read(), &[0, 1, 2, 3, 4]);
    }

    #[cfg(feature = "opencl")]
    #[test]
    fn test_from_iter_cl() {
        use crate::OpenCL;

        let buf = Buffer::<i32, OpenCL>::from_iter(0..10);
        assert_eq!(buf.read(), &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
    }

    #[cfg(feature = "opencl")]
    #[test]
    fn test_collect_cl() {
        use crate::OpenCL;

        let buf = (0..5).into_iter().collect::<Buffer<i32, OpenCL>>();
        assert_eq!(buf.read(), &[0, 1, 2, 3, 4]);
    }

    #[cfg(feature = "cuda")]
    #[test]
    fn test_from_iter_cuda() {
        use crate::CUDA;

        let buf = Buffer::<i32, CUDA>::from_iter(0..10);
        assert_eq!(buf.read(), &[0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
    }

    #[cfg(feature = "cuda")]
    #[test]
    fn test_collect_cuda() {
        use crate::CUDA;

        let buf = (0..5).into_iter().collect::<Buffer<i32, CUDA>>();
        assert_eq!(buf.read(), &[0, 1, 2, 3, 4]);
    }
}