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use crate::network::node::Node;
use alloc::boxed::Box;
use core::any::Any;

/// Simple operation which just buffers the last set input.
/// This is as example used as input.
pub struct Buffer {}

impl Buffer {


    /// Generate a new buffer
    ///
    /// ## Example
    /// ```rust
    /// use sac_base::operations::generic::buffer::Buffer;
    /// let mut buffer = Buffer::new(0.0);
    /// assert_eq!(buffer.data, 0.0);
    /// buffer.feed(1.0);
    /// assert_eq!(buffer.data, 1.0);
    /// buffer.process(vec![55.0]);
    /// assert_eq!(buffer.data, 1.0); // nothing happened
    /// ```
    pub fn new<T>(init: T) -> Node<T>
        where T: Copy
    {
        let storage = Box::new(0) as Box<dyn Any>;
        Node::new(init, storage, |_data_input, _input, _output| {})
    }
}

#[cfg(test)]
mod tests {

    use super::*;

    #[test]
    fn test_buffer() {
        let mut buffer = Buffer::new(1.0);
        assert_eq!(buffer.poll(), 1.0);
        buffer.data = 5.0;
        assert_eq!(buffer.poll(), 5.0);
        buffer.feed(10.0);
        assert_eq!(buffer.data, 10.0);
    }
}