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use crate::custom_codec::Header;

use bp3d_proto::message::{FromBytesWithHeader, Message, ShapeHeader, WriteToWithHeader};

use std::io::Write;

#[derive(Debug, Clone, Eq, PartialEq)]

pub struct ContainerHeader<'a> {

    buffer: &'a [u8],

}

impl<'a> ContainerHeader<'a> {

    pub fn new(buffer: &'a [u8]) -> Self {

        ContainerHeader { buffer }

    }

}

impl<'a> FromBytesWithHeader<'a, Header<&'a [u8]>> for ContainerHeader<'a> {

    type Output = ContainerHeader<'a>;

    fn from_bytes_with_header(

        slice: &'a [u8],

        header: &Header<&'a [u8]>,

    ) -> bp3d_proto::message::Result<Message<Self::Output>> {

        let msg = ContainerHeader {

            buffer: &slice[..header.get_size() as _],

        };

        Ok(Message::new(msg.buffer.len(), msg))

    }

}

impl<'a> WriteToWithHeader<Header<&'a [u8]>> for ContainerHeader<'a> {

    type Input<'b> = ContainerHeader<'b>;

    fn write_to_with_header<W: Write>(

        input: &Self::Input<'_>,

        header: &Header<&'a [u8]>,

        mut out: W,

    ) -> bp3d_proto::message::Result<()> {

        out.write_all(&input.buffer[..header.get_size() as _])
?0
;

        Ok(())

    }

}

impl<T: AsMut<[u8]>> ShapeHeader<Header<T>> for ContainerHeader<'_> {

    fn shape_header(&self, header: &mut Header<T>) -> bp3d_proto::message::Result<()> {

        header.set_size(self.buffer.len() as _);

        Ok(())

    }

}