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use anyhow::Context;

use crate::{
    nlas::nsid::Nla,
    traits::{Emitable, Parseable},
    DecodeError,
    NsidHeader,
    NsidMessageBuffer,
};

#[derive(Debug, PartialEq, Eq, Clone, Default)]
pub struct NsidMessage {
    pub header: NsidHeader,
    pub nlas: Vec<Nla>,
}

impl<'a, T: AsRef<[u8]> + 'a> Parseable<NsidMessageBuffer<&'a T>> for NsidMessage {
    fn parse(buf: &NsidMessageBuffer<&'a T>) -> Result<Self, DecodeError> {
        Ok(Self {
            header: NsidHeader::parse(buf).context("failed to parse nsid message header")?,
            nlas: Vec::<Nla>::parse(buf).context("failed to parse nsid message NLAs")?,
        })
    }
}

impl<'a, T: AsRef<[u8]> + 'a> Parseable<NsidMessageBuffer<&'a T>> for Vec<Nla> {
    fn parse(buf: &NsidMessageBuffer<&'a T>) -> Result<Self, DecodeError> {
        let mut nlas = vec![];
        for nla_buf in buf.nlas() {
            nlas.push(Nla::parse(&nla_buf?)?);
        }
        Ok(nlas)
    }
}

impl Emitable for NsidMessage {
    fn buffer_len(&self) -> usize {
        self.header.buffer_len() + self.nlas.as_slice().buffer_len()
    }

    fn emit(&self, buffer: &mut [u8]) {
        self.header.emit(buffer);
        self.nlas
            .as_slice()
            .emit(&mut buffer[self.header.buffer_len()..]);
    }
}

#[cfg(test)]
mod test {
    use crate::{
        nlas::nsid::Nla,
        traits::ParseableParametrized,
        NetlinkBuffer,
        NsidHeader,
        NsidMessage,
        RtnlMessage,
        RtnlMessageBuffer,
        NETNSA_NSID_NOT_ASSIGNED,
        RTM_GETNSID,
        RTM_NEWNSID,
    };

    #[rustfmt::skip]
    #[test]
    fn get_ns_id_request() {
        let data = vec![
            0x1c, 0x00, 0x00, 0x00, // length = 28
            0x5a, 0x00, // message type = 90 = RTM_GETNSID
            0x01, 0x00, // flags
            0x00, 0x00, 0x00, 0x00, // seq number
            0x00, 0x00, 0x00, 0x00, // pid

            // GETNSID message
            0x00, // rtgen family
            0x00, 0x00, 0x00, // padding
            // NLA
            0x08, 0x00, // length = 8
            0x03, 0x00, // type = 3 (Fd)
            0x04, 0x00, 0x00, 0x00 // 4
        ];
        let expected = RtnlMessage::GetNsId(NsidMessage {
            header: NsidHeader { rtgen_family: 0 },
            nlas: vec![Nla::Fd(4)],
        });
        let actual = RtnlMessage::parse_with_param(&RtnlMessageBuffer::new(&NetlinkBuffer::new(&data).payload()), RTM_GETNSID).unwrap();
        assert_eq!(expected, actual);
    }

    #[rustfmt::skip]
    #[test]
    fn get_ns_id_response() {
        let data = vec![
            0x1c, 0x00, 0x00, 0x00, // length = 28
            0x58, 0x00, // message type = RTM_NEWNSID
            0x00, 0x00, // flags
            0x00, 0x00, 0x00, 0x00, // seq number
            0x76, 0x12, 0x00, 0x00, // pid

            // NETNSID message
            0x00, // rtgen family
            0x00, 0x00, 0x00, // padding
            // NLA
            0x08, 0x00, // length
            0x01, 0x00, // type = NETNSA_NSID
            0xff, 0xff, 0xff, 0xff // -1
        ];
        let expected = RtnlMessage::NewNsId(NsidMessage {
            header: NsidHeader { rtgen_family: 0 },
            nlas: vec![Nla::Id(NETNSA_NSID_NOT_ASSIGNED)],
        });
        let nl_buffer = NetlinkBuffer::new(&data).payload();
        let rtnl_buffer = RtnlMessageBuffer::new(&nl_buffer);
        let actual = RtnlMessage::parse_with_param(&rtnl_buffer, RTM_NEWNSID).unwrap();
        assert_eq!(expected, actual);
    }
}