// SPDX-License-Identifier: MIT

use netlink_packet_core::{
    NetlinkDeserializable, NetlinkHeader, NetlinkPayload, NetlinkSerializable,
};
use netlink_packet_utils::{
    traits::{Emitable, ParseableParametrized},
    DecodeError,
};

use crate::{inet, unix, SockDiagBuffer, SOCK_DIAG_BY_FAMILY};

#[derive(Debug, PartialEq, Eq, Clone)]
pub enum SockDiagMessage {
    InetRequest(inet::InetRequest),
    InetResponse(Box<inet::InetResponse>),
    UnixRequest(unix::UnixRequest),
    UnixResponse(Box<unix::UnixResponse>),
}

impl SockDiagMessage {
    pub fn is_inet_request(&self) -> bool {
        matches!(self, SockDiagMessage::InetRequest(_))
    }

    pub fn is_inet_response(&self) -> bool {
        matches!(self, SockDiagMessage::InetResponse(_))
    }
    pub fn is_unix_request(&self) -> bool {
        matches!(self, SockDiagMessage::UnixRequest(_))
    }

    pub fn is_unix_response(&self) -> bool {
        matches!(self, SockDiagMessage::UnixResponse(_))
    }

    pub fn message_type(&self) -> u16 {
        SOCK_DIAG_BY_FAMILY
    }
}

impl Emitable for SockDiagMessage {
    fn buffer_len(&self) -> usize {
        use SockDiagMessage::*;

        match self {
            InetRequest(ref msg) => msg.buffer_len(),
            InetResponse(ref msg) => msg.buffer_len(),
            UnixRequest(ref msg) => msg.buffer_len(),
            UnixResponse(ref msg) => msg.buffer_len(),
        }
    }

    fn emit(&self, buffer: &mut [u8]) {
        use SockDiagMessage::*;

        match self {
            InetRequest(ref msg) => msg.emit(buffer),
            InetResponse(ref msg) => msg.emit(buffer),
            UnixRequest(ref msg) => msg.emit(buffer),
            UnixResponse(ref msg) => msg.emit(buffer),
        }
    }
}

impl NetlinkSerializable for SockDiagMessage {
    fn message_type(&self) -> u16 {
        self.message_type()
    }

    fn buffer_len(&self) -> usize {
        <Self as Emitable>::buffer_len(self)
    }

    fn serialize(&self, buffer: &mut [u8]) {
        self.emit(buffer)
    }
}

impl NetlinkDeserializable for SockDiagMessage {
    type Error = DecodeError;
    fn deserialize(
        header: &NetlinkHeader,
        payload: &[u8],
    ) -> Result<Self, Self::Error> {
        let buffer = SockDiagBuffer::new_checked(&payload)?;
        SockDiagMessage::parse_with_param(&buffer, header.message_type)
    }
}

impl From<SockDiagMessage> for NetlinkPayload<SockDiagMessage> {
    fn from(message: SockDiagMessage) -> Self {
        NetlinkPayload::InnerMessage(message)
    }
}