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// SPDX-License-Identifier: MIT

use anyhow::Context;
use byteorder::{ByteOrder, NativeEndian};
use netlink_packet_utils::{
    nla::{DefaultNla, Nla, NlaBuffer},
    parsers::parse_u64,
    DecodeError, Parseable,
};

const IFLA_VF_STATS_RX_PACKETS: u16 = 0;
const IFLA_VF_STATS_TX_PACKETS: u16 = 1;
const IFLA_VF_STATS_RX_BYTES: u16 = 2;
const IFLA_VF_STATS_TX_BYTES: u16 = 3;
const IFLA_VF_STATS_BROADCAST: u16 = 4;
const IFLA_VF_STATS_MULTICAST: u16 = 5;
// const IFLA_VF_STATS_PAD: u16 = 6;
const IFLA_VF_STATS_RX_DROPPED: u16 = 7;
const IFLA_VF_STATS_TX_DROPPED: u16 = 8;

#[derive(Debug, Clone, Eq, PartialEq)]
#[non_exhaustive]
pub enum VfStats {
    RxPackets(u64),
    TxPackets(u64),
    RxBytes(u64),
    TxBytes(u64),
    Broadcast(u64),
    Multicast(u64),
    RxDropped(u64),
    TxDropped(u64),
    Other(DefaultNla),
}

impl Nla for VfStats {
    fn value_len(&self) -> usize {
        match self {
            Self::Other(v) => v.value_len(),
            _ => 8,
        }
    }

    fn emit_value(&self, buffer: &mut [u8]) {
        match self {
            Self::RxPackets(v)
            | Self::TxPackets(v)
            | Self::RxBytes(v)
            | Self::TxBytes(v)
            | Self::Broadcast(v)
            | Self::Multicast(v)
            | Self::RxDropped(v)
            | Self::TxDropped(v) => NativeEndian::write_u64(buffer, *v),
            Self::Other(attr) => attr.emit_value(buffer),
        }
    }

    fn kind(&self) -> u16 {
        match self {
            Self::RxPackets(_) => IFLA_VF_STATS_RX_PACKETS,
            Self::TxPackets(_) => IFLA_VF_STATS_TX_PACKETS,
            Self::RxBytes(_) => IFLA_VF_STATS_RX_BYTES,
            Self::TxBytes(_) => IFLA_VF_STATS_TX_BYTES,
            Self::Broadcast(_) => IFLA_VF_STATS_BROADCAST,
            Self::Multicast(_) => IFLA_VF_STATS_MULTICAST,
            Self::RxDropped(_) => IFLA_VF_STATS_RX_DROPPED,
            Self::TxDropped(_) => IFLA_VF_STATS_TX_DROPPED,
            Self::Other(v) => v.kind(),
        }
    }
}

impl<'a, T: AsRef<[u8]> + ?Sized> Parseable<NlaBuffer<&'a T>> for VfStats {
    fn parse(buf: &NlaBuffer<&'a T>) -> Result<Self, DecodeError> {
        let payload = buf.value();
        Ok(match buf.kind() {
            IFLA_VF_STATS_RX_PACKETS => {
                Self::RxPackets(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_RX_PACKETS value {payload:?}"
                ))?)
            }
            IFLA_VF_STATS_TX_PACKETS => {
                Self::TxPackets(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_TX_PACKETS value {payload:?}"
                ))?)
            }
            IFLA_VF_STATS_RX_BYTES => {
                Self::RxBytes(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_RX_BYTES value {payload:?}"
                ))?)
            }
            IFLA_VF_STATS_TX_BYTES => {
                Self::TxBytes(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_TX_BYTES value {payload:?}"
                ))?)
            }
            IFLA_VF_STATS_BROADCAST => {
                Self::Broadcast(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_BROADCAST value {payload:?}"
                ))?)
            }
            IFLA_VF_STATS_MULTICAST => {
                Self::Multicast(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_MULTICAST value {payload:?}"
                ))?)
            }
            IFLA_VF_STATS_RX_DROPPED => {
                Self::RxDropped(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_RX_DROPPED value {payload:?}"
                ))?)
            }
            IFLA_VF_STATS_TX_DROPPED => {
                Self::TxDropped(parse_u64(payload).context(format!(
                    "invalid IFLA_VF_STATS_TX_DROPPED value {payload:?}"
                ))?)
            }
            kind => Self::Other(DefaultNla::parse(buf).context(format!(
                "failed to parse {kind} as DefaultNla: {payload:?}"
            ))?),
        })
    }
}