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//! ARP specific errors.

use crate::error::UnexpectedBufferEndError;

use core::fmt::{Debug, Display, Formatter};

#[cfg(all(feature = "error_trait", not(feature = "std")))]
use core::error;

#[cfg(feature = "std")]
use std::error;

/// Error returned when parsing an ARP header.
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub enum ParseArpError {
    /// The data buffer ended unexpectedly.
    UnexpectedBufferEnd(UnexpectedBufferEndError),
    /// The hardware or protocol type is not supported.
    UnsupportedHardwareOrProtocolFields,
    /// The operation code is not supported
    UnsupportedOperationCode {
        /// The operation code found.
        operation_code: u16,
    },
}

impl From<UnexpectedBufferEndError> for ParseArpError {
    #[inline]
    fn from(value: UnexpectedBufferEndError) -> Self {
        Self::UnexpectedBufferEnd(value)
    }
}

impl Display for ParseArpError {
    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
        match self {
            Self::UnsupportedHardwareOrProtocolFields => {
                write!(
                    f,
                    "Hardware/protocol type or length do not fit IPv4 over ethernet"
                )
            }
            Self::UnexpectedBufferEnd(err) => {
                write!(f, "{err}")
            }
            Self::UnsupportedOperationCode { operation_code } => {
                write!(
                    f,
                    "Unsupported operation code, only request(1) and reply(2) are supported, was: {operation_code}"
                )
            }
        }
    }
}

#[cfg(feature = "error_trait")]
impl error::Error for ParseArpError {}