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// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use std::fmt::{Debug, Display, Error, Formatter};
use zerocopy::{AsBytes, FromBytes, FromZeros, NoCell, Ref, Unaligned};

/// Error type indicating that the given slice was not the expected size.
#[derive(Debug, Eq, PartialEq, Hash, thiserror::Error)]
pub struct WrongSize;

impl Display for WrongSize {
    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
        <Self as Debug>::fmt(self, f)
    }
}

/// Data type representing a EUI64 address.
#[derive(
    Debug, Eq, PartialEq, Hash, Copy, Clone, FromZeros, FromBytes, AsBytes, NoCell, Unaligned,
)]
#[repr(C)]
#[derive(Default)]
pub struct EUI64(pub [u8; 8]);

/// Converts a borrowed EUI64 into a borrowed byte slice.
impl<'a> std::convert::From<&'a EUI64> for &'a [u8] {
    fn from(val: &'a EUI64) -> Self {
        &val.0
    }
}

/// Converts a borrowed byte slice into a borrowed EUI64 reference.
/// Will panic if the length of the slice is not exactly 8 bytes.
impl<'a> std::convert::TryInto<&'a EUI64> for &'a [u8] {
    type Error = WrongSize;

    fn try_into(self) -> Result<&'a EUI64, Self::Error> {
        Ref::<_, EUI64>::new_unaligned(self).ok_or(WrongSize).map(Ref::into_ref)
    }
}

/// Data type representing a EUI48 address.
#[derive(
    Debug, Eq, PartialEq, Hash, Copy, Clone, FromZeros, FromBytes, AsBytes, NoCell, Unaligned,
)]
#[repr(C)]
#[derive(Default)]
pub struct EUI48(pub [u8; 6]);

/// Converts a borrowed EUI48 into a borrowed byte slice.
impl<'a> std::convert::From<&'a EUI48> for &'a [u8] {
    fn from(val: &'a EUI48) -> Self {
        &val.0
    }
}

/// Converts a borrowed byte slice into a borrowed EUI48 reference.
/// Will panic if the length of the slice is not exactly 6 bytes.
impl<'a> std::convert::TryInto<&'a EUI48> for &'a [u8] {
    type Error = WrongSize;

    fn try_into(self) -> Result<&'a EUI48, Self::Error> {
        Ref::<_, EUI48>::new_unaligned(self).ok_or(WrongSize).map(Ref::into_ref)
    }
}