// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

use core::ops::{BitOr, BitOrAssign};

//= https://www.rfc-editor.org/rfc/rfc9002#section-2
//# Ack-eliciting packets:  Packets that contain ack-eliciting frames
//#    elicit an ACK from the receiver within the maximum acknowledgement
//#    delay and are called ack-eliciting packets.

/// Describes if a frame or packet requires an ACK from the peer
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub enum AckElicitation {
    NonEliciting,
    Eliciting,
}

impl Default for AckElicitation {
    fn default() -> Self {
        Self::NonEliciting
    }
}

impl AckElicitation {
    /// Returns true if the `AckElicitation` is set to `Eliciting`
    pub fn is_ack_eliciting(self) -> bool {
        matches!(self, Self::Eliciting)
    }
}

impl BitOr<AckElicitation> for AckElicitation {
    type Output = Self;

    fn bitor(self, rhs: Self) -> Self {
        match (self, rhs) {
            (Self::Eliciting, _) => Self::Eliciting,
            (_, Self::Eliciting) => Self::Eliciting,
            (_, _) => Self::NonEliciting,
        }
    }
}

impl BitOrAssign<AckElicitation> for AckElicitation {
    fn bitor_assign(&mut self, rhs: Self) {
        *self = *self | rhs;
    }
}

/// Trait to retrieve the AckElicitation for a given value
pub trait AckElicitable {
    #[inline]
    fn ack_elicitation(&self) -> AckElicitation {
        AckElicitation::Eliciting
    }
}

//= https://www.rfc-editor.org/rfc/rfc9002#section-2
//# Ack-eliciting Frames:  All frames other than ACK, PADDING, and
//#    CONNECTION_CLOSE are considered ack-eliciting.

impl<AckRanges> AckElicitable for crate::frame::Ack<AckRanges> {
    #[inline]
    fn ack_elicitation(&self) -> AckElicitation {
        AckElicitation::NonEliciting
    }
}
impl AckElicitable for crate::frame::ConnectionClose<'_> {
    #[inline]
    fn ack_elicitation(&self) -> AckElicitation {
        AckElicitation::NonEliciting
    }
}
impl<Data> AckElicitable for crate::frame::Crypto<Data> {}
//= https://www.rfc-editor.org/rfc/rfc9221#section-5.2
//# Although DATAGRAM frames are not retransmitted upon loss detection,
//# they are ack-eliciting ([RFC9002]).
impl<Data> AckElicitable for crate::frame::Datagram<Data> {}
impl AckElicitable for crate::frame::DataBlocked {}
impl AckElicitable for crate::frame::HandshakeDone {}
impl AckElicitable for crate::frame::MaxData {}
impl AckElicitable for crate::frame::MaxStreamData {}
impl AckElicitable for crate::frame::MaxStreams {}
impl AckElicitable for crate::frame::NewConnectionId<'_> {}
impl AckElicitable for crate::frame::NewToken<'_> {}
impl AckElicitable for crate::frame::Padding {
    #[inline]
    fn ack_elicitation(&self) -> AckElicitation {
        AckElicitation::NonEliciting
    }
}
impl AckElicitable for crate::frame::PathChallenge<'_> {}
impl AckElicitable for crate::frame::PathResponse<'_> {}
impl AckElicitable for crate::frame::Ping {}
impl AckElicitable for crate::frame::ResetStream {}
impl AckElicitable for crate::frame::RetireConnectionId {}
impl AckElicitable for crate::frame::StopSending {}
impl<Data> AckElicitable for crate::frame::Stream<Data> {}
impl AckElicitable for crate::frame::StreamDataBlocked {}
impl AckElicitable for crate::frame::StreamsBlocked {}