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// Copyright 2018 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

use crate::protocols_handler::{
    KeepAlive, ProtocolsHandler, ProtocolsHandlerEvent, ProtocolsHandlerUpgrErr, SubstreamProtocol,
};
use crate::NegotiatedSubstream;
use libp2p_core::{
    upgrade::{DeniedUpgrade, InboundUpgrade, OutboundUpgrade},
    Multiaddr,
};
use std::task::{Context, Poll};
use void::Void;

/// Implementation of `ProtocolsHandler` that doesn't handle anything.
#[derive(Clone, Debug)]
pub struct DummyProtocolsHandler {
    pub keep_alive: KeepAlive,
}

impl Default for DummyProtocolsHandler {
    fn default() -> Self {
        DummyProtocolsHandler {
            keep_alive: KeepAlive::No,
        }
    }
}

impl ProtocolsHandler for DummyProtocolsHandler {
    type InEvent = Void;
    type OutEvent = Void;
    type Error = Void;
    type InboundProtocol = DeniedUpgrade;
    type OutboundProtocol = DeniedUpgrade;
    type OutboundOpenInfo = Void;
    type InboundOpenInfo = ();

    fn listen_protocol(&self) -> SubstreamProtocol<Self::InboundProtocol, Self::InboundOpenInfo> {
        SubstreamProtocol::new(DeniedUpgrade, ())
    }

    fn inject_fully_negotiated_inbound(
        &mut self,
        _: <Self::InboundProtocol as InboundUpgrade<NegotiatedSubstream>>::Output,
        _: Self::InboundOpenInfo,
    ) {
        unreachable!("`DeniedUpgrade` is never successful.");
    }

    fn inject_fully_negotiated_outbound(
        &mut self,
        _: <Self::OutboundProtocol as OutboundUpgrade<NegotiatedSubstream>>::Output,
        v: Self::OutboundOpenInfo,
    ) {
        void::unreachable(v)
    }

    fn inject_event(&mut self, v: Self::InEvent) {
        void::unreachable(v)
    }

    fn inject_address_change(&mut self, _: &Multiaddr) {}

    fn inject_dial_upgrade_error(
        &mut self,
        _: Self::OutboundOpenInfo,
        _: ProtocolsHandlerUpgrErr<
            <Self::OutboundProtocol as OutboundUpgrade<NegotiatedSubstream>>::Error,
        >,
    ) {
    }

    fn inject_listen_upgrade_error(
        &mut self,
        _: Self::InboundOpenInfo,
        _: ProtocolsHandlerUpgrErr<
            <Self::InboundProtocol as InboundUpgrade<NegotiatedSubstream>>::Error,
        >,
    ) {
    }

    fn connection_keep_alive(&self) -> KeepAlive {
        self.keep_alive
    }

    fn poll(
        &mut self,
        _: &mut Context<'_>,
    ) -> Poll<
        ProtocolsHandlerEvent<
            Self::OutboundProtocol,
            Self::OutboundOpenInfo,
            Self::OutEvent,
            Self::Error,
        >,
    > {
        Poll::Pending
    }
}