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/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

use crate::{Framing, FramingDecoded, FramingEncodedFinal, Protocol};
use futures::stream::Stream;
use futures::{future, FutureExt};
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;

pub trait ClientFactory {
    type Api: ?Sized;

    fn new<P, T>(protocol: P, transport: T) -> Arc<Self::Api>
    where
        P: Protocol<Frame = T> + 'static,
        T: Transport + Sync;
}

pub trait Transport: Framing + Send + 'static {
    fn call(
        &self,
        service_name: &const_cstr::ConstCStr,
        fn_name: &const_cstr::ConstCStr,
        req: FramingEncodedFinal<Self>,
    ) -> Pin<Box<dyn Future<Output = Result<FramingDecoded<Self>, anyhow::Error>> + Send + 'static>>;

    fn call_stream(
        &self,
        _service_name: &const_cstr::ConstCStr,
        _fn_name: &const_cstr::ConstCStr,
        _req: FramingEncodedFinal<Self>,
    ) -> Pin<
        Box<
            dyn Future<
                    Output = Result<
                        (
                            FramingDecoded<Self>,
                            Pin<
                                Box<
                                    dyn Stream<Item = Result<FramingDecoded<Self>, anyhow::Error>>
                                        + Send
                                        + 'static,
                                >,
                            >,
                        ),
                        anyhow::Error,
                    >,
                > + Send
                + 'static,
        >,
    > {
        future::err(anyhow::Error::msg(
            "Streaming is not supported by this transport",
        ))
        .boxed()
    }
}