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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 serde::{Deserialize, Serialize};

use crate::error::IpcError;

// Intra-Process-Communication
// Developer should split a process into two partitions, App and TEE.

// Caller of an IPC function
// Generic U: ArgmentsInfo type
// Generic V: ReturnInfo type
pub trait IpcSender {
    fn invoke<U, V>(&mut self, cmd: u32, input: U) -> std::result::Result<V, IpcError>
    where
        U: Serialize,
        V: for<'de> Deserialize<'de>;
}

// Service Instance of an IPC function
// Generic U: ArgmentsInfo type
// Generic V: ReturnInfo type
pub trait IpcService<U, V>
where
    U: for<'de> Deserialize<'de>,
    V: Serialize,
{
    fn handle_invoke(&self, input: U) -> teaclave_types::TeeServiceResult<V>;
}

// Callee of an IPC function
// Generic U: ArgmentsInfo type
// Generic V: ReturnInfo type
// Generic X: Service Instance that serves of <U, V>
// Dispatch a received input to a specific service instance.
pub trait IpcReceiver {
    fn dispatch<U, V, X>(input: &[u8], x: X) -> anyhow::Result<Vec<u8>>
    where
        U: for<'de> Deserialize<'de>,
        V: Serialize,
        X: IpcService<U, V>;
}

cfg_if::cfg_if! {
    if #[cfg(feature = "app")]  {
        pub(crate) mod app;
        pub use app::ECallChannel;
    } else if #[cfg(feature = "mesalock_sgx")] {
        mod enclave;
        pub use enclave::ECallReceiver;
    }
}