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

// This code was copied and then modified from Tokio's Axum.

/* Copyright (c) 2021 Tower Contributors
 *
 * 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.
 */

//! Macros implementation.

/// Define a type that implements [`std::future::Future`].
#[macro_export]
macro_rules! opaque_future {
    ($(#[$m:meta])* pub type $name:ident = $actual:ty;) => {
        opaque_future! {
            $(#[$m])*
            #[allow(clippy::type_complexity)]
            pub type $name<> = $actual;
        }
    };

    ($(#[$m:meta])* pub type $name:ident<$($param:ident),*> = $actual:ty;) => {
            pin_project_lite::pin_project! {
                $(#[$m])*
                pub struct $name<$($param),*> {
                    #[pin] future: $actual,
                }
            }

        impl<$($param),*> $name<$($param),*> {
            pub(crate) fn new(future: $actual) -> Self {
                Self { future }
            }
        }

        impl<$($param),*> std::fmt::Debug for $name<$($param),*> {
            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                f.debug_tuple(stringify!($name)).field(&format_args!("...")).finish()
            }
        }

        impl<$($param),*> std::future::Future for $name<$($param),*>
        where
            $actual: std::future::Future,
        {
            type Output = <$actual as std::future::Future>::Output;

            #[inline]
            fn poll(
                self: std::pin::Pin<&mut Self>,
                cx: &mut std::task::Context<'_>,
            ) -> std::task::Poll<Self::Output> {
                self.project().future.poll(cx)
            }
        }
    };
}

pub use opaque_future;

macro_rules! convert_to_request_rejection {
    ($from:ty, $to:ident) => {
        impl From<$from> for RequestRejection {
            fn from(err: $from) -> Self {
                Self::$to(crate::Error::new(err))
            }
        }
    };
}

macro_rules! convert_to_response_rejection {
    ($from:ty, $to:ident) => {
        impl From<$from> for ResponseRejection {
            fn from(err: $from) -> Self {
                Self::$to(crate::Error::new(err))
            }
        }
    };
}