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//! These codes are copied from `tonic/src/request.rs` and may be modified by us.

use std::fmt::Debug;

use futures::prelude::*;
use http::Extensions;

use crate::metadata::MetadataMap;

#[derive(Debug)]
pub struct Request<T> {
    metadata: MetadataMap,
    message: T,
    extensions: Extensions,
}

impl<T> Request<T> {
    /// Create a new [`Request`].
    pub fn new(message: T) -> Self {
        Self {
            metadata: MetadataMap::new(),
            message,
            extensions: Extensions::new(),
        }
    }

    /// Get a reference to the message
    pub fn get_ref(&self) -> &T {
        &self.message
    }

    /// Get a mutable reference to the message
    pub fn get_mut(&mut self) -> &mut T {
        &mut self.message
    }

    /// Get a reference to the custom request metadata.
    pub fn metadata(&self) -> &MetadataMap {
        &self.metadata
    }

    /// Get a mutable reference to the request metadata.
    pub fn metadata_mut(&mut self) -> &mut MetadataMap {
        &mut self.metadata
    }

    /// Consumes `self`, returning the message
    pub fn into_inner(self) -> T {
        self.message
    }

    pub fn into_parts(self) -> (MetadataMap, Extensions, T) {
        (self.metadata, self.extensions, self.message)
    }

    pub fn from_parts(metadata: MetadataMap, extensions: Extensions, message: T) -> Self {
        Self {
            metadata,
            extensions,
            message,
        }
    }

    pub fn from_http(http: http::Request<T>) -> Self {
        let (parts, message) = http.into_parts();
        Self::from_http_parts(parts, message)
    }

    pub fn from_http_parts(parts: http::request::Parts, message: T) -> Self {
        Self {
            metadata: MetadataMap::from_headers(parts.headers),
            message,
            extensions: parts.extensions,
        }
    }

    /// Returns a reference to the associated extensions.
    pub fn extensions(&self) -> &Extensions {
        &self.extensions
    }

    /// Returns a mutable reference to the associated extensions.
    pub fn extensions_mut(&mut self) -> &mut Extensions {
        &mut self.extensions
    }

    #[doc(hidden)]
    pub fn map<F, U>(self, f: F) -> Request<U>
    where
        F: FnOnce(T) -> U,
    {
        let message = f(self.message);

        Request {
            metadata: self.metadata,
            message,
            extensions: self.extensions,
        }
    }
}

pub trait IntoRequest<T>: sealed::Sealed {
    /// Wrap the input message `T` in a `volo_grpc::Request`
    fn into_request(self) -> Request<T>;
}

impl<T> IntoRequest<T> for T {
    fn into_request(self) -> Request<Self> {
        Request::new(self)
    }
}

impl<T> IntoRequest<T> for Request<T> {
    fn into_request(self) -> Self {
        self
    }
}

pub trait IntoStreamingRequest: sealed::Sealed {
    /// The RPC request stream type
    type Stream: Stream<Item = Self::Message> + Send + Sync + 'static;

    /// The RPC request type
    type Message;

    /// Wrap the stream of messages in a `volo_grpc::Request`
    fn into_streaming_request(self) -> Request<Self::Stream>;
}

impl<T> IntoStreamingRequest for T
where
    T: Stream + Send + Sync + 'static,
{
    type Stream = T;
    type Message = T::Item;

    fn into_streaming_request(self) -> Request<Self> {
        Request::new(self)
    }
}

impl<T> IntoStreamingRequest for Request<T>
where
    T: Stream + Send + Sync + 'static,
{
    type Stream = T;
    type Message = T::Item;

    fn into_streaming_request(self) -> Self {
        self
    }
}

impl<T> sealed::Sealed for T {}

mod sealed {
    pub trait Sealed {}
}