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use super::{rejection::*, FromRequest, RequestParts};
use crate::BoxError;
use async_trait::async_trait;
use bytes::Bytes;
use http::{Extensions, HeaderMap, Method, Request, Uri, Version};
use std::convert::Infallible;

#[async_trait]
impl<B> FromRequest<B> for Request<B>
where
    B: Send,
{
    type Rejection = RequestAlreadyExtracted;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        let req = std::mem::replace(
            req,
            RequestParts {
                method: req.method.clone(),
                version: req.version,
                uri: req.uri.clone(),
                headers: None,
                extensions: None,
                body: None,
            },
        );

        let err = match req.try_into_request() {
            Ok(req) => return Ok(req),
            Err(err) => err,
        };

        match err.downcast::<RequestAlreadyExtracted>() {
            Ok(err) => return Err(err),
            Err(err) => unreachable!(
                "Unexpected error type from `try_into_request`: `{:?}`. This is a bug in axum, please file an issue",
                err,
            ),
        }
    }
}

#[async_trait]
impl<B> FromRequest<B> for Method
where
    B: Send,
{
    type Rejection = Infallible;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        Ok(req.method().clone())
    }
}

#[async_trait]
impl<B> FromRequest<B> for Uri
where
    B: Send,
{
    type Rejection = Infallible;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        Ok(req.uri().clone())
    }
}

#[async_trait]
impl<B> FromRequest<B> for Version
where
    B: Send,
{
    type Rejection = Infallible;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        Ok(req.version())
    }
}

#[async_trait]
impl<B> FromRequest<B> for HeaderMap
where
    B: Send,
{
    type Rejection = HeadersAlreadyExtracted;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        req.take_headers().ok_or(HeadersAlreadyExtracted)
    }
}

#[async_trait]
impl<B> FromRequest<B> for Extensions
where
    B: Send,
{
    type Rejection = ExtensionsAlreadyExtracted;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        req.take_extensions().ok_or(ExtensionsAlreadyExtracted)
    }
}

#[async_trait]
impl<B> FromRequest<B> for Bytes
where
    B: http_body::Body + Send,
    B::Data: Send,
    B::Error: Into<BoxError>,
{
    type Rejection = BytesRejection;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        let body = take_body(req)?;

        let bytes = crate::body::to_bytes(body)
            .await
            .map_err(FailedToBufferBody::from_err)?;

        Ok(bytes)
    }
}

#[async_trait]
impl<B> FromRequest<B> for String
where
    B: http_body::Body + Send,
    B::Data: Send,
    B::Error: Into<BoxError>,
{
    type Rejection = StringRejection;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        let body = take_body(req)?;

        let bytes = crate::body::to_bytes(body)
            .await
            .map_err(FailedToBufferBody::from_err)?
            .to_vec();

        let string = String::from_utf8(bytes).map_err(InvalidUtf8::from_err)?;

        Ok(string)
    }
}

#[async_trait]
impl<B> FromRequest<B> for http::request::Parts
where
    B: Send,
{
    type Rejection = RequestPartsAlreadyExtracted;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        let method = unwrap_infallible(Method::from_request(req).await);
        let uri = unwrap_infallible(Uri::from_request(req).await);
        let version = unwrap_infallible(Version::from_request(req).await);
        let headers = HeaderMap::from_request(req).await?;
        let extensions = Extensions::from_request(req).await?;

        let mut temp_request = Request::new(());
        *temp_request.method_mut() = method;
        *temp_request.uri_mut() = uri;
        *temp_request.version_mut() = version;
        *temp_request.headers_mut() = headers;
        *temp_request.extensions_mut() = extensions;

        let (parts, _) = temp_request.into_parts();

        Ok(parts)
    }
}

fn unwrap_infallible<T>(result: Result<T, Infallible>) -> T {
    match result {
        Ok(value) => value,
        Err(err) => match err {},
    }
}

pub(crate) fn take_body<B>(req: &mut RequestParts<B>) -> Result<B, BodyAlreadyExtracted> {
    req.take_body().ok_or(BodyAlreadyExtracted)
}