use actix_http::ContentEncoding;
use actix_web::{
    dev::BodyEncoding as _,
    http::{header, StatusCode},
    middleware::Compress,
    web, App, HttpResponse,
};
use bytes::Bytes;

mod test_utils;
use test_utils::{brotli, gzip, zstd};

static LOREM: &[u8] = include_bytes!("fixtures/lorem.txt");
static LOREM_GZIP: &[u8] = include_bytes!("fixtures/lorem.txt.gz");
static LOREM_BR: &[u8] = include_bytes!("fixtures/lorem.txt.br");
static LOREM_ZSTD: &[u8] = include_bytes!("fixtures/lorem.txt.zst");
static LOREM_XZ: &[u8] = include_bytes!("fixtures/lorem.txt.xz");

macro_rules! test_server {
    () => {
        actix_test::start(|| {
            App::new()
                .wrap(Compress::default())
                .route("/static", web::to(|| HttpResponse::Ok().body(LOREM)))
                .route(
                    "/static-gzip",
                    web::to(|| {
                        HttpResponse::Ok()
                            // signal to compressor that content should not be altered
                            .encode_with(ContentEncoding::Identity)
                            // signal to client that content is encoded
                            .insert_header(ContentEncoding::Gzip)
                            .body(LOREM_GZIP)
                    }),
                )
                .route(
                    "/static-br",
                    web::to(|| {
                        HttpResponse::Ok()
                            // signal to compressor that content should not be altered
                            .encode_with(ContentEncoding::Identity)
                            // signal to client that content is encoded
                            .insert_header(ContentEncoding::Brotli)
                            .body(LOREM_BR)
                    }),
                )
                .route(
                    "/static-zstd",
                    web::to(|| {
                        HttpResponse::Ok()
                            // signal to compressor that content should not be altered
                            .encode_with(ContentEncoding::Identity)
                            // signal to client that content is encoded
                            .insert_header(ContentEncoding::Zstd)
                            .body(LOREM_ZSTD)
                    }),
                )
                .route(
                    "/static-xz",
                    web::to(|| {
                        HttpResponse::Ok()
                            // signal to compressor that content should not be altered
                            .encode_with(ContentEncoding::Identity)
                            // signal to client that content is encoded as 7zip
                            .insert_header((header::CONTENT_ENCODING, "xz"))
                            .body(LOREM_XZ)
                    }),
                )
                .route(
                    "/echo",
                    web::to(|body: Bytes| HttpResponse::Ok().body(body)),
                )
        })
    };
}

#[actix_rt::test]
async fn negotiate_encoding_identity() {
    let srv = test_server!();

    let req = srv
        .post("/static")
        .insert_header((header::ACCEPT_ENCODING, "identity"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING), None);

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM));

    srv.stop().await;
}

#[actix_rt::test]
async fn negotiate_encoding_gzip() {
    let srv = test_server!();

    let req = srv
        .post("/static")
        .insert_header((header::ACCEPT_ENCODING, "gzip,br,zstd"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "gzip");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM));

    let mut res = srv
        .post("/static")
        .no_decompress()
        .insert_header((header::ACCEPT_ENCODING, "gzip,br,zstd"))
        .send()
        .await
        .unwrap();
    let bytes = res.body().await.unwrap();
    assert_eq!(gzip::decode(bytes), LOREM);

    srv.stop().await;
}

#[actix_rt::test]
async fn negotiate_encoding_br() {
    let srv = test_server!();

    let req = srv
        .post("/static")
        .insert_header((header::ACCEPT_ENCODING, "br,zstd,gzip"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "br");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM));

    let mut res = srv
        .post("/static")
        .no_decompress()
        .insert_header((header::ACCEPT_ENCODING, "br,zstd,gzip"))
        .send()
        .await
        .unwrap();
    let bytes = res.body().await.unwrap();
    assert_eq!(brotli::decode(bytes), LOREM);

    srv.stop().await;
}

#[actix_rt::test]
async fn negotiate_encoding_zstd() {
    let srv = test_server!();

    let req = srv
        .post("/static")
        .insert_header((header::ACCEPT_ENCODING, "zstd,gzip,br"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "zstd");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM));

    let mut res = srv
        .post("/static")
        .no_decompress()
        .insert_header((header::ACCEPT_ENCODING, "zstd,gzip,br"))
        .send()
        .await
        .unwrap();
    let bytes = res.body().await.unwrap();
    assert_eq!(zstd::decode(bytes), LOREM);

    srv.stop().await;
}

#[cfg(all(
    feature = "compress-brotli",
    feature = "compress-gzip",
    feature = "compress-zstd",
))]
#[actix_rt::test]
async fn client_encoding_prefers_brotli() {
    let srv = test_server!();

    let req = srv.post("/static").send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "br");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM));

    srv.stop().await;
}

#[actix_rt::test]
async fn gzip_no_decompress() {
    let srv = test_server!();

    let req = srv
        .post("/static-gzip")
        // don't decompress response body
        .no_decompress()
        // signal that we want a compressed body
        .insert_header((header::ACCEPT_ENCODING, "gzip,br,zstd"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "gzip");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM_GZIP));

    srv.stop().await;
}

#[actix_rt::test]
async fn manual_custom_coding() {
    let srv = test_server!();

    let req = srv
        .post("/static-xz")
        // don't decompress response body
        .no_decompress()
        // signal that we want a compressed body
        .insert_header((header::ACCEPT_ENCODING, "xz"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "xz");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM_XZ));

    srv.stop().await;
}

#[actix_rt::test]
async fn deny_identity_coding() {
    let srv = test_server!();

    let req = srv
        .post("/static")
        // signal that we want a compressed body
        .insert_header((header::ACCEPT_ENCODING, "br, identity;q=0"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "br");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM));

    srv.stop().await;
}

#[actix_rt::test]
async fn deny_identity_coding_no_decompress() {
    let srv = test_server!();

    let req = srv
        .post("/static-br")
        // don't decompress response body
        .no_decompress()
        // signal that we want a compressed body
        .insert_header((header::ACCEPT_ENCODING, "br, identity;q=0"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "br");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM_BR));

    srv.stop().await;
}

// TODO: fix test
// currently fails because negotiation doesn't consider unknown encoding types
#[ignore]
#[actix_rt::test]
async fn deny_identity_for_manual_coding() {
    let srv = test_server!();

    let req = srv
        .post("/static-xz")
        // don't decompress response body
        .no_decompress()
        // signal that we want a compressed body
        .insert_header((header::ACCEPT_ENCODING, "xz, identity;q=0"))
        .send();

    let mut res = req.await.unwrap();
    assert_eq!(res.status(), StatusCode::OK);
    assert_eq!(res.headers().get(header::CONTENT_ENCODING).unwrap(), "xz");

    let bytes = res.body().await.unwrap();
    assert_eq!(bytes, Bytes::from_static(LOREM_XZ));

    srv.stop().await;
}