use actix::prelude::*;
use actix_http::ws::Codec;
use actix_web::{test, web, App, HttpRequest};
use actix_web_actors::*;
use bytes::Bytes;
use futures_util::{SinkExt, StreamExt};

struct Ws;

impl Actor for Ws {
    type Context = ws::WebsocketContext<Self>;
}

impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for Ws {
    fn handle(
        &mut self,
        msg: Result<ws::Message, ws::ProtocolError>,
        ctx: &mut Self::Context,
    ) {
        match msg.unwrap() {
            ws::Message::Ping(msg) => ctx.pong(&msg),
            ws::Message::Text(text) => ctx.text(text),
            ws::Message::Binary(bin) => ctx.binary(bin),
            ws::Message::Close(reason) => ctx.close(reason),
            _ => {}
        }
    }
}

const MAX_FRAME_SIZE: usize = 10_000;
const DEFAULT_FRAME_SIZE: usize = 10;

async fn common_test_code(mut srv: test::TestServer, frame_size: usize) {
    // client service
    let mut framed = srv.ws().await.unwrap();
    framed.send(ws::Message::Text("text".into())).await.unwrap();

    let item = framed.next().await.unwrap().unwrap();
    assert_eq!(item, ws::Frame::Text(Bytes::from_static(b"text")));

    let bytes = Bytes::from(vec![0; frame_size]);
    framed
        .send(ws::Message::Binary(bytes.clone()))
        .await
        .unwrap();
    let item = framed.next().await.unwrap().unwrap();
    assert_eq!(item, ws::Frame::Binary(bytes));

    framed.send(ws::Message::Ping("text".into())).await.unwrap();
    let item = framed.next().await.unwrap().unwrap();
    assert_eq!(item, ws::Frame::Pong(Bytes::copy_from_slice(b"text")));

    framed
        .send(ws::Message::Close(Some(ws::CloseCode::Normal.into())))
        .await
        .unwrap();

    let item = framed.next().await.unwrap().unwrap();
    assert_eq!(item, ws::Frame::Close(Some(ws::CloseCode::Normal.into())));
}

#[actix_rt::test]
async fn test_builder() {
    let srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::WsResponseBuilder::new(Ws, &req, stream).start()
            },
        ))
    });

    common_test_code(srv, DEFAULT_FRAME_SIZE).await;
}

#[actix_rt::test]
async fn test_builder_with_frame_size() {
    let srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::WsResponseBuilder::new(Ws, &req, stream)
                    .frame_size(MAX_FRAME_SIZE)
                    .start()
            },
        ))
    });

    common_test_code(srv, MAX_FRAME_SIZE).await;
}

#[actix_rt::test]
#[should_panic]
async fn test_builder_with_frame_size_exceeded() {
    let mut srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::WsResponseBuilder::new(Ws, &req, stream)
                    .frame_size(MAX_FRAME_SIZE)
                    .start()
            },
        ))
    });

    // client service
    let mut framed = srv.ws().await.unwrap();

    // Create a request with a frame size larger than expected. This should
    // panic with '`Err` value: Overflow'.
    let bytes = Bytes::from(vec![0; MAX_FRAME_SIZE + 1]);
    framed
        .send(ws::Message::Binary(bytes.clone()))
        .await
        .unwrap();

    // try unwrapping to panic.
    framed.next().await.unwrap().unwrap();
}

#[actix_rt::test]
async fn test_builder_with_codec() {
    let srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::WsResponseBuilder::new(Ws, &req, stream)
                    .codec(Codec::new())
                    .start()
            },
        ))
    });

    common_test_code(srv, DEFAULT_FRAME_SIZE).await;
}

#[actix_rt::test]
async fn test_builder_with_protocols() {
    let srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::WsResponseBuilder::new(Ws, &req, stream)
                    .protocols(&["A", "B"])
                    .start()
            },
        ))
    });

    common_test_code(srv, DEFAULT_FRAME_SIZE).await;
}

#[actix_rt::test]
async fn test_builder_full() {
    let srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::WsResponseBuilder::new(Ws, &req, stream)
                    .frame_size(MAX_FRAME_SIZE)
                    .codec(Codec::new())
                    .protocols(&["A", "B"])
                    .start()
            },
        ))
    });

    common_test_code(srv, MAX_FRAME_SIZE).await;
}

#[actix_rt::test]
async fn test_builder_with_codec_and_frame_size() {
    let srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::WsResponseBuilder::new(Ws, &req, stream)
                    .codec(Codec::new())
                    .frame_size(MAX_FRAME_SIZE)
                    .start()
            },
        ))
    });

    common_test_code(srv, DEFAULT_FRAME_SIZE).await;
}

#[actix_rt::test]
async fn test_simple() {
    let srv = test::start(|| {
        App::new().service(web::resource("/").to(
            |req: HttpRequest, stream: web::Payload| async move {
                ws::start(Ws, &req, stream)
            },
        ))
    });

    common_test_code(srv, DEFAULT_FRAME_SIZE).await;
}