use async_graphql::*;
use futures::{SinkExt, Stream, StreamExt};
use std::sync::Arc;

#[async_std::test]
pub async fn test_subscription() {
    struct QueryRoot;

    #[SimpleObject]
    struct Event {
        #[field]
        a: i32,

        #[field]
        b: i32,
    }

    #[Object]
    impl QueryRoot {}

    struct SubscriptionRoot;

    #[Subscription]
    impl SubscriptionRoot {
        #[field]
        async fn values(&self, start: i32, end: i32) -> impl Stream<Item = i32> {
            futures::stream::iter(start..end)
        }

        #[field]
        async fn events(&self, start: i32, end: i32) -> impl Stream<Item = Event> {
            futures::stream::iter((start..end).map(|n| Event { a: n, b: n * 10 }))
        }
    }

    let schema = Schema::new(QueryRoot, EmptyMutation, SubscriptionRoot);

    {
        let mut stream = schema
            .create_subscription_stream(
                "subscription { values(start: 10, end: 20) }",
                None,
                Default::default(),
                None,
            )
            .await
            .unwrap();
        for i in 10..20 {
            assert_eq!(
                Some(serde_json::json!({ "values": i })),
                stream.next().await
            );
        }
        assert!(stream.next().await.is_none());
    }

    {
        let mut stream = schema
            .create_subscription_stream(
                "subscription { events(start: 10, end: 20) { a b } }",
                None,
                Default::default(),
                None,
            )
            .await
            .unwrap();
        for i in 10..20 {
            assert_eq!(
                Some(serde_json::json!({ "events": {"a": i, "b": i * 10} })),
                stream.next().await
            );
        }
        assert!(stream.next().await.is_none());
    }
}

#[async_std::test]
pub async fn test_simple_broker() {
    struct QueryRoot;

    #[SimpleObject]
    #[derive(Clone)]
    struct Event1 {
        #[field]
        value: i32,
    }

    #[SimpleObject]
    #[derive(Clone)]
    struct Event2 {
        #[field]
        value: i32,
    }

    #[Object]
    impl QueryRoot {}

    struct SubscriptionRoot;

    #[Subscription]
    impl SubscriptionRoot {
        #[field]
        async fn events1(&self) -> impl Stream<Item = Event1> {
            SimpleBroker::<Event1>::subscribe()
        }

        #[field]
        async fn events2(&self) -> impl Stream<Item = Event2> {
            SimpleBroker::<Event2>::subscribe()
        }
    }

    let schema = Schema::new(QueryRoot, EmptyMutation, SubscriptionRoot);
    let mut stream1 = schema
        .create_subscription_stream(
            "subscription { events1 { value } }",
            None,
            Default::default(),
            None,
        )
        .await
        .unwrap();
    let mut stream2 = schema
        .create_subscription_stream(
            "subscription { events2 { value } }",
            None,
            Default::default(),
            None,
        )
        .await
        .unwrap();

    SimpleBroker::publish(Event1 { value: 10 });
    SimpleBroker::publish(Event2 { value: 88 });
    SimpleBroker::publish(Event1 { value: 15 });
    SimpleBroker::publish(Event2 { value: 99 });

    assert_eq!(
        stream1.next().await,
        Some(serde_json::json!({ "events1": {"value": 10} }))
    );
    assert_eq!(
        stream1.next().await,
        Some(serde_json::json!({ "events1": {"value": 15} }))
    );

    assert_eq!(
        stream2.next().await,
        Some(serde_json::json!({ "events2": {"value": 88} }))
    );
    assert_eq!(
        stream2.next().await,
        Some(serde_json::json!({ "events2": {"value": 99} }))
    );
}

#[async_std::test]
pub async fn test_subscription_with_ctx_data() {
    struct QueryRoot;

    #[Object]
    impl QueryRoot {}

    struct SubscriptionRoot;

    #[Subscription]
    impl SubscriptionRoot {
        #[field]
        async fn values(&self, ctx: &Context<'_>) -> impl Stream<Item = i32> {
            let value = *ctx.data::<i32>();
            futures::stream::once(async move { value })
        }
    }

    let schema = Schema::new(QueryRoot, EmptyMutation, SubscriptionRoot);

    {
        let mut stream = schema
            .create_subscription_stream(
                "subscription { values }",
                None,
                Default::default(),
                Some(Arc::new({
                    let mut data = Data::default();
                    data.insert(100i32);
                    data
                })),
            )
            .await
            .unwrap();
        assert_eq!(
            Some(serde_json::json!({ "values": 100 })),
            stream.next().await
        );
        assert!(stream.next().await.is_none());
    }
}

#[async_std::test]
pub async fn test_subscription_ws_transport() {
    struct QueryRoot;

    #[Object]
    impl QueryRoot {}

    struct SubscriptionRoot;

    #[Subscription]
    impl SubscriptionRoot {
        #[field]
        async fn values(&self, ctx: &Context<'_>) -> impl Stream<Item = i32> {
            let step = *ctx.data::<i32>();
            futures::stream::iter((0..10).map(move |n| n * step))
        }
    }

    let schema = Schema::new(QueryRoot, EmptyMutation, SubscriptionRoot);
    let (mut sink, mut stream) = schema.subscription_connection(
        WebSocketTransport::default(),
        Some(Arc::new({
            let mut data = Data::default();
            data.insert(5);
            data
        })),
    );

    sink.send(
        serde_json::to_vec(&serde_json::json!({
            "type": "connection_init",
        }))
        .unwrap()
        .into(),
    )
    .await
    .unwrap();

    assert_eq!(
        Some(serde_json::json!({
        "type": "connection_ack",
        })),
        serde_json::from_slice(&stream.next().await.unwrap()).unwrap()
    );

    sink.send(
        serde_json::to_vec(&serde_json::json!({
            "type": "start",
            "id": "1",
            "payload": {
                "query": "subscription { values }"
            },
        }))
        .unwrap()
        .into(),
    )
    .await
    .unwrap();

    for i in 0..10 {
        assert_eq!(
            Some(serde_json::json!({
            "type": "data",
            "id": "1",
            "payload": { "data": { "values": i * 5 } },
            })),
            serde_json::from_slice(&stream.next().await.unwrap()).unwrap()
        );
    }
}