// file: crates/ksp-onchain-transport-lib/unit_tests/grpc_unary.rs
// version: 3

#[derive(Clone, Default)]
struct FixtureGeyser;

#[allow(clippy::implicit_return)] // tonic::async_trait generates async wrapper tails outside the authored fixture bodies.
#[tonic::async_trait]
impl yellowstone_grpc_proto::geyser::geyser_server::Geyser for FixtureGeyser {
    type SubscribeStream = std::pin::Pin<
        std::boxed::Box<dyn futures_util::Stream<Item = std::result::Result<yellowstone_grpc_proto::geyser::SubscribeUpdate, tonic::Status>> + Send + 'static>,
    >;

    async fn subscribe(
        &self,
        _request: tonic::Request<tonic::Streaming<yellowstone_grpc_proto::geyser::SubscribeRequest>>,
    ) -> std::result::Result<tonic::Response<Self::SubscribeStream>, tonic::Status> {
        return std::result::Result::Err(tonic::Status::unimplemented("streaming is outside the pre.003 fixture"));
    }

    type SubscribeDeshredStream = std::pin::Pin<
        std::boxed::Box<
            dyn futures_util::Stream<Item = std::result::Result<yellowstone_grpc_proto::geyser::SubscribeUpdateDeshred, tonic::Status>> + Send + 'static,
        >,
    >;

    async fn subscribe_deshred(
        &self,
        _request: tonic::Request<tonic::Streaming<yellowstone_grpc_proto::geyser::SubscribeDeshredRequest>>,
    ) -> std::result::Result<tonic::Response<Self::SubscribeDeshredStream>, tonic::Status> {
        return std::result::Result::Err(tonic::Status::unimplemented("deshred is outside KSP 0.2.9"));
    }

    async fn subscribe_replay_info(
        &self,
        request: tonic::Request<yellowstone_grpc_proto::geyser::SubscribeReplayInfoRequest>,
    ) -> std::result::Result<tonic::Response<yellowstone_grpc_proto::geyser::SubscribeReplayInfoResponse>, tonic::Status> {
        if let std::result::Result::Err(error) = verify_fixture_metadata(request.metadata()) {
            return std::result::Result::Err(error);
        }
        return std::result::Result::Ok(tonic::Response::new(yellowstone_grpc_proto::geyser::SubscribeReplayInfoResponse {
            first_available: std::option::Option::Some(100),
        }));
    }

    async fn ping(
        &self,
        request: tonic::Request<yellowstone_grpc_proto::geyser::PingRequest>,
    ) -> std::result::Result<tonic::Response<yellowstone_grpc_proto::geyser::PongResponse>, tonic::Status> {
        if let std::result::Result::Err(error) = verify_fixture_metadata(request.metadata()) {
            return std::result::Result::Err(error);
        }
        let count = request.into_inner().count;
        if count == -999 {
            return std::result::Result::Err(tonic::Status::permission_denied("GRPC-REMOTE-SECRET-CANARY"));
        }
        return std::result::Result::Ok(tonic::Response::new(yellowstone_grpc_proto::geyser::PongResponse { count }));
    }

    async fn get_latest_blockhash(
        &self,
        request: tonic::Request<yellowstone_grpc_proto::geyser::GetLatestBlockhashRequest>,
    ) -> std::result::Result<tonic::Response<yellowstone_grpc_proto::geyser::GetLatestBlockhashResponse>, tonic::Status> {
        if let std::result::Result::Err(error) = verify_fixture_metadata(request.metadata()) {
            return std::result::Result::Err(error);
        }
        if let std::result::Result::Err(error) = require_commitment(request.get_ref().commitment, yellowstone_grpc_proto::geyser::CommitmentLevel::Confirmed) {
            return std::result::Result::Err(error);
        }
        return std::result::Result::Ok(tonic::Response::new(yellowstone_grpc_proto::geyser::GetLatestBlockhashResponse {
            slot: 101,
            blockhash: "fixture-blockhash".to_owned(),
            last_valid_block_height: 999,
        }));
    }

    async fn get_block_height(
        &self,
        request: tonic::Request<yellowstone_grpc_proto::geyser::GetBlockHeightRequest>,
    ) -> std::result::Result<tonic::Response<yellowstone_grpc_proto::geyser::GetBlockHeightResponse>, tonic::Status> {
        if let std::result::Result::Err(error) = verify_fixture_metadata(request.metadata()) {
            return std::result::Result::Err(error);
        }
        if let std::result::Result::Err(error) = require_commitment(request.get_ref().commitment, yellowstone_grpc_proto::geyser::CommitmentLevel::Confirmed) {
            return std::result::Result::Err(error);
        }
        return std::result::Result::Ok(tonic::Response::new(yellowstone_grpc_proto::geyser::GetBlockHeightResponse { block_height: 202 }));
    }

    async fn get_slot(
        &self,
        request: tonic::Request<yellowstone_grpc_proto::geyser::GetSlotRequest>,
    ) -> std::result::Result<tonic::Response<yellowstone_grpc_proto::geyser::GetSlotResponse>, tonic::Status> {
        if let std::result::Result::Err(error) = verify_fixture_metadata(request.metadata()) {
            return std::result::Result::Err(error);
        }
        if request.get_ref().commitment == std::option::Option::Some(yellowstone_grpc_proto::geyser::CommitmentLevel::Processed as i32) {
            tokio::time::sleep(std::time::Duration::from_millis(50)).await;
        } else if let std::result::Result::Err(error) =
            require_commitment(request.get_ref().commitment, yellowstone_grpc_proto::geyser::CommitmentLevel::Confirmed)
        {
            return std::result::Result::Err(error);
        }
        return std::result::Result::Ok(tonic::Response::new(yellowstone_grpc_proto::geyser::GetSlotResponse { slot: 303 }));
    }

    async fn is_blockhash_valid(
        &self,
        request: tonic::Request<yellowstone_grpc_proto::geyser::IsBlockhashValidRequest>,
    ) -> std::result::Result<tonic::Response<yellowstone_grpc_proto::geyser::IsBlockhashValidResponse>, tonic::Status> {
        if let std::result::Result::Err(error) = verify_fixture_metadata(request.metadata()) {
            return std::result::Result::Err(error);
        }
        if let std::result::Result::Err(error) = require_commitment(request.get_ref().commitment, yellowstone_grpc_proto::geyser::CommitmentLevel::Confirmed) {
            return std::result::Result::Err(error);
        }
        if request.get_ref().blockhash != "fixture-blockhash" {
            return std::result::Result::Err(tonic::Status::invalid_argument("unexpected fixture blockhash"));
        }
        return std::result::Result::Ok(tonic::Response::new(yellowstone_grpc_proto::geyser::IsBlockhashValidResponse { slot: 404, valid: true }));
    }

    async fn get_version(
        &self,
        request: tonic::Request<yellowstone_grpc_proto::geyser::GetVersionRequest>,
    ) -> std::result::Result<tonic::Response<yellowstone_grpc_proto::geyser::GetVersionResponse>, tonic::Status> {
        if let std::result::Result::Err(error) = verify_fixture_metadata(request.metadata()) {
            return std::result::Result::Err(error);
        }
        return std::result::Result::Ok(tonic::Response::new(yellowstone_grpc_proto::geyser::GetVersionResponse {
            version: "fixture-yellowstone-12.6".to_owned(),
        }));
    }
}

struct FixtureServer {
    endpoint_url: std::string::String,
    shutdown: std::option::Option<tokio::sync::oneshot::Sender<()>>,
    task: tokio::task::JoinHandle<()>,
}

impl FixtureServer {
    async fn start() -> Self {
        let bind_address: std::net::SocketAddr = "127.0.0.1:0".parse().expect("fixture bind address must parse");
        let incoming = tonic::transport::server::TcpIncoming::bind(bind_address).expect("fixture gRPC listener must bind");
        let local_address = incoming.local_addr().expect("fixture gRPC listener must expose local address");
        let (shutdown, shutdown_receiver) = tokio::sync::oneshot::channel();
        let task = tokio::spawn(async move {
            let service = yellowstone_grpc_proto::geyser::geyser_server::GeyserServer::new(FixtureGeyser);
            let result = tonic::transport::Server::builder()
                .serve_with_incoming_shutdown(service, incoming, async move {
                    let _ = shutdown_receiver.await;
                })
                .await;
            assert!(result.is_ok());
        });
        return Self { endpoint_url: format!("http://{local_address}"), shutdown: std::option::Option::Some(shutdown), task };
    }

    async fn stop(mut self) {
        if let std::option::Option::Some(shutdown) = self.shutdown.take() {
            let _ = shutdown.send(());
        }
        let result = self.task.await;
        assert!(result.is_ok());
    }
}

fn verify_fixture_metadata(metadata: &tonic::metadata::MetadataMap) -> std::result::Result<(), tonic::Status> {
    let public = metadata.get("x-ksp-public").and_then(|value| return value.to_str().ok());
    let secret = metadata.get("x-ksp-token").and_then(|value| return value.to_str().ok());
    if public != std::option::Option::Some("fixture-public") || secret != std::option::Option::Some("GRPC-SECRET-CANARY") {
        return std::result::Result::Err(tonic::Status::unauthenticated("fixture metadata mismatch"));
    }
    return std::result::Result::Ok(());
}

fn require_commitment(actual: std::option::Option<i32>, expected: yellowstone_grpc_proto::geyser::CommitmentLevel) -> std::result::Result<(), tonic::Status> {
    if actual != std::option::Option::Some(expected as i32) {
        return std::result::Result::Err(tonic::Status::invalid_argument("fixture commitment mismatch"));
    }
    return std::result::Result::Ok(());
}

fn fixture_settings(url: &str, unary_timeout: std::time::Duration) -> crate::YellowstoneGrpcEndpointSettings {
    let defaults = crate::YellowstoneGrpcSessionSettings::default();
    let session = crate::YellowstoneGrpcSessionSettings::new(
        defaults.connect_timeout(),
        unary_timeout,
        defaults.close_timeout(),
        defaults.reconnect().clone(),
        defaults.request_channel_capacity(),
        defaults.update_channel_capacity(),
        defaults.max_inbound_message_size_bytes(),
        defaults.max_outbound_message_size_bytes(),
    );
    let metadata = std::vec![
        crate::YellowstoneGrpcMetadataEntry::public("x-ksp-public", "fixture-public").expect("fixture public metadata must be valid"),
        crate::YellowstoneGrpcMetadataEntry::secret("x-ksp-token", "GRPC-SECRET-CANARY").expect("fixture secret metadata must be valid"),
    ];
    return crate::YellowstoneGrpcEndpointSettings::new(
        "fixture",
        true,
        crate::YellowstoneGrpcProviderName::new("fixture-provider"),
        crate::YellowstoneGrpcClusterName::new("devnet"),
        crate::YellowstoneGrpcEndpointUrl::parse(url).expect("fixture URL must parse"),
        session,
    )
    .with_metadata(metadata)
    .expect("fixture metadata settings must validate");
}

#[tokio::test(flavor = "current_thread")]
async fn yellowstone_unary_fixture_covers_all_seven_standard_methods_and_metadata() {
    let server = FixtureServer::start().await;
    let settings = fixture_settings(server.endpoint_url.as_str(), std::time::Duration::from_secs(1));
    let channel = crate::YellowstoneGrpcChannel::connect(&settings).await.expect("fixture channel must connect");
    let client = channel.standard_unary_client();
    let replay = client.subscribe_replay_info().await.expect("ReplayInfo fixture must succeed");
    assert_eq!(replay.first_available(), std::option::Option::Some(100));
    let pong = client.ping(7).await.expect("Ping fixture must succeed");
    assert_eq!(pong.count(), 7);
    let latest = client
        .get_latest_blockhash(std::option::Option::Some(crate::SolanaCommitment::Confirmed))
        .await
        .expect("latest blockhash fixture must succeed");
    assert_eq!(latest.slot(), 101);
    assert_eq!(latest.blockhash(), "fixture-blockhash");
    assert_eq!(latest.last_valid_block_height(), 999);
    let height = client.get_block_height(std::option::Option::Some(crate::SolanaCommitment::Confirmed)).await.expect("block height fixture must succeed");
    assert_eq!(height.block_height(), 202);
    let slot = client.get_slot(std::option::Option::Some(crate::SolanaCommitment::Confirmed)).await.expect("slot fixture must succeed");
    assert_eq!(slot.slot(), 303);
    let validity = client
        .is_blockhash_valid("fixture-blockhash", std::option::Option::Some(crate::SolanaCommitment::Confirmed))
        .await
        .expect("blockhash validity fixture must succeed");
    assert_eq!(validity.slot(), 404);
    assert!(validity.valid());
    let version = client.get_version().await.expect("version fixture must succeed");
    assert_eq!(version.version(), "fixture-yellowstone-12.6");
    let rendered = format!("{client:?} {channel:?}");
    assert!(!rendered.contains("GRPC-SECRET-CANARY"));
    assert!(!rendered.contains(server.endpoint_url.as_str()));
    server.stop().await;
}

#[tokio::test(flavor = "current_thread")]
async fn yellowstone_remote_status_does_not_copy_message_details_or_metadata() {
    let server = FixtureServer::start().await;
    let settings = fixture_settings(server.endpoint_url.as_str(), std::time::Duration::from_secs(1));
    let channel = crate::YellowstoneGrpcChannel::connect(&settings).await.expect("fixture channel must connect");
    let error = channel.standard_unary_client().ping(-999).await.expect_err("fixture must return remote status");
    assert_eq!(error.code(), crate::ERROR_CODE_GRPC_STATUS);
    let rendered = format!("{error:?}");
    assert!(!rendered.contains("GRPC-REMOTE-SECRET-CANARY"));
    assert!(!rendered.contains("GRPC-SECRET-CANARY"));
    assert!(!rendered.contains(server.endpoint_url.as_str()));
    server.stop().await;
}

#[tokio::test(flavor = "current_thread")]
async fn yellowstone_unary_timeout_is_bounded_and_safe() {
    let server = FixtureServer::start().await;
    let settings = fixture_settings(server.endpoint_url.as_str(), std::time::Duration::from_millis(5));
    let channel = crate::YellowstoneGrpcChannel::connect(&settings).await.expect("fixture channel must connect");
    let error = channel
        .standard_unary_client()
        .get_slot(std::option::Option::Some(crate::SolanaCommitment::Processed))
        .await
        .expect_err("delayed fixture must exceed unary timeout");
    assert_eq!(error.code(), crate::ERROR_CODE_TIMEOUT);
    let rendered = format!("{error:?}");
    assert!(!rendered.contains("GRPC-SECRET-CANARY"));
    assert!(!rendered.contains(server.endpoint_url.as_str()));
    server.stop().await;
}

#[tokio::test(flavor = "current_thread")]
async fn yellowstone_invalid_blockhash_is_rejected_before_io() {
    let settings = fixture_settings("http://127.0.0.1:1", std::time::Duration::from_secs(1));
    let channel = crate::YellowstoneGrpcChannel::prepare(&settings).expect("lazy fixture channel must prepare");
    let error = channel
        .standard_unary_client()
        .is_blockhash_valid(" ", std::option::Option::None)
        .await
        .expect_err("invalid blockhash must be rejected locally");
    assert_eq!(error.code(), crate::ERROR_CODE_INVALID_RPC_PARAMETERS);
}