//! Extra integration coverage for server main HID startup branches.
//!
//! Scope: include `server/src/main.rs` and exercise successful handler startup
//! with synthetic HID endpoints.
//! Targets: `server/src/main.rs`.
//! Why: the main contract file is near the 500 LOC cap, so additional branch
//! coverage lives here.

#[allow(warnings)]
mod server_main_binary_extra {
    include!(env!("LESAVKA_SERVER_MAIN_SRC"));

    use futures_util::stream;
    use lesavka_common::lesavka::relay_client::RelayClient;
    use serial_test::serial;
    use std::path::Path;
    use temp_env::with_var;
    use tempfile::tempdir;

    async fn connect_with_retry(addr: std::net::SocketAddr) -> tonic::transport::Channel {
        let endpoint = tonic::transport::Endpoint::from_shared(format!("http://{addr}"))
            .expect("endpoint")
            .tcp_nodelay(true);
        for _ in 0..40 {
            if let Ok(channel) = endpoint.clone().connect().await {
                return channel;
            }
            tokio::time::sleep(std::time::Duration::from_millis(25)).await;
        }
        panic!("failed to connect to local tonic server");
    }

    fn write_file(path: &Path, content: &str) {
        if let Some(parent) = path.parent() {
            std::fs::create_dir_all(parent).expect("create parent");
        }
        std::fs::write(path, content).expect("write file");
    }

    fn with_fake_gadget_roots(sys_root: &Path, cfg_root: &Path, f: impl FnOnce()) {
        let sys_root = sys_root.to_string_lossy().to_string();
        let cfg_root = cfg_root.to_string_lossy().to_string();
        with_var("LESAVKA_GADGET_SYSFS_ROOT", Some(sys_root), || {
            with_var("LESAVKA_GADGET_CONFIGFS_ROOT", Some(cfg_root), f);
        });
    }

    fn build_fake_gadget_tree(base: &Path, ctrl: &str, gadget_name: &str, state: &str) {
        write_file(
            &base.join(format!("sys/class/udc/{ctrl}/state")),
            &format!("{state}\n"),
        );
        write_file(
            &base.join(format!("cfg/{gadget_name}/UDC")),
            &format!("{ctrl}\n"),
        );
    }

    fn build_handler_for_tests_with_modes(
        kb_writable: bool,
        ms_writable: bool,
    ) -> (tempfile::TempDir, Handler) {
        let dir = tempdir().expect("tempdir");
        let kb_path = dir.path().join("hidg0.bin");
        let ms_path = dir.path().join("hidg1.bin");
        std::fs::write(&kb_path, []).expect("create kb file");
        std::fs::write(&ms_path, []).expect("create ms file");

        let kb_std = std::fs::OpenOptions::new()
            .read(true)
            .write(kb_writable)
            .create(kb_writable)
            .truncate(kb_writable)
            .open(&kb_path)
            .expect("open kb");
        let ms_std = std::fs::OpenOptions::new()
            .read(true)
            .write(ms_writable)
            .create(ms_writable)
            .truncate(ms_writable)
            .open(&ms_path)
            .expect("open ms");
        let kb = tokio::fs::File::from_std(kb_std);
        let ms = tokio::fs::File::from_std(ms_std);

        (
            dir,
            Handler {
                kb: std::sync::Arc::new(tokio::sync::Mutex::new(kb)),
                ms: std::sync::Arc::new(tokio::sync::Mutex::new(ms)),
                gadget: UsbGadget::new("lesavka"),
                did_cycle: std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false)),
                camera_rt: std::sync::Arc::new(CameraRuntime::new()),
                capture_power: CapturePowerManager::new(),
            },
        )
    }

    fn build_handler_for_tests() -> (tempfile::TempDir, Handler) {
        build_handler_for_tests_with_modes(true, true)
    }

    #[test]
    #[serial]
    fn handler_new_and_reopen_hid_succeed_with_override_paths() {
        let dir = tempdir().expect("tempdir");
        std::fs::write(dir.path().join("hidg0"), "").expect("create hidg0");
        std::fs::write(dir.path().join("hidg1"), "").expect("create hidg1");
        let hid_dir = dir.path().to_string_lossy().to_string();

        with_var("LESAVKA_HID_DIR", Some(hid_dir), || {
            with_var("LESAVKA_ALLOW_GADGET_CYCLE", None::<&str>, || {
                let rt = tokio::runtime::Runtime::new().expect("runtime");
                rt.block_on(async {
                    let handler = Handler::new(UsbGadget::new("lesavka"))
                        .await
                        .expect("handler startup");
                    handler.reopen_hid().await.expect("reopen hid");
                });
            });
        });
    }

    #[test]
    #[serial]
    fn handler_new_with_cycle_enabled_can_still_open_override_paths() {
        let dir = tempdir().expect("tempdir");
        std::fs::write(dir.path().join("hidg0"), "").expect("create hidg0");
        std::fs::write(dir.path().join("hidg1"), "").expect("create hidg1");
        let hid_dir = dir.path().to_string_lossy().to_string();

        with_var("LESAVKA_HID_DIR", Some(hid_dir), || {
            with_var("LESAVKA_ALLOW_GADGET_CYCLE", Some("1"), || {
                let rt = tokio::runtime::Runtime::new().expect("runtime");
                rt.block_on(async {
                    let _handler = Handler::new(UsbGadget::new("lesavka"))
                        .await
                        .expect("handler startup with cycle enabled");
                });
            });
        });
    }

    #[test]
    #[serial]
    fn stream_keyboard_writes_reports_to_hid_file() {
        let rt = tokio::runtime::Runtime::new().expect("runtime");
        rt.block_on(async {
            let (dir, handler) = build_handler_for_tests();
            let kb_path = dir.path().join("hidg0.bin");

            let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("bind");
            let addr = listener.local_addr().expect("addr");
            drop(listener);

            let server = tokio::spawn(async move {
                let _ = tonic::transport::Server::builder()
                    .add_service(RelayServer::new(handler))
                    .serve(addr)
                    .await;
            });

            let channel = connect_with_retry(addr).await;
            let mut cli = RelayClient::new(channel);
            let (tx, rx) = tokio::sync::mpsc::channel(4);
            tx.send(KeyboardReport {
                data: vec![1, 2, 3, 4, 5, 6, 7, 8],
            })
            .await
            .expect("send keyboard packet");
            drop(tx);

            let outbound = tokio_stream::wrappers::ReceiverStream::new(rx);
            let mut resp = cli
                .stream_keyboard(tonic::Request::new(outbound))
                .await
                .expect("stream keyboard");
            let echoed = resp
                .get_mut()
                .message()
                .await
                .expect("grpc result")
                .expect("echo packet");
            assert_eq!(echoed.data, vec![1, 2, 3, 4, 5, 6, 7, 8]);

            tokio::time::sleep(std::time::Duration::from_millis(30)).await;
            let written = std::fs::read(&kb_path).expect("read hidg0 file");
            assert!(
                !written.is_empty(),
                "keyboard stream should write HID bytes to target file"
            );

            server.abort();
        });
    }

    #[test]
    #[serial]
    fn stream_mouse_writes_reports_to_hid_file() {
        let rt = tokio::runtime::Runtime::new().expect("runtime");
        rt.block_on(async {
            let (dir, handler) = build_handler_for_tests();
            let ms_path = dir.path().join("hidg1.bin");

            let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("bind");
            let addr = listener.local_addr().expect("addr");
            drop(listener);

            let server = tokio::spawn(async move {
                let _ = tonic::transport::Server::builder()
                    .add_service(RelayServer::new(handler))
                    .serve(addr)
                    .await;
            });

            let channel = connect_with_retry(addr).await;
            let mut cli = RelayClient::new(channel);
            let (tx, rx) = tokio::sync::mpsc::channel(4);
            tx.send(MouseReport {
                data: vec![8, 7, 6, 5, 4, 3, 2, 1],
            })
            .await
            .expect("send mouse packet");
            drop(tx);

            let outbound = tokio_stream::wrappers::ReceiverStream::new(rx);
            let mut resp = cli
                .stream_mouse(tonic::Request::new(outbound))
                .await
                .expect("stream mouse");
            let echoed = resp
                .get_mut()
                .message()
                .await
                .expect("grpc result")
                .expect("echo packet");
            assert_eq!(echoed.data, vec![8, 7, 6, 5, 4, 3, 2, 1]);

            tokio::time::sleep(std::time::Duration::from_millis(30)).await;
            let written = std::fs::read(&ms_path).expect("read hidg1 file");
            assert!(
                !written.is_empty(),
                "mouse stream should write HID bytes to target file"
            );

            server.abort();
        });
    }

    #[test]
    #[serial]
    fn stream_keyboard_recovers_when_hid_write_fails() {
        let rt = tokio::runtime::Runtime::new().expect("runtime");
        rt.block_on(async {
            let (_dir, handler) = build_handler_for_tests_with_modes(false, true);

            let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("bind");
            let addr = listener.local_addr().expect("addr");
            drop(listener);

            let server = tokio::spawn(async move {
                let _ = tonic::transport::Server::builder()
                    .add_service(RelayServer::new(handler))
                    .serve(addr)
                    .await;
            });

            let channel = connect_with_retry(addr).await;
            let mut cli = RelayClient::new(channel);
            let (tx, rx) = tokio::sync::mpsc::channel(4);
            tx.send(KeyboardReport {
                data: vec![11, 12, 13, 14, 15, 16, 17, 18],
            })
            .await
            .expect("send keyboard packet");
            drop(tx);

            let outbound = tokio_stream::wrappers::ReceiverStream::new(rx);
            let mut resp = cli
                .stream_keyboard(tonic::Request::new(outbound))
                .await
                .expect("stream keyboard");
            let echoed = resp
                .get_mut()
                .message()
                .await
                .expect("grpc result")
                .expect("echo packet");
            assert_eq!(echoed.data, vec![11, 12, 13, 14, 15, 16, 17, 18]);

            server.abort();
        });
    }

    #[test]
    #[serial]
    fn stream_mouse_recovers_when_hid_write_fails() {
        let rt = tokio::runtime::Runtime::new().expect("runtime");
        rt.block_on(async {
            let (_dir, handler) = build_handler_for_tests_with_modes(true, false);

            let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("bind");
            let addr = listener.local_addr().expect("addr");
            drop(listener);

            let server = tokio::spawn(async move {
                let _ = tonic::transport::Server::builder()
                    .add_service(RelayServer::new(handler))
                    .serve(addr)
                    .await;
            });

            let channel = connect_with_retry(addr).await;
            let mut cli = RelayClient::new(channel);
            let (tx, rx) = tokio::sync::mpsc::channel(4);
            tx.send(MouseReport {
                data: vec![21, 22, 23, 24, 25, 26, 27, 28],
            })
            .await
            .expect("send mouse packet");
            drop(tx);

            let outbound = tokio_stream::wrappers::ReceiverStream::new(rx);
            let mut resp = cli
                .stream_mouse(tonic::Request::new(outbound))
                .await
                .expect("stream mouse");
            let echoed = resp
                .get_mut()
                .message()
                .await
                .expect("grpc result")
                .expect("echo packet");
            assert_eq!(echoed.data, vec![21, 22, 23, 24, 25, 26, 27, 28]);

            server.abort();
        });
    }

    #[test]
    #[serial]
    fn stream_microphone_returns_internal_error_without_uac_device() {
        let rt = tokio::runtime::Runtime::new().expect("runtime");
        rt.block_on(async {
            let (_dir, handler) = build_handler_for_tests();

            let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("bind");
            let addr = listener.local_addr().expect("addr");
            drop(listener);

            let server = tokio::spawn(async move {
                let _ = tonic::transport::Server::builder()
                    .add_service(RelayServer::new(handler))
                    .serve(addr)
                    .await;
            });

            let channel = connect_with_retry(addr).await;
            let mut cli = RelayClient::new(channel);
            let (_tx, rx) = tokio::sync::mpsc::channel::<AudioPacket>(4);
            let outbound = tokio_stream::wrappers::ReceiverStream::new(rx);
            let err = cli
                .stream_microphone(tonic::Request::new(outbound))
                .await
                .expect_err("missing UAC sink should fail stream setup");
            assert_eq!(err.code(), tonic::Code::Internal);

            server.abort();
        });
    }

    #[test]
    #[serial]
    fn stream_camera_reports_error_or_terminates_cleanly_without_camera_hardware() {
        let rt = tokio::runtime::Runtime::new().expect("runtime");
        rt.block_on(async {
            let (_dir, handler) = build_handler_for_tests();

            let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("bind");
            let addr = listener.local_addr().expect("addr");
            drop(listener);

            let server = tokio::spawn(async move {
                let _ = tonic::transport::Server::builder()
                    .add_service(RelayServer::new(handler))
                    .serve(addr)
                    .await;
            });

            let channel = connect_with_retry(addr).await;
            let mut cli = RelayClient::new(channel);
            let (tx, rx) = tokio::sync::mpsc::channel(4);
            tx.send(VideoPacket {
                id: 2,
                pts: 1,
                data: vec![0, 1, 2, 3],
            })
            .await
            .expect("send camera packet");
            drop(tx);

            let outbound = tokio_stream::wrappers::ReceiverStream::new(rx);
            let result = cli.stream_camera(tonic::Request::new(outbound)).await;
            match result {
                Ok(mut stream) => {
                    let _ = stream.get_mut().message().await;
                }
                Err(err) => {
                    assert!(
                        matches!(
                            err.code(),
                            tonic::Code::Internal | tonic::Code::Unavailable | tonic::Code::Unknown
                        ),
                        "unexpected camera stream error code: {}",
                        err.code()
                    );
                }
            }

            server.abort();
        });
    }

    #[test]
    #[serial]
    fn reset_usb_succeeds_with_fake_cycle_and_override_hid_paths() {
        let dir = tempdir().expect("tempdir");
        let hid_dir = dir.path().join("hid");
        std::fs::create_dir_all(&hid_dir).expect("create hid dir");
        std::fs::write(hid_dir.join("hidg0"), "").expect("create hidg0");
        std::fs::write(hid_dir.join("hidg1"), "").expect("create hidg1");
        build_fake_gadget_tree(dir.path(), "fake-ctrl.usb", "lesavka", "configured");

        with_fake_gadget_roots(&dir.path().join("sys"), &dir.path().join("cfg"), || {
            with_var(
                "LESAVKA_HID_DIR",
                Some(hid_dir.to_string_lossy().to_string()),
                || {
                    let kb = tokio::fs::File::from_std(
                        std::fs::OpenOptions::new()
                            .read(true)
                            .write(true)
                            .open(hid_dir.join("hidg0"))
                            .expect("open hidg0"),
                    );
                    let ms = tokio::fs::File::from_std(
                        std::fs::OpenOptions::new()
                            .read(true)
                            .write(true)
                            .open(hid_dir.join("hidg1"))
                            .expect("open hidg1"),
                    );
                    let handler = Handler {
                        kb: std::sync::Arc::new(tokio::sync::Mutex::new(kb)),
                        ms: std::sync::Arc::new(tokio::sync::Mutex::new(ms)),
                        gadget: UsbGadget::new("lesavka"),
                        did_cycle: std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false)),
                        camera_rt: std::sync::Arc::new(CameraRuntime::new()),
                        capture_power: CapturePowerManager::new(),
                    };
                    let rt = tokio::runtime::Runtime::new().expect("runtime");
                    let reply = rt
                        .block_on(async { handler.reset_usb(tonic::Request::new(Empty {})).await })
                        .expect("reset usb should succeed on fake gadget tree")
                        .into_inner();
                    assert!(reply.ok);
                },
            );
        });
    }

    #[test]
    fn guarded_video_stream_forwards_inner_packets() {
        let rt = tokio::runtime::Runtime::new().expect("runtime");
        rt.block_on(async {
            let lease = CapturePowerManager::new().acquire().await;
            let packet = VideoPacket {
                id: 2,
                pts: 42,
                data: vec![9, 8, 7],
            };
            let mut guarded = GuardedVideoStream {
                inner: stream::iter(vec![Ok(packet.clone())]),
                _lease: lease,
            };

            let observed = guarded
                .next()
                .await
                .expect("guarded stream item")
                .expect("packet");
            assert_eq!(observed.id, packet.id);
            assert_eq!(observed.pts, packet.pts);
            assert_eq!(observed.data, packet.data);
            assert!(guarded.next().await.is_none());
        });
    }
}