//! Extra coverage for `lesavka-uvc` control/error branches.
//!
//! Scope: keep additive branch tests in a separate file so each testing module
//! remains under the 500 LOC contract.
//! Targets: `server/src/bin/lesavka-uvc.rs`.
//! Why: preserve expanded UVC branch coverage while satisfying test module contracts.

mod uvc_binary_extra {
    #![allow(warnings)]
    #![allow(clippy::all)]
    #![allow(dead_code)]
    #![allow(unused_imports)]
    #![allow(unused_variables)]

    include!(env!("LESAVKA_SERVER_UVC_BIN_SRC"));

    use serial_test::serial;
    use std::fs;
    use std::path::PathBuf;
    use temp_env::with_var;
    use tempfile::NamedTempFile;

    fn sample_cfg() -> UvcConfig {
        UvcConfig {
            width: 1280,
            height: 720,
            fps: 25,
            interval: 400_000,
            max_packet: 1024,
            frame_size: 1_843_200,
        }
    }

    fn sample_interfaces() -> UvcInterfaces {
        UvcInterfaces {
            control: UVC_STRING_CONTROL_IDX,
            streaming: UVC_STRING_STREAMING_IDX,
        }
    }

    #[test]
    fn handle_setup_stalls_non_streaming_set_cur_and_non_in_requests() {
        let interfaces = sample_interfaces();
        let mut state = UvcState::new(sample_cfg());
        let mut pending = None;

        let set_cur_other_iface = UsbCtrlRequest {
            b_request_type: 0x00,
            b_request: UVC_SET_CUR,
            w_value: (0xFEu16) << 8,
            w_index: 0x00FF,
            w_length: 8,
        };
        handle_setup(
            -1,
            0,
            &mut state,
            &mut pending,
            interfaces,
            set_cur_other_iface,
            true,
        );
        assert!(pending.is_none());

        let non_in_non_set_cur = UsbCtrlRequest {
            b_request_type: 0x00,
            b_request: UVC_GET_CUR,
            w_value: (UVC_VS_PROBE_CONTROL as u16) << 8,
            w_index: interfaces.streaming as u16,
            w_length: 8,
        };
        handle_setup(
            -1,
            0,
            &mut state,
            &mut pending,
            interfaces,
            non_in_non_set_cur,
            true,
        );
        assert!(pending.is_none());
    }

    #[test]
    fn handle_setup_rejects_oversized_set_cur_payload() {
        let interfaces = sample_interfaces();
        let mut state = UvcState::new(sample_cfg());
        let mut pending = None;
        let oversized = UsbCtrlRequest {
            b_request_type: 0x00,
            b_request: UVC_SET_CUR,
            w_value: (UVC_VS_PROBE_CONTROL as u16) << 8,
            w_index: interfaces.streaming as u16,
            w_length: (UVC_DATA_SIZE as u16).saturating_add(1),
        };
        handle_setup(-1, 0, &mut state, &mut pending, interfaces, oversized, true);
        assert!(pending.is_none());
    }

    #[test]
    fn handle_setup_stalls_unknown_in_selector() {
        let interfaces = sample_interfaces();
        let mut state = UvcState::new(sample_cfg());
        let mut pending = None;
        let req = UsbCtrlRequest {
            b_request_type: USB_DIR_IN,
            b_request: UVC_GET_CUR,
            w_value: (0xFEu16) << 8,
            w_index: interfaces.streaming as u16,
            w_length: 8,
        };
        handle_setup(-1, 0, &mut state, &mut pending, interfaces, req, true);
        assert!(pending.is_none());
    }

    #[test]
    fn handle_data_ignores_missing_pending_and_negative_lengths() {
        let interfaces = sample_interfaces();
        let mut state = UvcState::new(sample_cfg());
        let mut pending = None;
        handle_data(
            -1,
            0,
            &mut state,
            &mut pending,
            interfaces,
            UvcRequestData {
                length: 8,
                data: [0u8; UVC_DATA_SIZE],
            },
            true,
        );

        pending = Some(PendingRequest {
            interface: interfaces.streaming,
            selector: UVC_VS_PROBE_CONTROL,
            expected_len: STREAM_CTRL_SIZE_11,
        });
        handle_data(
            -1,
            0,
            &mut state,
            &mut pending,
            interfaces,
            UvcRequestData {
                length: -1,
                data: [0u8; UVC_DATA_SIZE],
            },
            true,
        );
        assert!(pending.is_none());
    }

    #[test]
    fn handle_data_ignores_non_streaming_pending_requests() {
        let interfaces = sample_interfaces();
        let mut state = UvcState::new(sample_cfg());
        let mut pending = Some(PendingRequest {
            interface: interfaces.control,
            selector: UVC_VS_PROBE_CONTROL,
            expected_len: STREAM_CTRL_SIZE_11,
        });
        let mut payload = [0u8; UVC_DATA_SIZE];
        payload[2] = 1;
        handle_data(
            -1,
            0,
            &mut state,
            &mut pending,
            interfaces,
            UvcRequestData {
                length: STREAM_CTRL_SIZE_11 as i32,
                data: payload,
            },
            true,
        );
        assert!(pending.is_none());
        assert_eq!(state.probe, state.default);
    }

    #[test]
    fn build_in_response_returns_none_for_unknown_selector() {
        let state = UvcState::new(sample_cfg());
        let interfaces = sample_interfaces();
        let response = build_in_response(
            &state,
            interfaces,
            interfaces.streaming,
            0xFE,
            UVC_GET_CUR,
            8,
        );
        assert!(response.is_none());
    }

    #[test]
    fn sanitize_streaming_control_keeps_defaults_for_short_payload() {
        let state = UvcState::new(sample_cfg());
        let short = [0u8; 8];
        let out = sanitize_streaming_control(&short, &state);
        assert_eq!(out, state.default);
    }

    #[test]
    fn io_helpers_return_none_for_empty_or_missing_input() {
        let empty = NamedTempFile::new().expect("tmp");
        fs::write(empty.path(), "\n").expect("write empty");
        assert_eq!(read_u32_first(empty.path().to_str().expect("path")), None);

        let missing = PathBuf::from(format!(
            "/tmp/lesavka-missing-fifo-{}-{}",
            std::process::id(),
            std::thread::current().name().unwrap_or("anon")
        ));
        assert_eq!(read_fifo_min(missing.to_str().expect("missing")), None);
    }

    #[test]
    fn compute_payload_cap_clamps_limit_pct_bounds() {
        with_var("LESAVKA_UVC_MAXPAYLOAD_LIMIT", None::<&str>, || {
            with_var("LESAVKA_UVC_LIMIT_PCT", Some("0"), || {
                let cap = compute_payload_cap(false);
                if let Some(cap) = cap {
                    assert!(cap.pct >= 1);
                }
            });
            with_var("LESAVKA_UVC_LIMIT_PCT", Some("250"), || {
                let cap = compute_payload_cap(true);
                if let Some(cap) = cap {
                    assert!(cap.pct <= 100);
                }
            });
        });
    }

    #[test]
    #[serial]
    fn main_returns_error_for_non_uvc_device_node() {
        with_var("LESAVKA_UVC_DEV", Some("/dev/null"), || {
            with_var("LESAVKA_UVC_BLOCKING", Some("1"), || {
                let result = main();
                assert!(
                    result.is_err(),
                    "non-UVC node should fail during event subscribe"
                );
            });
        });
    }
}