//! Extra include-based coverage for input aggregator edge cases.
//!
//! Scope: keep additional quick-toggle regression checks in a separate file so
//! each testing module stays under the 500 LOC contract.
//! Targets: `client/src/input/inputs.rs`.
//! Why: quick swap-key taps can otherwise disappear inside one poll cycle and
//! make local/remote handoff feel flaky in the live launcher path.

mod layout {
    pub use lesavka_client::layout::*;
}

mod keyboard {
    pub use lesavka_client::input::keyboard::*;
}

mod mouse {
    pub use lesavka_client::input::mouse::*;
}

#[allow(warnings)]
mod inputs_contract_extra {
    include!(env!("LESAVKA_CLIENT_INPUTS_SRC"));

    use evdev::AttributeSet;
    use evdev::uinput::VirtualDevice;
    use serial_test::serial;
    use std::thread;

    fn open_virtual_device(vdev: &mut VirtualDevice) -> Option<evdev::Device> {
        for _ in 0..40 {
            if let Ok(mut nodes) = vdev.enumerate_dev_nodes_blocking() {
                if let Some(Ok(path)) = nodes.next() {
                    if let Ok(dev) = evdev::Device::open(path) {
                        let _ = dev.set_nonblocking(true);
                        return Some(dev);
                    }
                }
            }
            thread::sleep(std::time::Duration::from_millis(10));
        }
        None
    }

    fn build_keyboard_pair_with_keys(
        name: &str,
        keycodes: &[evdev::KeyCode],
    ) -> Option<(VirtualDevice, evdev::Device)> {
        let mut keys = AttributeSet::<evdev::KeyCode>::new();
        for keycode in keycodes {
            keys.insert(*keycode);
        }

        let mut vdev = VirtualDevice::builder()
            .ok()?
            .name(name)
            .with_keys(&keys)
            .ok()?
            .build()
            .ok()?;

        let dev = open_virtual_device(&mut vdev)?;
        Some((vdev, dev))
    }

    fn build_keyboard_pair(name: &str) -> Option<(VirtualDevice, evdev::Device)> {
        build_keyboard_pair_with_keys(name, &[evdev::KeyCode::KEY_A, evdev::KeyCode::KEY_ENTER])
    }

    fn build_mouse_pair(name: &str) -> Option<(VirtualDevice, evdev::Device)> {
        let mut keys = AttributeSet::<evdev::KeyCode>::new();
        keys.insert(evdev::KeyCode::BTN_LEFT);
        let mut rel = AttributeSet::<evdev::RelativeAxisCode>::new();
        rel.insert(evdev::RelativeAxisCode::REL_X);
        rel.insert(evdev::RelativeAxisCode::REL_Y);

        let mut vdev = VirtualDevice::builder()
            .ok()?
            .name(name)
            .with_keys(&keys)
            .ok()?
            .with_relative_axes(&rel)
            .ok()?
            .build()
            .ok()?;

        let dev = open_virtual_device(&mut vdev)?;
        Some((vdev, dev))
    }

    fn new_aggregator_with_capture(capture_remote_boot: bool) -> InputAggregator {
        let (kbd_tx, _) = tokio::sync::broadcast::channel(16);
        let (mou_tx, _) = tokio::sync::broadcast::channel(16);
        InputAggregator::new_with_capture_mode(false, kbd_tx, mou_tx, None, capture_remote_boot)
    }

    #[test]
    #[cfg(coverage)]
    #[serial]
    fn init_honors_device_selection_mismatches() {
        let Some((_kbd_vdev, _kbd_dev)) = build_keyboard_pair("lesavka-input-init-skip-kbd") else {
            return;
        };
        let Some((_mouse_vdev, _mouse_dev)) = build_mouse_pair("lesavka-input-init-skip-mouse")
        else {
            return;
        };

        temp_env::with_vars(
            [
                ("LESAVKA_KEYBOARD_DEVICE", Some("/dev/input/does-not-match")),
                ("LESAVKA_MOUSE_DEVICE", Some("/dev/input/does-not-match")),
            ],
            || {
                let mut agg = new_aggregator_with_capture(true);
                agg.init().expect("init should tolerate skipped devices");
            },
        );
    }

    #[test]
    #[cfg(coverage)]
    #[serial]
    fn init_stages_devices_ungrabbed_when_session_starts_local() {
        let Some((_kbd_vdev, _kbd_dev)) = build_keyboard_pair("lesavka-input-init-local-kbd")
        else {
            return;
        };
        let Some((_mouse_vdev, _mouse_dev)) = build_mouse_pair("lesavka-input-init-local-mouse")
        else {
            return;
        };

        temp_env::with_vars(
            [
                ("LESAVKA_KEYBOARD_DEVICE", None::<&str>),
                ("LESAVKA_MOUSE_DEVICE", None::<&str>),
            ],
            || {
                let mut agg = new_aggregator_with_capture(false);
                agg.init().expect("init should stage local devices");
            },
        );
    }

    #[test]
    #[serial]
    fn quick_toggle_detects_tap_when_press_and_release_land_in_same_poll_cycle() {
        let Some((mut vdev, dev)) = build_keyboard_pair("lesavka-input-quick-toggle-tap") else {
            return;
        };

        let (kbd_tx, _) = tokio::sync::broadcast::channel(16);
        let (agg_kbd_tx, _) = tokio::sync::broadcast::channel(16);
        let (agg_mou_tx, _) = tokio::sync::broadcast::channel(16);
        let mut keyboard = KeyboardAggregator::new(dev, false, kbd_tx, None);

        vdev.emit(&[
            evdev::InputEvent::new(evdev::EventType::KEY.0, evdev::KeyCode::KEY_A.0, 1),
            evdev::InputEvent::new(evdev::EventType::KEY.0, evdev::KeyCode::KEY_A.0, 0),
        ])
        .expect("emit quick-toggle tap");
        thread::sleep(std::time::Duration::from_millis(20));
        keyboard.process_events();

        let mut agg = InputAggregator::new(false, agg_kbd_tx, agg_mou_tx, None);
        agg.quick_toggle_key = Some(evdev::KeyCode::KEY_A);
        agg.keyboards.push(keyboard);

        assert!(
            agg.quick_toggle_active(),
            "quick-toggle should fire even when a tap starts and ends inside one poll batch"
        );
        assert!(
            !agg.quick_toggle_active(),
            "tap activation should be consumed after one observation"
        );
    }

    #[tokio::test(flavor = "current_thread")]
    #[cfg(coverage)]
    async fn run_keeps_pending_release_armed_until_tracked_key_is_released() {
        let Some((mut vdev, dev)) =
            build_keyboard_pair_with_keys("lesavka-run-held-key", &[evdev::KeyCode::KEY_A])
        else {
            return;
        };

        let (kbd_tx, _) = tokio::sync::broadcast::channel(16);
        let (mou_tx, _) = tokio::sync::broadcast::channel(16);
        let mut keyboard = KeyboardAggregator::new(dev, false, kbd_tx.clone(), None);
        vdev.emit(&[evdev::InputEvent::new(
            evdev::EventType::KEY.0,
            evdev::KeyCode::KEY_A.0,
            1,
        )])
        .expect("emit held key");
        thread::sleep(std::time::Duration::from_millis(25));
        keyboard.process_events();

        let mut agg = InputAggregator::new(false, kbd_tx, mou_tx, None);
        agg.pending_release = true;
        agg.pending_keys.insert(evdev::KeyCode::KEY_A);
        agg.keyboards.push(keyboard);

        let result = tokio::time::timeout(std::time::Duration::from_millis(40), agg.run()).await;
        assert!(result.is_err(), "held key should keep the run loop active");
        assert!(agg.pending_release);
    }

    #[tokio::test(flavor = "current_thread")]
    #[cfg(coverage)]
    async fn run_finishes_pending_release_after_tracked_key_disappears() {
        let (kbd_tx, _) = tokio::sync::broadcast::channel(16);
        let (mou_tx, _) = tokio::sync::broadcast::channel(16);
        let mut agg = InputAggregator::new(false, kbd_tx, mou_tx, None);
        agg.pending_release = true;
        agg.pending_keys.insert(evdev::KeyCode::KEY_A);

        let result = tokio::time::timeout(std::time::Duration::from_millis(40), agg.run()).await;
        assert!(
            result.is_err(),
            "run loop should continue after releasing locally"
        );
        assert!(agg.released);
        assert!(!agg.pending_release);
    }

    #[test]
    #[serial]
    fn process_keyboard_updates_merges_modifier_and_key_across_keyboards() {
        let Some((mut shift_vdev, shift_dev)) = build_keyboard_pair_with_keys(
            "lesavka-input-merge-shift",
            &[evdev::KeyCode::KEY_LEFTSHIFT],
        ) else {
            return;
        };
        let Some((mut a_vdev, a_dev)) =
            build_keyboard_pair_with_keys("lesavka-input-merge-a", &[evdev::KeyCode::KEY_A])
        else {
            return;
        };

        let (kbd_tx, mut rx) = tokio::sync::broadcast::channel(16);
        let (mou_tx, _) = tokio::sync::broadcast::channel(16);
        let shift_keyboard = KeyboardAggregator::new(shift_dev, false, kbd_tx.clone(), None);
        let a_keyboard = KeyboardAggregator::new(a_dev, false, kbd_tx.clone(), None);

        let mut agg = InputAggregator::new(false, kbd_tx, mou_tx, None);
        agg.keyboards.push(shift_keyboard);
        agg.keyboards.push(a_keyboard);

        shift_vdev
            .emit(&[evdev::InputEvent::new(
                evdev::EventType::KEY.0,
                evdev::KeyCode::KEY_LEFTSHIFT.0,
                1,
            )])
            .expect("emit shift");
        a_vdev
            .emit(&[evdev::InputEvent::new(
                evdev::EventType::KEY.0,
                evdev::KeyCode::KEY_A.0,
                1,
            )])
            .expect("emit a");
        thread::sleep(std::time::Duration::from_millis(25));

        temp_env::with_var("LESAVKA_LIVE_MODIFIER_DELAY_MS", Some("0"), || {
            agg.process_keyboard_updates();
        });

        let reports: Vec<Vec<u8>> =
            std::iter::from_fn(|| rx.try_recv().ok().map(|pkt| pkt.data)).collect();
        assert!(
            reports.contains(&vec![0x02, 0, 0x04, 0, 0, 0, 0, 0]),
            "expected merged shift+A report, got {reports:?}"
        );
    }

    #[test]
    #[serial]
    fn process_keyboard_updates_keeps_quick_shift_chord_when_full_tap_lands_in_one_poll_cycle() {
        let Some((mut vdev, dev)) = build_keyboard_pair_with_keys(
            "lesavka-input-shift-batch",
            &[evdev::KeyCode::KEY_LEFTSHIFT, evdev::KeyCode::KEY_A],
        ) else {
            return;
        };

        let (kbd_tx, mut rx) = tokio::sync::broadcast::channel(32);
        let (mou_tx, _) = tokio::sync::broadcast::channel(16);
        let keyboard = KeyboardAggregator::new(dev, false, kbd_tx.clone(), None);

        let mut agg = InputAggregator::new(false, kbd_tx, mou_tx, None);
        agg.keyboards.push(keyboard);

        vdev.emit(&[
            evdev::InputEvent::new(evdev::EventType::KEY.0, evdev::KeyCode::KEY_LEFTSHIFT.0, 1),
            evdev::InputEvent::new(evdev::EventType::KEY.0, evdev::KeyCode::KEY_A.0, 1),
            evdev::InputEvent::new(evdev::EventType::KEY.0, evdev::KeyCode::KEY_A.0, 0),
            evdev::InputEvent::new(evdev::EventType::KEY.0, evdev::KeyCode::KEY_LEFTSHIFT.0, 0),
        ])
        .expect("emit quick shifted tap");
        thread::sleep(std::time::Duration::from_millis(25));

        temp_env::with_var("LESAVKA_LIVE_MODIFIER_DELAY_MS", Some("0"), || {
            agg.process_keyboard_updates();
        });

        let reports: Vec<Vec<u8>> =
            std::iter::from_fn(|| rx.try_recv().ok().map(|pkt| pkt.data)).collect();
        assert!(
            reports.contains(&vec![0x02, 0, 0x04, 0, 0, 0, 0, 0]),
            "expected shifted A report from one-batch chord, got {reports:?}"
        );
        assert!(
            reports.contains(&vec![0; 8]),
            "expected final empty report after one-batch chord, got {reports:?}"
        );
    }

    #[test]
    #[serial]
    fn process_keyboard_updates_keeps_overlapping_plain_keys_from_sticking_across_keyboards() {
        let Some((mut a_vdev, a_dev)) =
            build_keyboard_pair_with_keys("lesavka-input-merge-a-only", &[evdev::KeyCode::KEY_A])
        else {
            return;
        };
        let Some((mut s_vdev, s_dev)) =
            build_keyboard_pair_with_keys("lesavka-input-merge-s-only", &[evdev::KeyCode::KEY_S])
        else {
            return;
        };

        let (kbd_tx, mut rx) = tokio::sync::broadcast::channel(32);
        let (mou_tx, _) = tokio::sync::broadcast::channel(16);
        let a_keyboard = KeyboardAggregator::new(a_dev, false, kbd_tx.clone(), None);
        let s_keyboard = KeyboardAggregator::new(s_dev, false, kbd_tx.clone(), None);

        let mut agg = InputAggregator::new(false, kbd_tx, mou_tx, None);
        agg.keyboards.push(a_keyboard);
        agg.keyboards.push(s_keyboard);

        a_vdev
            .emit(&[evdev::InputEvent::new(
                evdev::EventType::KEY.0,
                evdev::KeyCode::KEY_A.0,
                1,
            )])
            .expect("emit a down");
        s_vdev
            .emit(&[evdev::InputEvent::new(
                evdev::EventType::KEY.0,
                evdev::KeyCode::KEY_S.0,
                1,
            )])
            .expect("emit s down");
        thread::sleep(std::time::Duration::from_millis(25));
        agg.process_keyboard_updates();

        a_vdev
            .emit(&[evdev::InputEvent::new(
                evdev::EventType::KEY.0,
                evdev::KeyCode::KEY_A.0,
                0,
            )])
            .expect("emit a up");
        s_vdev
            .emit(&[evdev::InputEvent::new(
                evdev::EventType::KEY.0,
                evdev::KeyCode::KEY_S.0,
                0,
            )])
            .expect("emit s up");
        thread::sleep(std::time::Duration::from_millis(25));
        agg.process_keyboard_updates();

        let reports: Vec<Vec<u8>> =
            std::iter::from_fn(|| rx.try_recv().ok().map(|pkt| pkt.data)).collect();
        assert!(
            reports.contains(&vec![0, 0, 0x04, 0, 0, 0, 0, 0]),
            "expected A-down report, got {reports:?}"
        );
        assert!(
            reports.iter().any(|pkt| {
                let keys = &pkt[2..8];
                keys.contains(&0x04) && keys.contains(&0x16)
            }),
            "expected merged A+S overlap report, got {reports:?}"
        );
        assert!(
            reports.contains(&vec![0, 0, 0x16, 0, 0, 0, 0, 0]),
            "expected lone S report after A release, got {reports:?}"
        );
        assert!(
            reports.contains(&vec![0; 8]),
            "expected final empty report after both releases, got {reports:?}"
        );
    }
}