// client/src/input/mouse.rs

use evdev::{Device, InputEvent, EventType, RelativeAxisCode};
use tracing::error;

/// Aggregator for a single mouse device
pub struct MouseAggregator {
    dev: Device,
    tx: Sender<HidReport>,
    buttons: u8,
    dx: i8,
    dy: i8,
    wheel: i8,
}

impl MouseAggregator {
    pub fn new(dev: Device) -> Self {
        Self {
            dev,
            dx: 0,
            dy: 0,
        }
    }

    pub fn process_events(&mut self) {
        let events_vec: Vec<InputEvent> = match self.dev.fetch_events() {
            Ok(it) => it.collect(),
            Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {
                return;
            }
            Err(e) => {
                error!("Mouse device read error: {e}");
                return;
            }
        };

        for ev in events_vec {
            self.handle_event(ev);
        }
    }

    fn handle_event(&mut self, ev: InputEvent) {
        match ev.event_type() {
            EventType::RELATIVE => { /* fill dx/dy/wheel as i8 */ }
            EventType::KEY => { // buttons are REPORTED as KEYS (BTN_LEFT…)
                let pressed = ev.value() != 0;
                match ev.code() {
                    c if c == KeyCode::BTN_LEFT.0  => self.set_btn(0, pressed),
                    c if c == KeyCode::BTN_RIGHT.0 => self.set_btn(1, pressed),
                    c if c == KeyCode::BTN_MIDDLE.0=> self.set_btn(2, pressed),
                    _ => {}
                }
            }
            _ => {}
        }

        // whenever we changed something, emit:
        let rep = [self.buttons, self.dx as u8, self.dy as u8, self.wheel as u8];
        let _ = self.tx.try_send(HidReport {
            kind: Some(navka_common::navka::hid_report::Kind::MouseReport(rep.to_vec())),
        });
        // reset deltas so we send *relative* movement
        self.dx = 0; self.dy = 0; self.wheel = 0;
    }

}