/// System event watcher — M1 implementation.
///
/// M0 stub: defines the types and the spawn interface so the rest of the app
/// can wire up event handling now. Actual journald/dmesg reading lands in M1.

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum EventSeverity {
    Info,
    Warn,
    Crit,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SystemEvent {
    pub severity: EventSeverity,
    pub source: String,
    pub message: String,
    pub timestamp: u64,
}

/// Starts the background watcher task.
/// M0: no-op placeholder — returns immediately.
/// M1: spawns a tokio task reading journald + dmesg and emitting events.
pub fn spawn() {
    // TODO(M1): spawn tokio::task reading journald via sd-journal crate
    // TODO(M1): spawn dmesg poller for kernel messages
    // TODO(M1): emit SystemEvent via tauri app_handle.emit()
    log::info!("watcher: stub — no-op until M1");
}