From ec614702564ab83330b5f563099ce5153fd4ce2a Mon Sep 17 00:00:00 2001
From: Stevan Freeborn <stevan.freeborn@gmail.com>
Date: Tue, 28 Jul 2026 09:33:03 -0500
Subject: [PATCH] refactor: implement event handling

---
 src/events.rs | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/events.rs

diff --git a/src/events.rs b/src/events.rs
new file mode 100644
index 0000000..57af44f
--- /dev/null
+++ b/src/events.rs
@@ -0,0 +1,38 @@
+use crossterm::event::{self, Event, KeyCode, KeyModifiers};
+use crate::msg::Message;
+
+pub fn handle_event(event: Event) -> Option<Message> {
+  if let Event::Key(key) = event
+    && key.kind == event::KeyEventKind::Press
+  {
+    match key.code {
+      KeyCode::Char('q') | KeyCode::Char('Q') => Some(Message::Quit),
+      KeyCode::Char('c') if key.modifiers.contains(KeyModifiers::CONTROL) => Some(Message::Quit),
+      KeyCode::Char(' ') => Some(Message::ToggleRunning),
+      KeyCode::Char('s') | KeyCode::Char('S') => Some(Message::ToggleMode),
+      KeyCode::Char('r') | KeyCode::Char('R') => Some(Message::Reset),
+      KeyCode::Char('?') => Some(Message::ToggleHelp),
+      _ => None,
+    }
+  } else {
+    None
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use crossterm::event::KeyEvent;
+
+  #[test]
+  fn handle_event_when_called_maps_key_presses_to_messages() {
+    let key_event = Event::Key(KeyEvent::new(KeyCode::Char(' '), KeyModifiers::NONE));
+    assert_eq!(handle_event(key_event), Some(Message::ToggleRunning));
+
+    let key_event_q = Event::Key(KeyEvent::new(KeyCode::Char('q'), KeyModifiers::NONE));
+    assert_eq!(handle_event(key_event_q), Some(Message::Quit));
+
+    let key_event_unknown = Event::Key(KeyEvent::new(KeyCode::Char('z'), KeyModifiers::NONE));
+    assert_eq!(handle_event(key_event_unknown), None);
+  }
+}