feat: add basic ratatui event loop and print time to screen

src/main.rs

@@ -1,6 +1,26 @@
+use std::{
+  io::{self, stdout},
+  sync::mpsc,
+  thread,
+  time::Duration,
+};
+
+use crossterm::{
+  ExecutableCommand,
+  event::{self, Event, KeyCode, KeyModifiers},
+  terminal::{EnterAlternateScreen, LeaveAlternateScreen, disable_raw_mode, enable_raw_mode},
+};
+use ratatui::{
+  Terminal,
+  backend::CrosstermBackend,
+  layout::Alignment,
+  style::{Color, Style},
+  widgets::Paragraph,
+};
+
 const SECONDS_PER_MIN: i64 = 60;
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Clone)]
 enum TimerState {
   Work,
   Break,
@@ -30,6 +50,17 @@ impl Termato {
     }
   }
 
+  fn toggle_running(&mut self) {
+    if self.is_running {
+      self.prior_state = self.state.clone();
+      self.state = TimerState::Paused;
+      self.is_running = false;
+    } else {
+      self.state = self.prior_state.clone();
+      self.is_running = true;
+    }
+  }
+
   fn toggle_mode(&mut self) {
     let is_on_break = self.state == TimerState::Break
       || (self.state == TimerState::Paused && self.prior_state == TimerState::Break);
@@ -58,17 +89,58 @@ impl Termato {
   }
 }
 
-fn main() {
-    let mut termato = Termato::new(1, 1);
+fn main() -> Result<(), io::Error> {
+  enable_raw_mode()?;
+  stdout().execute(EnterAlternateScreen)?;
+  let backend = CrosstermBackend::new(stdout());
+  let mut terminal = Terminal::new(backend)?;
 
+  let mut termato = Termato::new(1, 1);
+
+  let (tx, rx) = mpsc::channel();
+  thread::spawn(move || {
     loop {
-        termato.is_running = true;
-
-        termato.tick();
-
-        println!("Time remaining: {}", termato.time_remaining_in_sec);
-        println!("State: {:?}", termato.state);
+      thread::sleep(Duration::from_secs(1));
+      if tx.send(()).is_err() {
+        break;
+      }
     }
+  });
+
+  loop {
+    terminal.draw(|f| {
+      let size = f.area();
+      let minutes = termato.time_remaining_in_sec / SECONDS_PER_MIN;
+      let seconds = termato.time_remaining_in_sec % SECONDS_PER_MIN;
+      let time_str = format!("{:02}:{:02}", minutes, seconds);
+
+      let paragraph = Paragraph::new(time_str)
+        .style(Style::default().fg(Color::White))
+        .alignment(Alignment::Center);
+
+      f.render_widget(paragraph, size);
+    })?;
+
+    if event::poll(Duration::from_millis(100))?
+      && let Event::Key(key) = event::read()?
+      && key.kind == event::KeyEventKind::Press
+    {
+      match key.code {
+        KeyCode::Char('q') | KeyCode::Char('Q') => break,
+        KeyCode::Char('c') if key.modifiers.contains(KeyModifiers::CONTROL) => break,
+        KeyCode::Char(' ') => termato.toggle_running(),
+        _ => {}
+      }
+    }
+
+    if rx.try_recv().is_ok() {
+      termato.tick();
+    }
+  }
+
+  disable_raw_mode()?;
+  stdout().execute(LeaveAlternateScreen)?;
+  Ok(())
 }
 
 #[cfg(test)]
@@ -160,4 +232,27 @@ mod tests {
     assert_eq!(termato.duration_in_secs, 120);
     assert_eq!(termato.time_remaining_in_sec, 120);
   }
+
+  #[test]
+  fn termato_toggle_running_when_called_and_already_running_it_should_pause() {
+    let mut termato = Termato::new(1, 1);
+    termato.is_running = true;
+
+    termato.toggle_running();
+
+    assert_eq!(termato.state, TimerState::Paused);
+    assert_eq!(termato.prior_state, TimerState::Work);
+    assert!(!termato.is_running)
+  }
+
+  #[test]
+  fn termato_toggle_running_when_called_and_already_paused_it_should_run() {
+    let mut termato = Termato::new(1, 1);
+
+    termato.toggle_running();
+
+    assert_eq!(termato.state, TimerState::Work);
+    assert_eq!(termato.prior_state, TimerState::Work);
+    assert!(termato.is_running)
+  }
 }