refactor: isolate rendering

src/ui.rs

@@ -0,0 +1,166 @@
+use figlet_rs::Toilet;
+use ratatui::{
+  Frame,
+  layout::{Alignment, Constraint, Direction, Layout, Rect},
+  style::{Color, Style},
+  widgets::{Block, Borders, Clear, Paragraph},
+};
+
+use crate::app::{Termato, TimerMode};
+use crate::audio::AudioVisualizer;
+
+// use unicode blocks for rendering
+// Empty        -> " "
+// 1/8th height -> "▂"
+// 2/8th height -> "▃"
+// 3/8th height -> "▄"
+// 4/8th height -> "▅"
+// 5/8th height -> "▆"
+// 6/8th height -> "▇"
+// Full Height  -> "█"
+pub fn render_visualizer(f: &mut Frame, area: Rect, bar_values: &[u64]) {
+  const BLOCKS: [&str; 8] = ["▂", "▃", "▄", "▅", "▆", "▇", "█", "█"];
+
+  let max_bars = area.width as usize;
+  let line: String = bar_values
+    .iter()
+    .take(max_bars)
+    .map(|&val| {
+      if val == 0 {
+        " "
+      } else {
+        let idx = ((val as f32 / 100.0) * (BLOCKS.len() - 1) as f32)
+          .clamp(0.0, (BLOCKS.len() - 1) as f32) as usize;
+
+        BLOCKS[idx]
+      }
+    })
+    .collect();
+
+  let viz_paragraph = Paragraph::new(line)
+    .style(Style::default().fg(Color::Rgb(200, 184, 224)))
+    .alignment(Alignment::Center);
+
+  f.render_widget(viz_paragraph, area);
+}
+
+pub fn render_app(
+  app: &Termato,
+  f: &mut Frame,
+  font: &Toilet,
+  visualizer: Option<&AudioVisualizer>,
+) {
+  let size = f.area();
+
+  let minutes = app.time_remaining_in_sec / 60;
+  let seconds = app.time_remaining_in_sec % 60;
+  let time_str = format!("{:02}:{:02}", minutes, seconds);
+
+  let time_color = if !app.is_running {
+    Color::Rgb(212, 200, 122)
+  } else {
+    match app.mode {
+      TimerMode::Work => Color::Rgb(212, 115, 115),
+      TimerMode::Break => Color::Rgb(126, 200, 192),
+    }
+  };
+
+  let raw_time_text = if let Some(fig) = font.convert(&time_str) {
+    fig.to_string()
+  } else {
+    time_str
+  };
+
+  let trimmed_time_text = raw_time_text.trim_matches('\n');
+  let text_lines: Vec<&str> = trimmed_time_text.lines().collect();
+  let text_height = text_lines.len() as u16;
+
+  let viz_height = if visualizer.is_some() { 1 } else { 0 };
+  let viz_width = 64;
+
+  let content_height = text_height + viz_height;
+
+  let outer_vertical = Layout::default()
+    .direction(Direction::Vertical)
+    .constraints([
+      Constraint::Min(0),
+      Constraint::Length(content_height),
+      Constraint::Min(0),
+    ])
+    .split(size);
+
+  let inner_vertical = Layout::default()
+    .direction(Direction::Vertical)
+    .constraints([
+      Constraint::Length(text_height),
+      Constraint::Length(viz_height),
+    ])
+    .split(outer_vertical[1]);
+
+  let viz_horizontal = Layout::default()
+    .direction(Direction::Horizontal)
+    .constraints([
+      Constraint::Min(0),
+      Constraint::Length(viz_width.min(size.width)),
+      Constraint::Min(0),
+    ])
+    .split(inner_vertical[1]);
+
+  let timer_paragraph = Paragraph::new(trimmed_time_text)
+    .style(Style::default().fg(time_color))
+    .alignment(Alignment::Center);
+
+  f.render_widget(timer_paragraph, inner_vertical[0]);
+
+  if let Some(viz) = visualizer
+    && let Ok(bar_data) = viz.bar_data.lock()
+  {
+    render_visualizer(f, viz_horizontal[1], &bar_data);
+  }
+
+  if app.show_help {
+    let popup_width = 44;
+    let popup_height = 7;
+
+    if size.width >= popup_width && size.height >= popup_height {
+      let popup_vertical = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+          Constraint::Length((size.height.saturating_sub(popup_height)) / 2),
+          Constraint::Length(popup_height),
+          Constraint::Min(1),
+        ])
+        .split(size);
+
+      let popup_horizontal = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([
+          Constraint::Length((size.width.saturating_sub(popup_width)) / 2),
+          Constraint::Length(popup_width),
+          Constraint::Min(1),
+        ])
+        .split(popup_vertical[1]);
+
+      let popup_area = popup_horizontal[1];
+
+      let help_block = Block::default()
+        .title(" Controls ")
+        .borders(Borders::ALL)
+        .border_style(Style::default().fg(Color::Rgb(58, 62, 70)));
+
+      let help_content = Paragraph::new(
+        "[Space] Pause / Resume\n\
+         [S]     Switch Mode\n\
+         [R]     Reset Timer\n\
+         [?]     Toggle Help\n\
+         [Q]     Quit",
+      )
+      .block(help_block)
+      .style(Style::default().fg(Color::Rgb(224, 228, 232)))
+      .alignment(Alignment::Left);
+
+      f.render_widget(Clear, popup_area);
+      f.render_widget(help_content, popup_area);
+    }
+  }
+}