recursive-agent 0.6.0

//! Bottom status-bar renderer.
//!
//! The status bar is the dense one-liner that summarises the agent's
//! current connection, model, token usage, cost, turn counter and
//! per-turn elapsed time. It is rendered below the transcript on the
//! chat screen.
//!
//! Format (segments separated by ` │ `):
//!
//! ```text
//!  local │ deepseek-chat │ ↑1.2k ↓342  $0.0024 │ turn 3 │ ⏱ 2.3s
//! ```
//!
//! Cost is omitted when the model has no pricing entry in `providers.toml`;
//! elapsed time is shown only while a turn is running.

use ratatui::prelude::*;
use ratatui::widgets::Paragraph;

use crate::tui::app::App;

/// Build the styled status-bar paragraph for the given [`App`].
pub fn render(frame: &mut Frame, area: Rect, app: &App) {
    let line = build_line(app);
    let paragraph =
        Paragraph::new(line).style(Style::default().fg(Color::White).bg(Color::DarkGray));
    frame.render_widget(paragraph, area);
}

/// Public for tests — produces the styled `Line` without rendering.
pub fn build_line(app: &App) -> Line<'static> {
    let mut spans: Vec<Span<'static>> = Vec::new();

    // [connection]
    spans.push(Span::raw(" "));
    spans.push(Span::styled(
        "local".to_string(),
        Style::default()
            .fg(Color::Green)
            .bg(Color::DarkGray)
            .add_modifier(Modifier::BOLD),
    ));

    // [model]
    spans.push(separator());
    spans.push(Span::styled(
        app.model_name.clone(),
        Style::default().fg(Color::Cyan).bg(Color::DarkGray),
    ));

    // [tokens + cost]
    spans.push(separator());
    spans.push(Span::styled(
        format!(
            "↑{} ↓{}",
            human_count(app.usage.total_input),
            human_count(app.usage.total_output),
        ),
        Style::default().fg(Color::White).bg(Color::DarkGray),
    ));
    if let Some(cost) = crate::tui::app::estimate_cost(
        &app.model_name,
        app.usage.total_input,
        app.usage.total_output,
    ) {
        spans.push(Span::raw("  "));
        spans.push(Span::styled(
            format!("${cost:.4}"),
            Style::default().fg(Color::Yellow).bg(Color::DarkGray),
        ));
    }

    // [turn]
    spans.push(separator());
    spans.push(Span::styled(
        format!("turn {}", app.turn_count),
        Style::default().fg(Color::White).bg(Color::DarkGray),
    ));

    // [plan mode indicators]
    if app.plan_awaiting_approval {
        spans.push(separator());
        spans.push(Span::styled(
            "plan: y/n".to_string(),
            Style::default()
                .fg(Color::Black)
                .bg(Color::Yellow)
                .add_modifier(Modifier::BOLD),
        ));
    } else if app.planning_mode_on {
        spans.push(separator());
        spans.push(Span::styled(
            "plan-first".to_string(),
            Style::default().fg(Color::Yellow).bg(Color::DarkGray),
        ));
    }

    // [elapsed] — only while turn is running
    if let Some(started) = app.turn.started_at {
        let elapsed = started.elapsed().as_secs_f64();
        spans.push(separator());
        spans.push(Span::styled(
            format!("⏱ {:.1}s", elapsed),
            Style::default().fg(Color::Magenta).bg(Color::DarkGray),
        ));
    }

    Line::from(spans)
}

fn separator() -> Span<'static> {
    Span::styled(
        " │ ".to_string(),
        Style::default().fg(Color::DarkGray).bg(Color::DarkGray),
    )
}

/// Format an integer compactly: 1234 → "1.2k", 1_500_000 → "1.5M".
fn human_count(n: u64) -> String {
    if n < 1000 {
        n.to_string()
    } else if n < 1_000_000 {
        format!("{:.1}k", n as f64 / 1000.0)
    } else {
        format!("{:.1}M", n as f64 / 1_000_000.0)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn line_text(line: &Line) -> String {
        line.spans.iter().map(|s| s.content.as_ref()).collect()
    }

    #[test]
    fn human_count_formats_thresholds() {
        assert_eq!(human_count(0), "0");
        assert_eq!(human_count(999), "999");
        assert_eq!(human_count(1234), "1.2k");
        assert_eq!(human_count(1_500_000), "1.5M");
    }

    #[test]
    fn status_bar_includes_model_and_tokens() {
        let mut app = App::new();
        app.model_name = "deepseek-chat".to_string();
        app.usage.total_input = 1234;
        app.usage.total_output = 342;
        let line = build_line(&app);
        let text = line_text(&line);
        assert!(text.contains("local"));
        assert!(text.contains("deepseek-chat"));
        assert!(text.contains("↑1.2k"));
        assert!(text.contains("↓342"));
        assert!(text.contains("turn"));
    }

    #[test]
    fn status_bar_includes_cost_for_known_model() {
        let mut app = App::new();
        app.model_name = "gpt-4o-mini".to_string();
        app.usage.total_input = 1000;
        app.usage.total_output = 1000;
        let text = line_text(&build_line(&app));
        assert!(text.contains("$"));
    }

    #[test]
    fn status_bar_omits_cost_for_unknown_model() {
        let mut app = App::new();
        app.model_name = "totally-bogus-model".to_string();
        app.usage.total_input = 1000;
        app.usage.total_output = 1000;
        let text = line_text(&build_line(&app));
        assert!(!text.contains("$"));
    }

    #[test]
    fn status_bar_shows_elapsed_only_when_turn_running() {
        let mut app = App::new();
        let no_turn = line_text(&build_line(&app));
        assert!(!no_turn.contains("⏱"));
        app.turn.start();
        let with_turn = line_text(&build_line(&app));
        assert!(with_turn.contains("⏱"));
    }

    #[test]
    fn status_bar_shows_plan_awaiting_indicator() {
        let mut app = App::new();
        let no_plan = line_text(&build_line(&app));
        assert!(!no_plan.contains("plan:"));
        app.plan_awaiting_approval = true;
        let with_plan = line_text(&build_line(&app));
        assert!(with_plan.contains("plan: y/n"));
    }

    #[test]
    fn status_bar_shows_plan_first_mode() {
        let mut app = App::new();
        let no_mode = line_text(&build_line(&app));
        assert!(!no_mode.contains("plan-first"));
        app.planning_mode_on = true;
        let with_mode = line_text(&build_line(&app));
        assert!(with_mode.contains("plan-first"));
    }
}