bohay 0.2.0

Next-Gen Agents multiplexer
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//! The tab bar: numbered button tabs with overflow scroll arrows and a `+`.

use super::*;

// ── tab bar ─────────────────────────────────────────────────────────────────

/// (tab rects, close rects, left-scroll arrow, right-scroll arrow).
pub(super) type TabHits = (
    Vec<(usize, Rect)>,
    Vec<(usize, Rect)>,
    Option<Rect>,
    Option<Rect>,
);

pub(super) fn draw_tabbar(f: &mut RenderTarget, area: Rect, app: &App, t: &Theme) -> TabHits {
    // Tab bar background = pane background (the sidebar is the lighter one).
    f.render_widget(Block::new().style(Style::new().bg(t.mantle)), area);
    let ws = app.ws();
    let n = ws.tabs.len();
    let active = ws.active_tab;
    let mut tab_rects = Vec::new();
    let mut close_rects = Vec::new();
    let mut prev_rect = None;
    let mut next_rect = None;

    const CELL: u16 = 10; // wider, button-like tabs
    const GAP: u16 = 1;
    const ARROW: u16 = 2;
    let plus_w: u16 = 3;
    let unit = CELL + GAP;
    let left = area.x + 1;
    let right = area.right();
    let total = right.saturating_sub(left);

    // Do all tabs fit without scroll arrows (leaving room for the "+")?
    let fit_plain = ((total + GAP).saturating_sub(plus_w) / unit) as usize;
    let need_scroll = n > fit_plain;
    let avail = if need_scroll {
        total.saturating_sub(plus_w + 2 * ARROW)
    } else {
        total.saturating_sub(plus_w)
    };
    let max_vis = (((avail + GAP) / unit).max(1) as usize).min(n.max(1));
    // Scroll the window so the active tab stays visible.
    let mut scroll = (active + 1).saturating_sub(max_vis);
    scroll = scroll.min(n.saturating_sub(max_vis));

    let mut x = left;
    // Left scroll arrow.
    if need_scroll {
        let style = if scroll > 0 {
            Style::new().fg(t.accent).bold()
        } else {
            Style::new().fg(t.overlay0)
        };
        let r = Rect::new(x, area.y, ARROW, 1);
        f.render_widget(Paragraph::new(Span::styled("‹ ", style)), r);
        prev_rect = Some(r);
        x += ARROW;
    }

    let end = (scroll + max_vis).min(n);
    for i in scroll..end {
        // A git tab is labeled `⎇ git`; pane tabs are numbered.
        let is_git = ws.tabs.get(i).is_some_and(|tb| tb.is_git());
        let title = |w: usize| {
            if is_git {
                format!("{:^w$}", "⎇ git", w = w)
            } else {
                format!("{:^w$}", i + 1, w = w)
            }
        };
        if i == active {
            let label = title((CELL - 2) as usize);
            let style = Style::new().fg(t.crust).bg(t.accent).bold();
            f.render_widget(
                Paragraph::new(Span::styled(label, style)),
                Rect::new(x, area.y, CELL - 2, 1),
            );
            let close = Rect::new(x + CELL - 2, area.y, 2, 1);
            f.render_widget(
                Paragraph::new(Span::styled("✕ ", Style::new().fg(t.crust).bg(t.accent))),
                close,
            );
            close_rects.push((i, close));
        } else {
            let label = title(CELL as usize);
            f.render_widget(
                Paragraph::new(Span::styled(
                    label,
                    // Inactive tab: same as the pane background.
                    Style::new().fg(t.subtext0).bg(t.mantle),
                )),
                Rect::new(x, area.y, CELL, 1),
            );
        }
        tab_rects.push((i, Rect::new(x, area.y, CELL, 1)));
        x += unit;
    }

    // Right scroll arrow.
    if need_scroll {
        let style = if end < n {
            Style::new().fg(t.accent).bold()
        } else {
            Style::new().fg(t.overlay0)
        };
        let r = Rect::new(x, area.y, ARROW, 1);
        f.render_widget(Paragraph::new(Span::styled("› ", style)), r);
        next_rect = Some(r);
        x += ARROW;
    }

    // "+" new-tab button (clickable; index == tab count).
    if x + plus_w <= right {
        let rect = Rect::new(x, area.y, plus_w, 1);
        f.render_widget(
            Paragraph::new(Span::styled(
                " + ",
                Style::new().fg(t.accent).bg(t.surface0).bold(),
            )),
            rect,
        );
        tab_rects.push((n, rect));
    }
    (tab_rects, close_rects, prev_rect, next_rect)
}